diff options
Diffstat (limited to 'fs/exfat/exfat_super.c')
| -rw-r--r-- | fs/exfat/exfat_super.c | 2600 |
1 files changed, 2600 insertions, 0 deletions
diff --git a/fs/exfat/exfat_super.c b/fs/exfat/exfat_super.c new file mode 100644 index 000000000..a003a7212 --- /dev/null +++ b/fs/exfat/exfat_super.c @@ -0,0 +1,2600 @@ +/* Some of the source code in this file came from "linux/fs/fat/file.c","linux/fs/fat/inode.c" and "linux/fs/fat/misc.c". */ +/* + * linux/fs/fat/file.c + * + * Written 1992,1993 by Werner Almesberger + * + * regular file handling primitives for fat-based filesystems + */ + +/* + * linux/fs/fat/inode.c + * + * Written 1992,1993 by Werner Almesberger + * VFAT extensions by Gordon Chaffee, merged with msdos fs by Henrik Storner + * Rewritten for the constant inumbers support by Al Viro + * + * Fixes: + * + * Max Cohan: Fixed invalid FSINFO offset when info_sector is 0 + */ + +/* + * linux/fs/fat/misc.c + * + * Written 1992,1993 by Werner Almesberger + * 22/11/2000 - Fixed fat_date_unix2dos for dates earlier than 01/01/1980 + * and date_dos2unix for date==0 by Igor Zhbanov(bsg@uniyar.ac.ru) + */ + +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include <linux/version.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/time.h> +#include <linux/slab.h> +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) +#include <linux/smp_lock.h> +#endif +#include <linux/seq_file.h> +#include <linux/pagemap.h> +#include <linux/mpage.h> +#include <linux/buffer_head.h> +#include <linux/exportfs.h> +#include <linux/mount.h> +#include <linux/vfs.h> +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0) +#include <linux/aio.h> +#endif +#include <linux/parser.h> +#include <linux/uio.h> +#include <linux/writeback.h> +#include <linux/log2.h> +#include <linux/hash.h> +#include <linux/backing-dev.h> +#include <linux/sched.h> +#include <linux/fs_struct.h> +#include <linux/namei.h> +#include <asm/current.h> +#include <asm/unaligned.h> + +#include "exfat_version.h" +#include "exfat_config.h" +#include "exfat_data.h" +#include "exfat_oal.h" + +#include "exfat_blkdev.h" +#include "exfat_cache.h" +#include "exfat_nls.h" +#include "exfat_api.h" +#include "exfat_core.h" + +#include "exfat_super.h" + +static struct kmem_cache *exfat_inode_cachep; + +static int exfat_default_codepage = CONFIG_EXFAT_DEFAULT_CODEPAGE; +static char exfat_default_iocharset[] = CONFIG_EXFAT_DEFAULT_IOCHARSET; + +extern struct timezone sys_tz; + +#define CHECK_ERR(x) BUG_ON(x) + +#define UNIX_SECS_1980 315532800L + +#if BITS_PER_LONG == 64 +#define UNIX_SECS_2108 4354819200L +#endif +/* days between 1.1.70 and 1.1.80 (2 leap days) */ +#define DAYS_DELTA_DECADE (365 * 10 + 2) +/* 120 (2100 - 1980) isn't leap year */ +#define NO_LEAP_YEAR_2100 (120) +#define IS_LEAP_YEAR(y) (!((y) & 0x3) && (y) != NO_LEAP_YEAR_2100) + +#define SECS_PER_MIN (60) +#define SECS_PER_HOUR (60 * SECS_PER_MIN) +#define SECS_PER_DAY (24 * SECS_PER_HOUR) + +#define MAKE_LEAP_YEAR(leap_year, year) \ + do { \ + if (unlikely(year > NO_LEAP_YEAR_2100)) \ + leap_year = ((year + 3) / 4) - 1; \ + else \ + leap_year = ((year + 3) / 4); \ + } while (0) + +/* Linear day numbers of the respective 1sts in non-leap years. */ +static time_t accum_days_in_year[] = { + /* Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec */ + 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, +}; + +static void _exfat_truncate(struct inode *inode, loff_t old_size); + +/* Convert a FAT time/date pair to a UNIX date (seconds since 1 1 70). */ +void exfat_time_fat2unix(struct exfat_sb_info *sbi, struct timespec *ts, + DATE_TIME_T *tp) +{ + time_t year = tp->Year; + time_t ld; + + MAKE_LEAP_YEAR(ld, year); + + if (IS_LEAP_YEAR(year) && (tp->Month) > 2) + ld++; + + ts->tv_sec = tp->Second + tp->Minute * SECS_PER_MIN + + tp->Hour * SECS_PER_HOUR + + (year * 365 + ld + accum_days_in_year[(tp->Month)] + (tp->Day - 1) + DAYS_DELTA_DECADE) * SECS_PER_DAY + + sys_tz.tz_minuteswest * SECS_PER_MIN; + ts->tv_nsec = 0; +} + +/* Convert linear UNIX date to a FAT time/date pair. */ +void exfat_time_unix2fat(struct exfat_sb_info *sbi, struct timespec *ts, + DATE_TIME_T *tp) +{ + time_t second = ts->tv_sec; + time_t day, month, year; + time_t ld; + + second -= sys_tz.tz_minuteswest * SECS_PER_MIN; + + /* Jan 1 GMT 00:00:00 1980. But what about another time zone? */ + if (second < UNIX_SECS_1980) { + tp->Second = 0; + tp->Minute = 0; + tp->Hour = 0; + tp->Day = 1; + tp->Month = 1; + tp->Year = 0; + return; + } +#if (BITS_PER_LONG == 64) + if (second >= UNIX_SECS_2108) { + tp->Second = 59; + tp->Minute = 59; + tp->Hour = 23; + tp->Day = 31; + tp->Month = 12; + tp->Year = 127; + return; + } +#endif + day = second / SECS_PER_DAY - DAYS_DELTA_DECADE; + year = day / 365; + MAKE_LEAP_YEAR(ld, year); + if (year * 365 + ld > day) + year--; + + MAKE_LEAP_YEAR(ld, year); + day -= year * 365 + ld; + + if (IS_LEAP_YEAR(year) && day == accum_days_in_year[3]) { + month = 2; + } else { + if (IS_LEAP_YEAR(year) && day > accum_days_in_year[3]) + day--; + for (month = 1; month < 12; month++) { + if (accum_days_in_year[month + 1] > day) + break; + } + } + day -= accum_days_in_year[month]; + + tp->Second = second % SECS_PER_MIN; + tp->Minute = (second / SECS_PER_MIN) % 60; + tp->Hour = (second / SECS_PER_HOUR) % 24; + tp->Day = day + 1; + tp->Month = month; + tp->Year = year; +} + +static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +static int exfat_generic_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg); +#else +static long exfat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); +#endif +static int exfat_sync_inode(struct inode *inode); +static struct inode *exfat_build_inode(struct super_block *sb, FILE_ID_T *fid, loff_t i_pos); +static void exfat_detach(struct inode *inode); +static void exfat_attach(struct inode *inode, loff_t i_pos); +static inline unsigned long exfat_hash(loff_t i_pos); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34) +static int exfat_write_inode(struct inode *inode, int wait); +#else +static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc); +#endif +static void exfat_write_super(struct super_block *sb); + +static void __lock_super(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + lock_super(sb); +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + mutex_lock(&sbi->s_lock); +#endif +} + +static void __unlock_super(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + unlock_super(sb); +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + