diff options
Diffstat (limited to 'fs/jfs/super.c')
| -rw-r--r-- | fs/jfs/super.c | 1012 |
1 files changed, 1012 insertions, 0 deletions
diff --git a/fs/jfs/super.c b/fs/jfs/super.c new file mode 100644 index 000000000..4cd9798f4 --- /dev/null +++ b/fs/jfs/super.c @@ -0,0 +1,1012 @@ +/* + * Copyright (C) International Business Machines Corp., 2000-2004 + * Portions Copyright (C) Christoph Hellwig, 2001-2002 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See + * the GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/parser.h> +#include <linux/completion.h> +#include <linux/vfs.h> +#include <linux/quotaops.h> +#include <linux/mount.h> +#include <linux/moduleparam.h> +#include <linux/kthread.h> +#include <linux/posix_acl.h> +#include <linux/buffer_head.h> +#include <linux/exportfs.h> +#include <linux/crc32.h> +#include <linux/slab.h> +#include <asm/uaccess.h> +#include <linux/seq_file.h> +#include <linux/blkdev.h> + +#include "jfs_incore.h" +#include "jfs_filsys.h" +#include "jfs_inode.h" +#include "jfs_metapage.h" +#include "jfs_superblock.h" +#include "jfs_dmap.h" +#include "jfs_imap.h" +#include "jfs_acl.h" +#include "jfs_debug.h" +#include "jfs_xattr.h" + +MODULE_DESCRIPTION("The Journaled Filesystem (JFS)"); +MODULE_AUTHOR("Steve Best/Dave Kleikamp/Barry Arndt, IBM"); +MODULE_LICENSE("GPL"); + +static struct kmem_cache *jfs_inode_cachep; + +static const struct super_operations jfs_super_operations; +static const struct export_operations jfs_export_operations; +static struct file_system_type jfs_fs_type; + +#define MAX_COMMIT_THREADS 64 +static int commit_threads; +module_param(commit_threads, int, 0); +MODULE_PARM_DESC(commit_threads, "Number of commit threads"); + +static struct task_struct *jfsCommitThread[MAX_COMMIT_THREADS]; +struct task_struct *jfsIOthread; +struct task_struct *jfsSyncThread; + +#ifdef CONFIG_JFS_DEBUG +int jfsloglevel = JFS_LOGLEVEL_WARN; +module_param(jfsloglevel, int, 0644); +MODULE_PARM_DESC(jfsloglevel, "Specify JFS loglevel (0, 1 or 2)"); +#endif + +static void jfs_handle_error(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + + if (sb->s_flags & MS_RDONLY) + return; + + updateSuper(sb, FM_DIRTY); + + if (sbi->flag & JFS_ERR_PANIC) + panic("JFS (device %s): panic forced after error\n", + sb->s_id); + else if (sbi->flag & JFS_ERR_REMOUNT_RO) { + jfs_err("ERROR: (device %s): remounting filesystem as read-only\n", + sb->s_id); + sb->s_flags |= MS_RDONLY; + } + + /* nothing is done for continue beyond marking the superblock dirty */ +} + +void jfs_error(struct super_block *sb, const char *fmt, ...) +{ + struct va_format vaf; + va_list args; + + va_start(args, fmt); + + vaf.fmt = fmt; + vaf.va = &args; + + pr_err("ERROR: (device %s): %ps: %pV\n", + sb->s_id, __builtin_return_address(0), &vaf); + + va_end(args); + + jfs_handle_error(sb); +} + +static struct inode *jfs_alloc_inode(struct super_block *sb) +{ + struct jfs_inode_info *jfs_inode; + + jfs_inode = kmem_cache_alloc(jfs_inode_cachep, GFP_NOFS); + if (!jfs_inode) + return NULL; +#ifdef CONFIG_QUOTA + memset(&jfs_inode->i_dquot, 0, sizeof(jfs_inode->i_dquot)); +#endif + return &jfs_inode->vfs_inode; +} + +static void jfs_i_callback(struct rcu_head *head) +{ + struct inode *inode = container_of(head, struct inode, i_rcu); + struct jfs_inode_info *ji = JFS_IP(inode); + kmem_cache_free(jfs_inode_cachep, ji); +} + +static void jfs_destroy_inode(struct inode *inode) +{ + struct jfs_inode_info *ji = JFS_IP(inode); + + BUG_ON(!list_empty(&ji->anon_inode_list)); + + spin_lock_irq(&ji->ag_lock); + if (ji->active_ag != -1) { + struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; + atomic_dec(&bmap->db_active[ji->active_ag]); + ji->active_ag = -1; + } + spin_unlock_irq(&ji->ag_lock); + call_rcu(&inode->i_rcu, jfs_i_callback); +} + +static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct jfs_sb_info *sbi = JFS_SBI(dentry->d_sb); + s64 maxinodes; + struct inomap *imap = JFS_IP(sbi->ipimap)->i_imap; + + jfs_info("In jfs_statfs"); + buf->f_type = JFS_SUPER_MAGIC; + buf->f_bsize = sbi->bsize; + buf->f_blocks = sbi->bmap->db_mapsize; + buf->f_bfree = sbi->bmap->db_nfree; + buf->f_bavail = sbi->bmap->db_nfree; + /* + * If we really return the number of allocated & free inodes, some + * applications will fail because they won't see enough free inodes. + * We'll try to calculate some guess as to how many inodes we can + * really allocate + * + * buf->f_files = atomic_read(&imap->im_numinos); + * buf->f_ffree = atomic_read(&imap->im_numfree); + */ + maxinodes = min((s64) atomic_read(&imap->im_numinos) + + ((sbi->bmap->db_nfree >> imap->im_l2nbperiext) + << L2INOSPEREXT), (s64) 0xffffffffLL); + buf->f_files = maxinodes; + buf->f_ffree = maxinodes - (atomic_read(&imap->im_numinos) - + atomic_read(&imap->im_numfree)); + buf->f_fsid.val[0] = (u32)crc32_le(0, sbi->uuid, sizeof(sbi->uuid)/2); + buf->f_fsid.val[1] = (u32)crc32_le(0, sbi->uuid + sizeof(sbi->uuid)/2, + sizeof(sbi->uuid)/2); + + buf->f_namelen = JFS_NAME_MAX; + return 0; +} + +static void jfs_put_super(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + int rc; + + jfs_info("In jfs_put_super"); + + dquot_disable(sb, -1, DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED); + + rc = jfs_umount(sb); + if (rc) + jfs_err("jfs_umount failed with return code %d", rc); + + unload_nls(sbi->nls_tab); + + truncate_inode_pages(sbi->direct_inode->i_mapping, 0); + iput(sbi->direct_inode); + + kfree(sbi); +} + +enum { + Opt_integrity, Opt_nointegrity, Opt_iocharset, Opt_resize, + Opt_resize_nosize, Opt_errors, Opt_ignore, Opt_err, Opt_quota, + Opt_usrquota, Opt_grpquota, Opt_uid, Opt_gid, Opt_umask, + Opt_discard, Opt_nodiscard, Opt_discard_minblk +}; + +static const match_table_t tokens = { + {Opt_integrity, "integrity"}, + {Opt_nointegrity, "nointegrity"}, + {Opt_iocharset, "iocharset=%s"}, + {Opt_resize, "resize=%u"}, + {Opt_resize_nosize, "resize"}, + {Opt_errors, "errors=%s"}, + {Opt_ignore, "noquota"}, + {Opt_ignore, "quota"}, + {Opt_usrquota, "usrquota"}, + {Opt_grpquota, "grpquota"}, + {Opt_uid, "uid=%u"}, + {Opt_gid, "gid=%u"}, + {Opt_umask, "umask=%u"}, + {Opt_discard, "discard"}, + {Opt_nodiscard, "nodiscard"}, + {Opt_discard_minblk, "discard=%u"}, + {Opt_err, NULL} +}; + +static int parse_options(char *options, struct super_block *sb, s64 *newLVSize, + int *flag) +{ + void *nls_map = (void *)-1; /* -1: no change; NULL: none */ + char *p; + struct jfs_sb_info *sbi = JFS_SBI(sb); + + *newLVSize = 0; + + if (!options) + return 1; + + while ((p = strsep(&options, ",")) != NULL) { + substring_t args[MAX_OPT_ARGS]; + int token; + if (!