diff options
Diffstat (limited to 'fs/ext4/super.c')
| -rw-r--r-- | fs/ext4/super.c | 5672 |
1 files changed, 5672 insertions, 0 deletions
diff --git a/fs/ext4/super.c b/fs/ext4/super.c new file mode 100644 index 000000000..ca12affdb --- /dev/null +++ b/fs/ext4/super.c @@ -0,0 +1,5672 @@ +/* + * linux/fs/ext4/super.c + * + * Copyright (C) 1992, 1993, 1994, 1995 + * Remy Card (card@masi.ibp.fr) + * Laboratoire MASI - Institut Blaise Pascal + * Universite Pierre et Marie Curie (Paris VI) + * + * from + * + * linux/fs/minix/inode.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Big-endian to little-endian byte-swapping/bitmaps by + * David S. Miller (davem@caip.rutgers.edu), 1995 + */ + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/fs.h> +#include <linux/time.h> +#include <linux/vmalloc.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/blkdev.h> +#include <linux/parser.h> +#include <linux/buffer_head.h> +#include <linux/exportfs.h> +#include <linux/vfs.h> +#include <linux/random.h> +#include <linux/mount.h> +#include <linux/namei.h> +#include <linux/quotaops.h> +#include <linux/seq_file.h> +#include <linux/proc_fs.h> +#include <linux/ctype.h> +#include <linux/log2.h> +#include <linux/crc16.h> +#include <linux/cleancache.h> +#include <asm/uaccess.h> + +#include <linux/kthread.h> +#include <linux/freezer.h> + +#include "ext4.h" +#include "ext4_extents.h" /* Needed for trace points definition */ +#include "ext4_jbd2.h" +#include "xattr.h" +#include "acl.h" +#include "mballoc.h" + +#define CREATE_TRACE_POINTS +#include <trace/events/ext4.h> + +static struct proc_dir_entry *ext4_proc_root; +static struct kset *ext4_kset; +static struct ext4_lazy_init *ext4_li_info; +static struct mutex ext4_li_mtx; +static struct ext4_features *ext4_feat; +static int ext4_mballoc_ready; + +static int ext4_load_journal(struct super_block *, struct ext4_super_block *, + unsigned long journal_devnum); +static int ext4_show_options(struct seq_file *seq, struct dentry *root); +static int ext4_commit_super(struct super_block *sb, int sync); +static void ext4_mark_recovery_complete(struct super_block *sb, + struct ext4_super_block *es); +static void ext4_clear_journal_err(struct super_block *sb, + struct ext4_super_block *es); +static int ext4_sync_fs(struct super_block *sb, int wait); +static int ext4_remount(struct super_block *sb, int *flags, char *data); +static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf); +static int ext4_unfreeze(struct super_block *sb); +static int ext4_freeze(struct super_block *sb); +static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data); +static inline int ext2_feature_set_ok(struct super_block *sb); +static inline int ext3_feature_set_ok(struct super_block *sb); +static int ext4_feature_set_ok(struct super_block *sb, int readonly); +static void ext4_destroy_lazyinit_thread(void); +static void ext4_unregister_li_request(struct super_block *sb); +static void ext4_clear_request_list(void); +static int ext4_reserve_clusters(struct ext4_sb_info *, ext4_fsblk_t); + +#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) +static struct file_system_type ext2_fs_type = { + .owner = THIS_MODULE, + .name = "ext2", + .mount = ext4_mount, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("ext2"); +MODULE_ALIAS("ext2"); +#define IS_EXT2_SB(sb) ((sb)->s_bdev->bd_holder == &ext2_fs_type) +#else +#define IS_EXT2_SB(sb) (0) +#endif + + +#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) +static struct file_system_type ext3_fs_type = { + .owner = THIS_MODULE, + .name = "ext3", + .mount = ext4_mount, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("ext3"); +MODULE_ALIAS("ext3"); +#define IS_EXT3_SB(sb) ((sb)->s_bdev->bd_holder == &ext3_fs_type) +#else +#define IS_EXT3_SB(sb) (0) +#endif + +static int ext4_verify_csum_type(struct super_block *sb, + struct ext4_super_block *es) +{ + if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + return 1; + + return es->s_checksum_type == EXT4_CRC32C_CHKSUM; +} + +static __le32 ext4_superblock_csum(struct super_block *sb, + struct ext4_super_block *es) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + int offset = offsetof(struct ext4_super_block, s_checksum); + __u32 csum; + + csum = ext4_chksum(sbi, ~0, (char *)es, offset); + + return cpu_to_le32(csum); +} + +static int ext4_superblock_csum_verify(struct super_block *sb, + struct ext4_super_block *es) +{ + if (!ext4_has_metadata_csum(sb)) + return 1; + + return es->s_checksum == ext4_superblock_csum(sb, es); +} + +void ext4_superblock_csum_set(struct super_block *sb) +{ + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + if (!ext4_has_metadata_csum(sb)) + return; + + es->s_checksum = ext4_superblock_csum(sb, es); +} + +void *ext4_kvmalloc(size_t size, gfp_t flags) +{ + void *ret; + + ret = kmalloc(size, flags | __GFP_NOWARN); + if (!ret) + ret = __vmalloc(size, flags, PAGE_KERNEL); + return ret; +} + +void *ext4_kvzalloc(size_t size, gfp_t flags) +{ + void *ret; + + ret = kzalloc(size, flags | __GFP_NOWARN); + if (!ret) + ret = __vmalloc(size, flags | __GFP_ZERO, PAGE_KERNEL); + return ret; +} + +ext4_fsblk_t ext4_block_bitmap(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le32_to_cpu(bg->bg_block_bitmap_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (ext4_fsblk_t)le32_to_cpu(bg->bg_block_bitmap_hi) << 32 : 0); +} + +ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le32_to_cpu(bg->bg_inode_bitmap_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0); +} + +ext4_fsblk_t ext4_inode_table(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le32_to_cpu(bg->bg_inode_table_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0); +} + +__u32 ext4_free_group_clusters(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_free_blocks_count_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_free_blocks_count_hi) << 16 : 0); +} + +__u32 ext4_free_inodes_count(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_free_inodes_count_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_free_inodes_count_hi) << 16 : 0); +} + +__u32 ext4_used_dirs_count(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_used_dirs_count_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_used_dirs_count_hi) << 16 : 0); +} + +__u32 ext4_itable_unused_count(struct super_block *sb, + struct ext4_group_desc *bg) +{ + return le16_to_cpu(bg->bg_itable_unused_lo) | + (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ? + (__u32)le16_to_cpu(bg->bg_itable_unused_hi) << 16 : 0); +} + +void ext4_block_bitmap_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk) +{ + bg->bg_block_bitmap_lo = cpu_to_le32((u32)blk); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_block_bitmap_hi = cpu_to_le32(blk >> 32); +} + +void ext4_inode_bitmap_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk) +{ + bg->bg_inode_bitmap_lo = cpu_to_le32((u32)blk); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32); +} + +void ext4_inode_table_set(struct super_block *sb, + struct ext4_group_desc *bg, ext4_fsblk_t blk) +{ + bg->bg_inode_table_lo = cpu_to_le32((u32)blk); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_inode_table_hi = cpu_to_le32(blk >> 32); +} + +void ext4_free_group_clusters_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_free_blocks_count_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_free_blocks_count_hi = cpu_to_le16(count >> 16); +} + +void ext4_free_inodes_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_free_inodes_count_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_free_inodes_count_hi = cpu_to_le16(count >> 16); +} + +void ext4_used_dirs_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_used_dirs_count_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_used_dirs_count_hi = cpu_to_le16(count >> 16); +} + +void ext4_itable_unused_set(struct super_block *sb, + struct ext4_group_desc *bg, __u32 count) +{ + bg->bg_itable_unused_lo = cpu_to_le16((__u16)count); + if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT) + bg->bg_itable_unused_hi = cpu_to_le16(count >> 16); +} + + +static void __save_error_info(struct super_block *sb, const char *func, + unsigned int line) +{ + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; + if (bdev_read_only(sb->s_bdev)) + return; + es->s_state |= cpu_to_le16(EXT4_ERROR_FS); + es->s_last_error_time = cpu_to_le32(get_seconds()); + strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func)); + es->s_last_error_line = cpu_to_le32(line); + if (!es->s_first_error_time) { + es->s_first_error_time = es->s_last_error_time; + strncpy(es->s_first_error_func, func, + sizeof(es->s_first_error_func)); + es->s_first_error_line = cpu_to_le32(line); + es->s_first_error_ino = es->s_last_error_ino; + es->s_first_error_block = es->s_last_error_block; + } + /* + * Start the daily error reporting function if it hasn't been + * started already + */ + if (!es->s_error_count) + mod_timer(&EXT4_SB(sb)->s_err_report, jiffies + 24*60*60*HZ); + le32_add_cpu(&es->s_error_count, 1); +} + +static void save_error_info(struct super_block *sb, const char *func, + unsigned int line) +{ + __save_error_info(sb, func, line); + ext4_commit_super(sb, 1); +} + +static void ext4_journal_commit_callback(journal_t *journal, transaction_t *txn) +{ + struct super_block *sb = journal->j_private; + struct ext4_sb_info *sbi = EXT4_SB(sb); + int error = is_journal_aborted(journal); + struct ext4_journal_cb_entry *jce; + + BUG_ON(txn->t_state == T_FINISHED); + spin_lock(&sbi->s_md_lock); + while (!list_empty(&txn->t_private_list)) { + jce = list_entry(txn->t_private_list.next, + struct ext4_journal_cb_entry, jce_list); + list_del_init(&jce->jce_list); + spin_unlock(&sbi->s_md_lock); + jce->jce_func(sb, jce, error); + spin_lock(&sbi->s_md_lock); + } + spin_unlock(&sbi->s_md_lock); +} + +/* Deal with the reporting of failure conditions on a filesystem such as + * inconsistencies detected or read IO failures. + * + * On ext2, we can store the error state of the filesystem in the + * superblock. That is not possible on ext4, because we may have other + * write ordering constraints on the superblock which prevent us from + * writing it out straight away; and given that the journal is about to + * be aborted, we can't rely on the current, or future, transactions to + * write out the superblock safely. + * + * We'll just use the jbd2_journal_abort() error code to record an error in + * the journal instead. On recovery, the journal will complain about + * that error until we've noted it down and cleared it. + */ + +static void ext4_handle_error(struct super_block *sb) +{ + if (sb->s_flags & MS_RDONLY) + return; + + if (!test_opt(sb, ERRORS_CONT)) { + journal_t *journal = EXT4_SB(sb)->s_journal; + + EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; + if (journal) + jbd2_journal_abort(journal, -EIO); + } + if (test_opt(sb, ERRORS_RO)) { + ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); + /* + * Make sure updated value of ->s_mount_flags will be visible + * before ->s_flags update + */ + smp_wmb(); + sb->s_flags |= MS_RDONLY; + } + if (test_opt(sb, ERRORS_PANIC)) + panic("EXT4-fs (device %s): panic forced after error\n", + sb->s_id); +} + +#define ext4_error_ratelimit(sb) \ + ___ratelimit(&(EXT4_SB(sb)->s_err_ratelimit_state), \ + "EXT4-fs error") + +void __ext4_error(struct super_block *sb, const char *function, + unsigned int line, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (ext4_error_ratelimit(sb)) { + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk(KERN_CRIT + "EXT4-fs error (device %s): %s:%d: comm %s: %pV\n", + sb->s_id, function, line, current->comm, &vaf); + va_end(args); + } + save_error_info(sb, function, line); + ext4_handle_error(sb); +} + +void __ext4_error_inode(struct inode *inode, const char *function, + unsigned int line, ext4_fsblk_t block, + const char *fmt, ...) +{ + va_list args; + struct va_format vaf; + struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es; + + es->s_last_error_ino = cpu_to_le32(inode->i_ino); + es->s_last_error_block = cpu_to_le64(block); + if (ext4_error_ratelimit(inode->i_sb)) { + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + if (block) + printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " + "inode #%lu: block %llu: comm %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + block, current->comm, &vaf); + else + printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: " + "inode #%lu: comm %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + current->comm, &vaf); + va_end(args); + } + save_error_info(inode->i_sb, function, line); + ext4_handle_error(inode->i_sb); +} + +void __ext4_error_file(struct file *file, const char *function, + unsigned int line, ext4_fsblk_t block, + const char *fmt, ...) +{ + va_list args; + struct va_format vaf; + struct ext4_super_block *es; + struct inode *inode = file_inode(file); + char pathname[80], *path; + + es = EXT4_SB(inode->i_sb)->s_es; + es->s_last_error_ino = cpu_to_le32(inode->i_ino); + if (ext4_error_ratelimit(inode->i_sb)) { + path = d_path(&(file->f_path), pathname, sizeof(pathname)); + if (IS_ERR(path)) + path = "(unknown)"; + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + if (block) + printk(KERN_CRIT + "EXT4-fs error (device %s): %s:%d: inode #%lu: " + "block %llu: comm %s: path %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + block, current->comm, path, &vaf); + else + printk(KERN_CRIT + "EXT4-fs error (device %s): %s:%d: inode #%lu: " + "comm %s: path %s: %pV\n", + inode->i_sb->s_id, function, line, inode->i_ino, + current->comm, path, &vaf); + va_end(args); + } + save_error_info(inode->i_sb, function, line); + ext4_handle_error(inode->i_sb); +} + +const char *ext4_decode_error(struct super_block *sb, int errno, + char nbuf[16]) +{ + char *errstr = NULL; + + switch (errno) { + case -EIO: + errstr = "IO failure"; + break; + case -ENOMEM: + errstr = "Out of memory"; + break; + case -EROFS: + if (!sb || (EXT4_SB(sb)->s_journal && + EXT4_SB(sb)->s_journal->j_flags & JBD2_ABORT)) + errstr = "Journal has aborted"; + else + errstr = "Readonly filesystem"; + break; + default: + /* If the caller passed in an extra buffer for unknown + * errors, textualise them now. Else we just return + * NULL. */ + if (nbuf) { + /* Check for truncated error codes... */ + if (snprintf(nbuf, 16, "error %d", -errno) >= 0) + errstr = nbuf; + } + break; + } + + return errstr; +} + +/* __ext4_std_error decodes expected errors from journaling functions + * automatically and invokes the appropriate error response. */ + +void __ext4_std_error(struct super_block *sb, const char *function, + unsigned int line, int errno) +{ + char nbuf[16]; + const char *errstr; + + /* Special case: if the error is EROFS, and we're not already + * inside a transaction, then there's really no point in logging + * an error. */ + if (errno == -EROFS && journal_current_handle() == NULL && + (sb->s_flags & MS_RDONLY)) + return; + + if (ext4_error_ratelimit(sb)) { + errstr = ext4_decode_error(sb, errno, nbuf); + printk(KERN_CRIT "EXT4-fs error (device %s) in %s:%d: %s\n", + sb->s_id, function, line, errstr); + } + + save_error_info(sb, function, line); + ext4_handle_error(sb); +} + +/* + * ext4_abort is a much stronger failure handler than ext4_error. The + * abort function may be used to deal with unrecoverable failures such + * as journal IO errors or ENOMEM at a critical moment in log management. + * + * We unconditionally force the filesystem into an ABORT|READONLY state, + * unless the error response on the fs has been set to panic in which + * case we take the easy way out and panic immediately. + */ + +void __ext4_abort(struct super_block *sb, const char *function, + unsigned int line, const char *fmt, ...) +{ + va_list args; + + save_error_info(sb, function, line); + va_start(args, fmt); + printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: ", sb->s_id, + function, line); + vprintk(fmt, args); + printk("\n"); + va_end(args); + + if ((sb->s_flags & MS_RDONLY) == 0) { + ext4_msg(sb, KERN_CRIT, "Remounting filesystem read-only"); + EXT4_SB(sb)->s_mount_flags |= EXT4_MF_FS_ABORTED; + /* + * Make sure updated value of ->s_mount_flags will be visible + * before ->s_flags update + */ + smp_wmb(); + sb->s_flags |= MS_RDONLY; + if (EXT4_SB(sb)->s_journal) + jbd2_journal_abort(EXT4_SB(sb)->s_journal, -EIO); + save_error_info(sb, function, line); + } + if (test_opt(sb, ERRORS_PANIC)) + panic("EXT4-fs panic from previous error\n"); +} + +void __ext4_msg(struct super_block *sb, + const char *prefix, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (!___ratelimit(&(EXT4_SB(sb)->s_msg_ratelimit_state), "EXT4-fs")) + return; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk("%sEXT4-fs (%s): %pV\n", prefix, sb->s_id, &vaf); + va_end(args); +} + +void __ext4_warning(struct super_block *sb, const char *function, + unsigned int line, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + if (!___ratelimit(&(EXT4_SB(sb)->s_warning_ratelimit_state), + "EXT4-fs warning")) + return; + + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk(KERN_WARNING "EXT4-fs warning (device %s): %s:%d: %pV\n", + sb->s_id, function, line, &vaf); + va_end(args); +} + +void __ext4_grp_locked_error(const char *function, unsigned int line, + struct super_block *sb, ext4_group_t grp, + unsigned long ino, ext4_fsblk_t block, + const char *fmt, ...) +__releases(bitlock) +__acquires(bitlock) +{ + struct va_format vaf; + va_list args; + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + es->s_last_error_ino = cpu_to_le32(ino); + es->s_last_error_block = cpu_to_le64(block); + __save_error_info(sb, function, line); + + if (ext4_error_ratelimit(sb)) { + va_start(args, fmt); + vaf.fmt = fmt; + vaf.va = &args; + printk(KERN_CRIT "EXT4-fs error (device %s): %s:%d: group %u, ", + sb->s_id, function, line, grp); + if (ino) + printk(KERN_CONT "inode %lu: ", ino); + if (block) + printk(KERN_CONT "block %llu:", + (unsigned long long) block); + printk(KERN_CONT "%pV\n", &vaf); + va_end(args); + } + + if (test_opt(sb, ERRORS_CONT)) { + ext4_commit_super(sb, 0); + return; + } + + ext4_unlock_group(sb, grp); + ext4_handle_error(sb); + /* + * We only get here in the ERRORS_RO case; relocking the group + * may be dangerous, but nothing bad will happen since the + * filesystem will have already been marked read/only and the + * journal has been aborted. We return 1 as a hint to callers + * who might what to use the return value from + * ext4_grp_locked_error() to distinguish between the + * ERRORS_CONT and ERRORS_RO case, and perhaps return more + * aggressively from the ext4 function in question, with a + * more appropriate error code. + */ + ext4_lock_group(sb, grp); + return; +} + +void ext4_update_dynamic_rev(struct super_block *sb) +{ + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + if (le32_to_cpu(es->s_rev_level) > EXT4_GOOD_OLD_REV) + return; + + ext4_warning(sb, + "updating to rev %d because of new feature flag, " + "running e2fsck is recommended", + EXT4_DYNAMIC_REV); + + es->s_first_ino = cpu_to_le32(EXT4_GOOD_OLD_FIRST_INO); + es->s_inode_size = cpu_to_le16(EXT4_GOOD_OLD_INODE_SIZE); + es->s_rev_level = cpu_to_le32(EXT4_DYNAMIC_REV); + /* leave es->s_feature_*compat flags alone */ + /* es->s_uuid will be set by e2fsck if empty */ + + /* + * The rest of the superblock fields should be zero, and if not it + * means they are likely already in use, so leave them alone. We + * can leave it up to e2fsck to clean up any inconsistencies there. + */ +} + +/* + * Open the external journal device + */ +static struct block_device *ext4_blkdev_get(dev_t dev, struct super_block *sb) +{ + struct block_device *bdev; + char b[BDEVNAME_SIZE]; + + bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); + if (IS_ERR(bdev)) + goto fail; + return bdev; + +fail: + ext4_msg(sb, KERN_ERR, "failed to open journal device %s: %ld", + __bdevname(dev, b), PTR_ERR(bdev)); + return NULL; +} + +/* + * Release the journal device + */ +static void ext4_blkdev_put(struct block_device *bdev) +{ + blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); +} + +static void ext4_blkdev_remove(struct ext4_sb_info *sbi) +{ + struct block_device *bdev; + bdev = sbi->journal_bdev; + if (bdev) { + ext4_blkdev_put(bdev); + sbi->journal_bdev = NULL; + } +} + +static inline struct inode *orphan_list_entry(struct list_head *l) +{ + return &list_entry(l, struct ext4_inode_info, i_orphan)->vfs_inode; +} + +static void dump_orphan_list(struct super_block *sb, struct ext4_sb_info *sbi) +{ + struct list_head *l; + + ext4_msg(sb, KERN_ERR, "sb orphan head is %d", + le32_to_cpu(sbi->s_es->s_last_orphan)); + + printk(KERN_ERR "sb_info orphan list:\n"); + list_for_each(l, &sbi->s_orphan) { + struct inode *inode = orphan_list_entry(l); + printk(KERN_ERR " " + "inode %s:%lu at %p: mode %o, nlink %d, next %d\n", + inode->i_sb->s_id, inode->i_ino, inode, + inode->i_mode, inode->i_nlink, + NEXT_ORPHAN(inode)); + } +} + +static void ext4_put_super(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + int i, err; + + ext4_unregister_li_request(sb); + dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); + + flush_workqueue(sbi->rsv_conversion_wq); + destroy_workqueue(sbi->rsv_conversion_wq); + + if (sbi->s_journal) { + err = jbd2_journal_destroy(sbi->s_journal); + sbi->s_journal = NULL; + if (err < 0) + ext4_abort(sb, "Couldn't clean up the journal"); + } + + ext4_es_unregister_shrinker(sbi); + del_timer_sync(&sbi->s_err_report); + ext4_release_system_zone(sb); + ext4_mb_release(sb); + ext4_ext_release(sb); + ext4_xattr_put_super(sb); + + if (!