mutex_unlock(&sbi->s_lock); +#endif +} + +static int __is_sb_dirty(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + return sb->s_dirt; +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + return sbi->s_dirt; +#endif +} + +static void __set_sb_clean(struct super_block *sb) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + sb->s_dirt = 0; +#else + struct exfat_sb_info *sbi = EXFAT_SB(sb); + sbi->s_dirt = 0; +#endif +} + +static int __exfat_revalidate(struct dentry *dentry) +{ + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static int exfat_revalidate(struct dentry *dentry, unsigned int flags) +#else +static int exfat_revalidate(struct dentry *dentry, struct nameidata *nd) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) + if (flags & LOOKUP_RCU) + return -ECHILD; +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00) + if (nd && nd->flags & LOOKUP_RCU) + return -ECHILD; +#endif + + if (dentry->d_inode) + return 1; + return __exfat_revalidate(dentry); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static int exfat_revalidate_ci(struct dentry *dentry, unsigned int flags) +#else +static int exfat_revalidate_ci(struct dentry *dentry, struct nameidata *nd) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) + if (flags & LOOKUP_RCU) + return -ECHILD; +#else + unsigned int flags; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00) + if (nd && nd->flags & LOOKUP_RCU) + return -ECHILD; +#endif + + flags = nd ? nd->flags : 0; +#endif + + if (dentry->d_inode) + return 1; + + if (!flags) + return 0; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,00) + if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) + return 0; +#else + if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) { + if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) + return 0; + } +#endif + + return __exfat_revalidate(dentry); +} + +static unsigned int __exfat_striptail_len(unsigned int len, const char *name) +{ + while (len && name[len - 1] == '.') + len--; + return len; +} + +static unsigned int exfat_striptail_len(const struct qstr *qstr) +{ + return __exfat_striptail_len(qstr->len, qstr->name); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_d_hash(const struct dentry *dentry, struct qstr *qstr) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_d_hash(struct dentry *dentry, struct qstr *qstr) +#else +static int exfat_d_hash(const struct dentry *dentry, const struct inode *inode, + struct qstr *qstr) +#endif +{ + qstr->hash = full_name_hash(qstr->name, exfat_striptail_len(qstr)); + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_d_hashi(const struct dentry *dentry, struct qstr *qstr) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_d_hashi(struct dentry *dentry, struct qstr *qstr) +#else +static int exfat_d_hashi(const struct dentry *dentry, const struct inode *inode, + struct qstr *qstr) +#endif +{ + struct super_block *sb = dentry->d_sb; + const unsigned char *name; + unsigned int len; + unsigned long hash; + + name = qstr->name; + len = exfat_striptail_len(qstr); + + hash = init_name_hash(); + while (len--) + hash = partial_name_hash(nls_upper(sb, *name++), hash); + qstr->hash = end_name_hash(hash); + + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_cmpi(const struct dentry *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_cmpi(struct dentry *parent, struct qstr *a, struct qstr *b) +#else +static int exfat_cmpi(const struct dentry *parent, const struct inode *pinode, + const struct dentry *dentry, const struct inode *inode, + unsigned int len, const char *str, const struct qstr *name) +#endif +{ + struct nls_table *t = EXFAT_SB(parent->d_sb)->nls_io; + unsigned int alen, blen; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + alen = exfat_striptail_len(a); + blen = exfat_striptail_len(b); +#else + alen = exfat_striptail_len(name); + blen = __exfat_striptail_len(len, str); +#endif + if (alen == blen) { + if (t == NULL) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + if (strncasecmp(a->name, b->name, alen) == 0) +#else + if (strncasecmp(name->name, str, alen) == 0) +#endif + return 0; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + } else if (nls_strnicmp(t, a->name, b->name, alen) == 0) +#else + } else if (nls_strnicmp(t, name->name, str, alen) == 0) +#endif + return 0; + } + return 1; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_cmp(const struct dentry *parent, const struct dentry *dentry, + unsigned int len, const char *str, const struct qstr *name) +#elif LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) +static int exfat_cmp(struct dentry *parent, struct qstr *a, + struct qstr *b) +#else +static int exfat_cmp(const struct dentry *parent, const struct inode *pinode, + const struct dentry *dentry, const struct inode *inode, + unsigned int len, const char *str, const struct qstr *name) +#endif +{ + unsigned int alen, blen; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + alen = exfat_striptail_len(a); + blen = exfat_striptail_len(b); +#else + alen = exfat_striptail_len(name); + blen = __exfat_striptail_len(len, str); +#endif + if (alen == blen) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + if (strncmp(a->name, b->name, alen) == 0) +#else + if (strncmp(name->name, str, alen) == 0) +#endif + return 0; + } + return 1; +} + +static const struct dentry_operations exfat_ci_dentry_ops = { + .d_revalidate = exfat_revalidate_ci, + .d_hash = exfat_d_hashi, + .d_compare = exfat_cmpi, +}; + +static const struct dentry_operations exfat_dentry_ops = { + .d_revalidate = exfat_revalidate, + .d_hash = exfat_d_hash, + .d_compare = exfat_cmp, +}; + +/*======================================================================*/ +/* Directory Entry Operations */ +/*======================================================================*/ + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) +static int exfat_readdir(struct file *filp, struct dir_context *ctx) +#else +static int exfat_readdir(struct file *filp, void *dirent, filldir_t filldir) +#endif +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0) + struct inode *inode = file_inode(filp); +#else + struct inode *inode = filp->f_path.dentry->d_inode; +#endif + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + BD_INFO_T *p_bd = &(EXFAT_SB(sb)->bd_info); + DIR_ENTRY_T de; + unsigned long inum; + loff_t cpos; + int err = 0; + + __lock_super(sb); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + cpos = ctx->pos; +#else + cpos = filp->f_pos; +#endif + /* Fake . and .. for the root directory. */ + if ((p_fs->vol_type == EXFAT) || (inode->i_ino == EXFAT_ROOT_INO)) { + while (cpos < 2) { + if (inode->i_ino == EXFAT_ROOT_INO) + inum = EXFAT_ROOT_INO; + else if (cpos == 0) + inum = inode->i_ino; + else /* (cpos == 1) */ + inum = parent_ino(filp->f_path.dentry); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + if (!dir_emit_dots(filp, ctx)) +#else + if (filldir(dirent, "..", cpos+1, cpos, inum, DT_DIR) < 0) +#endif + goto out; + cpos++; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + ctx->pos++; +#else + filp->f_pos++; +#endif + } + if (cpos == 2) + cpos = 0; + } + if (cpos & (DENTRY_SIZE - 1)) { + err = -ENOENT; + goto out; + } + +get_new: + EXFAT_I(inode)->fid.size = i_size_read(inode); + EXFAT_I(inode)->fid.rwoffset = cpos >> DENTRY_SIZE_BITS; + + err = FsReadDir(inode, &de); + if (err) { + /* at least we tried to read a sector + * move cpos to next sector position (should be aligned) + */ + if (err == FFS_MEDIAERR) { + cpos += 1 << p_bd->sector_size_bits; + cpos &= ~((1 << p_bd->sector_size_bits)-1); + } + + err = -EIO; + goto end_of_dir; + } + + cpos = EXFAT_I(inode)->fid.rwoffset << DENTRY_SIZE_BITS; + + if (!de.Name[0]) + goto end_of_dir; + + if (!memcmp(de.ShortName, DOS_CUR_DIR_NAME, DOS_NAME_LENGTH)) { + inum = inode->i_ino; + } else if (!memcmp(de.ShortName, DOS_PAR_DIR_NAME, DOS_NAME_LENGTH)) { + inum = parent_ino(filp->f_path.dentry); + } else { + loff_t i_pos = ((loff_t) EXFAT_I(inode)->fid.start_clu << 32) | + ((EXFAT_I(inode)->fid.rwoffset-1) & 0xffffffff); + + struct inode *tmp = exfat_iget(sb, i_pos); + if (tmp) { + inum = tmp->i_ino; + iput(tmp); + } else { + inum = iunique(sb, EXFAT_ROOT_INO); + } + } + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + if (!dir_emit(ctx, de.Name, strlen(de.Name), inum, + (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG)) +#else + if (filldir(dirent, de.Name, strlen(de.Name), cpos-1, inum, + (de.Attr & ATTR_SUBDIR) ? DT_DIR : DT_REG) < 0) +#endif + goto out; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + ctx->pos = cpos; +#else + filp->f_pos = cpos; +#endif + goto get_new; + +end_of_dir: +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + ctx->pos = cpos; +#else + filp->f_pos = cpos; +#endif +out: + __unlock_super(sb); + return err; +} + +static int exfat_ioctl_volume_id(struct inode *dir) +{ + struct super_block *sb = dir->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + + return p_fs->vol_id; +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +static int exfat_generic_ioctl(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) +#else +static long exfat_generic_ioctl(struct file *filp, + unsigned int cmd, unsigned long arg) +#endif +{ +#if !(LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36)) + #if !(LINUX_VERSION_CODE < KERNEL_VERSION(3,18,3)) + struct inode *inode = filp->f_path.dentry->d_inode; + #else + struct inode *inode = filp->f_dentry->d_inode; + #endif +#endif +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + unsigned int flags; +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + + switch (cmd) { + case EXFAT_IOCTL_GET_VOLUME_ID: + return exfat_ioctl_volume_id(inode); +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + case EXFAT_IOC_GET_DEBUGFLAGS: { + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + + flags = sbi->debug_flags; + return put_user(flags, (int __user *)arg); + } + case EXFAT_IOC_SET_DEBUGFLAGS: { + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + if (get_user(flags, (int __user *) arg)) + return -EFAULT; + + __lock_super(sb); + sbi->debug_flags = flags; + __unlock_super(sb); + + return 0; + } +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + default: + return -ENOTTY; /* Inappropriate ioctl for device */ + } +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) +static int exfat_file_fsync(struct file *filp, struct dentry *dentry, + int datasync) +#else +static int exfat_file_fsync(struct file *filp, int datasync) +#endif +{ + struct inode *inode = filp->f_mapping->host; + struct super_block *sb = inode->i_sb; + int res, err; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,35) + res = simple_fsync(filp, dentry, datasync); +#else + res = generic_file_fsync(filp, datasync); +#endif + err = FsSyncVol(sb, 1); + + return res ? res : err; +} +#endif + +const struct file_operations exfat_dir_operations = { + .llseek = generic_file_llseek, + .read = generic_read_dir, +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,11,0) + .iterate = exfat_readdir, +#else + .readdir = exfat_readdir, +#endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + .ioctl = exfat_generic_ioctl, + .fsync = exfat_file_fsync, +#else + .unlocked_ioctl = exfat_generic_ioctl, + .fsync = generic_file_fsync, +#endif +}; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, + bool excl) +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) +static int exfat_create(struct inode *dir, struct dentry *dentry, umode_t mode, + struct nameidata *nd) +#else +static int exfat_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *nd) +#endif +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + struct timespec ts; + FILE_ID_T fid; + loff_t i_pos; + int err; + + __lock_super(sb); + + DPRINTK("exfat_create entered\n"); + + ts = CURRENT_TIME_SEC; + + err = FsCreateFile(dir, (u8 *) dentry->d_name.name, FM_REGULAR, &fid); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_FULL) + err = -ENOSPC; + else if (err == FFS_NAMETOOLONG) + err = -ENAMETOOLONG; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_ctime = dir->i_mtime = dir->i_atime = ts; + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out; + } + inode->i_version++; + inode->i_mtime = inode->i_atime = inode->i_ctime = ts; + /* timestamp is already written, so mark_inode_dirty() is unnecessary. */ + + dentry->d_time = dentry->d_parent->d_inode->i_version; + d_instantiate(dentry, inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_create exited\n"); + return err; +} + +static int exfat_find(struct inode *dir, struct qstr *qname, + FILE_ID_T *fid) +{ + int err; + + if (qname->len == 0) + return -ENOENT; + + err = FsLookupFile(dir, (u8 *) qname->name, fid); + if (err) + return -ENOENT; + + return 0; +} + +static int exfat_d_anon_disconn(struct dentry *dentry) +{ + return IS_ROOT(dentry) && (dentry->d_flags & DCACHE_DISCONNECTED); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00) +static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, + unsigned