*p) + continue; + + token = match_token(p, tokens, args); + switch (token) { + case Opt_integrity: + *flag &= ~JFS_NOINTEGRITY; + break; + case Opt_nointegrity: + *flag |= JFS_NOINTEGRITY; + break; + case Opt_ignore: + /* Silently ignore the quota options */ + /* Don't do anything ;-) */ + break; + case Opt_iocharset: + if (nls_map && nls_map != (void *) -1) + unload_nls(nls_map); + if (!strcmp(args[0].from, "none")) + nls_map = NULL; + else { + nls_map = load_nls(args[0].from); + if (!nls_map) { + pr_err("JFS: charset not found\n"); + goto cleanup; + } + } + break; + case Opt_resize: + { + char *resize = args[0].from; + int rc = kstrtoll(resize, 0, newLVSize); + + if (rc) + goto cleanup; + break; + } + case Opt_resize_nosize: + { + *newLVSize = sb->s_bdev->bd_inode->i_size >> + sb->s_blocksize_bits; + if (*newLVSize == 0) + pr_err("JFS: Cannot determine volume size\n"); + break; + } + case Opt_errors: + { + char *errors = args[0].from; + if (!errors || !*errors) + goto cleanup; + if (!strcmp(errors, "continue")) { + *flag &= ~JFS_ERR_REMOUNT_RO; + *flag &= ~JFS_ERR_PANIC; + *flag |= JFS_ERR_CONTINUE; + } else if (!strcmp(errors, "remount-ro")) { + *flag &= ~JFS_ERR_CONTINUE; + *flag &= ~JFS_ERR_PANIC; + *flag |= JFS_ERR_REMOUNT_RO; + } else if (!strcmp(errors, "panic")) { + *flag &= ~JFS_ERR_CONTINUE; + *flag &= ~JFS_ERR_REMOUNT_RO; + *flag |= JFS_ERR_PANIC; + } else { + pr_err("JFS: %s is an invalid error handler\n", + errors); + goto cleanup; + } + break; + } + +#ifdef CONFIG_QUOTA + case Opt_quota: + case Opt_usrquota: + *flag |= JFS_USRQUOTA; + break; + case Opt_grpquota: + *flag |= JFS_GRPQUOTA; + break; +#else + case Opt_usrquota: + case Opt_grpquota: + case Opt_quota: + pr_err("JFS: quota operations not supported\n"); + break; +#endif + case Opt_uid: + { + char *uid = args[0].from; + uid_t val; + int rc = kstrtouint(uid, 0, &val); + + if (rc) + goto cleanup; + sbi->uid = make_kuid(current_user_ns(), val); + if (!uid_valid(sbi->uid)) + goto cleanup; + break; + } + + case Opt_gid: + { + char *gid = args[0].from; + gid_t val; + int rc = kstrtouint(gid, 0, &val); + + if (rc) + goto cleanup; + sbi->gid = make_kgid(current_user_ns(), val); + if (!gid_valid(sbi->gid)) + goto cleanup; + break; + } + + case Opt_umask: + { + char *umask = args[0].from; + int rc = kstrtouint(umask, 8, &sbi->umask); + + if (rc) + goto cleanup; + if (sbi->umask & ~0777) { + pr_err("JFS: Invalid value of umask\n"); + goto cleanup; + } + break; + } + + case Opt_discard: + { + struct request_queue *q = bdev_get_queue(sb->s_bdev); + /* if set to 1, even copying files will cause + * trimming :O + * -> user has more control over the online trimming + */ + sbi->minblks_trim = 64; + if (blk_queue_discard(q)) + *flag |= JFS_DISCARD; + else + pr_err("JFS: discard option not supported on device\n"); + break; + } + + case Opt_nodiscard: + *flag &= ~JFS_DISCARD; + break; + + case Opt_discard_minblk: + { + struct request_queue *q = bdev_get_queue(sb->s_bdev); + char *minblks_trim = args[0].from; + int rc; + if (blk_queue_discard(q)) { + *flag |= JFS_DISCARD; + rc = kstrtouint(minblks_trim, 0, + &sbi->minblks_trim); + if (rc) + goto cleanup; + } else + pr_err("JFS: discard option not supported on device\n"); + break; + } + + default: + printk("jfs: Unrecognized mount option \"%s\" or