(sb->s_flags & MS_RDONLY)) { + EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); + es->s_state = cpu_to_le16(sbi->s_mount_state); + } + if (!(sb->s_flags & MS_RDONLY)) + ext4_commit_super(sb, 1); + + if (sbi->s_proc) { + remove_proc_entry("options", sbi->s_proc); + remove_proc_entry(sb->s_id, ext4_proc_root); + } + kobject_del(&sbi->s_kobj); + + for (i = 0; i < sbi->s_gdb_count; i++) + brelse(sbi->s_group_desc[i]); + kvfree(sbi->s_group_desc); + kvfree(sbi->s_flex_groups); + percpu_counter_destroy(&sbi->s_freeclusters_counter); + percpu_counter_destroy(&sbi->s_freeinodes_counter); + percpu_counter_destroy(&sbi->s_dirs_counter); + percpu_counter_destroy(&sbi->s_dirtyclusters_counter); + brelse(sbi->s_sbh); +#ifdef CONFIG_QUOTA + for (i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(sbi->s_qf_names[i]); +#endif + + /* Debugging code just in case the in-memory inode orphan list + * isn't empty. The on-disk one can be non-empty if we've + * detected an error and taken the fs readonly, but the + * in-memory list had better be clean by this point. */ + if (!list_empty(&sbi->s_orphan)) + dump_orphan_list(sb, sbi); + J_ASSERT(list_empty(&sbi->s_orphan)); + + sync_blockdev(sb->s_bdev); + invalidate_bdev(sb->s_bdev); + if (sbi->journal_bdev && sbi->journal_bdev != sb->s_bdev) { + /* + * Invalidate the journal device's buffers. We don't want them + * floating about in memory - the physical journal device may + * hotswapped, and it breaks the `ro-after' testing code. + */ + sync_blockdev(sbi->journal_bdev); + invalidate_bdev(sbi->journal_bdev); + ext4_blkdev_remove(sbi); + } + if (sbi->s_mb_cache) { + ext4_xattr_destroy_cache(sbi->s_mb_cache); + sbi->s_mb_cache = NULL; + } + if (sbi->s_mmp_tsk) + kthread_stop(sbi->s_mmp_tsk); + sb->s_fs_info = NULL; + /* + * Now that we are completely done shutting down the + * superblock, we need to actually destroy the kobject. + */ + kobject_put(&sbi->s_kobj); + wait_for_completion(&sbi->s_kobj_unregister); + if (sbi->s_chksum_driver) + crypto_free_shash(sbi->s_chksum_driver); + kfree(sbi->s_blockgroup_lock); + kfree(sbi); +} + +static struct kmem_cache *ext4_inode_cachep; + +/* + * Called inside transaction, so use GFP_NOFS + */ +static struct inode *ext4_alloc_inode(struct super_block *sb) +{ + struct ext4_inode_info *ei; + + ei = kmem_cache_alloc(ext4_inode_cachep, GFP_NOFS); + if (!ei) + return NULL; + + ei->vfs_inode.i_version = 1; + spin_lock_init(&ei->i_raw_lock); + INIT_LIST_HEAD(&ei->i_prealloc_list); + spin_lock_init(&ei->i_prealloc_lock); + ext4_es_init_tree(&ei->i_es_tree); + rwlock_init(&ei->i_es_lock); + INIT_LIST_HEAD(&ei->i_es_list); + ei->i_es_all_nr = 0; + ei->i_es_shk_nr = 0; + ei->i_es_shrink_lblk = 0; + ei->i_reserved_data_blocks = 0; + ei->i_reserved_meta_blocks = 0; + ei->i_allocated_meta_blocks = 0; + ei->i_da_metadata_calc_len = 0; + ei->i_da_metadata_calc_last_lblock = 0; + spin_lock_init(&(ei->i_block_reservation_lock)); +#ifdef CONFIG_QUOTA + ei->i_reserved_quota = 0; + memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); +#endif + ei->jinode = NULL; + INIT_LIST_HEAD(&ei->i_rsv_conversion_list); + spin_lock_init(&ei->i_completed_io_lock); + ei->i_sync_tid = 0; + ei->i_datasync_tid = 0; + atomic_set(&ei->i_ioend_count, 0); + atomic_set(&ei->i_unwritten, 0); + INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work); +#ifdef CONFIG_EXT4_FS_ENCRYPTION + ei->i_encryption_key.mode = EXT4_ENCRYPTION_MODE_INVALID; +#endif + + return &ei->vfs_inode; +} + +static int ext4_drop_inode(struct inode *inode) +{ + int drop = generic_drop_inode(inode); + + trace_ext4_drop_inode(inode, drop); + return drop; +} + +static void ext4_i_callback(struct rcu_head *head) +{ + struct inode *inode = container_of(head, struct inode, i_rcu); + kmem_cache_free(ext4_inode_cachep, EXT4_I(inode)); +} + +static void ext4_destroy_inode(struct inode *inode) +{ + if (!list_empty(&(EXT4_I(inode)->i_orphan))) { + ext4_msg(inode->i_sb, KERN_ERR, + "Inode %lu (%p): orphan list check failed!", + inode->i_ino, EXT4_I(inode)); + print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 16, 4, + EXT4_I(inode), sizeof(struct ext4_inode_info), + true); + dump_stack(); + } + call_rcu(&inode->i_rcu, ext4_i_callback); +} + +static void init_once(void *foo) +{ + struct ext4_inode_info *ei = (struct ext4_inode_info *) foo; + + INIT_LIST_HEAD(&ei->i_orphan); + init_rwsem(&ei->xattr_sem); + init_rwsem(&ei->i_data_sem); + inode_init_once(&ei->vfs_inode); +} + +static int __init init_inodecache(void) +{ + ext4_inode_cachep = kmem_cache_create("ext4_inode_cache", + sizeof(struct ext4_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD), + init_once); + if (ext4_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(ext4_inode_cachep); +} + +void ext4_clear_inode(struct inode *inode) +{ + invalidate_inode_buffers(inode); + clear_inode(inode); + dquot_drop(inode); + ext4_discard_preallocations(inode); + ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS); + if (EXT4_I(inode)->jinode) { + jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), + EXT4_I(inode)->jinode); + jbd2_free_inode(EXT4_I(inode)->jinode); + EXT4_I(inode)->jinode = NULL; + } +} + +static struct inode *ext4_nfs_get_inode(struct super_block *sb, + u64 ino, u32 generation) +{ + struct inode *inode; + + if (ino < EXT4_FIRST_INO(sb) && ino != EXT4_ROOT_INO) + return ERR_PTR(-ESTALE); + if (ino > le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count)) + return ERR_PTR(-ESTALE); + + /* iget isn't really right if the inode is currently unallocated!! + * + * ext4_read_inode will return a bad_inode if the inode had been + * deleted, so we should be safe. + * + * Currently we don't know the generation for parent directory, so + * a generation of 0 means "accept any" + */ + inode = ext4_iget_normal(sb, ino); + if (IS_ERR(inode)) + return ERR_CAST(inode); + if (generation && inode->i_generation != generation) { + iput(inode); + return ERR_PTR(-ESTALE); + } + + return inode; +} + +static struct dentry *ext4_fh_to_dentry(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_dentry(sb, fid, fh_len, fh_type, + ext4_nfs_get_inode); +} + +static struct dentry *ext4_fh_to_parent(struct super_block *sb, struct fid *fid, + int fh_len, int fh_type) +{ + return generic_fh_to_parent(sb, fid, fh_len, fh_type, + ext4_nfs_get_inode); +} + +/* + * Try to release metadata pages (indirect blocks, directories) which are + * mapped via the block device. Since these pages could have journal heads + * which would prevent try_to_free_buffers() from freeing them, we must use + * jbd2 layer's try_to_free_buffers() function to release them. + */ +static int bdev_try_to_free_page(struct super_block *sb, struct page *page, + gfp_t wait) +{ + journal_t *journal = EXT4_SB(sb)->s_journal; + + WARN_ON(PageChecked(page)); + if (!page_has_buffers(page)) + return 0; + if (journal) + return jbd2_journal_try_to_free_buffers(journal, page, + wait & ~__GFP_WAIT); + return try_to_free_buffers(page); +} + +#ifdef CONFIG_QUOTA +#define QTYPE2NAME(t) ((t) == USRQUOTA ? "user" : "group") +#define QTYPE2MOPT(on, t) ((t) == USRQUOTA?((on)##USRJQUOTA):((on)##GRPJQUOTA)) + +static int ext4_write_dquot(struct dquot *dquot); +static int ext4_acquire_dquot(struct dquot *dquot); +static int ext4_release_dquot(struct dquot *dquot); +static int ext4_mark_dquot_dirty(struct dquot *dquot); +static int ext4_write_info(struct super_block *sb, int type); +static int ext4_quota_on(struct super_block *sb, int type, int format_id, + struct path *path); +static int ext4_quota_off(struct super_block *sb, int type); +static int ext4_quota_on_mount(struct super_block *sb, int type); +static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off); +static ssize_t ext4_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off); +static int ext4_quota_enable(struct super_block *sb, int type, int format_id, + unsigned int flags); +static int ext4_enable_quotas(struct super_block *sb); + +static struct dquot **ext4_get_dquots(struct inode *inode) +{ + return EXT4_I(inode)->i_dquot; +} + +static const struct dquot_operations ext4_quota_operations = { + .get_reserved_space = ext4_get_reserved_space, + .write_dquot = ext4_write_dquot, + .acquire_dquot = ext4_acquire_dquot, + .release_dquot = ext4_release_dquot, + .mark_dirty = ext4_mark_dquot_dirty, + .write_info = ext4_write_info, + .alloc_dquot = dquot_alloc, + .destroy_dquot = dquot_destroy, +}; + +static const struct quotactl_ops ext4_qctl_operations = { + .quota_on = ext4_quota_on, + .quota_off = ext4_quota_off, + .quota_sync = dquot_quota_sync, + .get_state = dquot_get_state, + .set_info = dquot_set_dqinfo, + .get_dqblk = dquot_get_dqblk, + .set_dqblk = dquot_set_dqblk +}; +#endif + +static const struct super_operations ext4_sops = { + .alloc_inode = ext4_alloc_inode, + .destroy_inode = ext4_destroy_inode, + .write_inode = ext4_write_inode, + .dirty_inode = ext4_dirty_inode, + .drop_inode = ext4_drop_inode, + .evict_inode = ext4_evict_inode, + .put_super = ext4_put_super, + .sync_fs = ext4_sync_fs, + .freeze_fs = ext4_freeze, + .unfreeze_fs = ext4_unfreeze, + .statfs = ext4_statfs, + .remount_fs = ext4_remount, + .show_options = ext4_show_options, +#ifdef CONFIG_QUOTA + .quota_read = ext4_quota_read, + .quota_write = ext4_quota_write, + .get_dquots = ext4_get_dquots, +#endif + .bdev_try_to_free_page = bdev_try_to_free_page, +}; + +static const struct export_operations ext4_export_ops = { + .fh_to_dentry = ext4_fh_to_dentry, + .fh_to_parent = ext4_fh_to_parent, + .get_parent = ext4_get_parent, +}; + +enum { + Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, + Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro, + Opt_nouid32, Opt_debug, Opt_removed, + Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl, + Opt_auto_da_alloc, Opt_noauto_da_alloc, Opt_noload, + Opt_commit, Opt_min_batch_time, Opt_max_batch_time, Opt_journal_dev, + Opt_journal_path, Opt_journal_checksum, Opt_journal_async_commit, + Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback, + Opt_data_err_abort, Opt_data_err_ignore, Opt_test_dummy_encryption, + Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota, + Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_jqfmt_vfsv1, Opt_quota, + Opt_noquota, Opt_barrier, Opt_nobarrier, Opt_err, + Opt_usrquota, Opt_grpquota, Opt_i_version, Opt_dax, + Opt_stripe, Opt_delalloc, Opt_nodelalloc, Opt_mblk_io_submit, + Opt_lazytime, Opt_nolazytime, + Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity, + Opt_inode_readahead_blks, Opt_journal_ioprio, + Opt_dioread_nolock, Opt_dioread_lock, + Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable, + Opt_max_dir_size_kb, Opt_nojournal_checksum, +}; + +static const match_table_t tokens = { + {Opt_bsd_df, "bsddf"}, + {Opt_minix_df, "minixdf"}, + {Opt_grpid, "grpid"}, + {Opt_grpid, "bsdgroups"}, + {Opt_nogrpid, "nogrpid"}, + {Opt_nogrpid, "sysvgroups"}, + {Opt_resgid, "resgid=%u"}, + {Opt_resuid, "resuid=%u"}, + {Opt_sb, "sb=%u"}, + {Opt_err_cont, "errors=continue"}, + {Opt_err_panic, "errors=panic"}, + {Opt_err_ro, "errors=remount-ro"}, + {Opt_nouid32, "nouid32"}, + {Opt_debug, "debug"}, + {Opt_removed, "oldalloc"}, + {Opt_removed, "orlov"}, + {Opt_user_xattr, "user_xattr"}, + {Opt_nouser_xattr, "nouser_xattr"}, + {Opt_acl, "acl"}, + {Opt_noacl, "noacl"}, + {Opt_noload, "norecovery"}, + {Opt_noload, "noload"}, + {Opt_removed, "nobh"}, + {Opt_removed, "bh"}, + {Opt_commit, "commit=%u"}, + {Opt_min_batch_time, "min_batch_time=%u"}, + {Opt_max_batch_time, "max_batch_time=%u"}, + {Opt_journal_dev, "journal_dev=%u"}, + {Opt_journal_path, "journal_path=%s"}, + {Opt_journal_checksum, "journal_checksum"}, + {Opt_nojournal_checksum, "nojournal_checksum"}, + {Opt_journal_async_commit, "journal_async_commit"}, + {Opt_abort, "abort"}, + {Opt_data_journal, "data=journal"}, + {Opt_data_ordered, "data=ordered"}, + {Opt_data_writeback, "data=writeback"}, + {Opt_data_err_abort, "data_err=abort"}, + {Opt_data_err_ignore, "data_err=ignore"}, + {Opt_offusrjquota, "usrjquota="}, + {Opt_usrjquota, "usrjquota=%s"}, + {Opt_offgrpjquota, "grpjquota="}, + {Opt_grpjquota, "grpjquota=%s"}, + {Opt_jqfmt_vfsold, "jqfmt=vfsold"}, + {Opt_jqfmt_vfsv0, "jqfmt=vfsv0"}, + {Opt_jqfmt_vfsv1, "jqfmt=vfsv1"}, + {Opt_grpquota, "grpquota"}, + {Opt_noquota, "noquota"}, + {Opt_quota, "quota"}, + {Opt_usrquota, "usrquota"}, + {Opt_barrier, "barrier=%u"}, + {Opt_barrier, "barrier"}, + {Opt_nobarrier, "nobarrier"}, + {Opt_i_version, "i_version"}, + {Opt_dax, "dax"}, + {Opt_stripe, "stripe=%u"}, + {Opt_delalloc, "delalloc"}, + {Opt_lazytime, "lazytime"}, + {Opt_nolazytime, "nolazytime"}, + {Opt_nodelalloc, "nodelalloc"}, + {Opt_removed, "mblk_io_submit"}, + {Opt_removed, "nomblk_io_submit"}, + {Opt_block_validity, "block_validity"}, + {Opt_noblock_validity, "noblock_validity"}, + {Opt_inode_readahead_blks, "inode_readahead_blks=%u"}, + {Opt_journal_ioprio, "journal_ioprio=%u"}, + {Opt_auto_da_alloc, "auto_da_alloc=%u"}, + {Opt_auto_da_alloc, "auto_da_alloc"}, + {Opt_noauto_da_alloc, "noauto_da_alloc"}, + {Opt_dioread_nolock, "dioread_nolock"}, + {Opt_dioread_lock, "dioread_lock"}, + {Opt_discard, "discard"}, + {Opt_nodiscard, "nodiscard"}, + {Opt_init_itable, "init_itable=%u"}, + {Opt_init_itable, "init_itable"}, + {Opt_noinit_itable, "noinit_itable"}, + {Opt_max_dir_size_kb, "max_dir_size_kb=%u"}, + {Opt_test_dummy_encryption, "test_dummy_encryption"}, + {Opt_removed, "check=none"}, /* mount option from ext2/3 */ + {Opt_removed, "nocheck"}, /* mount option from ext2/3 */ + {Opt_removed, "reservation"}, /* mount option from ext2/3 */ + {Opt_removed, "noreservation"}, /* mount option from ext2/3 */ + {Opt_removed, "journal=%u"}, /* mount option from ext2/3 */ + {Opt_err, NULL}, +}; + +static ext4_fsblk_t get_sb_block(void **data) +{ + ext4_fsblk_t sb_block; + char *options = (char *) *data; + + if (!options || strncmp(options, "sb=", 3) != 0) + return 1; /* Default location */ + + options += 3; + /* TODO: use simple_strtoll with >32bit ext4 */ + sb_block = simple_strtoul(options, &options, 0); + if (*options && *options != ',') { + printk(KERN_ERR "EXT4-fs: Invalid sb specification: %s\n", + (char *) *data); + return 1; + } + if (*options == ',') + options++; + *data = (void *) options; + + return sb_block; +} + +#define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3)) +static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n" + "Contact linux-ext4@vger.kernel.org if you think we should keep it.\n"; + +#ifdef CONFIG_QUOTA +static int set_qf_name(struct super_block *sb, int qtype, substring_t *args) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + char *qname; + int ret = -1; + + if (sb_any_quota_loaded(sb) && + !sbi->s_qf_names[qtype]) { + ext4_msg(sb, KERN_ERR, + "Cannot change journaled " + "quota options when quota turned on"); + return -1; + } + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) { + ext4_msg(sb, KERN_ERR, "Cannot set journaled quota options " + "when QUOTA feature is enabled"); + return -1; + } + qname = match_strdup(args); + if (!qname) { + ext4_msg(sb, KERN_ERR, + "Not enough memory for storing quotafile name"); + return -1; + } + if (sbi->s_qf_names[qtype]) { + if (strcmp(sbi->s_qf_names[qtype], qname) == 0) + ret = 1; + else + ext4_msg(sb, KERN_ERR, + "%s quota file already specified", + QTYPE2NAME(qtype)); + goto errout; + } + if (strchr(qname, '/')) { + ext4_msg(sb, KERN_ERR, + "quotafile must be on filesystem root"); + goto errout; + } + sbi->s_qf_names[qtype] = qname; + set_opt(sb, QUOTA); + return 1; +errout: + kfree(qname); + return ret; +} + +static int clear_qf_name(struct super_block *sb, int qtype) +{ + + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (sb_any_quota_loaded(sb) && + sbi->s_qf_names[qtype]) { + ext4_msg(sb, KERN_ERR, "Cannot change journaled quota options" + " when quota turned on"); + return -1; + } + kfree(sbi->s_qf_names[qtype]); + sbi->s_qf_names[qtype] = NULL; + return 1; +} +#endif + +#define MOPT_SET 0x0001 +#define MOPT_CLEAR 0x0002 +#define MOPT_NOSUPPORT 0x0004 +#define MOPT_EXPLICIT 0x0008 +#define MOPT_CLEAR_ERR 0x0010 +#define MOPT_GTE0 0x0020 +#ifdef CONFIG_QUOTA +#define MOPT_Q 0 +#define MOPT_QFMT 0x0040 +#else +#define MOPT_Q MOPT_NOSUPPORT +#define MOPT_QFMT MOPT_NOSUPPORT +#endif +#define MOPT_DATAJ 0x0080 +#define MOPT_NO_EXT2 0x0100 +#define MOPT_NO_EXT3 0x0200 +#define MOPT_EXT4_ONLY (MOPT_NO_EXT2 | MOPT_NO_EXT3) +#define MOPT_STRING 0x0400 + +static const struct mount_opts { + int token; + int mount_opt; + int flags; +} ext4_mount_opts[] = { + {Opt_minix_df, EXT4_MOUNT_MINIX_DF, MOPT_SET}, + {Opt_bsd_df, EXT4_MOUNT_MINIX_DF, MOPT_CLEAR}, + {Opt_grpid, EXT4_MOUNT_GRPID, MOPT_SET}, + {Opt_nogrpid, EXT4_MOUNT_GRPID, MOPT_CLEAR}, + {Opt_block_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_SET}, + {Opt_noblock_validity, EXT4_MOUNT_BLOCK_VALIDITY, MOPT_CLEAR}, + {Opt_dioread_nolock, EXT4_MOUNT_DIOREAD_NOLOCK, + MOPT_EXT4_ONLY | MOPT_SET}, + {Opt_dioread_lock, EXT4_MOUNT_DIOREAD_NOLOCK, + MOPT_EXT4_ONLY | MOPT_CLEAR}, + {Opt_discard, EXT4_MOUNT_DISCARD, MOPT_SET}, + {Opt_nodiscard, EXT4_MOUNT_DISCARD, MOPT_CLEAR}, + {Opt_delalloc, EXT4_MOUNT_DELALLOC, + MOPT_EXT4_ONLY | MOPT_SET | MOPT_EXPLICIT}, + {Opt_nodelalloc, EXT4_MOUNT_DELALLOC, + MOPT_EXT4_ONLY | MOPT_CLEAR}, + {Opt_nojournal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, + MOPT_EXT4_ONLY | MOPT_CLEAR}, + {Opt_journal_checksum, EXT4_MOUNT_JOURNAL_CHECKSUM, + MOPT_EXT4_ONLY | MOPT_SET}, + {Opt_journal_async_commit, (EXT4_MOUNT_JOURNAL_ASYNC_COMMIT | + EXT4_MOUNT_JOURNAL_CHECKSUM), + MOPT_EXT4_ONLY | MOPT_SET}, + {Opt_noload, EXT4_MOUNT_NOLOAD, MOPT_NO_EXT2 | MOPT_SET}, + {Opt_err_panic, EXT4_MOUNT_ERRORS_PANIC, MOPT_SET | MOPT_CLEAR_ERR}, + {Opt_err_ro, EXT4_MOUNT_ERRORS_RO, MOPT_SET | MOPT_CLEAR_ERR}, + {Opt_err_cont, EXT4_MOUNT_ERRORS_CONT, MOPT_SET | MOPT_CLEAR_ERR}, + {Opt_data_err_abort, EXT4_MOUNT_DATA_ERR_ABORT, + MOPT_NO_EXT2 | MOPT_SET}, + {Opt_data_err_ignore, EXT4_MOUNT_DATA_ERR_ABORT, + MOPT_NO_EXT2 | MOPT_CLEAR}, + {Opt_barrier, EXT4_MOUNT_BARRIER, MOPT_SET}, + {Opt_nobarrier, EXT4_MOUNT_BARRIER, MOPT_CLEAR}, + {Opt_noauto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_SET}, + {Opt_auto_da_alloc, EXT4_MOUNT_NO_AUTO_DA_ALLOC, MOPT_CLEAR}, + {Opt_noinit_itable, EXT4_MOUNT_INIT_INODE_TABLE, MOPT_CLEAR}, + {Opt_commit, 0, MOPT_GTE0}, + {Opt_max_batch_time, 0, MOPT_GTE0}, + {Opt_min_batch_time, 0, MOPT_GTE0}, + {Opt_inode_readahead_blks, 0, MOPT_GTE0}, + {Opt_init_itable, 0, MOPT_GTE0}, + {Opt_dax, EXT4_MOUNT_DAX, MOPT_SET}, + {Opt_stripe, 0, MOPT_GTE0}, + {Opt_resuid, 0, MOPT_GTE0}, + {Opt_resgid, 0, MOPT_GTE0}, + {Opt_journal_dev, 0, MOPT_GTE0}, + {Opt_journal_path, 0, MOPT_STRING}, + {Opt_journal_ioprio, 0, MOPT_GTE0}, + {Opt_data_journal, EXT4_MOUNT_JOURNAL_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, + {Opt_data_ordered, EXT4_MOUNT_ORDERED_DATA, MOPT_NO_EXT2 | MOPT_DATAJ}, + {Opt_data_writeback, EXT4_MOUNT_WRITEBACK_DATA, + MOPT_NO_EXT2 | MOPT_DATAJ}, + {Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET}, + {Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR}, +#ifdef CONFIG_EXT4_FS_POSIX_ACL + {Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET}, + {Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR}, +#else + {Opt_acl, 0, MOPT_NOSUPPORT}, + {Opt_noacl, 0, MOPT_NOSUPPORT}, +#endif + {Opt_nouid32, EXT4_MOUNT_NO_UID32, MOPT_SET}, + {Opt_debug, EXT4_MOUNT_DEBUG, MOPT_SET}, + {Opt_quota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, MOPT_SET | MOPT_Q}, + {Opt_usrquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA, + MOPT_SET | MOPT_Q}, + {Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA, + MOPT_SET | MOPT_Q}, + {Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA | + EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q}, + {Opt_usrjquota, 0, MOPT_Q}, + {Opt_grpjquota, 0, MOPT_Q}, + {Opt_offusrjquota, 0, MOPT_Q}, + {Opt_offgrpjquota, 0, MOPT_Q}, + {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT}, + {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT}, + {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT}, + {Opt_max_dir_size_kb, 0, MOPT_GTE0}, + {Opt_test_dummy_encryption, 0, MOPT_GTE0}, + {Opt_err, 0, 0} +}; + +static int handle_mount_opt(struct super_block *sb, char *opt, int token, + substring_t *args, unsigned long *journal_devnum, + unsigned int *journal_ioprio, int is_remount) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + const struct mount_opts *m; + kuid_t uid; + kgid_t gid; + int arg = 0; + +#ifdef CONFIG_QUOTA + if (token == Opt_usrjquota) + return set_qf_name(sb, USRQUOTA, &args[0]); + else if (token == Opt_grpjquota) + return set_qf_name(sb, GRPQUOTA, &args[0]); + else if (token == Opt_offusrjquota) + return clear_qf_name(sb, USRQUOTA); + else if (token == Opt_offgrpjquota) + return clear_qf_name(sb, GRPQUOTA); +#endif + switch (token) { + case Opt_noacl: + case Opt_nouser_xattr: + ext4_msg(sb, KERN_WARNING, deprecated_msg, opt, "3.5"); + break; + case Opt_sb: + return 1; /* handled by get_sb_block() */ + case Opt_removed: + ext4_msg(sb, KERN_WARNING, "Ignoring removed %s option", opt); + return 1; + case Opt_abort: + sbi->s_mount_flags |= EXT4_MF_FS_ABORTED; + return 1; + case Opt_i_version: + sb->s_flags |= MS_I_VERSION; + return 1; + case Opt_lazytime: + sb->s_flags |= MS_LAZYTIME; + return 1; + case Opt_nolazytime: + sb->s_flags &= ~MS_LAZYTIME; + return 1; + } + + for (m = ext4_mount_opts; m->token != Opt_err; m++) + if (token == m->token) + break; + + if (m->token == Opt_err) { + ext4_msg(sb, KERN_ERR, "Unrecognized mount option \"%s\" " + "or missing value", opt); + return -1; + } + + if ((m->flags & MOPT_NO_EXT2) && IS_EXT2_SB(sb)) { + ext4_msg(sb, KERN_ERR, + "Mount option \"%s\" incompatible with ext2", opt); + return -1; + } + if ((m->flags & MOPT_NO_EXT3) && IS_EXT3_SB(sb)) { + ext4_msg(sb, KERN_ERR, + "Mount option \"%s\" incompatible with ext3", opt); + return -1; + } + + if (args->from && !