int flags) +#else +static struct dentry *exfat_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *nd) +#endif +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + struct dentry *alias; + int err; + FILE_ID_T fid; + loff_t i_pos; + u64 ret; + mode_t i_mode; + + __lock_super(sb); + DPRINTK("exfat_lookup entered\n"); + err = exfat_find(dir, &dentry->d_name, &fid); + if (err) { + if (err == -ENOENT) { + inode = NULL; + goto out; + } + goto error; + } + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto error; + } + + i_mode = inode->i_mode; + if (S_ISLNK(i_mode)) { + EXFAT_I(inode)->target = kmalloc(i_size_read(inode)+1, GFP_KERNEL); + if (!EXFAT_I(inode)->target) { + err = -ENOMEM; + goto error; + } + FsReadFile(dir, &fid, EXFAT_I(inode)->target, i_size_read(inode), &ret); + *(EXFAT_I(inode)->target + i_size_read(inode)) = '\0'; + } + + alias = d_find_alias(inode); + if (alias && !exfat_d_anon_disconn(alias)) { + CHECK_ERR(d_unhashed(alias)); + if (!S_ISDIR(i_mode)) + d_move(alias, dentry); + iput(inode); + __unlock_super(sb); + DPRINTK("exfat_lookup exited 1\n"); + return alias; + } else { + dput(alias); + } +out: + __unlock_super(sb); + dentry->d_time = dentry->d_parent->d_inode->i_version; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) + dentry->d_op = sb->s_root->d_op; + dentry = d_splice_alias(inode, dentry); + if (dentry) { + dentry->d_op = sb->s_root->d_op; + dentry->d_time = dentry->d_parent->d_inode->i_version; + } +#else + dentry = d_splice_alias(inode, dentry); + if (dentry) + dentry->d_time = dentry->d_parent->d_inode->i_version; +#endif + DPRINTK("exfat_lookup exited 2\n"); + return dentry; + +error: + __unlock_super(sb); + DPRINTK("exfat_lookup exited 3\n"); + return ERR_PTR(err); +} + +static int exfat_unlink(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + struct super_block *sb = dir->i_sb; + struct timespec ts; + int err; + + __lock_super(sb); + + DPRINTK("exfat_unlink entered\n"); + + ts = CURRENT_TIME_SEC; + + EXFAT_I(inode)->fid.size = i_size_read(inode); + + err = FsRemoveFile(dir, &(EXFAT_I(inode)->fid)); + if (err) { + if (err == FFS_PERMISSIONERR) + err = -EPERM; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_mtime = dir->i_atime = ts; + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + + clear_nlink(inode); + inode->i_mtime = inode->i_atime = ts; + exfat_detach(inode); + remove_inode_hash(inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_unlink exited\n"); + return err; +} + +static int exfat_symlink(struct inode *dir, struct dentry *dentry, const char *target) +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + struct timespec ts; + FILE_ID_T fid; + loff_t i_pos; + int err; + u64 len = (u64) strlen(target); + u64 ret; + + __lock_super(sb); + + DPRINTK("exfat_symlink entered\n"); + + ts = CURRENT_TIME_SEC; + + err = FsCreateFile(dir, (u8 *) dentry->d_name.name, FM_SYMLINK, &fid); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_FULL) + err = -ENOSPC; + else + err = -EIO; + goto out; + } + + err = FsWriteFile(dir, &fid, (char *) target, len, &ret); + + if (err) { + FsRemoveFile(dir, &fid); + + if (err == FFS_FULL) + err = -ENOSPC; + else + err = -EIO; + goto out; + } + + dir->i_version++; + dir->i_ctime = dir->i_mtime = dir->i_atime = ts; + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out; + } + inode->i_version++; + inode->i_mtime = inode->i_atime = inode->i_ctime = ts; + /* timestamp is already written, so mark_inode_dirty() is unneeded. */ + + EXFAT_I(inode)->target = kmalloc(len+1, GFP_KERNEL); + if (!EXFAT_I(inode)->target) { + err = -ENOMEM; + goto out; + } + memcpy(EXFAT_I(inode)->target, target, len+1); + + dentry->d_time = dentry->d_parent->d_inode->i_version; + d_instantiate(dentry, inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_symlink exited\n"); + return err; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) +static int exfat_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) +#else +static int exfat_mkdir(struct inode *dir, struct dentry *dentry, int mode) +#endif +{ + struct super_block *sb = dir->i_sb; + struct inode *inode; + struct timespec ts; + FILE_ID_T fid; + loff_t i_pos; + int err; + + __lock_super(sb); + + DPRINTK("exfat_mkdir entered\n"); + + ts = CURRENT_TIME_SEC; + + err = FsCreateDir(dir, (u8 *) dentry->d_name.name, &fid); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_FULL) + err = -ENOSPC; + else if (err == FFS_NAMETOOLONG) + err = -ENAMETOOLONG; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_ctime = dir->i_mtime = dir->i_atime = ts; + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + inc_nlink(dir); + + i_pos = ((loff_t) fid.dir.dir << 32) | (fid.entry & 0xffffffff); + + inode = exfat_build_inode(sb, &fid, i_pos); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto out; + } + inode->i_version++; + inode->i_mtime = inode->i_atime = inode->i_ctime = ts; + /* timestamp is already written, so mark_inode_dirty() is unneeded. */ + + dentry->d_time = dentry->d_parent->d_inode->i_version; + d_instantiate(dentry, inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_mkdir exited\n"); + return err; +} + +static int exfat_rmdir(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + struct super_block *sb = dir->i_sb; + struct timespec ts; + int err; + + __lock_super(sb); + + DPRINTK("exfat_rmdir entered\n"); + + ts = CURRENT_TIME_SEC; + + EXFAT_I(inode)->fid.size = i_size_read(inode); + + err = FsRemoveDir(dir, &(EXFAT_I(inode)->fid)); + if (err) { + if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -ENOTEMPTY; + else if (err == FFS_NOTFOUND) + err = -ENOENT; + else if (err == FFS_DIRBUSY) + err = -EBUSY; + else + err = -EIO; + goto out; + } + dir->i_version++; + dir->i_mtime = dir->i_atime = ts; + if (IS_DIRSYNC(dir)) + (void) exfat_sync_inode(dir); + else + mark_inode_dirty(dir); + drop_nlink(dir); + + clear_nlink(inode); + inode->i_mtime = inode->i_atime = ts; + exfat_detach(inode); + remove_inode_hash(inode); + +out: + __unlock_super(sb); + DPRINTK("exfat_rmdir exited\n"); + return err; +} + +static int exfat_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + struct inode *old_inode, *new_inode; + struct super_block *sb = old_dir->i_sb; + struct timespec ts; + loff_t i_pos; + int err; + + __lock_super(sb); + + DPRINTK("exfat_rename entered\n"); + + old_inode = old_dentry->d_inode; + new_inode = new_dentry->d_inode; + + ts = CURRENT_TIME_SEC; + + EXFAT_I(old_inode)->fid.size = i_size_read(old_inode); + + err = FsMoveFile(old_dir, &(EXFAT_I(old_inode)->fid), new_dir, new_dentry); + if (err) { + if (err == FFS_PERMISSIONERR) + err = -EPERM; + else if (err == FFS_INVALIDPATH) + err = -EINVAL; + else if (err == FFS_FILEEXIST) + err = -EEXIST; + else if (err == FFS_NOTFOUND) + err = -ENOENT; + else if (err == FFS_FULL) + err = -ENOSPC; + else + err = -EIO; + goto out; + } + new_dir->i_version++; + new_dir->i_ctime = new_dir->i_mtime = new_dir->i_atime = ts; + if (IS_DIRSYNC(new_dir)) + (void) exfat_sync_inode(new_dir); + else + mark_inode_dirty(new_dir); + + i_pos = ((loff_t) EXFAT_I(old_inode)->fid.dir.dir << 32) | + (EXFAT_I(old_inode)->fid.entry & 0xffffffff); + + exfat_detach(old_inode); + exfat_attach(old_inode, i_pos); + if (IS_DIRSYNC(new_dir)) + (void) exfat_sync_inode(old_inode); + else + mark_inode_dirty(old_inode); + + if ((S_ISDIR(old_inode->i_mode)) && (old_dir != new_dir)) { + drop_nlink(old_dir); + if (!new_inode) + inc_nlink(new_dir); + } + + old_dir->i_version++; + old_dir->i_ctime = old_dir->i_mtime = ts; + if (IS_DIRSYNC(old_dir)) + (void) exfat_sync_inode(old_dir); + else + mark_inode_dirty(old_dir); + + if (new_inode) { + exfat_detach(new_inode); + drop_nlink(new_inode); + if (S_ISDIR(new_inode->i_mode)) + drop_nlink(new_inode); + new_inode->i_ctime = ts; + } + +out: + __unlock_super(sb); + DPRINTK("exfat_rename exited\n"); + return err; +} + +static int exfat_cont_expand(struct inode *inode, loff_t size) +{ + struct address_space *mapping = inode->i_mapping; + loff_t start = i_size_read(inode), count = size - i_size_read(inode); + int err, err2; + + err = generic_cont_expand_simple(inode, size); + if (err != 0) + return err; + + inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; + mark_inode_dirty(inode); + + if (IS_SYNC(inode)) { + err = filemap_fdatawrite_range(mapping, start, start + count - 1); + err2 = sync_mapping_buffers(mapping); + err = (err) ? (err) : (err2); + err2 = write_inode_now(inode, 1); + err = (err) ? (err) : (err2); + if (!err) +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32) + err = wait_on_page_writeback_range(mapping, + start >> PAGE_CACHE_SHIFT, + (start + count - 1) >> PAGE_CACHE_SHIFT); +#else + err = filemap_fdatawait_range(mapping, start, start + count - 1); +#endif + } + return err; +} + +static int exfat_allow_set_time(struct exfat_sb_info *sbi, struct inode *inode) +{ + mode_t allow_utime = sbi->options.allow_utime; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + if (!uid_eq(current_fsuid(), inode->i_uid)) +#else + if (current_fsuid() != inode->i_uid) +#endif + { + if (in_group_p(inode->i_gid)) + allow_utime >>= 3; + if (allow_utime & MAY_WRITE) + return 1; + } + + /* use a default check */ + return 0; +} + +static int exfat_sanitize_mode(const struct exfat_sb_info *sbi, + struct inode *inode, umode_t *mode_ptr) +{ + mode_t i_mode, mask, perm; + + i_mode = inode->i_mode; + + if (S_ISREG(i_mode) || S_ISLNK(i_mode)) + mask = sbi->options.fs_fmask; + else + mask = sbi->options.fs_dmask; + + perm = *mode_ptr & ~(S_IFMT | mask); + + /* Of the r and x bits, all (subject to umask) must be present.*/ + if ((perm & (S_IRUGO | S_IXUGO)) != (i_mode & (S_IRUGO|S_IXUGO))) + return -EPERM; + + if (exfat_mode_can_hold_ro(inode)) { + /* Of the w bits, either all (subject to umask) or none must be present. */ + if ((perm & S_IWUGO) && ((perm & S_IWUGO) != (S_IWUGO & ~mask))) + return -EPERM; + } else { + /* If exfat_mode_can_hold_ro(inode) is false, can't change w bits. */ + if ((perm & S_IWUGO) != (S_IWUGO & ~mask)) + return -EPERM; + } + + *mode_ptr &= S_IFMT | perm; + + return 0; +} + +static int exfat_setattr(struct dentry *dentry, struct iattr *attr) +{ + + struct exfat_sb_info *sbi = EXFAT_SB(dentry->d_sb); + struct inode *inode = dentry->d_inode; + unsigned int ia_valid; + int error; +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35) + loff_t old_size; +#endif + + DPRINTK("exfat_setattr entered\n"); + + if ((attr->ia_valid & ATTR_SIZE) + && (attr->ia_size > i_size_read(inode))) { + error = exfat_cont_expand(inode, attr->ia_size); + if (error || attr->ia_valid == ATTR_SIZE) + return error; + attr->ia_valid &= ~ATTR_SIZE; + } + + ia_valid = attr->ia_valid; + + if ((ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) + && exfat_allow_set_time(sbi, inode)) { + attr->ia_valid &= ~(ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET); + } + + error = inode_change_ok(inode, attr); + attr->ia_valid = ia_valid; + if (error) + return error; + + if (((attr->ia_valid & ATTR_UID) && +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) || + ((attr->ia_valid & ATTR_GID) && + (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) || +#else + (attr->ia_uid != sbi->options.fs_uid)) || + ((attr->ia_valid & ATTR_GID) && + (attr->ia_gid != sbi->options.fs_gid)) || +#endif + ((attr->ia_valid & ATTR_MODE) && + (attr->ia_mode & ~(S_IFREG | S_IFLNK | S_IFDIR | S_IRWXUGO)))) { + return -EPERM; + } + + /* + * We don't return -EPERM here. Yes, strange, but this is too + * old behavior. + */ + if (attr->ia_valid & ATTR_MODE) { + if (exfat_sanitize_mode(sbi, inode, &attr->ia_mode) < 0) + attr->ia_valid &= ~ATTR_MODE; + } + + EXFAT_I(inode)->fid.size = i_size_read(inode); + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + if (attr->ia_valid) + error = inode_setattr(inode, attr); +#else + if (attr->ia_valid & ATTR_SIZE) { + old_size = i_size_read(inode); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + down_write(&EXFAT_I(inode)->truncate_lock); + truncate_setsize(inode, attr->ia_size); + _exfat_truncate(inode, old_size); + up_write(&EXFAT_I(inode)->truncate_lock); +#else + truncate_setsize(inode, attr->ia_size); + _exfat_truncate(inode, old_size); +#endif + } + setattr_copy(inode, attr); + mark_inode_dirty(inode); +#endif + + DPRINTK("exfat_setattr exited\n"); + return error; +} + +static int exfat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) +{ + struct inode *inode = dentry->d_inode; + + DPRINTK("exfat_getattr entered\n"); + + generic_fillattr(inode, stat); + stat->blksize = EXFAT_SB(inode->i_sb)->fs_info.cluster_size; + + DPRINTK("exfat_getattr exited\n"); + return 0; +} + +const struct inode_operations exfat_dir_inode_operations = { + .create = exfat_create, + .lookup = exfat_lookup, + .unlink = exfat_unlink, + .symlink = exfat_symlink, + .mkdir = exfat_mkdir, + .rmdir = exfat_rmdir, + .rename = exfat_rename, + .setattr = exfat_setattr, + .getattr = exfat_getattr, +}; + +/*======================================================================*/ +/* File Operations */ +/*======================================================================*/ +#if LINUX_VERSION_CODE > KERNEL_VERSION(4,1,0) +static const char *exfat_follow_link(struct dentry *dentry, void **cookie) +{ + struct exfat_inode_info *ei = EXFAT_I(dentry->d_inode); + return *cookie = (char *)(ei->target); +} +#else +static void *exfat_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + struct exfat_inode_info *ei = EXFAT_I(dentry->d_inode); + nd_set_link(nd, (char *)(ei->target)); + return NULL; +} +#endif + +const struct inode_operations exfat_symlink_inode_operations = { + .readlink = generic_readlink, + .follow_link = exfat_follow_link, +}; + +static int exfat_file_release(struct inode *inode, struct file *filp) +{ + struct super_block *sb = inode->i_sb; + + EXFAT_I(inode)->fid.size = i_size_read(inode); + FsSyncVol(sb, 0); + return 0; +} + +const struct file_operations exfat_file_operations = { + .llseek = generic_file_llseek, +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0) + .read = do_sync_read, + .write = do_sync_write, + .aio_read = generic_file_aio_read, + .aio_write = generic_file_aio_write, +#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,1,0) + .read = new_sync_read, + .write = new_sync_write, +#endif +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) + .read_iter = generic_file_read_iter, + .write_iter = generic_file_write_iter, +#endif + .mmap = generic_file_mmap, + .release = exfat_file_release, +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + .ioctl = exfat_generic_ioctl, + .fsync = exfat_file_fsync, +#else + .unlocked_ioctl = exfat_generic_ioctl, + .fsync = generic_file_fsync, +#endif + .splice_read = generic_file_splice_read, +}; + +static void _exfat_truncate(struct inode *inode, loff_t old_size) +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + int err; + + __lock_super(sb); + + /* + * This protects against truncating a file bigger than it was then + * trying to write into the hole. + */ + if (EXFAT_I(inode)->mmu_private > i_size_read(inode)) + EXFAT_I(inode)->mmu_private = i_size_read(inode); + + if (EXFAT_I(inode)->fid.start_clu == 0) + goto out; + + err = FsTruncateFile(inode, old_size, i_size_read(inode)); + if (err) + goto out; + + inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; + if (IS_DIRSYNC(inode)) + (void) exfat_sync_inode(inode); + else + mark_inode_dirty(inode); + + inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) + & ~((loff_t)p_fs->cluster_size - 1)) >> 9; +out: + __unlock_super(sb); +} + +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36) +static void exfat_truncate(struct inode *inode) +{ + _exfat_truncate(inode, i_size_read(inode)); +} +#endif + +const struct inode_operations exfat_file_inode_operations = { +#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,36) + .truncate = exfat_truncate, +#endif + .setattr = exfat_setattr, + .getattr = exfat_getattr, +}; + +/*======================================================================*/ +/* Address Space Operations */ +/*======================================================================*/ + +static int exfat_bmap(struct inode *inode, sector_t sector, sector_t *phys, + unsigned long *mapped_blocks, int *create) +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + BD_INFO_T *p_bd = &(sbi->bd_info); + const unsigned long blocksize = sb->s_blocksize; + const unsigned char blocksize_bits = sb->s_blocksize_bits; + sector_t last_block; + int err, clu_offset, sec_offset; + unsigned int cluster; + + *phys = 0; + *mapped_blocks = 0; + + if ((p_fs->vol_type == FAT12) || (p_fs->vol_type == FAT16)) { + if (inode->i_ino == EXFAT_ROOT_INO) { + if (sector < (p_fs->dentries_in_root >> (p_bd->sector_size_bits-DENTRY_SIZE_BITS))) { + *phys = sector + p_fs->root_start_sector; + *mapped_blocks = 1; + } + return 0; + } + } + + last_block = (i_size_read(inode) + (blocksize - 1)) >> blocksize_bits; + if (sector >= last_block) { + if (*create == 0) + return 0; + } else { + *create = 0; + } + + clu_offset = sector >> p_fs->sectors_per_clu_bits; /* cluster offset */ + sec_offset = sector & (p_fs->sectors_per_clu - 1); /* sector offset in cluster */ + + EXFAT_I(inode)->fid.size = i_size_read(inode); + + err = FsMapCluster(inode, clu_offset, &cluster); + + if (err) { + if (err == FFS_FULL) + return -ENOSPC; + else + return -EIO; + } else if (cluster != CLUSTER_32(~0)) { + *phys = START_SECTOR(cluster) + sec_offset; + *mapped_blocks = p_fs->sectors_per_clu - sec_offset; + } + + return 0; +} + +static int exfat_get_block(struct inode *inode, sector_t iblock, + struct buffer_head *bh_result, int create) +{ + struct super_block *sb = inode->i_sb; + unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits; + int err; + unsigned long mapped_blocks; + sector_t phys; + + __lock_super(sb); + + err = exfat_bmap(inode, iblock, &phys, &mapped_blocks, &create); + if (err) { + __unlock_super(sb); + return err; + } + + if (phys) { + max_blocks = min(mapped_blocks, max_blocks); + if (create) { + EXFAT_I(inode)->mmu_private += max_blocks << sb->s_blocksize_bits; + set_buffer_new(bh_result); + } + map_bh(bh_result, sb, phys); + } + + bh_result->b_size = max_blocks << sb->s_blocksize_bits; + __unlock_super(sb); + + return 0; +} + +static int exfat_readpage(struct file *file, struct page *page) +{ + int ret; + ret = mpage_readpage(page, exfat_get_block); + return ret; +} + +static int exfat_readpages(struct file *file, struct address_space *mapping, + struct list_head *pages, unsigned nr_pages) +{ + int ret; + ret = mpage_readpages(mapping, pages, nr_pages, exfat_get_block); + return ret; +} + +static int exfat_writepage(struct page *page, struct writeback_control *wbc) +{ + int ret; + ret = block_write_full_page(page, exfat_get_block, wbc); + return ret; +} + +static int exfat_writepages(struct address_space *mapping, + struct writeback_control *wbc) +{ + int ret; + ret = mpage_writepages(mapping, wbc, exfat_get_block); + return ret; +} + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) +static void exfat_write_failed(struct address_space *mapping, loff_t to) +{ + struct inode *inode = mapping->host; + if (to > i_size_read(inode)) { +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0) + truncate_pagecache(inode, i_size_read(inode)); +#else + truncate_pagecache(inode, to, i_size_read(inode)); +#endif + EXFAT_I(inode)->fid.size = i_size_read(inode); + _exfat_truncate(inode, i_size_read(inode)); + } +} +#endif + +static int exfat_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata) +{ + int ret; + *pagep = NULL; + ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, + exfat_get_block, + &EXFAT_I(mapping->host)->mmu_private); + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + if (ret < 0) + exfat_write_failed(mapping, pos+len); +#endif + return ret; +} + +static int exfat_write_end(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *pagep, void *fsdata) +{ + struct inode *inode = mapping->host; + FILE_ID_T *fid = &(EXFAT_I(inode)->fid); + int err; + + err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + if (err < len) + exfat_write_failed(mapping, pos+len); +#endif + + if (!