missing value\n", + p); + goto cleanup; + } + } + + if (nls_map != (void *) -1) { + /* Discard old (if remount) */ + unload_nls(sbi->nls_tab); + sbi->nls_tab = nls_map; + } + return 1; + +cleanup: + if (nls_map && nls_map != (void *) -1) + unload_nls(nls_map); + return 0; +} + +static int jfs_remount(struct super_block *sb, int *flags, char *data) +{ + s64 newLVSize = 0; + int rc = 0; + int flag = JFS_SBI(sb)->flag; + int ret; + + sync_filesystem(sb); + if (!parse_options(data, sb, &newLVSize, &flag)) + return -EINVAL; + + if (newLVSize) { + if (sb->s_flags & MS_RDONLY) { + pr_err("JFS: resize requires volume to be mounted read-write\n"); + return -EROFS; + } + rc = jfs_extendfs(sb, newLVSize, 0); + if (rc) + return rc; + } + + if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { + /* + * Invalidate any previously read metadata. fsck may have + * changed the on-disk data since we mounted r/o + */ + truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); + + JFS_SBI(sb)->flag = flag; + ret = jfs_mount_rw(sb, 1); + + /* mark the fs r/w for quota activity */ + sb->s_flags &= ~MS_RDONLY; + + dquot_resume(sb, -1); + return ret; + } + if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { + rc = dquot_suspend(sb, -1); + if (rc < 0) + return rc; + rc = jfs_umount_rw(sb); + JFS_SBI(sb)->flag = flag; + return rc; + } + if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) + if (!(sb->s_flags & MS_RDONLY)) { + rc = jfs_umount_rw(sb); + if (rc) + return rc; + + JFS_SBI(sb)->flag = flag; + ret = jfs_mount_rw(sb, 1); + return ret; + } + JFS_SBI(sb)->flag = flag; + + return 0; +} + +static int jfs_fill_super(struct super_block *sb, void *data, int silent) +{ + struct jfs_sb_info *sbi; + struct inode *inode; + int rc; + s64 newLVSize = 0; + int flag, ret = -EINVAL; + + jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags); + + if (!new_valid_dev(sb->s_bdev->bd_dev)) + return -EOVERFLOW; + + sbi = kzalloc(sizeof(struct jfs_sb_info), GFP_KERNEL); + if (!sbi) + return -ENOMEM; + + sb->s_fs_info = sbi; + sb->s_max_links = JFS_LINK_MAX; + sbi->sb = sb; + sbi->uid = INVALID_UID; + sbi->gid = INVALID_GID; + sbi->umask = -1; + + /* initialize the mount flag and determine the default error handler */ + flag = JFS_ERR_REMOUNT_RO; + + if (!parse_options((char *) data, sb, &newLVSize, &flag)) + goto out_kfree; + sbi->flag = flag; + +#ifdef CONFIG_JFS_POSIX_ACL + sb->s_flags |= MS_POSIXACL; +#endif + + if (newLVSize) { + pr_err("resize option for remount only\n"); + goto out_kfree; + } + + /* + * Initialize blocksize to 4K. + */ + sb_set_blocksize(sb, PSIZE); + + /* + * Set method vectors. + */ + sb->s_op = &jfs_super_operations; + sb->s_export_op = &jfs_export_operations; + sb->s_xattr = jfs_xattr_handlers; +#ifdef CONFIG_QUOTA + sb->dq_op = &dquot_operations; + sb->s_qcop = &dquot_quotactl_ops; + sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; +#endif + + /* + * Initialize direct-mapping inode/address-space + */ + inode = new_inode(sb); + if (inode == NULL) { + ret = -ENOMEM; + goto out_unload; + } + inode->i_ino = 0; + inode->i_size = sb->s_bdev->bd_inode->i_size; + inode->i_mapping->a_ops = &jfs_metapage_aops; + hlist_add_fake(&inode->i_hash); + mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); + + sbi->direct_inode = inode; + + rc = jfs_mount(sb); + if (rc) { + if (!silent) + jfs_err("jfs_mount failed w/return code = %d", rc); + goto out_mount_failed; + } + if (sb->s_flags & MS_RDONLY) + sbi->log = NULL; + else { + rc = jfs_mount_rw(sb, 0); + if (rc) { + if (!silent) { + jfs_err("jfs_mount_rw failed, return code = %d", + rc); + } + goto out_no_rw; + } + } + + sb->s_magic = JFS_SUPER_MAGIC; + + if (sbi->mntflag & JFS_OS2) + sb->s_d_op = &jfs_ci_dentry_operations; + + inode = jfs_iget(sb, ROOT_I); + if (IS_ERR(inode)) { + ret = PTR_ERR(inode); + goto out_no_rw; + } + sb->s_root = d_make_root(inode); + if (!sb->s_root) + goto out_no_root; + + /* logical blocks are represented by 40 bits in pxd_t, etc. */ + sb->s_maxbytes = ((u64) sb->s_blocksize) << 40; +#if BITS_PER_LONG == 32 + /* + * Page cache is indexed by long. + * I would use MAX_LFS_FILESIZE, but it's only half as big + */ + sb->s_maxbytes = min(((u64) PAGE_CACHE_SIZE << 32) - 1, + (u64)sb->s_maxbytes); +#endif + sb->s_time_gran = 1; + return 0; + +out_no_root: + jfs_err("jfs_read_super: get root dentry failed"); + +out_no_rw: + rc = jfs_umount(sb); + if (rc) + jfs_err("jfs_umount failed with return code %d", rc); +out_mount_failed: + filemap_write_and_wait(sbi->direct_inode->i_mapping); + truncate_inode_pages(sbi->direct_inode->i_mapping, 0); + make_bad_inode(sbi->direct_inode); + iput(sbi->direct_inode); + sbi->direct_inode = NULL; +out_unload: + unload_nls(sbi->nls_tab); +out_kfree: + kfree(sbi); + return ret; +} + +static int jfs_freeze(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + struct jfs_log *log = sbi->log; + int rc = 0; + + if (!(sb->s_flags & MS_RDONLY)) { + txQuiesce(sb); + rc = lmLogShutdown(log); + if (rc) { + jfs_error(sb, "lmLogShutdown failed\n"); + + /* let operations fail rather than hang */ + txResume(sb); + + return rc; + } + rc = updateSuper(sb, FM_CLEAN); + if (rc) { + jfs_err("jfs_freeze: updateSuper failed\n"); + /* + * Don't fail here. Everything succeeded except + * marking the superblock clean, so there's really + * no harm in leaving it frozen for now. + */ + } + } + return 0; +} + +static int jfs_unfreeze(struct super_block *sb) +{ + struct jfs_sb_info *sbi = JFS_SBI(sb); + struct jfs_log *log = sbi->log; + int rc = 0; + + if (!(sb->s_flags & MS_RDONLY)) { + rc = updateSuper(sb, FM_MOUNT); + if (rc) { + jfs_error(sb, "updateSuper failed\n"); + goto out; + } + rc = lmLogInit(log); + if (rc) + jfs_error(sb, "lmLogInit failed\n"); +out: + txResume(sb); + } + return rc; +} + +static struct dentry *jfs_do_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, jfs_fill_super); +} + +static int jfs_sync_fs(struct super_block *sb, int wait) +{ + struct jfs_log *log = JFS_SBI(sb)->log; + + /* log == NULL indicates read-only mount */ + if (log) { + /* + * Write quota structures to quota file, sync_blockdev() will + * write them to disk later + */ + dquot_writeback_dquots(sb, -1); + jfs_flush_journal(log, wait); + jfs_syncpt(log, 0); + } + + return 0; +} + +static int jfs_show_options(struct seq_file *seq, struct dentry *root) +{ + struct jfs_sb_info *sbi = JFS_SBI(root->d_sb); + + if (uid_valid(sbi->uid)) + seq_printf(seq, ",uid=%d", from_kuid(&init_user_ns, sbi->uid)); + if (gid_valid(sbi->gid)) + seq_printf(seq, ",gid=%d", from_kgid(&init_user_ns, sbi->gid)); + if (sbi->umask != -1) + seq_printf(seq, ",umask=%03o", sbi->umask); + if (sbi->flag & JFS_NOINTEGRITY) + seq_puts(seq, ",nointegrity"); + if (sbi->flag & JFS_DISCARD) + seq_printf(seq, ",discard=%u", sbi->minblks_trim); + if (sbi->nls_tab) + seq_printf(seq, ",iocharset=%s", sbi->nls_tab->charset); + if (sbi->flag & JFS_ERR_CONTINUE) + seq_printf(seq, ",errors=continue"); + if (sbi->flag & JFS_ERR_PANIC) + seq_printf(seq, ",errors=panic"); + +#ifdef CONFIG_QUOTA + if (sbi->flag & JFS_USRQUOTA) + seq_puts(seq, ",usrquota"); + + if (sbi->flag & JFS_GRPQUOTA) + seq_puts(seq, ",grpquota"); +#endif + + return 0; +} + +#ifdef CONFIG_QUOTA + +/* 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 jfs_quota_read(struct super_block *sb, int type, char *data, + size_t len, loff_t off) +{ + struct inode *inode = sb_dqopt(sb)->files[type]; + sector_t blk = off >> sb->s_blocksize_bits; + int err = 0; + int offset = off & (sb->s_blocksize - 1); + int tocopy; + size_t toread; + struct buffer_head tmp_bh; + 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; + + tmp_bh.b_state = 0; + tmp_bh.b_size = 1 << inode->i_blkbits; + err = jfs_get_block(inode, blk, &tmp_bh, 0); + if (err) + return err; + if (!buffer_mapped(&tmp_bh)) /* A hole? */ + memset(data, 0, tocopy); + else { + bh = sb_bread(sb, tmp_bh.b_blocknr); + if (!bh) + return -EIO; + memcpy(data, bh->b_data+offset, tocopy); + brelse(bh); + } + offset = 0; + toread -= tocopy; + data += tocopy; + blk++; + } + return len; +} + +/* Write to quotafile */ +static ssize_t jfs_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]; + sector_t blk = off >> sb->s_blocksize_bits; + int err = 0; + int offset = off & (sb->s_blocksize - 1); + int tocopy; + size_t towrite = len; + struct buffer_head tmp_bh; + struct buffer_head *bh; + + mutex_lock(&inode->i_mutex); + while (towrite > 0) { + tocopy = sb->s_blocksize - offset < towrite ? + sb->s_blocksize - offset : towrite; + + tmp_bh.b_state = 0; + tmp_bh.b_size = 1 << inode->i_blkbits; + err = jfs_get_block(inode, blk, &tmp_bh, 1); + if (err) + goto out; + if (offset || tocopy != sb->s_blocksize) + bh = sb_bread(sb, tmp_bh.b_blocknr); + else + bh = sb_getblk(sb, tmp_bh.b_blocknr); + if (!bh) { + err = -EIO; + goto out; + } + lock_buffer(bh); + memcpy(bh->b_data+offset, data, tocopy); + flush_dcache_page(bh->b_page); + set_buffer_uptodate(bh); + mark_buffer_dirty(bh); + unlock_buffer(bh); + brelse(bh); + offset = 0; + towrite -= tocopy; + data += tocopy; + blk++; + } +out: + if (len == towrite) { + mutex_unlock(&inode->i_mutex); + return err; + } + if (inode->i_size < off+len-towrite) + i_size_write(inode, off+len-towrite); + inode->i_version++; + inode->i_mtime = inode->i_ctime = CURRENT_TIME; + mark_inode_dirty(inode); + mutex_unlock(&inode->i_mutex); + return len - towrite; +} + +static struct dquot **jfs_get_dquots(struct inode *inode) +{ + return JFS_IP(inode)->i_dquot; +} +#endif + +static const struct super_operations jfs_super_operations = { + .alloc_inode = jfs_alloc_inode, + .destroy_inode = jfs_destroy_inode, + .dirty_inode = jfs_dirty_inode, + .write_inode = jfs_write_inode, + .evict_inode = jfs_evict_inode, + .put_super = jfs_put_super, + .sync_fs = jfs_sync_fs, + .freeze_fs = jfs_freeze, + .unfreeze_fs = jfs_unfreeze, + .statfs = jfs_statfs, + .remount_fs = jfs_remount, + .show_options = jfs_show_options, +#ifdef CONFIG_QUOTA + .quota_read = jfs_quota_read, + .quota_write = jfs_quota_write, + .get_dquots = jfs_get_dquots, +#endif +}; + +static const struct export_operations jfs_export_operations = { + .fh_to_dentry = jfs_fh_to_dentry, + .fh_to_parent = jfs_fh_to_parent, + .get_parent = jfs_get_parent, +}; + +static struct file_system_type jfs_fs_type = { + .owner = THIS_MODULE, + .name = "jfs", + .mount = jfs_do_mount, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("jfs"); + +static void init_once(void *foo) +{ + struct jfs_inode_info *jfs_ip = (struct jfs_inode_info *) foo; + + memset(jfs_ip, 0, sizeof(struct jfs_inode_info)); + INIT_LIST_HEAD(&jfs_ip->anon_inode_list); + init_rwsem(&jfs_ip->rdwrlock); + mutex_init(&jfs_ip->commit_mutex); + init_rwsem(&jfs_ip->xattr_sem); + spin_lock_init(&jfs_ip->ag_lock); + jfs_ip->active_ag = -1; + inode_init_once(&jfs_ip->vfs_inode); +} + +static int __init init_jfs_fs(void) +{ + int i; + int rc; + + jfs_inode_cachep = + kmem_cache_create("jfs_ip", sizeof(struct jfs_inode_info), 0, + SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, + init_once); + if (jfs_inode_cachep == NULL) + return -ENOMEM; + + /* + * Metapage initialization + */ + rc = metapage_init(); + if (rc) { + jfs_err("metapage_init failed w/rc = %d", rc); + goto free_slab; + } + + /* + * Transaction Manager initialization + */ + rc = txInit(); + if (rc) { + jfs_err("txInit failed w/rc = %d", rc); + goto free_metapage; + } + + /* + * I/O completion thread (endio) + */ + jfsIOthread = kthread_run(jfsIOWait, NULL, "jfsIO"); + if (IS_ERR(jfsIOthread)) { + rc = PTR_ERR(jfsIOthread); + jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); + goto end_txmngr; + } + + if (commit_threads < 1) + commit_threads = num_online_cpus(); + if (commit_threads > MAX_COMMIT_THREADS) + commit_threads = MAX_COMMIT_THREADS; + + for (i = 0; i < commit_threads; i++) { + jfsCommitThread[i] = kthread_run(jfs_lazycommit, NULL, + "jfsCommit"); + if (IS_ERR(jfsCommitThread[i])) { + rc = PTR_ERR(jfsCommitThread[i]); + jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); + commit_threads = i; + goto kill_committask; + } + } + + jfsSyncThread = kthread_run(jfs_sync, NULL, "jfsSync"); + if (IS_ERR(jfsSyncThread)) { + rc = PTR_ERR(jfsSyncThread); + jfs_err("init_jfs_fs: fork failed w/rc = %d", rc); + goto kill_committask; + } + +#ifdef PROC_FS_JFS + jfs_proc_init(); +#endif + + rc = register_filesystem(&jfs_fs_type); + if (!rc) + return 0; + +#ifdef PROC_FS_JFS + jfs_proc_clean(); +#endif + kthread_stop(jfsSyncThread); +kill_committask: + for (i = 0; i < commit_threads; i++) + kthread_stop(jfsCommitThread[i]); + kthread_stop(jfsIOthread); +end_txmngr: + txExit(); +free_metapage: + metapage_exit(); +free_slab: + kmem_cache_destroy(jfs_inode_cachep); + return rc; +} + +static void __exit exit_jfs_fs(void) +{ + int i; + + jfs_info("exit_jfs_fs called"); + + txExit(); + metapage_exit(); + + kthread_stop(jfsIOthread); + for (i = 0; i < commit_threads; i++) + kthread_stop(jfsCommitThread[i]); + kthread_stop(jfsSyncThread); +#ifdef PROC_FS_JFS + jfs_proc_clean(); +#endif + unregister_filesystem(&jfs_fs_type); + + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(jfs_inode_cachep); +} + +module_init(init_jfs_fs) +module_exit(exit_jfs_fs) |