(m->flags & MOPT_STRING) && match_int(args, &arg)) + return -1; + if (args->from && (m->flags & MOPT_GTE0) && (arg < 0)) + return -1; + if (m->flags & MOPT_EXPLICIT) + set_opt2(sb, EXPLICIT_DELALLOC); + if (m->flags & MOPT_CLEAR_ERR) + clear_opt(sb, ERRORS_MASK); + if (token == Opt_noquota && sb_any_quota_loaded(sb)) { + ext4_msg(sb, KERN_ERR, "Cannot change quota " + "options when quota turned on"); + return -1; + } + + if (m->flags & MOPT_NOSUPPORT) { + ext4_msg(sb, KERN_ERR, "%s option not supported", opt); + } else if (token == Opt_commit) { + if (arg == 0) + arg = JBD2_DEFAULT_MAX_COMMIT_AGE; + sbi->s_commit_interval = HZ * arg; + } else if (token == Opt_max_batch_time) { + sbi->s_max_batch_time = arg; + } else if (token == Opt_min_batch_time) { + sbi->s_min_batch_time = arg; + } else if (token == Opt_inode_readahead_blks) { + if (arg && (arg > (1 << 30) || !is_power_of_2(arg))) { + ext4_msg(sb, KERN_ERR, + "EXT4-fs: inode_readahead_blks must be " + "0 or a power of 2 smaller than 2^31"); + return -1; + } + sbi->s_inode_readahead_blks = arg; + } else if (token == Opt_init_itable) { + set_opt(sb, INIT_INODE_TABLE); + if (!args->from) + arg = EXT4_DEF_LI_WAIT_MULT; + sbi->s_li_wait_mult = arg; + } else if (token == Opt_max_dir_size_kb) { + sbi->s_max_dir_size_kb = arg; + } else if (token == Opt_stripe) { + sbi->s_stripe = arg; + } else if (token == Opt_resuid) { + uid = make_kuid(current_user_ns(), arg); + if (!uid_valid(uid)) { + ext4_msg(sb, KERN_ERR, "Invalid uid value %d", arg); + return -1; + } + sbi->s_resuid = uid; + } else if (token == Opt_resgid) { + gid = make_kgid(current_user_ns(), arg); + if (!gid_valid(gid)) { + ext4_msg(sb, KERN_ERR, "Invalid gid value %d", arg); + return -1; + } + sbi->s_resgid = gid; + } else if (token == Opt_journal_dev) { + if (is_remount) { + ext4_msg(sb, KERN_ERR, + "Cannot specify journal on remount"); + return -1; + } + *journal_devnum = arg; + } else if (token == Opt_journal_path) { + char *journal_path; + struct inode *journal_inode; + struct path path; + int error; + + if (is_remount) { + ext4_msg(sb, KERN_ERR, + "Cannot specify journal on remount"); + return -1; + } + journal_path = match_strdup(&args[0]); + if (!journal_path) { + ext4_msg(sb, KERN_ERR, "error: could not dup " + "journal device string"); + return -1; + } + + error = kern_path(journal_path, LOOKUP_FOLLOW, &path); + if (error) { + ext4_msg(sb, KERN_ERR, "error: could not find " + "journal device path: error %d", error); + kfree(journal_path); + return -1; + } + + journal_inode = d_inode(path.dentry); + if (!S_ISBLK(journal_inode->i_mode)) { + ext4_msg(sb, KERN_ERR, "error: journal path %s " + "is not a block device", journal_path); + path_put(&path); + kfree(journal_path); + return -1; + } + + *journal_devnum = new_encode_dev(journal_inode->i_rdev); + path_put(&path); + kfree(journal_path); + } else if (token == Opt_journal_ioprio) { + if (arg > 7) { + ext4_msg(sb, KERN_ERR, "Invalid journal IO priority" + " (must be 0-7)"); + return -1; + } + *journal_ioprio = + IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, arg); + } else if (token == Opt_test_dummy_encryption) { +#ifdef CONFIG_EXT4_FS_ENCRYPTION + sbi->s_mount_flags |= EXT4_MF_TEST_DUMMY_ENCRYPTION; + ext4_msg(sb, KERN_WARNING, + "Test dummy encryption mode enabled"); +#else + ext4_msg(sb, KERN_WARNING, + "Test dummy encryption mount option ignored"); +#endif + } else if (m->flags & MOPT_DATAJ) { + if (is_remount) { + if (!sbi->s_journal) + ext4_msg(sb, KERN_WARNING, "Remounting file system with no journal so ignoring journalled data option"); + else if (test_opt(sb, DATA_FLAGS) != m->mount_opt) { + ext4_msg(sb, KERN_ERR, + "Cannot change data mode on remount"); + return -1; + } + } else { + clear_opt(sb, DATA_FLAGS); + sbi->s_mount_opt |= m->mount_opt; + } +#ifdef CONFIG_QUOTA + } else if (m->flags & MOPT_QFMT) { + if (sb_any_quota_loaded(sb) && + sbi->s_jquota_fmt != m->mount_opt) { + ext4_msg(sb, KERN_ERR, "Cannot change journaled " + "quota options when quota turned on"); + return -1; + } + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_QUOTA)) { + ext4_msg(sb, KERN_ERR, + "Cannot set journaled quota options " + "when QUOTA feature is enabled"); + return -1; + } + sbi->s_jquota_fmt = m->mount_opt; +#endif +#ifndef CONFIG_FS_DAX + } else if (token == Opt_dax) { + ext4_msg(sb, KERN_INFO, "dax option not supported"); + return -1; +#endif + } else { + if (!args->from) + arg = 1; + if (m->flags & MOPT_CLEAR) + arg = !arg; + else if (unlikely(!(m->flags & MOPT_SET))) { + ext4_msg(sb, KERN_WARNING, + "buggy handling of option %s", opt); + WARN_ON(1); + return -1; + } + if (arg != 0) + sbi->s_mount_opt |= m->mount_opt; + else + sbi->s_mount_opt &= ~m->mount_opt; + } + return 1; +} + +static int parse_options(char *options, struct super_block *sb, + unsigned long *journal_devnum, + unsigned int *journal_ioprio, + int is_remount) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + char *p; + substring_t args[MAX_OPT_ARGS]; + int token; + + if (!options) + return 1; + + while ((p = strsep(&options, ",")) != NULL) { + if (!*p) + continue; + /* + * Initialize args struct so we know whether arg was + * found; some options take optional arguments. + */ + args[0].to = args[0].from = NULL; + token = match_token(p, tokens, args); + if (handle_mount_opt(sb, p, token, args, journal_devnum, + journal_ioprio, is_remount) < 0) + return 0; + } +#ifdef CONFIG_QUOTA + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) && + (test_opt(sb, USRQUOTA) || test_opt(sb, GRPQUOTA))) { + ext4_msg(sb, KERN_ERR, "Cannot set quota options when QUOTA " + "feature is enabled"); + return 0; + } + if (sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { + if (test_opt(sb, USRQUOTA) && sbi->s_qf_names[USRQUOTA]) + clear_opt(sb, USRQUOTA); + + if (test_opt(sb, GRPQUOTA) && sbi->s_qf_names[GRPQUOTA]) + clear_opt(sb, GRPQUOTA); + + if (test_opt(sb, GRPQUOTA) || test_opt(sb, USRQUOTA)) { + ext4_msg(sb, KERN_ERR, "old and new quota " + "format mixing"); + return 0; + } + + if (!sbi->s_jquota_fmt) { + ext4_msg(sb, KERN_ERR, "journaled quota format " + "not specified"); + return 0; + } + } +#endif + if (test_opt(sb, DIOREAD_NOLOCK)) { + int blocksize = + BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); + + if (blocksize < PAGE_CACHE_SIZE) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "dioread_nolock if block size != PAGE_SIZE"); + return 0; + } + } + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA && + test_opt(sb, JOURNAL_ASYNC_COMMIT)) { + ext4_msg(sb, KERN_ERR, "can't mount with journal_async_commit " + "in data=ordered mode"); + return 0; + } + return 1; +} + +static inline void ext4_show_quota_options(struct seq_file *seq, + struct super_block *sb) +{ +#if defined(CONFIG_QUOTA) + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (sbi->s_jquota_fmt) { + char *fmtname = ""; + + switch (sbi->s_jquota_fmt) { + case QFMT_VFS_OLD: + fmtname = "vfsold"; + break; + case QFMT_VFS_V0: + fmtname = "vfsv0"; + break; + case QFMT_VFS_V1: + fmtname = "vfsv1"; + break; + } + seq_printf(seq, ",jqfmt=%s", fmtname); + } + + if (sbi->s_qf_names[USRQUOTA]) + seq_printf(seq, ",usrjquota=%s", sbi->s_qf_names[USRQUOTA]); + + if (sbi->s_qf_names[GRPQUOTA]) + seq_printf(seq, ",grpjquota=%s", sbi->s_qf_names[GRPQUOTA]); +#endif +} + +static const char *token2str(int token) +{ + const struct match_token *t; + + for (t = tokens; t->token != Opt_err; t++) + if (t->token == token && !strchr(t->pattern, '=')) + break; + return t->pattern; +} + +/* + * Show an option if + * - it's set to a non-default value OR + * - if the per-sb default is different from the global default + */ +static int _ext4_show_options(struct seq_file *seq, struct super_block *sb, + int nodefs) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + int def_errors, def_mount_opt = nodefs ? 0 : sbi->s_def_mount_opt; + const struct mount_opts *m; + char sep = nodefs ? '\n' : ','; + +#define SEQ_OPTS_PUTS(str) seq_printf(seq, "%c" str, sep) +#define SEQ_OPTS_PRINT(str, arg) seq_printf(seq, "%c" str, sep, arg) + + if (sbi->s_sb_block != 1) + SEQ_OPTS_PRINT("sb=%llu", sbi->s_sb_block); + + for (m = ext4_mount_opts; m->token != Opt_err; m++) { + int want_set = m->flags & MOPT_SET; + if (((m->flags & (MOPT_SET|MOPT_CLEAR)) == 0) || + (m->flags & MOPT_CLEAR_ERR)) + continue; + if (!(m->mount_opt & (sbi->s_mount_opt ^ def_mount_opt))) + continue; /* skip if same as the default */ + if ((want_set && + (sbi->s_mount_opt & m->mount_opt) != m->mount_opt) || + (!want_set && (sbi->s_mount_opt & m->mount_opt))) + continue; /* select Opt_noFoo vs Opt_Foo */ + SEQ_OPTS_PRINT("%s", token2str(m->token)); + } + + if (nodefs || !uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT4_DEF_RESUID)) || + le16_to_cpu(es->s_def_resuid) != EXT4_DEF_RESUID) + SEQ_OPTS_PRINT("resuid=%u", + from_kuid_munged(&init_user_ns, sbi->s_resuid)); + if (nodefs || !gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT4_DEF_RESGID)) || + le16_to_cpu(es->s_def_resgid) != EXT4_DEF_RESGID) + SEQ_OPTS_PRINT("resgid=%u", + from_kgid_munged(&init_user_ns, sbi->s_resgid)); + def_errors = nodefs ? -1 : le16_to_cpu(es->s_errors); + if (test_opt(sb, ERRORS_RO) && def_errors != EXT4_ERRORS_RO) + SEQ_OPTS_PUTS("errors=remount-ro"); + if (test_opt(sb, ERRORS_CONT) && def_errors != EXT4_ERRORS_CONTINUE) + SEQ_OPTS_PUTS("errors=continue"); + if (test_opt(sb, ERRORS_PANIC) && def_errors != EXT4_ERRORS_PANIC) + SEQ_OPTS_PUTS("errors=panic"); + if (nodefs || sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) + SEQ_OPTS_PRINT("commit=%lu", sbi->s_commit_interval / HZ); + if (nodefs || sbi->s_min_batch_time != EXT4_DEF_MIN_BATCH_TIME) + SEQ_OPTS_PRINT("min_batch_time=%u", sbi->s_min_batch_time); + if (nodefs || sbi->s_max_batch_time != EXT4_DEF_MAX_BATCH_TIME) + SEQ_OPTS_PRINT("max_batch_time=%u", sbi->s_max_batch_time); + if (sb->s_flags & MS_I_VERSION) + SEQ_OPTS_PUTS("i_version"); + if (nodefs || sbi->s_stripe) + SEQ_OPTS_PRINT("stripe=%lu", sbi->s_stripe); + if (EXT4_MOUNT_DATA_FLAGS & (sbi->s_mount_opt ^ def_mount_opt)) { + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) + SEQ_OPTS_PUTS("data=journal"); + else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) + SEQ_OPTS_PUTS("data=ordered"); + else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_WRITEBACK_DATA) + SEQ_OPTS_PUTS("data=writeback"); + } + if (nodefs || + sbi->s_inode_readahead_blks != EXT4_DEF_INODE_READAHEAD_BLKS) + SEQ_OPTS_PRINT("inode_readahead_blks=%u", + sbi->s_inode_readahead_blks); + + if (nodefs || (test_opt(sb, INIT_INODE_TABLE) && + (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT))) + SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult); + if (nodefs || sbi->s_max_dir_size_kb) + SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb); + + ext4_show_quota_options(seq, sb); + return 0; +} + +static int ext4_show_options(struct seq_file *seq, struct dentry *root) +{ + return _ext4_show_options(seq, root->d_sb, 0); +} + +static int options_seq_show(struct seq_file *seq, void *offset) +{ + struct super_block *sb = seq->private; + int rc; + + seq_puts(seq, (sb->s_flags & MS_RDONLY) ? "ro" : "rw"); + rc = _ext4_show_options(seq, sb, 1); + seq_puts(seq, "\n"); + return rc; +} + +static int options_open_fs(struct inode *inode, struct file *file) +{ + return single_open(file, options_seq_show, PDE_DATA(inode)); +} + +static const struct file_operations ext4_seq_options_fops = { + .owner = THIS_MODULE, + .open = options_open_fs, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es, + int read_only) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + int res = 0; + + if (le32_to_cpu(es->s_rev_level) > EXT4_MAX_SUPP_REV) { + ext4_msg(sb, KERN_ERR, "revision level too high, " + "forcing read-only mode"); + res = MS_RDONLY; + } + if (read_only) + goto done; + if (!(sbi->s_mount_state & EXT4_VALID_FS)) + ext4_msg(sb, KERN_WARNING, "warning: mounting unchecked fs, " + "running e2fsck is recommended"); + else if (sbi->s_mount_state & EXT4_ERROR_FS) + ext4_msg(sb, KERN_WARNING, + "warning: mounting fs with errors, " + "running e2fsck is recommended"); + else if ((__s16) le16_to_cpu(es->s_max_mnt_count) > 0 && + le16_to_cpu(es->s_mnt_count) >= + (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) + ext4_msg(sb, KERN_WARNING, + "warning: maximal mount count reached, " + "running e2fsck is recommended"); + else if (le32_to_cpu(es->s_checkinterval) && + (le32_to_cpu(es->s_lastcheck) + + le32_to_cpu(es->s_checkinterval) <= get_seconds())) + ext4_msg(sb, KERN_WARNING, + "warning: checktime reached, " + "running e2fsck is recommended"); + if (!sbi->s_journal) + es->s_state &= cpu_to_le16(~EXT4_VALID_FS); + if (!(__s16) le16_to_cpu(es->s_max_mnt_count)) + es->s_max_mnt_count = cpu_to_le16(EXT4_DFL_MAX_MNT_COUNT); + le16_add_cpu(&es->s_mnt_count, 1); + es->s_mtime = cpu_to_le32(get_seconds()); + ext4_update_dynamic_rev(sb); + if (sbi->s_journal) + EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); + + ext4_commit_super(sb, 1); +done: + if (test_opt(sb, DEBUG)) + printk(KERN_INFO "[EXT4 FS bs=%lu, gc=%u, " + "bpg=%lu, ipg=%lu, mo=%04x, mo2=%04x]\n", + sb->s_blocksize, + sbi->s_groups_count, + EXT4_BLOCKS_PER_GROUP(sb), + EXT4_INODES_PER_GROUP(sb), + sbi->s_mount_opt, sbi->s_mount_opt2); + + cleancache_init_fs(sb); + return res; +} + +int ext4_alloc_flex_bg_array(struct super_block *sb, ext4_group_t ngroup) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct flex_groups *new_groups; + int size; + + if (!sbi->s_log_groups_per_flex) + return 0; + + size = ext4_flex_group(sbi, ngroup - 1) + 1; + if (size <= sbi->s_flex_groups_allocated) + return 0; + + size = roundup_pow_of_two(size * sizeof(struct flex_groups)); + new_groups = ext4_kvzalloc(size, GFP_KERNEL); + if (!new_groups) { + ext4_msg(sb, KERN_ERR, "not enough memory for %d flex groups", + size / (int) sizeof(struct flex_groups)); + return -ENOMEM; + } + + if (sbi->s_flex_groups) { + memcpy(new_groups, sbi->s_flex_groups, + (sbi->s_flex_groups_allocated * + sizeof(struct flex_groups))); + kvfree(sbi->s_flex_groups); + } + sbi->s_flex_groups = new_groups; + sbi->s_flex_groups_allocated = size / sizeof(struct flex_groups); + return 0; +} + +static int ext4_fill_flex_info(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_group_desc *gdp = NULL; + ext4_group_t flex_group; + int i, err; + + sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex; + if (sbi->s_log_groups_per_flex < 1 || sbi->s_log_groups_per_flex > 31) { + sbi->s_log_groups_per_flex = 0; + return 1; + } + + err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count); + if (err) + goto failed; + + for (i = 0; i < sbi->s_groups_count; i++) { + gdp = ext4_get_group_desc(sb, i, NULL); + + flex_group = ext4_flex_group(sbi, i); + atomic_add(ext4_free_inodes_count(sb, gdp), + &sbi->s_flex_groups[flex_group].free_inodes); + atomic64_add(ext4_free_group_clusters(sb, gdp), + &sbi->s_flex_groups[flex_group].free_clusters); + atomic_add(ext4_used_dirs_count(sb, gdp), + &sbi->s_flex_groups[flex_group].used_dirs); + } + + return 1; +failed: + return 0; +} + +static __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group, + struct ext4_group_desc *gdp) +{ + int offset; + __u16 crc = 0; + __le32 le_group = cpu_to_le32(block_group); + + if (ext4_has_metadata_csum(sbi->s_sb)) { + /* Use new metadata_csum algorithm */ + __le16 save_csum; + __u32 csum32; + + save_csum = gdp->bg_checksum; + gdp->bg_checksum = 0; + csum32 = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&le_group, + sizeof(le_group)); + csum32 = ext4_chksum(sbi, csum32, (__u8 *)gdp, + sbi->s_desc_size); + gdp->bg_checksum = save_csum; + + crc = csum32 & 0xFFFF; + goto out; + } + + /* old crc16 code */ + if (!(sbi->s_es->s_feature_ro_compat & + cpu_to_le32(EXT4_FEATURE_RO_COMPAT_GDT_CSUM))) + return 0; + + offset = offsetof(struct ext4_group_desc, bg_checksum); + + crc = crc16(~0, sbi->s_es->s_uuid, sizeof(sbi->s_es->s_uuid)); + crc = crc16(crc, (__u8 *)&le_group, sizeof(le_group)); + crc = crc16(crc, (__u8 *)gdp, offset); + offset += sizeof(gdp->bg_checksum); /* skip checksum */ + /* for checksum of struct ext4_group_desc do the rest...*/ + if ((sbi->s_es->s_feature_incompat & + cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT)) && + offset < le16_to_cpu(sbi->s_es->s_desc_size)) + crc = crc16(crc, (__u8 *)gdp + offset, + le16_to_cpu(sbi->s_es->s_desc_size) - + offset); + +out: + return cpu_to_le16(crc); +} + +int ext4_group_desc_csum_verify(struct super_block *sb, __u32 block_group, + struct ext4_group_desc *gdp) +{ + if (ext4_has_group_desc_csum(sb) && + (gdp->bg_checksum != ext4_group_desc_csum(EXT4_SB(sb), + block_group, gdp))) + return 0; + + return 1; +} + +void ext4_group_desc_csum_set(struct super_block *sb, __u32 block_group, + struct ext4_group_desc *gdp) +{ + if (!ext4_has_group_desc_csum(sb)) + return; + gdp->bg_checksum = ext4_group_desc_csum(EXT4_SB(sb), block_group, gdp); +} + +/* Called at mount-time, super-block is locked */ +static int ext4_check_descriptors(struct super_block *sb, + ext4_group_t *first_not_zeroed) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + ext4_fsblk_t first_block = le32_to_cpu(sbi->s_es->s_first_data_block); + ext4_fsblk_t last_block; + ext4_fsblk_t block_bitmap; + ext4_fsblk_t inode_bitmap; + ext4_fsblk_t inode_table; + int flexbg_flag = 0; + ext4_group_t i, grp = sbi->s_groups_count; + + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) + flexbg_flag = 1; + + ext4_debug("Checking group descriptors"); + + for (i = 0; i < sbi->s_groups_count; i++) { + struct ext4_group_desc *gdp = ext4_get_group_desc(sb, i, NULL); + + if (i == sbi->s_groups_count - 1 || flexbg_flag) + last_block = ext4_blocks_count(sbi->s_es) - 1; + else + last_block = first_block + + (EXT4_BLOCKS_PER_GROUP(sb) - 1); + + if ((grp == sbi->s_groups_count) && + !(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) + grp = i; + + block_bitmap = ext4_block_bitmap(sb, gdp); + if (block_bitmap < first_block || block_bitmap > last_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Block bitmap for group %u not in group " + "(block %llu)!", i, block_bitmap); + return 0; + } + inode_bitmap = ext4_inode_bitmap(sb, gdp); + if (inode_bitmap < first_block || inode_bitmap > last_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode bitmap for group %u not in group " + "(block %llu)!", i, inode_bitmap); + return 0; + } + inode_table = ext4_inode_table(sb, gdp); + if (inode_table < first_block || + inode_table + sbi->s_itb_per_group - 1 > last_block) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Inode table for group %u not in group " + "(block %llu)!", i, inode_table); + return 0; + } + ext4_lock_group(sb, i); + if (!ext4_group_desc_csum_verify(sb, i, gdp)) { + ext4_msg(sb, KERN_ERR, "ext4_check_descriptors: " + "Checksum for group %u failed (%u!=%u)", + i, le16_to_cpu(ext4_group_desc_csum(sbi, i, + gdp)), le16_to_cpu(gdp->bg_checksum)); + if (!(sb->s_flags & MS_RDONLY)) { + ext4_unlock_group(sb, i); + return 0; + } + } + ext4_unlock_group(sb, i); + if (!flexbg_flag) + first_block += EXT4_BLOCKS_PER_GROUP(sb); + } + if (NULL != first_not_zeroed) + *first_not_zeroed = grp; + return 1; +} + +/* ext4_orphan_cleanup() walks a singly-linked list of inodes (starting at + * the superblock) which were deleted from all directories, but held open by + * a process at the time of a crash. We walk the list and try to delete these + * inodes at recovery time (only with a read-write filesystem). + * + * In order to keep the orphan inode chain consistent during traversal (in + * case of crash during recovery), we link each inode into the superblock + * orphan list_head and handle it the same way as an inode deletion during + * normal operation (which journals the operations for us). + * + * We only do an iget() and an iput() on each inode, which is very safe if we + * accidentally point at an in-use or already deleted inode. The worst that + * can happen in this case is that we get a "bit already cleared" message from + * ext4_free_inode(). The only reason we would point at a wrong inode is if + * e2fsck was run on this filesystem, and it must have already done the orphan + * inode cleanup for us, so we can safely abort without any further action. + */ +static void ext4_orphan_cleanup(struct super_block *sb, + struct ext4_super_block *es) +{ + unsigned int s_flags = sb->s_flags; + int nr_orphans = 0, nr_truncates = 0; +#ifdef CONFIG_QUOTA + int i; +#endif + if (!es->s_last_orphan) { + jbd_debug(4, "no orphan inodes to clean up\n"); + return; + } + + if (bdev_read_only(sb->s_bdev)) { + ext4_msg(sb, KERN_ERR, "write access " + "unavailable, skipping orphan cleanup"); + return; + } + + /* Check if feature set would not allow a r/w mount */ + if (!ext4_feature_set_ok(sb, 0)) { + ext4_msg(sb, KERN_INFO, "Skipping orphan cleanup due to " + "unknown ROCOMPAT features"); + return; + } + + if (EXT4_SB(sb)->s_mount_state & EXT4_ERROR_FS) { + /* don't clear list on RO mount w/ errors */ + if (es->s_last_orphan && !(s_flags & MS_RDONLY)) { + ext4_msg(sb, KERN_INFO, "Errors on filesystem, " + "clearing orphan list.\n"); + es->s_last_orphan = 0; + } + jbd_debug(1, "Skipping orphan recovery on fs with errors.\n"); + return; + } + + if (s_flags & MS_RDONLY) { + ext4_msg(sb, KERN_INFO, "orphan cleanup on readonly fs"); + sb->s_flags &= ~MS_RDONLY; + } +#ifdef CONFIG_QUOTA + /* Needed for iput() to work correctly and not trash data */ + sb->s_flags |= MS_ACTIVE; + /* Turn on quotas so that they are updated correctly */ + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + if (EXT4_SB(sb)->s_qf_names[i]) { + int ret = ext4_quota_on_mount(sb, i); + if (ret < 0) + ext4_msg(sb, KERN_ERR, + "Cannot turn on journaled " + "quota: error %d", ret); + } + } +#endif + + while (es->s_last_orphan) { + struct inode *inode; + + inode = ext4_orphan_get(sb, le32_to_cpu(es->s_last_orphan)); + if (IS_ERR(inode)) { + es->s_last_orphan = 0; + break; + } + + list_add(&EXT4_I(inode)->i_orphan, &EXT4_SB(sb)->s_orphan); + dquot_initialize(inode); + if (inode->i_nlink) { + if (test_opt(sb, DEBUG)) + ext4_msg(sb, KERN_DEBUG, + "%s: truncating inode %lu to %lld bytes", + __func__, inode->i_ino, inode->i_size); + jbd_debug(2, "truncating inode %lu to %lld bytes\n", + inode->i_ino, inode->i_size); + mutex_lock(&inode->i_mutex); + truncate_inode_pages(inode->i_mapping, inode->i_size); + ext4_truncate(inode); + mutex_unlock(&inode->i_mutex); + nr_truncates++; + } else { + if (test_opt(sb, DEBUG)) + ext4_msg(sb, KERN_DEBUG, + "%s: deleting unreferenced inode %lu", + __func__, inode->i_ino); + jbd_debug(2, "deleting unreferenced inode %lu\n", + inode->i_ino); + nr_orphans++; + } + iput(inode); /* The delete magic happens here! */ + } + +#define PLURAL(x) (x), ((x) == 1) ? "" : "s" + + if (nr_orphans) + ext4_msg(sb, KERN_INFO, "%d orphan inode%s deleted", + PLURAL(nr_orphans)); + if (nr_truncates) + ext4_msg(sb, KERN_INFO, "%d truncate%s cleaned up", + PLURAL(nr_truncates)); +#ifdef CONFIG_QUOTA + /* Turn quotas off */ + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + if (sb_dqopt(sb)->files[i]) + dquot_quota_off(sb, i); + } +#endif + sb->s_flags = s_flags; /* Restore MS_RDONLY status */ +} + +/* + * Maximal extent format file size. + * Resulting logical blkno at s_maxbytes must fit in our on-disk + * extent format containers, within a sector_t, and within i_blocks + * in the vfs. ext4 inode has 48 bits of i_block in fsblock units, + * so that won't be a limiting factor. + * + * However there is other limiting factor. We do store extents in the form + * of starting block and length, hence the resulting length of the extent + * covering maximum file size must fit into on-disk format containers as + * well. Given that length is always by 1 unit bigger than max unit (because + * we count 0 as well) we have to lower the s_maxbytes by one fs block. + * + * Note, this does *not* consider any metadata overhead for vfs i_blocks. + */ +static loff_t ext4_max_size(int blkbits, int has_huge_files) +{ + loff_t res; + loff_t upper_limit = MAX_LFS_FILESIZE; + + /* small i_blocks in vfs inode? */ + if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { + /* + * CONFIG_LBDAF is not enabled implies the inode + * i_block represent total blocks in 512 bytes + * 32 == size of vfs inode i_blocks * 8 + */ + upper_limit = (1LL << 32) - 1; + + /* total blocks in file system block size */ + upper_limit >>= (blkbits - 9); + upper_limit <<= blkbits; + } + + /* + * 32-bit extent-start container, ee_block. We lower the maxbytes + * by one fs block, so ee_len can cover the extent of maximum file + * size + */ + res = (1LL << 32) - 1; + res <<= blkbits; + + /* Sanity check against vm- & vfs- imposed limits */ + if (res > upper_limit) + res = upper_limit; + + return res; +} + +/* + * Maximal bitmap file size. There is a direct, and {,double-,triple-}indirect + * block limit, and also a limit of (2^48 - 1) 512-byte sectors in i_blocks. + * We need to be 1 filesystem block less than the 2^48 sector limit. + */ +static loff_t ext4_max_bitmap_size(int bits, int has_huge_files) +{ + loff_t res = EXT4_NDIR_BLOCKS; + int meta_blocks; + loff_t upper_limit; + /* This is calculated to be the largest file size for a dense, block + * mapped file such that the file's total number of 512-byte sectors, + * including data and all indirect blocks, does not exceed (2^48 - 1). + * + * __u32 i_blocks_lo and _u16 i_blocks_high represent the total + * number of 512-byte sectors of the file. + */ + + if (!has_huge_files || sizeof(blkcnt_t) < sizeof(u64)) { + /* + * !has_huge_files or CONFIG_LBDAF not enabled implies that + * the inode i_block field represents total file blocks in + * 2^32 512-byte sectors == size of vfs inode i_blocks * 8 + */ + upper_limit = (1LL << 32) - 1; + + /* total blocks in file system block size */ + upper_limit >>= (bits - 9); + + } else { + /* + * We use 48 bit ext4_inode i_blocks + * With EXT4_HUGE_FILE_FL set the i_blocks + * represent total number of blocks in + * file system block size + */ + upper_limit = (1LL << 48) - 1; + + } + + /* indirect blocks */ + meta_blocks = 1; + /* double indirect blocks */ + meta_blocks += 1 + (1LL << (bits-2)); + /* tripple indirect blocks */ + meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); + + upper_limit -= meta_blocks; + upper_limit <<= bits; + + res += 1LL << (bits-2); + res += 1LL << (2*(bits-2)); + res += 1LL << (3*(bits-2)); + res <<= bits; + if (res > upper_limit) + res = upper_limit; + + if (res > MAX_LFS_FILESIZE) + res = MAX_LFS_FILESIZE; + + return res; +} + +static ext4_fsblk_t descriptor_loc(struct super_block *sb, + ext4_fsblk_t logical_sb_block, int nr) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + ext4_group_t bg, first_meta_bg; + int has_super = 0; + + first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); + + if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_META_BG) || + nr < first_meta_bg) + return logical_sb_block + nr + 1; + bg = sbi->s_desc_per_block * nr; + if (ext4_bg_has_super(sb, bg)) + has_super = 1; + + /* + * If we have a meta_bg fs with 1k blocks, group 0's GDT is at + * block 2, not 1. If s_first_data_block == 0 (bigalloc is enabled + * on modern mke2fs or blksize > 1k on older mke2fs) then we must + * compensate. + */ + if (sb->s_blocksize == 1024 && nr == 0 && + le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0) + has_super++; + + return (has_super + ext4_group_first_block_no(sb, bg)); +} + +/** + * ext4_get_stripe_size: Get the stripe size. + * @sbi: In memory super block info + * + * If we have specified it via mount option, then + * use the mount option value. If the value specified at mount time is + * greater than the blocks per group use the super block value. + * If the super block value is greater than blocks per group return 0. + * Allocator needs it be less than blocks per group. + * + */ +static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi) +{ + unsigned long stride = le16_to_cpu(sbi->s_es->s_raid_stride); + unsigned long stripe_width = + le32_to_cpu(sbi->s_es->s_raid_stripe_width); + int ret; + + if (sbi->s_stripe && sbi->s_stripe <= sbi->s_blocks_per_group) + ret = sbi->s_stripe; + else if (stripe_width <= sbi->s_blocks_per_group) + ret = stripe_width; + else if (stride <= sbi->s_blocks_per_group) + ret = stride; + else + ret = 0; + + /* + * If the stripe width is 1, this makes no sense and + * we set it to 0 to turn off stripe handling code. + */ + if (ret <= 1) + ret = 0; + + return ret; +} + +/* sysfs supprt */ + +struct ext4_attr { + struct attribute attr; + ssize_t (*show)(struct ext4_attr *, struct ext4_sb_info *, char *); + ssize_t (*store)(struct ext4_attr *, struct ext4_sb_info *, + const char *, size_t); + union { + int offset; + int deprecated_val; + } u; +}; + +static int parse_strtoull(const char *buf, + unsigned long long max, unsigned long long *value) +{ + int ret; + + ret = kstrtoull(skip_spaces(buf), 0, value); + if (!ret && *value > max) + ret = -EINVAL; + return ret; +} + +static ssize_t delayed_allocation_blocks_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, + char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%llu\n", + (s64) EXT4_C2B(sbi, + percpu_counter_sum(&sbi->s_dirtyclusters_counter))); +} + +static ssize_t session_write_kbytes_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + struct super_block *sb = sbi->s_buddy_cache->i_sb; + + if (!sb->s_bdev->bd_part) + return snprintf(buf, PAGE_SIZE, "0\n"); + return snprintf(buf, PAGE_SIZE, "%lu\n", + (part_stat_read(sb->s_bdev->bd_part, sectors[1]) - + sbi->s_sectors_written_start) >> 1); +} + +static ssize_t lifetime_write_kbytes_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + struct super_block *sb = sbi->s_buddy_cache->i_sb; + + if (!sb->s_bdev->bd_part) + return snprintf(buf, PAGE_SIZE, "0\n"); + return snprintf(buf, PAGE_SIZE, "%llu\n", + (unsigned long long)(sbi->s_kbytes_written + + ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - + EXT4_SB(sb)->s_sectors_written_start) >> 1))); +} + +static ssize_t inode_readahead_blks_store(struct ext4_attr *a, + struct ext4_sb_info *sbi, + const char *buf, size_t count) +{ + unsigned long t; + int ret; + + ret = kstrtoul(skip_spaces(buf), 0, &t); + if (ret) + return ret; + + if (t && (!is_power_of_2(t) || t > 0x40000000)) + return -EINVAL; + + sbi->s_inode_readahead_blks = t; + return count; +} + +static ssize_t sbi_ui_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset); + + return snprintf(buf, PAGE_SIZE, "%u\n", *ui); +} + +static ssize_t sbi_ui_store(struct ext4_attr *a, + struct ext4_sb_info *sbi, + const char *buf, size_t count) +{ + unsigned int *ui = (unsigned int *) (((char *) sbi) + a->u.offset); + unsigned long t; + int ret; + + ret = kstrtoul(skip_spaces(buf), 0, &t); + if (ret) + return ret; + *ui = t; + return count; +} + +static ssize_t es_ui_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + + unsigned int *ui = (unsigned int *) (((char *) sbi->s_es) + + a->u.offset); + + return snprintf(buf, PAGE_SIZE, "%u\n", *ui); +} + +static ssize_t reserved_clusters_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%llu\n", + (unsigned long long) atomic64_read(&sbi->s_resv_clusters)); +} + +static ssize_t reserved_clusters_store(struct ext4_attr *a, + struct ext4_sb_info *sbi, + const char *buf, size_t count) +{ + unsigned long long val; + int ret; + + if (parse_strtoull(buf, -1ULL, &val)) + return -EINVAL; + ret = ext4_reserve_clusters(sbi, val); + + return ret ? ret : count; +} + +static ssize_t trigger_test_error(struct ext4_attr *a, + struct ext4_sb_info *sbi, + const char *buf, size_t count) +{ + int len = count; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (len && buf[len-1] == '\n') + len--; + + if (len) + ext4_error(sbi->s_sb, "%.*s", len, buf); + return count; +} + +static ssize_t sbi_deprecated_show(struct ext4_attr *a, + struct ext4_sb_info *sbi, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", a->u.deprecated_val); +} + +#define EXT4_ATTR_OFFSET(_name,_mode,_show,_store,_elname) \ +static struct ext4_attr ext4_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode }, \ + .show = _show, \ + .store = _store, \ + .u = { \ + .offset = offsetof(struct ext4_sb_info, _elname),\ + }, \ +} + +#define EXT4_ATTR_OFFSET_ES(_name,_mode,_show,_store,_elname) \ +static struct ext4_attr ext4_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = _mode }, \ + .show = _show, \ + .store = _store, \ + .u = { \ + .offset = offsetof(struct ext4_super_block, _elname), \ + }, \ +} + +#define EXT4_ATTR(name, mode, show, store) \ +static struct ext4_attr ext4_attr_##name = __ATTR(name, mode, show, store) + +#define EXT4_INFO_ATTR(name) EXT4_ATTR(name, 0444, NULL, NULL) +#define EXT4_RO_ATTR(name) EXT4_ATTR(name, 0444, name##_show, NULL) +#define EXT4_RW_ATTR(name) EXT4_ATTR(name, 0644, name##_show, name##_store) + +#define EXT4_RO_ATTR_ES_UI(name, elname) \ + EXT4_ATTR_OFFSET_ES(name, 0444, es_ui_show, NULL, elname) +#define EXT4_RW_ATTR_SBI_UI(name, elname) \ + EXT4_ATTR_OFFSET(name, 0644, sbi_ui_show, sbi_ui_store, elname) + +#define ATTR_LIST(name) &ext4_attr_##name.attr +#define EXT4_DEPRECATED_ATTR(_name, _val) \ +static struct ext4_attr ext4_attr_##_name = { \ + .attr = {.name = __stringify(_name), .mode = 0444 }, \ + .show = sbi_deprecated_show, \ + .u = { \ + .deprecated_val = _val, \ + }, \ +} + +EXT4_RO_ATTR(delayed_allocation_blocks); +EXT4_RO_ATTR(session_write_kbytes); +EXT4_RO_ATTR(lifetime_write_kbytes); +EXT4_RW_ATTR(reserved_clusters); +EXT4_ATTR_OFFSET(inode_readahead_blks, 0644, sbi_ui_show, + inode_readahead_blks_store, s_inode_readahead_blks); +EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); +EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); +EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); +EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); +EXT4_RW_ATTR_SBI_UI(mb_order2_req, s_mb_order2_reqs); +EXT4_RW_ATTR_SBI_UI(mb_stream_req, s_mb_stream_request); +EXT4_RW_ATTR_SBI_UI(mb_group_prealloc, s_mb_group_prealloc); +EXT4_DEPRECATED_ATTR(max_writeback_mb_bump, 128); +EXT4_RW_ATTR_SBI_UI(extent_max_zeroout_kb, s_extent_max_zeroout_kb); +EXT4_ATTR(trigger_fs_error, 0200, NULL, trigger_test_error); +EXT4_RW_ATTR_SBI_UI(err_ratelimit_interval_ms, s_err_ratelimit_state.interval); +EXT4_RW_ATTR_SBI_UI(err_ratelimit_burst, s_err_ratelimit_state.burst); +EXT4_RW_ATTR_SBI_UI(warning_ratelimit_interval_ms, s_warning_ratelimit_state.interval); +EXT4_RW_ATTR_SBI_UI(warning_ratelimit_burst, s_warning_ratelimit_state.burst); +EXT4_RW_ATTR_SBI_UI(msg_ratelimit_interval_ms, s_msg_ratelimit_state.interval); +EXT4_RW_ATTR_SBI_UI(msg_ratelimit_burst, s_msg_ratelimit_state.burst); +EXT4_RO_ATTR_ES_UI(errors_count, s_error_count); +EXT4_RO_ATTR_ES_UI(first_error_time, s_first_error_time); +EXT4_RO_ATTR_ES_UI(last_error_time, s_last_error_time); + +static struct attribute *ext4_attrs[] = { + ATTR_LIST(delayed_allocation_blocks), + ATTR_LIST(session_write_kbytes), + ATTR_LIST(lifetime_write_kbytes), + ATTR_LIST(reserved_clusters), + ATTR_LIST(inode_readahead_blks), + ATTR_LIST(inode_goal), + ATTR_LIST(mb_stats), + ATTR_LIST(mb_max_to_scan), + ATTR_LIST(mb_min_to_scan), + ATTR_LIST(mb_order2_req), + ATTR_LIST(mb_stream_req), + ATTR_LIST(mb_group_prealloc), + ATTR_LIST(max_writeback_mb_bump), + ATTR_LIST(extent_max_zeroout_kb), + ATTR_LIST(trigger_fs_error), + ATTR_LIST(err_ratelimit_interval_ms), + ATTR_LIST(err_ratelimit_burst), + ATTR_LIST(warning_ratelimit_interval_ms), + ATTR_LIST(warning_ratelimit_burst), + ATTR_LIST(msg_ratelimit_interval_ms), + ATTR_LIST(msg_ratelimit_burst), + ATTR_LIST(errors_count), + ATTR_LIST(first_error_time), + ATTR_LIST(last_error_time), + NULL, +}; + +/* Features this copy of ext4 supports */ +EXT4_INFO_ATTR(lazy_itable_init); +EXT4_INFO_ATTR(batched_discard); +EXT4_INFO_ATTR(meta_bg_resize); +EXT4_INFO_ATTR(encryption); + +static struct attribute *ext4_feat_attrs[] = { + ATTR_LIST(lazy_itable_init), + ATTR_LIST(batched_discard), + ATTR_LIST(meta_bg_resize), + ATTR_LIST(encryption), + NULL, +}; + +static ssize_t ext4_attr_show(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, + s_kobj); + struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); + + return a->show ? a->show(a, sbi, buf) : 0; +} + +static ssize_t ext4_attr_store(struct kobject *kobj, + struct attribute *attr, + const char *buf, size_t len) +{ + struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, + s_kobj); + struct ext4_attr *a = container_of(attr, struct ext4_attr, attr); + + return a->store ? a->store(a, sbi, buf, len) : 0; +} + +static void ext4_sb_release(struct kobject *kobj) +{ + struct ext4_sb_info *sbi = container_of(kobj, struct ext4_sb_info, + s_kobj); + complete(&sbi->s_kobj_unregister); +} + +static const struct sysfs_ops ext4_attr_ops = { + .show = ext4_attr_show, + .store = ext4_attr_store, +}; + +static struct kobj_type ext4_ktype = { + .default_attrs = ext4_attrs, + .sysfs_ops = &ext4_attr_ops, + .release = ext4_sb_release, +}; + +static void ext4_feat_release(struct kobject *kobj) +{ + complete(&ext4_feat->f_kobj_unregister); +} + +static ssize_t ext4_feat_show(struct kobject *kobj, + struct attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "supported\n"); +} + +/* + * We can not use ext4_attr_show/store because it relies on the kobject + * being embedded in the ext4_sb_info structure which is definitely not + * true in this case. + */ +static const struct sysfs_ops ext4_feat_ops = { + .show = ext4_feat_show, + .store = NULL, +}; + +static struct kobj_type ext4_feat_ktype = { + .default_attrs = ext4_feat_attrs, + .sysfs_ops = &ext4_feat_ops, + .release = ext4_feat_release, +}; + +/* + * Check whether this filesystem can be mounted based on + * the features present and the RDONLY/RDWR mount requested. + * Returns 1 if this filesystem can be mounted as requested, + * 0 if it cannot be. + */ +static int ext4_feature_set_ok(struct super_block *sb, int readonly) +{ + if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP)) { + ext4_msg(sb, KERN_ERR, + "Couldn't mount because of " + "unsupported optional features (%x)", + (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & + ~EXT4_FEATURE_INCOMPAT_SUPP)); + return 0; + } + + if (readonly) + return 1; + + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_READONLY)) { + ext4_msg(sb, KERN_INFO, "filesystem is read-only"); + sb->s_flags |= MS_RDONLY; + return 1; + } + + /* Check that feature set is OK for a read-write mount */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP)) { + ext4_msg(sb, KERN_ERR, "couldn't mount RDWR because of " + "unsupported optional features (%x)", + (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & + ~EXT4_FEATURE_RO_COMPAT_SUPP)); + return 0; + } + /* + * Large file size enabled file system can only be mounted + * read-write on 32-bit systems if kernel is built with CONFIG_LBDAF + */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE)) { + if (sizeof(blkcnt_t) < sizeof(u64)) { + ext4_msg(sb, KERN_ERR, "Filesystem with huge files " + "cannot be mounted RDWR without " + "CONFIG_LBDAF"); + return 0; + } + } + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC) && + !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) { + ext4_msg(sb, KERN_ERR, + "Can't support bigalloc feature without " + "extents feature\n"); + return 0; + } + +#ifndef CONFIG_QUOTA + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) && + !readonly) { + ext4_msg(sb, KERN_ERR, + "Filesystem with quota feature cannot be mounted RDWR " + "without CONFIG_QUOTA"); + return 0; + } +#endif /* CONFIG_QUOTA */ + return 1; +} + +/* + * This function is called once a day if we have errors logged + * on the file system + */ +static void print_daily_error_info(unsigned long arg) +{ + struct super_block *sb = (struct super_block *) arg; + struct ext4_sb_info *sbi; + struct ext4_super_block *es; + + sbi = EXT4_SB(sb); + es = sbi->s_es; + + if (es->s_error_count) + /* fsck newer than v1.41.13 is needed to clean this condition. */ + ext4_msg(sb, KERN_NOTICE, "error count since last fsck: %u", + le32_to_cpu(es->s_error_count)); + if (es->s_first_error_time) { + printk(KERN_NOTICE "EXT4-fs (%s): initial error at time %u: %.*s:%d", + sb->s_id, le32_to_cpu(es->s_first_error_time), + (int) sizeof(es->s_first_error_func), + es->s_first_error_func, + le32_to_cpu(es->s_first_error_line)); + if (es->s_first_error_ino) + printk(": inode %u", + le32_to_cpu(es->s_first_error_ino)); + if (es->s_first_error_block) + printk(": block %llu", (unsigned long long) + le64_to_cpu(es->s_first_error_block)); + printk("\n"); + } + if (es->s_last_error_time) { + printk(KERN_NOTICE "EXT4-fs (%s): last error at time %u: %.*s:%d", + sb->s_id, le32_to_cpu(es->s_last_error_time), + (int) sizeof(es->s_last_error_func), + es->s_last_error_func, + le32_to_cpu(es->s_last_error_line)); + if (es->s_last_error_ino) + printk(": inode %u", + le32_to_cpu(es->s_last_error_ino)); + if (es->s_last_error_block) + printk(": block %llu", (unsigned long long) + le64_to_cpu(es->s_last_error_block)); + printk("\n"); + } + mod_timer(&sbi->s_err_report, jiffies + 24*60*60*HZ); /* Once a day */ +} + +/* Find next suitable group and run ext4_init_inode_table */ +static int ext4_run_li_request(struct ext4_li_request *elr) +{ + struct ext4_group_desc *gdp = NULL; + ext4_group_t group, ngroups; + struct super_block *sb; + unsigned long timeout = 0; + int ret = 0; + + sb = elr->lr_super; + ngroups = EXT4_SB(sb)->s_groups_count; + + sb_start_write(sb); + for (group = elr->lr_next_group; group < ngroups; group++) { + gdp = ext4_get_group_desc(sb, group, NULL); + if (!gdp) { + ret = 1; + break; + } + + if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) + break; + } + + if (group >= ngroups) + ret = 1; + + if (!ret) { + timeout = jiffies; + ret = ext4_init_inode_table(sb, group, + elr->lr_timeout ? 0 : 1); + if (elr->lr_timeout == 0) { + timeout = (jiffies - timeout) * + elr->lr_sbi->s_li_wait_mult; + elr->lr_timeout = timeout; + } + elr->lr_next_sched = jiffies + elr->lr_timeout; + elr->lr_next_group = group + 1; + } + sb_end_write(sb); + + return ret; +} + +/* + * Remove lr_request from the list_request and free the + * request structure. Should be called with li_list_mtx held + */ +static void ext4_remove_li_request(struct ext4_li_request *elr) +{ + struct ext4_sb_info *sbi; + + if (!elr) + return; + + sbi = elr->lr_sbi; + + list_del(&elr->lr_request); + sbi->s_li_request = NULL; + kfree(elr); +} + +static void ext4_unregister_li_request(struct super_block *sb) +{ + mutex_lock(&ext4_li_mtx); + if (!ext4_li_info) { + mutex_unlock(&ext4_li_mtx); + return; + } + + mutex_lock(&ext4_li_info->li_list_mtx); + ext4_remove_li_request(EXT4_SB(sb)->s_li_request); + mutex_unlock(&ext4_li_info->li_list_mtx); + mutex_unlock(&ext4_li_mtx); +} + +static struct task_struct *ext4_lazyinit_task; + +/* + * This is the function where ext4lazyinit thread lives. It walks + * through the request list searching for next scheduled filesystem. + * When such a fs is found, run the lazy initialization request + * (ext4_rn_li_request) and keep track of the time spend in this + * function. Based on that time we compute next schedule time of + * the request. When walking through the list is complete, compute + * next waking time and put itself into sleep. + */ +static int ext4_lazyinit_thread(void *arg) +{ + struct ext4_lazy_init *eli = (struct ext4_lazy_init *)arg; + struct list_head *pos, *n; + struct ext4_li_request *elr; + unsigned long next_wakeup, cur; + + BUG_ON(NULL == eli); + +cont_thread: + while (true) { + next_wakeup = MAX_JIFFY_OFFSET; + + mutex_lock(&eli->li_list_mtx); + if (list_empty(&eli->li_request_list)) { + mutex_unlock(&eli->li_list_mtx); + goto exit_thread; + } + + list_for_each_safe(pos, n, &eli->li_request_list) { + elr = list_entry(pos, struct ext4_li_request, + lr_request); + + if (time_after_eq(jiffies, elr->lr_next_sched)) { + if (ext4_run_li_request(elr) != 0) { + /* error, remove the lazy_init job */ + ext4_remove_li_request(elr); + continue; + } + } + + if (time_before(elr->lr_next_sched, next_wakeup)) + next_wakeup = elr->lr_next_sched; + } + mutex_unlock(&eli->li_list_mtx); + + try_to_freeze(); + + cur = jiffies; + if ((time_after_eq(cur, next_wakeup)) || + (MAX_JIFFY_OFFSET == next_wakeup)) { + cond_resched(); + continue; + } + + schedule_timeout_interruptible(next_wakeup - cur); + + if (kthread_should_stop()) { + ext4_clear_request_list(); + goto exit_thread; + } + } + +exit_thread: + /* + * It looks like the request list is empty, but we need + * to check it under the li_list_mtx lock, to prevent any + * additions into it, and of course we should lock ext4_li_mtx + * to atomically free the list and ext4_li_info, because at + * this point another ext4 filesystem could be registering + * new one. + */ + mutex_lock(&ext4_li_mtx); + mutex_lock(&eli->li_list_mtx); + if (!list_empty(&eli->li_request_list)) { + mutex_unlock(&eli->li_list_mtx); + mutex_unlock(&ext4_li_mtx); + goto cont_thread; + } + mutex_unlock(&eli->li_list_mtx); + kfree(ext4_li_info); + ext4_li_info = NULL; + mutex_unlock(&ext4_li_mtx); + + return 0; +} + +static void ext4_clear_request_list(void) +{ + struct list_head *pos, *n; + struct ext4_li_request *elr; + + mutex_lock(&ext4_li_info->li_list_mtx); + list_for_each_safe(pos, n, &ext4_li_info->li_request_list) { + elr = list_entry(pos, struct ext4_li_request, + lr_request); + ext4_remove_li_request(elr); + } + mutex_unlock(&ext4_li_info->li_list_mtx); +} + +static int ext4_run_lazyinit_thread(void) +{ + ext4_lazyinit_task = kthread_run(ext4_lazyinit_thread, + ext4_li_info, "ext4lazyinit"); + if (IS_ERR(ext4_lazyinit_task)) { + int err = PTR_ERR(ext4_lazyinit_task); + ext4_clear_request_list(); + kfree(ext4_li_info); + ext4_li_info = NULL; + printk(KERN_CRIT "EXT4-fs: error %d creating inode table " + "initialization thread\n", + err); + return err; + } + ext4_li_info->li_state |= EXT4_LAZYINIT_RUNNING; + return 0; +} + +/* + * Check whether it make sense to run itable init. thread or not. + * If there is at least one uninitialized inode table, return + * corresponding group number, else the loop goes through all + * groups and return total number of groups. + */ +static ext4_group_t ext4_has_uninit_itable(struct super_block *sb) +{ + ext4_group_t group, ngroups = EXT4_SB(sb)->s_groups_count; + struct ext4_group_desc *gdp = NULL; + + for (group = 0; group < ngroups; group++) { + gdp = ext4_get_group_desc(sb, group, NULL); + if (!gdp) + continue; + + if (!(gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_ZEROED))) + break; + } + + return group; +} + +static int ext4_li_info_new(void) +{ + struct ext4_lazy_init *eli = NULL; + + eli = kzalloc(sizeof(*eli), GFP_KERNEL); + if (!eli) + return -ENOMEM; + + INIT_LIST_HEAD(&eli->li_request_list); + mutex_init(&eli->li_list_mtx); + + eli->li_state |= EXT4_LAZYINIT_QUIT; + + ext4_li_info = eli; + + return 0; +} + +static struct ext4_li_request *ext4_li_request_new(struct super_block *sb, + ext4_group_t start) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_li_request *elr; + + elr = kzalloc(sizeof(*elr), GFP_KERNEL); + if (!elr) + return NULL; + + elr->lr_super = sb; + elr->lr_sbi = sbi; + elr->lr_next_group = start; + + /* + * Randomize first schedule time of the request to + * spread the inode table initialization requests + * better. + */ + elr->lr_next_sched = jiffies + (prandom_u32() % + (EXT4_DEF_LI_MAX_START_DELAY * HZ)); + return elr; +} + +int ext4_register_li_request(struct super_block *sb, + ext4_group_t first_not_zeroed) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_li_request *elr = NULL; + ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count; + int ret = 0; + + mutex_lock(&ext4_li_mtx); + if (sbi->s_li_request != NULL) { + /* + * Reset timeout so it can be computed again, because + * s_li_wait_mult might have changed. + */ + sbi->s_li_request->lr_timeout = 0; + goto out; + } + + if (first_not_zeroed == ngroups || + (sb->s_flags & MS_RDONLY) || + !test_opt(sb, INIT_INODE_TABLE)) + goto out; + + elr = ext4_li_request_new(sb, first_not_zeroed); + if (!elr) { + ret = -ENOMEM; + goto out; + } + + if (NULL == ext4_li_info) { + ret = ext4_li_info_new(); + if (ret) + goto out; + } + + mutex_lock(&ext4_li_info->li_list_mtx); + list_add(&elr->lr_request, &ext4_li_info->li_request_list); + mutex_unlock(&ext4_li_info->li_list_mtx); + + sbi->s_li_request = elr; + /* + * set elr to NULL here since it has been inserted to + * the request_list and the removal and free of it is + * handled by ext4_clear_request_list from now on. + */ + elr = NULL; + + if (!(ext4_li_info->li_state & EXT4_LAZYINIT_RUNNING)) { + ret = ext4_run_lazyinit_thread(); + if (ret) + goto out; + } +out: + mutex_unlock(&ext4_li_mtx); + if (ret) + kfree(elr); + return ret; +} + +/* + * We do not need to lock anything since this is called on + * module unload. + */ +static void ext4_destroy_lazyinit_thread(void) +{ + /* + * If thread exited earlier + * there's nothing to be done. + */ + if (!ext4_li_info || !ext4_lazyinit_task) + return; + + kthread_stop(ext4_lazyinit_task); +} + +static int set_journal_csum_feature_set(struct super_block *sb) +{ + int ret = 1; + int compat, incompat; + struct ext4_sb_info *sbi = EXT4_SB(sb); + + if (ext4_has_metadata_csum(sb)) { + /* journal checksum v3 */ + compat = 0; + incompat = JBD2_FEATURE_INCOMPAT_CSUM_V3; + } else { + /* journal checksum v1 */ + compat = JBD2_FEATURE_COMPAT_CHECKSUM; + incompat = 0; + } + + jbd2_journal_clear_features(sbi->s_journal, + JBD2_FEATURE_COMPAT_CHECKSUM, 0, + JBD2_FEATURE_INCOMPAT_CSUM_V3 | + JBD2_FEATURE_INCOMPAT_CSUM_V2); + if (test_opt(sb, JOURNAL_ASYNC_COMMIT)) { + ret = jbd2_journal_set_features(sbi->s_journal, + compat, 0, + JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT | + incompat); + } else if (test_opt(sb, JOURNAL_CHECKSUM)) { + ret = jbd2_journal_set_features(sbi->s_journal, + compat, 0, + incompat); + jbd2_journal_clear_features(sbi->s_journal, 0, 0, + JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); + } else { + jbd2_journal_clear_features(sbi->s_journal, 0, 0, + JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT); + } + + return ret; +} + +/* + * Note: calculating the overhead so we can be compatible with + * historical BSD practice is quite difficult in the face of + * clusters/bigalloc. This is because multiple metadata blocks from + * different block group can end up in the same allocation cluster. + * Calculating the exact overhead in the face of clustered allocation + * requires either O(all block bitmaps) in memory or O(number of block + * groups**2) in time. We will still calculate the superblock for + * older file systems --- and if we come across with a bigalloc file + * system with zero in s_overhead_clusters the estimate will be close to + * correct especially for very large cluster sizes --- but for newer + * file systems, it's better to calculate this figure once at mkfs + * time, and store it in the superblock. If the superblock value is + * present (even for non-bigalloc file systems), we will use it. + */ +static int count_overhead(struct super_block *sb, ext4_group_t grp, + char *buf) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_group_desc *gdp; + ext4_fsblk_t first_block, last_block, b; + ext4_group_t i, ngroups = ext4_get_groups_count(sb); + int s, j, count = 0; + + if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_BIGALLOC)) + return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + + sbi->s_itb_per_group + 2); + + first_block = le32_to_cpu(sbi->s_es->s_first_data_block) + + (grp * EXT4_BLOCKS_PER_GROUP(sb)); + last_block = first_block + EXT4_BLOCKS_PER_GROUP(sb) - 1; + for (i = 0; i < ngroups; i++) { + gdp = ext4_get_group_desc(sb, i, NULL); + b = ext4_block_bitmap(sb, gdp); + if (b >= first_block && b <= last_block) { + ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); + count++; + } + b = ext4_inode_bitmap(sb, gdp); + if (b >= first_block && b <= last_block) { + ext4_set_bit(EXT4_B2C(sbi, b - first_block), buf); + count++; + } + b = ext4_inode_table(sb, gdp); + if (b >= first_block && b + sbi->s_itb_per_group <= last_block) + for (j = 0; j < sbi->s_itb_per_group; j++, b++) { + int c = EXT4_B2C(sbi, b - first_block); + ext4_set_bit(c, buf); + count++; + } + if (i != grp) + continue; + s = 0; + if (ext4_bg_has_super(sb, grp)) { + ext4_set_bit(s++, buf); + count++; + } + for (j = ext4_bg_num_gdb(sb, grp); j > 0; j--) { + ext4_set_bit(EXT4_B2C(sbi, s++), buf); + count++; + } + } + if (!count) + return 0; + return EXT4_CLUSTERS_PER_GROUP(sb) - + ext4_count_free(buf, EXT4_CLUSTERS_PER_GROUP(sb) / 8); +} + +/* + * Compute the overhead and stash it in sbi->s_overhead + */ +int ext4_calculate_overhead(struct super_block *sb) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + ext4_group_t i, ngroups = ext4_get_groups_count(sb); + ext4_fsblk_t overhead = 0; + char *buf = (char *) get_zeroed_page(GFP_NOFS); + + if (!buf) + return -ENOMEM; + + /* + * Compute the overhead (FS structures). This is constant + * for a given filesystem unless the number of block groups + * changes so we cache the previous value until it does. + */ + + /* + * All of the blocks before first_data_block are overhead + */ + overhead = EXT4_B2C(sbi, le32_to_cpu(es->s_first_data_block)); + + /* + * Add the overhead found in each block group + */ + for (i = 0; i < ngroups; i++) { + int blks; + + blks = count_overhead(sb, i, buf); + overhead += blks; + if (blks) + memset(buf, 0, PAGE_SIZE); + cond_resched(); + } + /* Add the internal journal blocks as well */ + if (sbi->s_journal && !sbi->journal_bdev) + overhead += EXT4_NUM_B2C(sbi, sbi->s_journal->j_maxlen); + + sbi->s_overhead = overhead; + smp_wmb(); + free_page((unsigned long) buf); + return 0; +} + + +static ext4_fsblk_t ext4_calculate_resv_clusters(struct super_block *sb) +{ + ext4_fsblk_t resv_clusters; + + /* + * There's no need to reserve anything when we aren't using extents. + * The space estimates are exact, there are no unwritten extents, + * hole punching doesn't need new metadata... This is needed especially + * to keep ext2/3 backward compatibility. + */ + if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS)) + return 0; + /* + * By default we reserve 2% or 4096 clusters, whichever is smaller. + * This should cover the situations where we can not afford to run + * out of space like for example punch hole, or converting + * unwritten extents in delalloc path. In most cases such + * allocation would require 1, or 2 blocks, higher numbers are + * very rare. + */ + resv_clusters = ext4_blocks_count(EXT4_SB(sb)->s_es) >> + EXT4_SB(sb)->s_cluster_bits; + + do_div(resv_clusters, 50); + resv_clusters = min_t(ext4_fsblk_t, resv_clusters, 4096); + + return resv_clusters; +} + + +static int ext4_reserve_clusters(struct ext4_sb_info *sbi, ext4_fsblk_t count) +{ + ext4_fsblk_t clusters = ext4_blocks_count(sbi->s_es) >> + sbi->s_cluster_bits; + + if (count >= clusters) + return -EINVAL; + + atomic64_set(&sbi->s_resv_clusters, count); + return 0; +} + +static int ext4_fill_super(struct super_block *sb, void *data, int silent) +{ + char *orig_data = kstrdup(data, GFP_KERNEL); + struct buffer_head *bh; + struct ext4_super_block *es = NULL; + struct ext4_sb_info *sbi; + ext4_fsblk_t block; + ext4_fsblk_t sb_block = get_sb_block(&data); + ext4_fsblk_t logical_sb_block; + unsigned long offset = 0; + unsigned long journal_devnum = 0; + unsigned long def_mount_opts; + struct inode *root; + char *cp; + const char *descr; + int ret = -ENOMEM; + int blocksize, clustersize; + unsigned int db_count; + unsigned int i; + int needs_recovery, has_huge_files, has_bigalloc; + __u64 blocks_count; + int err = 0; + unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + ext4_group_t first_not_zeroed; + + sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); + if (!sbi) + goto out_free_orig; + + sbi->s_blockgroup_lock = + kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); + if (!sbi->s_blockgroup_lock) { + kfree(sbi); + goto out_free_orig; + } + sb->s_fs_info = sbi; + sbi->s_sb = sb; + sbi->s_inode_readahead_blks = EXT4_DEF_INODE_READAHEAD_BLKS; + sbi->s_sb_block = sb_block; + if (sb->s_bdev->bd_part) + sbi->s_sectors_written_start = + part_stat_read(sb->s_bdev->bd_part, sectors[1]); +#ifdef CONFIG_EXT4_FS_ENCRYPTION + /* Modes of operations for file and directory encryption. */ + sbi->s_file_encryption_mode = EXT4_ENCRYPTION_MODE_AES_256_XTS; + sbi->s_dir_encryption_mode = EXT4_ENCRYPTION_MODE_INVALID; +#endif + + /* Cleanup superblock name */ + for (cp = sb->s_id; (cp = strchr(cp, '/'));) + *cp = '!'; + + /* -EINVAL is default */ + ret = -EINVAL; + blocksize = sb_min_blocksize(sb, EXT4_MIN_BLOCK_SIZE); + if (!blocksize) { + ext4_msg(sb, KERN_ERR, "unable to set blocksize"); + goto out_fail; + } + + /* + * The ext4 superblock will not be buffer aligned for other than 1kB + * block sizes. We need to calculate the offset from buffer start. + */ + if (blocksize != EXT4_MIN_BLOCK_SIZE) { + logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; + offset = do_div(logical_sb_block, blocksize); + } else { + logical_sb_block = sb_block; + } + + if (!(bh = sb_bread_unmovable(sb, logical_sb_block))) { + ext4_msg(sb, KERN_ERR, "unable to read superblock"); + goto out_fail; + } + /* + * Note: s_es must be initialized as soon as possible because + * some ext4 macro-instructions depend on its value + */ + es = (struct ext4_super_block *) (bh->b_data + offset); + sbi->s_es = es; + sb->s_magic = le16_to_cpu(es->s_magic); + if (sb->s_magic != EXT4_SUPER_MAGIC) + goto cantfind_ext4; + sbi->s_kbytes_written = le64_to_cpu(es->s_kbytes_written); + + /* Warn if metadata_csum and gdt_csum are both set. */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && + EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) + ext4_warning(sb, "metadata_csum and uninit_bg are " + "redundant flags; please run fsck."); + + /* Check for a known checksum algorithm */ + if (!ext4_verify_csum_type(sb, es)) { + ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " + "unknown checksum algorithm."); + silent = 1; + goto cantfind_ext4; + } + + /* Load the checksum driver */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) { + sbi->s_chksum_driver = crypto_alloc_shash("crc32c", 0, 0); + if (IS_ERR(sbi->s_chksum_driver)) { + ext4_msg(sb, KERN_ERR, "Cannot load crc32c driver."); + ret = PTR_ERR(sbi->s_chksum_driver); + sbi->s_chksum_driver = NULL; + goto failed_mount; + } + } + + /* Check superblock checksum */ + if (!ext4_superblock_csum_verify(sb, es)) { + ext4_msg(sb, KERN_ERR, "VFS: Found ext4 filesystem with " + "invalid superblock checksum. Run e2fsck?"); + silent = 1; + goto cantfind_ext4; + } + + /* Precompute checksum seed for all metadata */ + if (ext4_has_metadata_csum(sb)) + sbi->s_csum_seed = ext4_chksum(sbi, ~0, es->s_uuid, + sizeof(es->s_uuid)); + + /* Set defaults before we parse the mount options */ + def_mount_opts = le32_to_cpu(es->s_default_mount_opts); + set_opt(sb, INIT_INODE_TABLE); + if (def_mount_opts & EXT4_DEFM_DEBUG) + set_opt(sb, DEBUG); + if (def_mount_opts & EXT4_DEFM_BSDGROUPS) + set_opt(sb, GRPID); + if (def_mount_opts & EXT4_DEFM_UID16) + set_opt(sb, NO_UID32); + /* xattr user namespace & acls are now defaulted on */ + set_opt(sb, XATTR_USER); +#ifdef CONFIG_EXT4_FS_POSIX_ACL + set_opt(sb, POSIX_ACL); +#endif + /* don't forget to enable journal_csum when metadata_csum is enabled. */ + if (ext4_has_metadata_csum(sb)) + set_opt(sb, JOURNAL_CHECKSUM); + + if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA) + set_opt(sb, JOURNAL_DATA); + else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_ORDERED) + set_opt(sb, ORDERED_DATA); + else if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_WBACK) + set_opt(sb, WRITEBACK_DATA); + + if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_PANIC) + set_opt(sb, ERRORS_PANIC); + else if (le16_to_cpu(sbi->s_es->s_errors) == EXT4_ERRORS_CONTINUE) + set_opt(sb, ERRORS_CONT); + else + set_opt(sb, ERRORS_RO); + /* block_validity enabled by default; disable with noblock_validity */ + set_opt(sb, BLOCK_VALIDITY); + if (def_mount_opts & EXT4_DEFM_DISCARD) + set_opt(sb, DISCARD); + + sbi->s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); + sbi->s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); + sbi->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE * HZ; + sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME; + sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME; + + if ((def_mount_opts & EXT4_DEFM_NOBARRIER) == 0) + set_opt(sb, BARRIER); + + /* + * enable delayed allocation by default + * Use -o nodelalloc to turn it off + */ + if (!IS_EXT3_SB(sb) && !IS_EXT2_SB(sb) && + ((def_mount_opts & EXT4_DEFM_NODELALLOC) == 0)) + set_opt(sb, DELALLOC); + + /* + * set default s_li_wait_mult for lazyinit, for the case there is + * no mount option specified. + */ + sbi->s_li_wait_mult = EXT4_DEF_LI_WAIT_MULT; + + if (!parse_options((char *) sbi->s_es->s_mount_opts, sb, + &journal_devnum, &journal_ioprio, 0)) { + ext4_msg(sb, KERN_WARNING, + "failed to parse options in superblock: %s", + sbi->s_es->s_mount_opts); + } + sbi->s_def_mount_opt = sbi->s_mount_opt; + if (!parse_options((char *) data, sb, &journal_devnum, + &journal_ioprio, 0)) + goto failed_mount; + + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { + printk_once(KERN_WARNING "EXT4-fs: Warning: mounting " + "with data=journal disables delayed " + "allocation and O_DIRECT support!\n"); + if (test_opt2(sb, EXPLICIT_DELALLOC)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and delalloc"); + goto failed_mount; + } + if (test_opt(sb, DIOREAD_NOLOCK)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dioread_nolock"); + goto failed_mount; + } + if (test_opt(sb, DAX)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dax"); + goto failed_mount; + } + if (test_opt(sb, DELALLOC)) + clear_opt(sb, DELALLOC); + } + + sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | + (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); + + if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV && + (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) || + EXT4_HAS_RO_COMPAT_FEATURE(sb, ~0U) || + EXT4_HAS_INCOMPAT_FEATURE(sb, ~0U))) + ext4_msg(sb, KERN_WARNING, + "feature flags set on rev 0 fs, " + "running e2fsck is recommended"); + + if (es->s_creator_os == cpu_to_le32(EXT4_OS_HURD)) { + set_opt2(sb, HURD_COMPAT); + if (EXT4_HAS_INCOMPAT_FEATURE(sb, + EXT4_FEATURE_INCOMPAT_64BIT)) { + ext4_msg(sb, KERN_ERR, + "The Hurd can't support 64-bit file systems"); + goto failed_mount; + } + } + + if (IS_EXT2_SB(sb)) { + if (ext2_feature_set_ok(sb)) + ext4_msg(sb, KERN_INFO, "mounting ext2 file system " + "using the ext4 subsystem"); + else { + ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " + "to feature incompatibilities"); + goto failed_mount; + } + } + + if (IS_EXT3_SB(sb)) { + if (ext3_feature_set_ok(sb)) + ext4_msg(sb, KERN_INFO, "mounting ext3 file system " + "using the ext4 subsystem"); + else { + ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " + "to feature incompatibilities"); + goto failed_mount; + } + } + + /* + * Check feature flags regardless of the revision level, since we + * previously didn't change the revision level when setting the flags, + * so there is a chance incompat flags are set on a rev 0 filesystem. + */ + if (!ext4_feature_set_ok(sb, (sb->s_flags & MS_RDONLY))) + goto failed_mount; + + blocksize = BLOCK_SIZE << le32_to_cpu(es->s_log_block_size); + if (blocksize < EXT4_MIN_BLOCK_SIZE || + blocksize > EXT4_MAX_BLOCK_SIZE) { + ext4_msg(sb, KERN_ERR, + "Unsupported filesystem blocksize %d", blocksize); + goto failed_mount; + } + + if (sbi->s_mount_opt & EXT4_MOUNT_DAX) { + if (blocksize != PAGE_SIZE) { + ext4_msg(sb, KERN_ERR, + "error: unsupported blocksize for dax"); + goto failed_mount; + } + if (!sb->s_bdev->bd_disk->fops->direct_access) { + ext4_msg(sb, KERN_ERR, + "error: device does not support dax"); + goto failed_mount; + } + } + + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT) && + es->s_encryption_level) { + ext4_msg(sb, KERN_ERR, "Unsupported encryption level %d", + es->s_encryption_level); + goto failed_mount; + } + + if (sb->s_blocksize != blocksize) { + /* Validate the filesystem blocksize */ + if (!sb_set_blocksize(sb, blocksize)) { + ext4_msg(sb, KERN_ERR, "bad block size %d", + blocksize); + goto failed_mount; + } + + brelse(bh); + logical_sb_block = sb_block * EXT4_MIN_BLOCK_SIZE; + offset = do_div(logical_sb_block, blocksize); + bh = sb_bread_unmovable(sb, logical_sb_block); + if (!bh) { + ext4_msg(sb, KERN_ERR, + "Can't read superblock on 2nd try"); + goto failed_mount; + } + es = (struct ext4_super_block *)(bh->b_data + offset); + sbi->s_es = es; + if (es->s_magic != cpu_to_le16(EXT4_SUPER_MAGIC)) { + ext4_msg(sb, KERN_ERR, + "Magic mismatch, very weird!"); + goto failed_mount; + } + } + + has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_HUGE_FILE); + sbi->s_bitmap_maxbytes = ext4_max_bitmap_size(sb->s_blocksize_bits, + has_huge_files); + sb->s_maxbytes = ext4_max_size(sb->s_blocksize_bits, has_huge_files); + + if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) { + sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE; + sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO; + } else { + sbi->s_inode_size = le16_to_cpu(es->s_inode_size); + sbi->s_first_ino = le32_to_cpu(es->s_first_ino); + if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) || + (!is_power_of_2(sbi->s_inode_size)) || + (sbi->s_inode_size > blocksize)) { + ext4_msg(sb, KERN_ERR, + "unsupported inode size: %d", + sbi->s_inode_size); + goto failed_mount; + } + if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) + sb->s_time_gran = 1 << (EXT4_EPOCH_BITS - 2); + } + + sbi->s_desc_size = le16_to_cpu(es->s_desc_size); + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT)) { + if (sbi->s_desc_size < EXT4_MIN_DESC_SIZE_64BIT || + sbi->s_desc_size > EXT4_MAX_DESC_SIZE || + !is_power_of_2(sbi->s_desc_size)) { + ext4_msg(sb, KERN_ERR, + "unsupported descriptor size %lu", + sbi->s_desc_size); + goto failed_mount; + } + } else + sbi->s_desc_size = EXT4_MIN_DESC_SIZE; + + sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); + sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); + if (EXT4_INODE_SIZE(sb) == 0 || EXT4_INODES_PER_GROUP(sb) == 0) + goto cantfind_ext4; + + sbi->s_inodes_per_block = blocksize / EXT4_INODE_SIZE(sb); + if (sbi->s_inodes_per_block == 0) + goto cantfind_ext4; + sbi->s_itb_per_group = sbi->s_inodes_per_group / + sbi->s_inodes_per_block; + sbi->s_desc_per_block = blocksize / EXT4_DESC_SIZE(sb); + sbi->s_sbh = bh; + sbi->s_mount_state = le16_to_cpu(es->s_state); + sbi->s_addr_per_block_bits = ilog2(EXT4_ADDR_PER_BLOCK(sb)); + sbi->s_desc_per_block_bits = ilog2(EXT4_DESC_PER_BLOCK(sb)); + + for (i = 0; i < 4; i++) + sbi->s_hash_seed[i] = le32_to_cpu(es->s_hash_seed[i]); + sbi->s_def_hash_version = es->s_def_hash_version; + if (EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) { + i = le32_to_cpu(es->s_flags); + if (i & EXT2_FLAGS_UNSIGNED_HASH) + sbi->s_hash_unsigned = 3; + else if ((i & EXT2_FLAGS_SIGNED_HASH) == 0) { +#ifdef __CHAR_UNSIGNED__ + if (!(sb->s_flags & MS_RDONLY)) + es->s_flags |= + cpu_to_le32(EXT2_FLAGS_UNSIGNED_HASH); + sbi->s_hash_unsigned = 3; +#else + if (!(sb->s_flags & MS_RDONLY)) + es->s_flags |= + cpu_to_le32(EXT2_FLAGS_SIGNED_HASH); +#endif + } + } + + /* Handle clustersize */ + clustersize = BLOCK_SIZE << le32_to_cpu(es->s_log_cluster_size); + has_bigalloc = EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_BIGALLOC); + if (has_bigalloc) { + if (clustersize < blocksize) { + ext4_msg(sb, KERN_ERR, + "cluster size (%d) smaller than " + "block size (%d)", clustersize, blocksize); + goto failed_mount; + } + sbi->s_cluster_bits = le32_to_cpu(es->s_log_cluster_size) - + le32_to_cpu(es->s_log_block_size); + sbi->s_clusters_per_group = + le32_to_cpu(es->s_clusters_per_group); + if (sbi->s_clusters_per_group > blocksize * 8) { + ext4_msg(sb, KERN_ERR, + "#clusters per group too big: %lu", + sbi->s_clusters_per_group); + goto failed_mount; + } + if (sbi->s_blocks_per_group != + (sbi->s_clusters_per_group * (clustersize / blocksize))) { + ext4_msg(sb, KERN_ERR, "blocks per group (%lu) and " + "clusters per group (%lu) inconsistent", + sbi->s_blocks_per_group, + sbi->s_clusters_per_group); + goto failed_mount; + } + } else { + if (clustersize != blocksize) { + ext4_warning(sb, "fragment/cluster size (%d) != " + "block size (%d)", clustersize, + blocksize); + clustersize = blocksize; + } + if (sbi->s_blocks_per_group > blocksize * 8) { + ext4_msg(sb, KERN_ERR, + "#blocks per group too big: %lu", + sbi->s_blocks_per_group); + goto failed_mount; + } + sbi->s_clusters_per_group = sbi->s_blocks_per_group; + sbi->s_cluster_bits = 0; + } + sbi->s_cluster_ratio = clustersize / blocksize; + + if (sbi->s_inodes_per_group > blocksize * 8) { + ext4_msg(sb, KERN_ERR, + "#inodes per group too big: %lu", + sbi->s_inodes_per_group); + goto failed_mount; + } + + /* Do we have standard group size of clustersize * 8 blocks ? */ + if (sbi->s_blocks_per_group == clustersize << 3) + set_opt2(sb, STD_GROUP_SIZE); + + /* + * Test whether we have more sectors than will fit in sector_t, + * and whether the max offset is addressable by the page cache. + */ + err = generic_check_addressable(sb->s_blocksize_bits, + ext4_blocks_count(es)); + if (err) { + ext4_msg(sb, KERN_ERR, "filesystem" + " too large to mount safely on this system"); + if (sizeof(sector_t) < 8) + ext4_msg(sb, KERN_WARNING, "CONFIG_LBDAF not enabled"); + goto failed_mount; + } + + if (EXT4_BLOCKS_PER_GROUP(sb) == 0) + goto cantfind_ext4; + + /* check blocks count against device size */ + blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; + if (blocks_count && ext4_blocks_count(es) > blocks_count) { + ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu " + "exceeds size of device (%llu blocks)", + ext4_blocks_count(es), blocks_count); + goto failed_mount; + } + + /* + * It makes no sense for the first data block to be beyond the end + * of the filesystem. + */ + if (le32_to_cpu(es->s_first_data_block) >= ext4_blocks_count(es)) { + ext4_msg(sb, KERN_WARNING, "bad geometry: first data " + "block %u is beyond end of filesystem (%llu)", + le32_to_cpu(es->s_first_data_block), + ext4_blocks_count(es)); + goto failed_mount; + } + blocks_count = (ext4_blocks_count(es) - + le32_to_cpu(es->s_first_data_block) + + EXT4_BLOCKS_PER_GROUP(sb) - 1); + do_div(blocks_count, EXT4_BLOCKS_PER_GROUP(sb)); + if (blocks_count > ((uint64_t)1<<32) - EXT4_DESC_PER_BLOCK(sb)) { + ext4_msg(sb, KERN_WARNING, "groups count too large: %u " + "(block count %llu, first data block %u, " + "blocks per group %lu)", sbi->s_groups_count, + ext4_blocks_count(es), + le32_to_cpu(es->s_first_data_block), + EXT4_BLOCKS_PER_GROUP(sb)); + goto failed_mount; + } + sbi->s_groups_count = blocks_count; + sbi->s_blockfile_groups = min_t(ext4_group_t, sbi->s_groups_count, + (EXT4_MAX_BLOCK_FILE_PHYS / EXT4_BLOCKS_PER_GROUP(sb))); + db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) / + EXT4_DESC_PER_BLOCK(sb); + sbi->s_group_desc = ext4_kvmalloc(db_count * + sizeof(struct buffer_head *), + GFP_KERNEL); + if (sbi->s_group_desc == NULL) { + ext4_msg(sb, KERN_ERR, "not enough memory"); + ret = -ENOMEM; + goto failed_mount; + } + + if (ext4_proc_root) + sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); + + if (sbi->s_proc) + proc_create_data("options", S_IRUGO, sbi->s_proc, + &ext4_seq_options_fops, sb); + + bgl_lock_init(sbi->s_blockgroup_lock); + + for (i = 0; i < db_count; i++) { + block = descriptor_loc(sb, logical_sb_block, i); + sbi->s_group_desc[i] = sb_bread_unmovable(sb, block); + if (!sbi->s_group_desc[i]) { + ext4_msg(sb, KERN_ERR, + "can't read group descriptor %d", i); + db_count = i; + goto failed_mount2; + } + } + if (!ext4_check_descriptors(sb, &first_not_zeroed)) { + ext4_msg(sb, KERN_ERR, "group descriptors corrupted!"); + goto failed_mount2; + } + + sbi->s_gdb_count = db_count; + get_random_bytes(&sbi->s_next_generation, sizeof(u32)); + spin_lock_init(&sbi->s_next_gen_lock); + + setup_timer(&sbi->s_err_report, print_daily_error_info, + (unsigned long) sb); + + /* Register extent status tree shrinker */ + if (ext4_es_register_shrinker(sbi)) + goto failed_mount3; + + sbi->s_stripe = ext4_get_stripe_size(sbi); + sbi->s_extent_max_zeroout_kb = 32; + + /* + * set up enough so that it can read an inode + */ + sb->s_op = &ext4_sops; + sb->s_export_op = &ext4_export_ops; + sb->s_xattr = ext4_xattr_handlers; +#ifdef CONFIG_QUOTA + sb->dq_op = &ext4_quota_operations; + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)) + sb->s_qcop = &dquot_quotactl_sysfile_ops; + else + sb->s_qcop = &ext4_qctl_operations; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; +#endif + memcpy(sb->s_uuid, es->s_uuid, sizeof(es->s_uuid)); + + INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */ + mutex_init(&sbi->s_orphan_lock); + + sb->s_root = NULL; + + needs_recovery = (es->s_last_orphan != 0 || + EXT4_HAS_INCOMPAT_FEATURE(sb, + EXT4_FEATURE_INCOMPAT_RECOVER)); + + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_MMP) && + !(sb->s_flags & MS_RDONLY)) + if (ext4_multi_mount_protect(sb, le64_to_cpu(es->s_mmp_block))) + goto failed_mount3a; + + /* + * The first inode we look at is the journal inode. Don't try + * root first: it may be modified in the journal! + */ + if (!test_opt(sb, NOLOAD) && + EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { + if (ext4_load_journal(sb, es, journal_devnum)) + goto failed_mount3a; + } else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) && + EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { + ext4_msg(sb, KERN_ERR, "required journal recovery " + "suppressed and not mounted read-only"); + goto failed_mount_wq; + } else { + clear_opt(sb, DATA_FLAGS); + sbi->s_journal = NULL; + needs_recovery = 0; + goto no_journal; + } + + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_64BIT) && + !jbd2_journal_set_features(EXT4_SB(sb)->s_journal, 0, 0, + JBD2_FEATURE_INCOMPAT_64BIT)) { + ext4_msg(sb, KERN_ERR, "Failed to set 64-bit journal feature"); + goto failed_mount_wq; + } + + if (!set_journal_csum_feature_set(sb)) { + ext4_msg(sb, KERN_ERR, "Failed to set journal checksum " + "feature set"); + goto failed_mount_wq; + } + + /* We have now updated the journal if required, so we can + * validate the data journaling mode. */ + switch (test_opt(sb, DATA_FLAGS)) { + case 0: + /* No mode set, assume a default based on the journal + * capabilities: ORDERED_DATA if the journal can + * cope, else JOURNAL_DATA + */ + if (jbd2_journal_check_available_features + (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) + set_opt(sb, ORDERED_DATA); + else + set_opt(sb, JOURNAL_DATA); + break; + + case EXT4_MOUNT_ORDERED_DATA: + case EXT4_MOUNT_WRITEBACK_DATA: + if (!jbd2_journal_check_available_features + (sbi->s_journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)) { + ext4_msg(sb, KERN_ERR, "Journal does not support " + "requested data journaling mode"); + goto failed_mount_wq; + } + default: + break; + } + set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); + + sbi->s_journal->j_commit_callback = ext4_journal_commit_callback; + +no_journal: + if (ext4_mballoc_ready) { + sbi->s_mb_cache = ext4_xattr_create_cache(sb->s_id); + if (!sbi->s_mb_cache) { + ext4_msg(sb, KERN_ERR, "Failed to create an mb_cache"); + goto failed_mount_wq; + } + } + + if (unlikely(sbi->s_mount_flags & EXT4_MF_TEST_DUMMY_ENCRYPTION) && + !(sb->s_flags & MS_RDONLY) && + !EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT)) { + EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT); + ext4_commit_super(sb, 1); + } + + /* + * Get the # of file system overhead blocks from the + * superblock if present. + */ + if (es->s_overhead_clusters) + sbi->s_overhead = le32_to_cpu(es->s_overhead_clusters); + else { + err = ext4_calculate_overhead(sb); + if (err) + goto failed_mount_wq; + } + + /* + * The maximum number of concurrent works can be high and + * concurrency isn't really necessary. Limit it to 1. + */ + EXT4_SB(sb)->rsv_conversion_wq = + alloc_workqueue("ext4-rsv-conversion", WQ_MEM_RECLAIM | WQ_UNBOUND, 1); + if (!EXT4_SB(sb)->rsv_conversion_wq) { + printk(KERN_ERR "EXT4-fs: failed to create workqueue\n"); + ret = -ENOMEM; + goto failed_mount4; + } + + /* + * The jbd2_journal_load will have done any necessary log recovery, + * so we can safely mount the rest of the filesystem now. + */ + + root = ext4_iget(sb, EXT4_ROOT_INO); + if (IS_ERR(root)) { + ext4_msg(sb, KERN_ERR, "get root inode failed"); + ret = PTR_ERR(root); + root = NULL; + goto failed_mount4; + } + if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { + ext4_msg(sb, KERN_ERR, "corrupt root inode, run e2fsck"); + iput(root); + goto failed_mount4; + } + sb->s_root = d_make_root(root); + if (!sb->s_root) { + ext4_msg(sb, KERN_ERR, "get root dentry failed"); + ret = -ENOMEM; + goto failed_mount4; + } + + if (ext4_setup_super(sb, es, sb->s_flags & MS_RDONLY)) + sb->s_flags |= MS_RDONLY; + + /* determine the minimum size of new large inodes, if present */ + if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) { + sbi->s_want_extra_isize = sizeof(struct ext4_inode) - + EXT4_GOOD_OLD_INODE_SIZE; + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)) { + if (sbi->s_want_extra_isize < + le16_to_cpu(es->s_want_extra_isize)) + sbi->s_want_extra_isize = + le16_to_cpu(es->s_want_extra_isize); + if (sbi->s_want_extra_isize < + le16_to_cpu(es->s_min_extra_isize)) + sbi->s_want_extra_isize = + le16_to_cpu(es->s_min_extra_isize); + } + } + /* Check if enough inode space is available */ + if (EXT4_GOOD_OLD_INODE_SIZE + sbi->s_want_extra_isize > + sbi->s_inode_size) { + sbi->s_want_extra_isize = sizeof(struct ext4_inode) - + EXT4_GOOD_OLD_INODE_SIZE; + ext4_msg(sb, KERN_INFO, "required extra inode space not" + "available"); + } + + err = ext4_reserve_clusters(sbi, ext4_calculate_resv_clusters(sb)); + if (err) { + ext4_msg(sb, KERN_ERR, "failed to reserve %llu clusters for " + "reserved pool", ext4_calculate_resv_clusters(sb)); + goto failed_mount4a; + } + + err = ext4_setup_system_zone(sb); + if (err) { + ext4_msg(sb, KERN_ERR, "failed to initialize system " + "zone (%d)", err); + goto failed_mount4a; + } + + ext4_ext_init(sb); + err = ext4_mb_init(sb); + if (err) { + ext4_msg(sb, KERN_ERR, "failed to initialize mballoc (%d)", + err); + goto failed_mount5; + } + + block = ext4_count_free_clusters(sb); + ext4_free_blocks_count_set(sbi->s_es, + EXT4_C2B(sbi, block)); + err = percpu_counter_init(&sbi->s_freeclusters_counter, block, + GFP_KERNEL); + if (!err) { + unsigned long freei = ext4_count_free_inodes(sb); + sbi->s_es->s_free_inodes_count = cpu_to_le32(freei); + err = percpu_counter_init(&sbi->s_freeinodes_counter, freei, + GFP_KERNEL); + } + if (!err) + err = percpu_counter_init(&sbi->s_dirs_counter, + ext4_count_dirs(sb), GFP_KERNEL); + if (!err) + err = percpu_counter_init(&sbi->s_dirtyclusters_counter, 0, + GFP_KERNEL); + if (err) { + ext4_msg(sb, KERN_ERR, "insufficient memory"); + goto failed_mount6; + } + + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG)) + if (!ext4_fill_flex_info(sb)) { + ext4_msg(sb, KERN_ERR, + "unable to initialize " + "flex_bg meta info!"); + goto failed_mount6; + } + + err = ext4_register_li_request(sb, first_not_zeroed); + if (err) + goto failed_mount6; + + sbi->s_kobj.kset = ext4_kset; + init_completion(&sbi->s_kobj_unregister); + err = kobject_init_and_add(&sbi->s_kobj, &ext4_ktype, NULL, + "%s", sb->s_id); + if (err) + goto failed_mount7; + +#ifdef CONFIG_QUOTA + /* Enable quota usage during mount. */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) && + !(sb->s_flags & MS_RDONLY)) { + err = ext4_enable_quotas(sb); + if (err) + goto failed_mount8; + } +#endif /* CONFIG_QUOTA */ + + EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS; + ext4_orphan_cleanup(sb, es); + EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS; + if (needs_recovery) { + ext4_msg(sb, KERN_INFO, "recovery complete"); + ext4_mark_recovery_complete(sb, es); + } + if (EXT4_SB(sb)->s_journal) { + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) + descr = " journalled data mode"; + else if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA) + descr = " ordered data mode"; + else + descr = " writeback data mode"; + } else + descr = "out journal"; + + if (test_opt(sb, DISCARD)) { + struct request_queue *q = bdev_get_queue(sb->s_bdev); + if (!blk_queue_discard(q)) + ext4_msg(sb, KERN_WARNING, + "mounting with \"discard\" option, but " + "the device does not support discard"); + } + + ext4_msg(sb, KERN_INFO, "mounted filesystem with%s. " + "Opts: %s%s%s", descr, sbi->s_es->s_mount_opts, + *sbi->s_es->s_mount_opts ? "; " : "", orig_data); + + if (es->s_error_count) + mod_timer(&sbi->s_err_report, jiffies + 300*HZ); /* 5 minutes */ + + /* Enable message ratelimiting. Default is 10 messages per 5 secs. */ + ratelimit_state_init(&sbi->s_err_ratelimit_state, 5 * HZ, 10); + ratelimit_state_init(&sbi->s_warning_ratelimit_state, 5 * HZ, 10); + ratelimit_state_init(&sbi->s_msg_ratelimit_state, 5 * HZ, 10); + + kfree(orig_data); + return 0; + +cantfind_ext4: + if (!silent) + ext4_msg(sb, KERN_ERR, "VFS: Can't find ext4 filesystem"); + goto failed_mount; + +#ifdef CONFIG_QUOTA +failed_mount8: + kobject_del(&sbi->s_kobj); +#endif +failed_mount7: + ext4_unregister_li_request(sb); +failed_mount6: + ext4_mb_release(sb); + if (sbi->s_flex_groups) + kvfree(sbi->s_flex_groups); + percpu_counter_destroy(&sbi->s_freeclusters_counter); + percpu_counter_destroy(&sbi->s_freeinodes_counter); + percpu_counter_destroy(&sbi->s_dirs_counter); + percpu_counter_destroy(&sbi->s_dirtyclusters_counter); +failed_mount5: + ext4_ext_release(sb); + ext4_release_system_zone(sb); +failed_mount4a: + dput(sb->s_root); + sb->s_root = NULL; +failed_mount4: + ext4_msg(sb, KERN_ERR, "mount failed"); + if (EXT4_SB(sb)->rsv_conversion_wq) + destroy_workqueue(EXT4_SB(sb)->rsv_conversion_wq); +failed_mount_wq: + if (sbi->s_journal) { + jbd2_journal_destroy(sbi->s_journal); + sbi->s_journal = NULL; + } +failed_mount3a: + ext4_es_unregister_shrinker(sbi); +failed_mount3: + del_timer_sync(&sbi->s_err_report); + if (sbi->s_mmp_tsk) + kthread_stop(sbi->s_mmp_tsk); +failed_mount2: + for (i = 0; i < db_count; i++) + brelse(sbi->s_group_desc[i]); + kvfree(sbi->s_group_desc); +failed_mount: + if (sbi->s_chksum_driver) + crypto_free_shash(sbi->s_chksum_driver); + if (sbi->s_proc) { + remove_proc_entry("options", sbi->s_proc); + remove_proc_entry(sb->s_id, ext4_proc_root); + } +#ifdef CONFIG_QUOTA + for (i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(sbi->s_qf_names[i]); +#endif + ext4_blkdev_remove(sbi); + brelse(bh); +out_fail: + sb->s_fs_info = NULL; + kfree(sbi->s_blockgroup_lock); + kfree(sbi); +out_free_orig: + kfree(orig_data); + return err ? err : ret; +} + +/* + * Setup any per-fs journal parameters now. We'll do this both on + * initial mount, once the journal has been initialised but before we've + * done any recovery; and again on any subsequent remount. + */ +static void ext4_init_journal_params(struct super_block *sb, journal_t *journal) +{ + struct ext4_sb_info *sbi = EXT4_SB(sb); + + journal->j_commit_interval = sbi->s_commit_interval; + journal->j_min_batch_time = sbi->s_min_batch_time; + journal->j_max_batch_time = sbi->s_max_batch_time; + + write_lock(&journal->j_state_lock); + if (test_opt(sb, BARRIER)) + journal->j_flags |= JBD2_BARRIER; + else + journal->j_flags &= ~JBD2_BARRIER; + if (test_opt(sb, DATA_ERR_ABORT)) + journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR; + else + journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR; + write_unlock(&journal->j_state_lock); +} + +static journal_t *ext4_get_journal(struct super_block *sb, + unsigned int journal_inum) +{ + struct inode *journal_inode; + journal_t *journal; + + BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); + + /* First, test for the existence of a valid inode on disk. Bad + * things happen if we iget() an unused inode, as the subsequent + * iput() will try to delete it. */ + + journal_inode = ext4_iget(sb, journal_inum); + if (IS_ERR(journal_inode)) { + ext4_msg(sb, KERN_ERR, "no journal found"); + return NULL; + } + if (!journal_inode->i_nlink) { + make_bad_inode(journal_inode); + iput(journal_inode); + ext4_msg(sb, KERN_ERR, "journal inode is deleted"); + return NULL; + } + + jbd_debug(2, "Journal inode found at %p: %lld bytes\n", + journal_inode, journal_inode->i_size); + if (!S_ISREG(journal_inode->i_mode)) { + ext4_msg(sb, KERN_ERR, "invalid journal inode"); + iput(journal_inode); + return NULL; + } + + journal = jbd2_journal_init_inode(journal_inode); + if (!journal) { + ext4_msg(sb, KERN_ERR, "Could not load journal inode"); + iput(journal_inode); + return NULL; + } + journal->j_private = sb; + ext4_init_journal_params(sb, journal); + return journal; +} + +static journal_t *ext4_get_dev_journal(struct super_block *sb, + dev_t j_dev) +{ + struct buffer_head *bh; + journal_t *journal; + ext4_fsblk_t start; + ext4_fsblk_t len; + int hblock, blocksize; + ext4_fsblk_t sb_block; + unsigned long offset; + struct ext4_super_block *es; + struct block_device *bdev; + + BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); + + bdev = ext4_blkdev_get(j_dev, sb); + if (bdev == NULL) + return NULL; + + blocksize = sb->s_blocksize; + hblock = bdev_logical_block_size(bdev); + if (blocksize < hblock) { + ext4_msg(sb, KERN_ERR, + "blocksize too small for journal device"); + goto out_bdev; + } + + sb_block = EXT4_MIN_BLOCK_SIZE / blocksize; + offset = EXT4_MIN_BLOCK_SIZE % blocksize; + set_blocksize(bdev, blocksize); + if (!(bh = __bread(bdev, sb_block, blocksize))) { + ext4_msg(sb, KERN_ERR, "couldn't read superblock of " + "external journal"); + goto out_bdev; + } + + es = (struct ext4_super_block *) (bh->b_data + offset); + if ((le16_to_cpu(es->s_magic) != EXT4_SUPER_MAGIC) || + !(le32_to_cpu(es->s_feature_incompat) & + EXT4_FEATURE_INCOMPAT_JOURNAL_DEV)) { + ext4_msg(sb, KERN_ERR, "external journal has " + "bad superblock"); + brelse(bh); + goto out_bdev; + } + + if ((le32_to_cpu(es->s_feature_ro_compat) & + EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) && + es->s_checksum != ext4_superblock_csum(sb, es)) { + ext4_msg(sb, KERN_ERR, "external journal has " + "corrupt superblock"); + brelse(bh); + goto out_bdev; + } + + if (memcmp(EXT4_SB(sb)->s_es->s_journal_uuid, es->s_uuid, 16)) { + ext4_msg(sb, KERN_ERR, "journal UUID does not match"); + brelse(bh); + goto out_bdev; + } + + len = ext4_blocks_count(es); + start = sb_block + 1; + brelse(bh); /* we're done with the superblock */ + + journal = jbd2_journal_init_dev(bdev, sb->s_bdev, + start, len, blocksize); + if (!journal) { + ext4_msg(sb, KERN_ERR, "failed to create device journal"); + goto out_bdev; + } + journal->j_private = sb; + ll_rw_block(READ | REQ_META | REQ_PRIO, 1, &journal->j_sb_buffer); + wait_on_buffer(journal->j_sb_buffer); + if (!buffer_uptodate(journal->j_sb_buffer)) { + ext4_msg(sb, KERN_ERR, "I/O error on journal device"); + goto out_journal; + } + if (be32_to_cpu(journal->j_superblock->s_nr_users) != 1) { + ext4_msg(sb, KERN_ERR, "External journal has more than one " + "user (unsupported) - %d", + be32_to_cpu(journal->j_superblock->s_nr_users)); + goto out_journal; + } + EXT4_SB(sb)->journal_bdev = bdev; + ext4_init_journal_params(sb, journal); + return journal; + +out_journal: + jbd2_journal_destroy(journal); +out_bdev: + ext4_blkdev_put(bdev); + return NULL; +} + +static int ext4_load_journal(struct super_block *sb, + struct ext4_super_block *es, + unsigned long journal_devnum) +{ + journal_t *journal; + unsigned int journal_inum = le32_to_cpu(es->s_journal_inum); + dev_t journal_dev; + int err = 0; + int really_read_only; + + BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); + + if (journal_devnum && + journal_devnum != le32_to_cpu(es->s_journal_dev)) { + ext4_msg(sb, KERN_INFO, "external journal device major/minor " + "numbers have changed"); + journal_dev = new_decode_dev(journal_devnum); + } else + journal_dev = new_decode_dev(le32_to_cpu(es->s_journal_dev)); + + really_read_only = bdev_read_only(sb->s_bdev); + + /* + * Are we loading a blank journal or performing recovery after a + * crash? For recovery, we need to check in advance whether we + * can get read-write access to the device. + */ + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) { + if (sb->s_flags & MS_RDONLY) { + ext4_msg(sb, KERN_INFO, "INFO: recovery " + "required on readonly filesystem"); + if (really_read_only) { + ext4_msg(sb, KERN_ERR, "write access " + "unavailable, cannot proceed"); + return -EROFS; + } + ext4_msg(sb, KERN_INFO, "write access will " + "be enabled during recovery"); + } + } + + if (journal_inum && journal_dev) { + ext4_msg(sb, KERN_ERR, "filesystem has both journal " + "and inode journals!"); + return -EINVAL; + } + + if (journal_inum) { + if (!(journal = ext4_get_journal(sb, journal_inum))) + return -EINVAL; + } else { + if (!(journal = ext4_get_dev_journal(sb, journal_dev))) + return -EINVAL; + } + + if (!(journal->j_flags & JBD2_BARRIER)) + ext4_msg(sb, KERN_INFO, "barriers disabled"); + + if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) + err = jbd2_journal_wipe(journal, !really_read_only); + if (!err) { + char *save = kmalloc(EXT4_S_ERR_LEN, GFP_KERNEL); + if (save) + memcpy(save, ((char *) es) + + EXT4_S_ERR_START, EXT4_S_ERR_LEN); + err = jbd2_journal_load(journal); + if (save) + memcpy(((char *) es) + EXT4_S_ERR_START, + save, EXT4_S_ERR_LEN); + kfree(save); + } + + if (err) { + ext4_msg(sb, KERN_ERR, "error loading journal"); + jbd2_journal_destroy(journal); + return err; + } + + EXT4_SB(sb)->s_journal = journal; + ext4_clear_journal_err(sb, es); + + if (!really_read_only && journal_devnum && + journal_devnum != le32_to_cpu(es->s_journal_dev)) { + es->s_journal_dev = cpu_to_le32(journal_devnum); + + /* Make sure we flush the recovery flag to disk. */ + ext4_commit_super(sb, 1); + } + + return 0; +} + +static int ext4_commit_super(struct super_block *sb, int sync) +{ + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + struct buffer_head *sbh = EXT4_SB(sb)->s_sbh; + int error = 0; + + if (!sbh) + return error; + if (buffer_write_io_error(sbh)) { + /* + * Oh, dear. A previous attempt to write the + * superblock failed. This could happen because the + * USB device was yanked out. Or it could happen to + * be a transient write error and maybe the block will + * be remapped. Nothing we can do but to retry the + * write and hope for the best. + */ + ext4_msg(sb, KERN_ERR, "previous I/O error to " + "superblock detected"); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + } + /* + * If the file system is mounted read-only, don't update the + * superblock write time. This avoids updating the superblock + * write time when we are mounting the root file system + * read/only but we need to replay the journal; at that point, + * for people who are east of GMT and who make their clock + * tick in localtime for Windows bug-for-bug compatibility, + * the clock is set in the future, and this will cause e2fsck + * to complain and force a full file system check. + */ + if (!(sb->s_flags & MS_RDONLY)) + es->s_wtime = cpu_to_le32(get_seconds()); + if (sb->s_bdev->bd_part) + es->s_kbytes_written = + cpu_to_le64(EXT4_SB(sb)->s_kbytes_written + + ((part_stat_read(sb->s_bdev->bd_part, sectors[1]) - + EXT4_SB(sb)->s_sectors_written_start) >> 1)); + else + es->s_kbytes_written = + cpu_to_le64(EXT4_SB(sb)->s_kbytes_written); + if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeclusters_counter)) + ext4_free_blocks_count_set(es, + EXT4_C2B(EXT4_SB(sb), percpu_counter_sum_positive( + &EXT4_SB(sb)->s_freeclusters_counter))); + if (percpu_counter_initialized(&EXT4_SB(sb)->s_freeinodes_counter)) + es->s_free_inodes_count = + cpu_to_le32(percpu_counter_sum_positive( + &EXT4_SB(sb)->s_freeinodes_counter)); + BUFFER_TRACE(sbh, "marking dirty"); + ext4_superblock_csum_set(sb); + mark_buffer_dirty(sbh); + if (sync) { + error = sync_dirty_buffer(sbh); + if (error) + return error; + + error = buffer_write_io_error(sbh); + if (error) { + ext4_msg(sb, KERN_ERR, "I/O error while writing " + "superblock"); + clear_buffer_write_io_error(sbh); + set_buffer_uptodate(sbh); + } + } + return error; +} + +/* + * Have we just finished recovery? If so, and if we are mounting (or + * remounting) the filesystem readonly, then we will end up with a + * consistent fs on disk. Record that fact. + */ +static void ext4_mark_recovery_complete(struct super_block *sb, + struct ext4_super_block *es) +{ + journal_t *journal = EXT4_SB(sb)->s_journal; + + if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) { + BUG_ON(journal != NULL); + return; + } + jbd2_journal_lock_updates(journal); + if (jbd2_journal_flush(journal) < 0) + goto out; + + if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) && + sb->s_flags & MS_RDONLY) { + EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); + ext4_commit_super(sb, 1); + } + +out: + jbd2_journal_unlock_updates(journal); +} + +/* + * If we are mounting (or read-write remounting) a filesystem whose journal + * has recorded an error from a previous lifetime, move that error to the + * main filesystem now. + */ +static void ext4_clear_journal_err(struct super_block *sb, + struct ext4_super_block *es) +{ + journal_t *journal; + int j_errno; + const char *errstr; + + BUG_ON(!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)); + + journal = EXT4_SB(sb)->s_journal; + + /* + * Now check for any error status which may have been recorded in the + * journal by a prior ext4_error() or ext4_abort() + */ + + j_errno = jbd2_journal_errno(journal); + if (j_errno) { + char nbuf[16]; + + errstr = ext4_decode_error(sb, j_errno, nbuf); + ext4_warning(sb, "Filesystem error recorded " + "from previous mount: %s", errstr); + ext4_warning(sb, "Marking fs in need of filesystem check."); + + EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS; + es->s_state |= cpu_to_le16(EXT4_ERROR_FS); + ext4_commit_super(sb, 1); + + jbd2_journal_clear_err(journal); + jbd2_journal_update_sb_errno(journal); + } +} + +/* + * Force the running and committing transactions to commit, + * and wait on the commit. + */ +int ext4_force_commit(struct super_block *sb) +{ + journal_t *journal; + + if (sb->s_flags & MS_RDONLY) + return 0; + + journal = EXT4_SB(sb)->s_journal; + return ext4_journal_force_commit(journal); +} + +static int ext4_sync_fs(struct super_block *sb, int wait) +{ + int ret = 0; + tid_t target; + bool needs_barrier = false; + struct ext4_sb_info *sbi = EXT4_SB(sb); + + trace_ext4_sync_fs(sb, wait); + flush_workqueue(sbi->rsv_conversion_wq); + /* + * Writeback quota in non-journalled quota case - journalled quota has + * no dirty dquots + */ + dquot_writeback_dquots(sb, -1); + /* + * Data writeback is possible w/o journal transaction, so barrier must + * being sent at the end of the function. But we can skip it if + * transaction_commit will do it for us. + */ + if (sbi->s_journal) { + target = jbd2_get_latest_transaction(sbi->s_journal); + if (wait && sbi->s_journal->j_flags & JBD2_BARRIER && + !jbd2_trans_will_send_data_barrier(sbi->s_journal, target)) + needs_barrier = true; + + if (jbd2_journal_start_commit(sbi->s_journal, &target)) { + if (wait) + ret = jbd2_log_wait_commit(sbi->s_journal, + target); + } + } else if (wait && test_opt(sb, BARRIER)) + needs_barrier = true; + if (needs_barrier) { + int err; + err = blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); + if (!ret) + ret = err; + } + + return ret; +} + +/* + * LVM calls this function before a (read-only) snapshot is created. This + * gives us a chance to flush the journal completely and mark the fs clean. + * + * Note that only this function cannot bring a filesystem to be in a clean + * state independently. It relies on upper layer to stop all data & metadata + * modifications. + */ +static int ext4_freeze(struct super_block *sb) +{ + int error = 0; + journal_t *journal; + + if (sb->s_flags & MS_RDONLY) + return 0; + + journal = EXT4_SB(sb)->s_journal; + + if (journal) { + /* Now we set up the journal barrier. */ + jbd2_journal_lock_updates(journal); + + /* + * Don't clear the needs_recovery flag if we failed to + * flush the journal. + */ + error = jbd2_journal_flush(journal); + if (error < 0) + goto out; + } + + /* Journal blocked and flushed, clear needs_recovery flag. */ + EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); + error = ext4_commit_super(sb, 1); +out: + if (journal) + /* we rely on upper layer to stop further updates */ + jbd2_journal_unlock_updates(journal); + return error; +} + +/* + * Called by LVM after the snapshot is done. We need to reset the RECOVER + * flag here, even though the filesystem is not technically dirty yet. + */ +static int ext4_unfreeze(struct super_block *sb) +{ + if (sb->s_flags & MS_RDONLY) + return 0; + + /* Reset the needs_recovery flag before the fs is unlocked. */ + EXT4_SET_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER); + ext4_commit_super(sb, 1); + return 0; +} + +/* + * Structure to save mount options for ext4_remount's benefit + */ +struct ext4_mount_options { + unsigned long s_mount_opt; + unsigned long s_mount_opt2; + kuid_t s_resuid; + kgid_t s_resgid; + unsigned long s_commit_interval; + u32 s_min_batch_time, s_max_batch_time; +#ifdef CONFIG_QUOTA + int s_jquota_fmt; + char *s_qf_names[EXT4_MAXQUOTAS]; +#endif +}; + +static int ext4_remount(struct super_block *sb, int *flags, char *data) +{ + struct ext4_super_block *es; + struct ext4_sb_info *sbi = EXT4_SB(sb); + unsigned long old_sb_flags; + struct ext4_mount_options old_opts; + int enable_quota = 0; + ext4_group_t g; + unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO; + int err = 0; +#ifdef CONFIG_QUOTA + int i, j; +#endif + char *orig_data = kstrdup(data, GFP_KERNEL); + + /* Store the original options */ + old_sb_flags = sb->s_flags; + old_opts.s_mount_opt = sbi->s_mount_opt; + old_opts.s_mount_opt2 = sbi->s_mount_opt2; + old_opts.s_resuid = sbi->s_resuid; + old_opts.s_resgid = sbi->s_resgid; + old_opts.s_commit_interval = sbi->s_commit_interval; + old_opts.s_min_batch_time = sbi->s_min_batch_time; + old_opts.s_max_batch_time = sbi->s_max_batch_time; +#ifdef CONFIG_QUOTA + old_opts.s_jquota_fmt = sbi->s_jquota_fmt; + for (i = 0; i < EXT4_MAXQUOTAS; i++) + if (sbi->s_qf_names[i]) { + old_opts.s_qf_names[i] = kstrdup(sbi->s_qf_names[i], + GFP_KERNEL); + if (!old_opts.s_qf_names[i]) { + for (j = 0; j < i; j++) + kfree(old_opts.s_qf_names[j]); + kfree(orig_data); + return -ENOMEM; + } + } else + old_opts.s_qf_names[i] = NULL; +#endif + if (sbi->s_journal && sbi->s_journal->j_task->io_context) + journal_ioprio = sbi->s_journal->j_task->io_context->ioprio; + + if (!parse_options(data, sb, NULL, &journal_ioprio, 1)) { + err = -EINVAL; + goto restore_opts; + } + + if ((old_opts.s_mount_opt & EXT4_MOUNT_JOURNAL_CHECKSUM) ^ + test_opt(sb, JOURNAL_CHECKSUM)) { + ext4_msg(sb, KERN_ERR, "changing journal_checksum " + "during remount not supported; ignoring"); + sbi->s_mount_opt ^= EXT4_MOUNT_JOURNAL_CHECKSUM; + } + + if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) { + if (test_opt2(sb, EXPLICIT_DELALLOC)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and delalloc"); + err = -EINVAL; + goto restore_opts; + } + if (test_opt(sb, DIOREAD_NOLOCK)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dioread_nolock"); + err = -EINVAL; + goto restore_opts; + } + if (test_opt(sb, DAX)) { + ext4_msg(sb, KERN_ERR, "can't mount with " + "both data=journal and dax"); + err = -EINVAL; + goto restore_opts; + } + } + + if ((sbi->s_mount_opt ^ old_opts.s_mount_opt) & EXT4_MOUNT_DAX) { + ext4_msg(sb, KERN_WARNING, "warning: refusing change of " + "dax flag with busy inodes while remounting"); + sbi->s_mount_opt ^= EXT4_MOUNT_DAX; + } + + if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) + ext4_abort(sb, "Abort forced by user"); + + sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | + (test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0); + + es = sbi->s_es; + + if (sbi->s_journal) { + ext4_init_journal_params(sb, sbi->s_journal); + set_task_ioprio(sbi->s_journal->j_task, journal_ioprio); + } + + if (*flags & MS_LAZYTIME) + sb->s_flags |= MS_LAZYTIME; + + if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) { + if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED) { + err = -EROFS; + goto restore_opts; + } + + if (*flags & MS_RDONLY) { + err = sync_filesystem(sb); + if (err < 0) + goto restore_opts; + err = dquot_suspend(sb, -1); + if (err < 0) + goto restore_opts; + + /* + * First of all, the unconditional stuff we have to do + * to disable replay of the journal when we next remount + */ + sb->s_flags |= MS_RDONLY; + + /* + * OK, test if we are remounting a valid rw partition + * readonly, and if so set the rdonly flag and then + * mark the partition as valid again. + */ + if (!(es->s_state & cpu_to_le16(EXT4_VALID_FS)) && + (sbi->s_mount_state & EXT4_VALID_FS)) + es->s_state = cpu_to_le16(sbi->s_mount_state); + + if (sbi->s_journal) + ext4_mark_recovery_complete(sb, es); + } else { + /* Make sure we can mount this feature set readwrite */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_READONLY) || + !ext4_feature_set_ok(sb, 0)) { + err = -EROFS; + goto restore_opts; + } + /* + * Make sure the group descriptor checksums + * are sane. If they aren't, refuse to remount r/w. + */ + for (g = 0; g < sbi->s_groups_count; g++) { + struct ext4_group_desc *gdp = + ext4_get_group_desc(sb, g, NULL); + + if (!ext4_group_desc_csum_verify(sb, g, gdp)) { + ext4_msg(sb, KERN_ERR, + "ext4_remount: Checksum for group %u failed (%u!=%u)", + g, le16_to_cpu(ext4_group_desc_csum(sbi, g, gdp)), + le16_to_cpu(gdp->bg_checksum)); + err = -EINVAL; + goto restore_opts; + } + } + + /* + * If we have an unprocessed orphan list hanging + * around from a previously readonly bdev mount, + * require a full umount/remount for now. + */ + if (es->s_last_orphan) { + ext4_msg(sb, KERN_WARNING, "Couldn't " + "remount RDWR because of unprocessed " + "orphan inode list. Please " + "umount/remount instead"); + err = -EINVAL; + goto restore_opts; + } + + /* + * Mounting a RDONLY partition read-write, so reread + * and store the current valid flag. (It may have + * been changed by e2fsck since we originally mounted + * the partition.) + */ + if (sbi->s_journal) + ext4_clear_journal_err(sb, es); + sbi->s_mount_state = le16_to_cpu(es->s_state); + if (!ext4_setup_super(sb, es, 0)) + sb->s_flags &= ~MS_RDONLY; + if (EXT4_HAS_INCOMPAT_FEATURE(sb, + EXT4_FEATURE_INCOMPAT_MMP)) + if (ext4_multi_mount_protect(sb, + le64_to_cpu(es->s_mmp_block))) { + err = -EROFS; + goto restore_opts; + } + enable_quota = 1; + } + } + + /* + * Reinitialize lazy itable initialization thread based on + * current settings + */ + if ((sb->s_flags & MS_RDONLY) || !test_opt(sb, INIT_INODE_TABLE)) + ext4_unregister_li_request(sb); + else { + ext4_group_t first_not_zeroed; + first_not_zeroed = ext4_has_uninit_itable(sb); + ext4_register_li_request(sb, first_not_zeroed); + } + + ext4_setup_system_zone(sb); + if (sbi->s_journal == NULL && !(old_sb_flags & MS_RDONLY)) + ext4_commit_super(sb, 1); + +#ifdef CONFIG_QUOTA + /* Release old quota file names */ + for (i = 0; i < EXT4_MAXQUOTAS; i++) + kfree(old_opts.s_qf_names[i]); + if (enable_quota) { + if (sb_any_quota_suspended(sb)) + dquot_resume(sb, -1); + else if (EXT4_HAS_RO_COMPAT_FEATURE(sb, + EXT4_FEATURE_RO_COMPAT_QUOTA)) { + err = ext4_enable_quotas(sb); + if (err) + goto restore_opts; + } + } +#endif + + *flags = (*flags & ~MS_LAZYTIME) | (sb->s_flags & MS_LAZYTIME); + ext4_msg(sb, KERN_INFO, "re-mounted. Opts: %s", orig_data); + kfree(orig_data); + return 0; + +restore_opts: + sb->s_flags = old_sb_flags; + sbi->s_mount_opt = old_opts.s_mount_opt; + sbi->s_mount_opt2 = old_opts.s_mount_opt2; + sbi->s_resuid = old_opts.s_resuid; + sbi->s_resgid = old_opts.s_resgid; + sbi->s_commit_interval = old_opts.s_commit_interval; + sbi->s_min_batch_time = old_opts.s_min_batch_time; + sbi->s_max_batch_time = old_opts.s_max_batch_time; +#ifdef CONFIG_QUOTA + sbi->s_jquota_fmt = old_opts.s_jquota_fmt; + for (i = 0; i < EXT4_MAXQUOTAS; i++) { + kfree(sbi->s_qf_names[i]); + sbi->s_qf_names[i] = old_opts.s_qf_names[i]; + } +#endif + kfree(orig_data); + return err; +} + +static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + struct ext4_sb_info *sbi = EXT4_SB(sb); + struct ext4_super_block *es = sbi->s_es; + ext4_fsblk_t overhead = 0, resv_blocks; + u64 fsid; + s64 bfree; + resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters)); + + if (!test_opt(sb, MINIX_DF)) + overhead = sbi->s_overhead; + + buf->f_type = EXT4_SUPER_MAGIC; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = ext4_blocks_count(es) - EXT4_C2B(sbi, overhead); + bfree = percpu_counter_sum_positive(&sbi->s_freeclusters_counter) - + percpu_counter_sum_positive(&sbi->s_dirtyclusters_counter); + /* prevent underflow in case that few free space is available */ + buf->f_bfree = EXT4_C2B(sbi, max_t(s64, bfree, 0)); + buf->f_bavail = buf->f_bfree - + (ext4_r_blocks_count(es) + resv_blocks); + if (buf->f_bfree < (ext4_r_blocks_count(es) + resv_blocks)) + buf->f_bavail = 0; + buf->f_files = le32_to_cpu(es->s_inodes_count); + buf->f_ffree = percpu_counter_sum_positive(&sbi->s_freeinodes_counter); + buf->f_namelen = EXT4_NAME_LEN; + fsid = le64_to_cpup((void *)es->s_uuid) ^ + le64_to_cpup((void *)es->s_uuid + sizeof(u64)); + buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; + buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; + + return 0; +} + +/* Helper function for writing quotas on sync - we need to start transaction + * before quota file is locked for write. Otherwise the are possible deadlocks: + * Process 1 Process 2 + * ext4_create() quota_sync() + * jbd2_journal_start() write_dquot() + * dquot_initialize() down(dqio_mutex) + * down(dqio_mutex) jbd2_journal_start() + * + */ + +#ifdef CONFIG_QUOTA + +static inline struct inode *dquot_to_inode(struct dquot *dquot) +{ + return sb_dqopt(dquot->dq_sb)->files[dquot->dq_id.type]; +} + +static int ext4_write_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + struct inode *inode; + + inode = dquot_to_inode(dquot); + handle = ext4_journal_start(inode, EXT4_HT_QUOTA, + EXT4_QUOTA_TRANS_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_commit(dquot); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext4_acquire_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + + handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, + EXT4_QUOTA_INIT_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_acquire(dquot); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext4_release_dquot(struct dquot *dquot) +{ + int ret, err; + handle_t *handle; + + handle = ext4_journal_start(dquot_to_inode(dquot), EXT4_HT_QUOTA, + EXT4_QUOTA_DEL_BLOCKS(dquot->dq_sb)); + if (IS_ERR(handle)) { + /* Release dquot anyway to avoid endless cycle in dqput() */ + dquot_release(dquot); + return PTR_ERR(handle); + } + ret = dquot_release(dquot); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +static int ext4_mark_dquot_dirty(struct dquot *dquot) +{ + struct super_block *sb = dquot->dq_sb; + struct ext4_sb_info *sbi = EXT4_SB(sb); + + /* Are we journaling quotas? */ + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA) || + sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]) { + dquot_mark_dquot_dirty(dquot); + return ext4_write_dquot(dquot); + } else { + return dquot_mark_dquot_dirty(dquot); + } +} + +static int ext4_write_info(struct super_block *sb, int type) +{ + int ret, err; + handle_t *handle; + + /* Data block + inode block */ + handle = ext4_journal_start(d_inode(sb->s_root), EXT4_HT_QUOTA, 2); + if (IS_ERR(handle)) + return PTR_ERR(handle); + ret = dquot_commit_info(sb, type); + err = ext4_journal_stop(handle); + if (!ret) + ret = err; + return ret; +} + +/* + * Turn on quotas during mount time - we need to find + * the quota file and such... + */ +static int ext4_quota_on_mount(struct super_block *sb, int type) +{ + return dquot_quota_on_mount(sb, EXT4_SB(sb)->s_qf_names[type], + EXT4_SB(sb)->s_jquota_fmt, type); +} + +/* + * Standard function to be called on quota_on + */ +static int ext4_quota_on(struct super_block *sb, int type, int format_id, + struct path *path) +{ + int err; + + if (!test_opt(sb, QUOTA)) + return -EINVAL; + + /* Quotafile not on the same filesystem? */ + if (path->dentry->d_sb != sb) + return -EXDEV; + /* Journaling quota? */ + if (EXT4_SB(sb)->s_qf_names[type]) { + /* Quotafile not in fs root? */ + if (path->dentry->d_parent != sb->s_root) + ext4_msg(sb, KERN_WARNING, + "Quota file not on filesystem root. " + "Journaled quota will not work"); + } + + /* + * When we journal data on quota file, we have to flush journal to see + * all updates to the file when we bypass pagecache... + */ + if (EXT4_SB(sb)->s_journal && + ext4_should_journal_data(d_inode(path->dentry))) { + /* + * We don't need to lock updates but journal_flush() could + * otherwise be livelocked... + */ + jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); + err = jbd2_journal_flush(EXT4_SB(sb)->s_journal); + jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); + if (err) + return err; + } + + return dquot_quota_on(sb, type, format_id, path); +} + +static int ext4_quota_enable(struct super_block *sb, int type, int format_id, + unsigned int flags) +{ + int err; + struct inode *qf_inode; + unsigned long qf_inums[EXT4_MAXQUOTAS] = { + le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), + le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum) + }; + + BUG_ON(!EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_QUOTA)); + + if (!qf_inums[type]) + return -EPERM; + + qf_inode = ext4_iget(sb, qf_inums[type]); + if (IS_ERR(qf_inode)) { + ext4_error(sb, "Bad quota inode # %lu", qf_inums[type]); + return PTR_ERR(qf_inode); + } + + /* Don't account quota for quota files to avoid recursion */ + qf_inode->i_flags |= S_NOQUOTA; + err = dquot_enable(qf_inode, type, format_id, flags); + iput(qf_inode); + + return err; +} + +/* Enable usage tracking for all quota types. */ +static int ext4_enable_quotas(struct super_block *sb) +{ + int type, err = 0; + unsigned long qf_inums[EXT4_MAXQUOTAS] = { + le32_to_cpu(EXT4_SB(sb)->s_es->s_usr_quota_inum), + le32_to_cpu(EXT4_SB(sb)->s_es->s_grp_quota_inum) + }; + + sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; + for (type = 0; type < EXT4_MAXQUOTAS; type++) { + if (qf_inums[type]) { + err = ext4_quota_enable(sb, type, QFMT_VFS_V1, + DQUOT_USAGE_ENABLED); + if (err) { + ext4_warning(sb, + "Failed to enable quota tracking " + "(type=%d, err=%d). Please run " + "e2fsck to fix.", type, err); + return err; + } + } + } + return 0; +} + +static int ext4_quota_off(struct super_block *sb, int type) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + handle_t *handle; + + /* Force all delayed allocation blocks to be allocated. + * Caller already holds s_umount sem */ + if (test_opt(sb, DELALLOC)) + sync_filesystem(sb); + + if (!inode) + goto out; + + /* Update modification times of quota files when userspace can + * start looking at them */ + handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 1); + if (IS_ERR(handle)) + goto out; + inode->i_mtime = inode->i_ctime = CURRENT_TIME; + ext4_mark_inode_dirty(handle, inode); + ext4_journal_stop(handle); + +out: + return dquot_quota_off(sb, type); +} + +/* Read data from quotafile - avoid pagecache and such because we cannot afford + * acquiring the locks... As quota files are never truncated and quota code + * itself serializes the operations (and no one else should touch the files) + * we don't have to be afraid of races */ +static ssize_t ext4_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); + int offset = off & (sb->s_blocksize - 1); + int tocopy; + size_t toread; + struct buffer_head *bh; + loff_t i_size = i_size_read(inode); + + if (off > i_size) + return 0; + if (off+len > i_size) + len = i_size-off; + toread = len; + while (toread > 0) { + tocopy = sb->s_blocksize - offset < toread ? + sb->s_blocksize - offset : toread; + bh = ext4_bread(NULL, inode, blk, 0); + if (IS_ERR(bh)) + return PTR_ERR(bh); + if (!bh) /* A hole? */ + memset(data, 0, tocopy); + else + memcpy(data, bh->b_data+offset, tocopy); + brelse(bh); + offset = 0; + toread -= tocopy; + data += tocopy; + blk++; + } + return len; +} + +/* Write to quotafile (we know the transaction is already started and has + * enough credits) */ +static ssize_t ext4_quota_write(struct super_block *sb, int type, + const char *data, size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + ext4_lblk_t blk = off >> EXT4_BLOCK_SIZE_BITS(sb); + int err, offset = off & (sb->s_blocksize - 1); + struct buffer_head *bh; + handle_t *handle = journal_current_handle(); + + if (EXT4_SB(sb)->s_journal && !handle) { + ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" + " cancelled because transaction is not started", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + /* + * Since we account only one data block in transaction credits, + * then it is impossible to cross a block boundary. + */ + if (sb->s_blocksize - offset < len) { + ext4_msg(sb, KERN_WARNING, "Quota write (off=%llu, len=%llu)" + " cancelled because not block aligned", + (unsigned long long)off, (unsigned long long)len); + return -EIO; + } + + bh = ext4_bread(handle, inode, blk, 1); + if (IS_ERR(bh)) + return PTR_ERR(bh); + if (!bh) + goto out; + BUFFER_TRACE(bh, "get write access"); + err = ext4_journal_get_write_access(handle, bh); + if (err) { + brelse(bh); + return err; + } + lock_buffer(bh); + memcpy(bh->b_data+offset, data, len); + flush_dcache_page(bh->b_page); + unlock_buffer(bh); + err = ext4_handle_dirty_metadata(handle, NULL, bh); + brelse(bh); +out: + if (inode->i_size < off + len) { + i_size_write(inode, off + len); + EXT4_I(inode)->i_disksize = inode->i_size; + ext4_mark_inode_dirty(handle, inode); + } + return len; +} + +#endif + +static struct dentry *ext4_mount(struct file_system_type *fs_type, int flags, + const char *dev_name, void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, ext4_fill_super); +} + +#if !defined(CONFIG_EXT2_FS) && !defined(CONFIG_EXT2_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) +static inline void register_as_ext2(void) +{ + int err = register_filesystem(&ext2_fs_type); + if (err) + printk(KERN_WARNING + "EXT4-fs: Unable to register as ext2 (%d)\n", err); +} + +static inline void unregister_as_ext2(void) +{ + unregister_filesystem(&ext2_fs_type); +} + +static inline int ext2_feature_set_ok(struct super_block *sb) +{ + if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP)) + return 0; + if (sb->s_flags & MS_RDONLY) + return 1; + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP)) + return 0; + return 1; +} +#else +static inline void register_as_ext2(void) { } +static inline void unregister_as_ext2(void) { } +static inline int ext2_feature_set_ok(struct super_block *sb) { return 0; } +#endif + +#if !defined(CONFIG_EXT3_FS) && !defined(CONFIG_EXT3_FS_MODULE) && defined(CONFIG_EXT4_USE_FOR_EXT23) +static inline void register_as_ext3(void) +{ + int err = register_filesystem(&ext3_fs_type); + if (err) + printk(KERN_WARNING + "EXT4-fs: Unable to register as ext3 (%d)\n", err); +} + +static inline void unregister_as_ext3(void) +{ + unregister_filesystem(&ext3_fs_type); +} + +static inline int ext3_feature_set_ok(struct super_block *sb) +{ + if (EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT3_FEATURE_INCOMPAT_SUPP)) + return 0; + if (!EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) + return 0; + if (sb->s_flags & MS_RDONLY) + return 1; + if (EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT3_FEATURE_RO_COMPAT_SUPP)) + return 0; + return 1; +} +#else +static inline void register_as_ext3(void) { } +static inline void unregister_as_ext3(void) { } +static inline int ext3_feature_set_ok(struct super_block *sb) { return 0; } +#endif + +static struct file_system_type ext4_fs_type = { + .owner = THIS_MODULE, + .name = "ext4", + .mount = ext4_mount, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("ext4"); + +static int __init ext4_init_feat_adverts(void) +{ + struct ext4_features *ef; + int ret = -ENOMEM; + + ef = kzalloc(sizeof(struct ext4_features), GFP_KERNEL); + if (!ef) + goto out; + + ef->f_kobj.kset = ext4_kset; + init_completion(&ef->f_kobj_unregister); + ret = kobject_init_and_add(&ef->f_kobj, &ext4_feat_ktype, NULL, + "features"); + if (ret) { + kfree(ef); + goto out; + } + + ext4_feat = ef; + ret = 0; +out: + return ret; +} + +static void ext4_exit_feat_adverts(void) +{ + kobject_put(&ext4_feat->f_kobj); + wait_for_completion(&ext4_feat->f_kobj_unregister); + kfree(ext4_feat); +} + +/* Shared across all ext4 file systems */ +wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ]; +struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ]; + +static int __init ext4_init_fs(void) +{ + int i, err; + + ext4_li_info = NULL; + mutex_init(&ext4_li_mtx); + + /* Build-time check for flags consistency */ + ext4_check_flag_values(); + + for (i = 0; i < EXT4_WQ_HASH_SZ; i++) { + mutex_init(&ext4__aio_mutex[i]); + init_waitqueue_head(&ext4__ioend_wq[i]); + } + + err = ext4_init_es(); + if (err) + return err; + + err = ext4_init_pageio(); + if (err) + goto out7; + + err = ext4_init_system_zone(); + if (err) + goto out6; + ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj); + if (!ext4_kset) { + err = -ENOMEM; + goto out5; + } + ext4_proc_root = proc_mkdir("fs/ext4", NULL); + + err = ext4_init_feat_adverts(); + if (err) + goto out4; + + err = ext4_init_mballoc(); + if (err) + goto out2; + else + ext4_mballoc_ready = 1; + err = init_inodecache(); + if (err) + goto out1; + register_as_ext3(); + register_as_ext2(); + err = register_filesystem(&ext4_fs_type); + if (err) + goto out; + + return 0; +out: + unregister_as_ext2(); + unregister_as_ext3(); + destroy_inodecache(); +out1: + ext4_mballoc_ready = 0; + ext4_exit_mballoc(); +out2: + ext4_exit_feat_adverts(); +out4: + if (ext4_proc_root) + remove_proc_entry("fs/ext4", NULL); + kset_unregister(ext4_kset); +out5: + ext4_exit_system_zone(); +out6: + ext4_exit_pageio(); +out7: + ext4_exit_es(); + + return err; +} + +static void __exit ext4_exit_fs(void) +{ + ext4_destroy_lazyinit_thread(); + unregister_as_ext2(); + unregister_as_ext3(); + unregister_filesystem(&ext4_fs_type); + destroy_inodecache(); + ext4_exit_mballoc(); + ext4_exit_feat_adverts(); + remove_proc_entry("fs/ext4", NULL); + kset_unregister(ext4_kset); + ext4_exit_system_zone(); + ext4_exit_pageio(); + ext4_exit_es(); +} + +MODULE_AUTHOR("Remy Card, Stephen Tweedie, Andrew Morton, Andreas Dilger, Theodore Ts'o and others"); +MODULE_DESCRIPTION("Fourth Extended Filesystem"); +MODULE_LICENSE("GPL"); +module_init(ext4_init_fs) +module_exit(ext4_exit_fs) |