(err < 0) && !(fid->attr & ATTR_ARCHIVE)) { + inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; + fid->attr |= ATTR_ARCHIVE; + mark_inode_dirty(inode); + } + return err; +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0) +#ifdef CONFIG_AIO_OPTIMIZATION +static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb, + struct iov_iter *iter, loff_t offset) +#else +static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb, + const struct iovec *iov, + loff_t offset, unsigned long nr_segs) +#endif +#elif LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0) +static ssize_t exfat_direct_IO(int rw, struct kiocb *iocb, + struct iov_iter *iter, loff_t offset) +#else /* >= 4.1.x */ +static ssize_t exfat_direct_IO(struct kiocb *iocb, + struct iov_iter *iter, loff_t offset) +#endif +{ + struct inode *inode = iocb->ki_filp->f_mapping->host; +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + struct address_space *mapping = iocb->ki_filp->f_mapping; +#endif + ssize_t ret; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0) + int rw; + + rw = iov_iter_rw(iter); +#endif + + if (rw == WRITE) { +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,16,0) +#ifdef CONFIG_AIO_OPTIMIZATION + if (EXFAT_I(inode)->mmu_private < + (offset + iov_iter_count(iter))) +#else + if (EXFAT_I(inode)->mmu_private < (offset + iov_length(iov, nr_segs))) +#endif +#else + if (EXFAT_I(inode)->mmu_private < (offset + iov_iter_count(iter))) +#endif + return 0; + } +#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,1,0) + ret = blockdev_direct_IO(iocb, inode, iter, + offset, exfat_get_block); +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) + ret = blockdev_direct_IO(rw, iocb, inode, iter, + offset, exfat_get_block); +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0) +#ifdef CONFIG_AIO_OPTIMIZATION + ret = blockdev_direct_IO(rw, iocb, inode, iter, + offset, exfat_get_block); +#else + ret = blockdev_direct_IO(rw, iocb, inode, iov, + offset, nr_segs, exfat_get_block); +#endif +#else + ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, + offset, nr_segs, exfat_get_block, NULL); +#endif + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,16,0) + if ((ret < 0) && (rw & WRITE)) + exfat_write_failed(mapping, offset+iov_iter_count(iter)); +#elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,34) + if ((ret < 0) && (rw & WRITE)) +#ifdef CONFIG_AIO_OPTIMIZATION + exfat_write_failed(mapping, offset+iov_iter_count(iter)); +#else + exfat_write_failed(mapping, offset+iov_length(iov, nr_segs)); +#endif +#endif + return ret; +} + +static sector_t _exfat_bmap(struct address_space *mapping, sector_t block) +{ + sector_t blocknr; + + /* exfat_get_cluster() assumes the requested blocknr isn't truncated. */ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + down_read(&EXFAT_I(mapping->host)->truncate_lock); + blocknr = generic_block_bmap(mapping, block, exfat_get_block); + up_read(&EXFAT_I(mapping->host)->truncate_lock); +#else + down_read(&EXFAT_I(mapping->host)->i_alloc_sem); + blocknr = generic_block_bmap(mapping, block, exfat_get_block); + up_read(&EXFAT_I(mapping->host)->i_alloc_sem); +#endif + + return blocknr; +} + +const struct address_space_operations exfat_aops = { + .readpage = exfat_readpage, + .readpages = exfat_readpages, + .writepage = exfat_writepage, + .writepages = exfat_writepages, +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,39) + .sync_page = block_sync_page, +#endif + .write_begin = exfat_write_begin, + .write_end = exfat_write_end, + .direct_IO = exfat_direct_IO, + .bmap = _exfat_bmap +}; + +/*======================================================================*/ +/* Super Operations */ +/*======================================================================*/ + +static inline unsigned long exfat_hash(loff_t i_pos) +{ + return hash_32(i_pos, EXFAT_HASH_BITS); +} + +static struct inode *exfat_iget(struct super_block *sb, loff_t i_pos) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct exfat_inode_info *info; + struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); + struct inode *inode = NULL; +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0) + struct hlist_node *node; + + spin_lock(&sbi->inode_hash_lock); + hlist_for_each_entry(info, node, head, i_hash_fat) { +#else + spin_lock(&sbi->inode_hash_lock); + hlist_for_each_entry(info, head, i_hash_fat) { +#endif + CHECK_ERR(info->vfs_inode.i_sb != sb); + + if (i_pos != info->i_pos) + continue; + inode = igrab(&info->vfs_inode); + if (inode) + break; + } + spin_unlock(&sbi->inode_hash_lock); + return inode; +} + +static void exfat_attach(struct inode *inode, loff_t i_pos) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + struct hlist_head *head = sbi->inode_hashtable + exfat_hash(i_pos); + + spin_lock(&sbi->inode_hash_lock); + EXFAT_I(inode)->i_pos = i_pos; + hlist_add_head(&EXFAT_I(inode)->i_hash_fat, head); + spin_unlock(&sbi->inode_hash_lock); +} + +static void exfat_detach(struct inode *inode) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + + spin_lock(&sbi->inode_hash_lock); + hlist_del_init(&EXFAT_I(inode)->i_hash_fat); + EXFAT_I(inode)->i_pos = 0; + spin_unlock(&sbi->inode_hash_lock); +} + +/* doesn't deal with root inode */ +static int exfat_fill_inode(struct inode *inode, FILE_ID_T *fid) +{ + struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb); + FS_INFO_T *p_fs = &(sbi->fs_info); + DIR_ENTRY_T info; + + memcpy(&(EXFAT_I(inode)->fid), fid, sizeof(FILE_ID_T)); + + FsReadStat(inode, &info); + + EXFAT_I(inode)->i_pos = 0; + EXFAT_I(inode)->target = NULL; + inode->i_uid = sbi->options.fs_uid; + inode->i_gid = sbi->options.fs_gid; + inode->i_version++; + inode->i_generation = get_seconds(); + + if (info.Attr & ATTR_SUBDIR) { /* directory */ + inode->i_generation &= ~1; + inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO); + inode->i_op = &exfat_dir_inode_operations; + inode->i_fop = &exfat_dir_operations; + + i_size_write(inode, info.Size); + EXFAT_I(inode)->mmu_private = i_size_read(inode); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,00) + set_nlink(inode, info.NumSubdirs); +#else + inode->i_nlink = info.NumSubdirs; +#endif + } else if (info.Attr & ATTR_SYMLINK) { /* symbolic link */ + inode->i_generation |= 1; + inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO); + inode->i_op = &exfat_symlink_inode_operations; + + i_size_write(inode, info.Size); + EXFAT_I(inode)->mmu_private = i_size_read(inode); + } else { /* regular file */ + inode->i_generation |= 1; + inode->i_mode = exfat_make_mode(sbi, info.Attr, S_IRWXUGO); + inode->i_op = &exfat_file_inode_operations; + inode->i_fop = &exfat_file_operations; + inode->i_mapping->a_ops = &exfat_aops; + inode->i_mapping->nrpages = 0; + + i_size_write(inode, info.Size); + EXFAT_I(inode)->mmu_private = i_size_read(inode); + } + exfat_save_attr(inode, info.Attr); + + inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) + & ~((loff_t)p_fs->cluster_size - 1)) >> 9; + + exfat_time_fat2unix(sbi, &inode->i_mtime, &info.ModifyTimestamp); + exfat_time_fat2unix(sbi, &inode->i_ctime, &info.CreateTimestamp); + exfat_time_fat2unix(sbi, &inode->i_atime, &info.AccessTimestamp); + + return 0; +} + +static struct inode *exfat_build_inode(struct super_block *sb, + FILE_ID_T *fid, loff_t i_pos) { + struct inode *inode; + int err; + + inode = exfat_iget(sb, i_pos); + if (inode) + goto out; + inode = new_inode(sb); + if (!inode) { + inode = ERR_PTR(-ENOMEM); + goto out; + } + inode->i_ino = iunique(sb, EXFAT_ROOT_INO); + inode->i_version = 1; + err = exfat_fill_inode(inode, fid); + if (err) { + iput(inode); + inode = ERR_PTR(err); + goto out; + } + exfat_attach(inode, i_pos); + insert_inode_hash(inode); +out: + return inode; +} + +static int exfat_sync_inode(struct inode *inode) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34) + return exfat_write_inode(inode, 0); +#else + return exfat_write_inode(inode, NULL); +#endif +} + +static struct inode *exfat_alloc_inode(struct super_block *sb) +{ + struct exfat_inode_info *ei; + + ei = kmem_cache_alloc(exfat_inode_cachep, GFP_NOFS); + if (!ei) + return NULL; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + init_rwsem(&ei->truncate_lock); +#endif + + return &ei->vfs_inode; +} + +static void exfat_destroy_inode(struct inode *inode) +{ + if (EXFAT_I(inode)->target) + kfree(EXFAT_I(inode)->target); + EXFAT_I(inode)->target = NULL; + + kmem_cache_free(exfat_inode_cachep, EXFAT_I(inode)); +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34) +static int exfat_write_inode(struct inode *inode, int wait) +#else +static int exfat_write_inode(struct inode *inode, struct writeback_control *wbc) +#endif +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + DIR_ENTRY_T info; + + if (inode->i_ino == EXFAT_ROOT_INO) + return 0; + + info.Attr = exfat_make_attr(inode); + info.Size = i_size_read(inode); + + exfat_time_unix2fat(sbi, &inode->i_mtime, &info.ModifyTimestamp); + exfat_time_unix2fat(sbi, &inode->i_ctime, &info.CreateTimestamp); + exfat_time_unix2fat(sbi, &inode->i_atime, &info.AccessTimestamp); + + FsWriteStat(inode, &info); + + return 0; +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) +static void exfat_delete_inode(struct inode *inode) +{ + truncate_inode_pages(&inode->i_data, 0); + clear_inode(inode); +} + +static void exfat_clear_inode(struct inode *inode) +{ + exfat_detach(inode); + remove_inode_hash(inode); +} +#else +static void exfat_evict_inode(struct inode *inode) +{ + truncate_inode_pages(&inode->i_data, 0); + + if (!inode->i_nlink) + i_size_write(inode, 0); + invalidate_inode_buffers(inode); +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,4,80) + end_writeback(inode); +#else + clear_inode(inode); +#endif + exfat_detach(inode); + + remove_inode_hash(inode); +} +#endif + +static void exfat_free_super(struct exfat_sb_info *sbi) +{ + if (sbi->nls_disk) + unload_nls(sbi->nls_disk); + if (sbi->nls_io) + unload_nls(sbi->nls_io); + if (sbi->options.iocharset != exfat_default_iocharset) + kfree(sbi->options.iocharset); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) + /* mutex_init is in exfat_fill_super function. only for 3.7+ */ + mutex_destroy(&sbi->s_lock); +#endif + kfree(sbi); +} + +static void exfat_put_super(struct super_block *sb) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + if (__is_sb_dirty(sb)) + exfat_write_super(sb); + + FsUmountVol(sb); + + sb->s_fs_info = NULL; + exfat_free_super(sbi); +} + +static void exfat_write_super(struct super_block *sb) +{ + __lock_super(sb); + + __set_sb_clean(sb); + + if (!(sb->s_flags & MS_RDONLY)) + FsSyncVol(sb, 1); + + __unlock_super(sb); +} + +static int exfat_sync_fs(struct super_block *sb, int wait) +{ + int err = 0; + + if (__is_sb_dirty(sb)) { + __lock_super(sb); + __set_sb_clean(sb); + err = FsSyncVol(sb, 1); + __unlock_super(sb); + } + + return err; +} + +static int exfat_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + u64 id = huge_encode_dev(sb->s_bdev->bd_dev); + FS_INFO_T *p_fs = &(EXFAT_SB(sb)->fs_info); + VOL_INFO_T info; + + if (p_fs->used_clusters == (u32) ~0) { + if (FFS_MEDIAERR == FsGetVolInfo(sb, &info)) + return -EIO; + + } else { + info.FatType = p_fs->vol_type; + info.ClusterSize = p_fs->cluster_size; + info.NumClusters = p_fs->num_clusters - 2; + info.UsedClusters = p_fs->used_clusters; + info.FreeClusters = info.NumClusters - info.UsedClusters; + + if (p_fs->dev_ejected) + printk("[EXFAT] statfs on device is ejected\n"); + } + + buf->f_type = sb->s_magic; + buf->f_bsize = info.ClusterSize; + buf->f_blocks = info.NumClusters; + buf->f_bfree = info.FreeClusters; + buf->f_bavail = info.FreeClusters; + buf->f_fsid.val[0] = (u32)id; + buf->f_fsid.val[1] = (u32)(id >> 32); + buf->f_namelen = 260; + + return 0; +} + +static int exfat_remount(struct super_block *sb, int *flags, char *data) +{ + *flags |= MS_NODIRATIME; + return 0; +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0) +static int exfat_show_options(struct seq_file *m, struct dentry *root) +{ + struct exfat_sb_info *sbi = EXFAT_SB(root->d_sb); +#else +static int exfat_show_options(struct seq_file *m, struct vfsmount *mnt) +{ + struct exfat_sb_info *sbi = EXFAT_SB(mnt->mnt_sb); +#endif + struct exfat_mount_options *opts = &sbi->options; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + if (__kuid_val(opts->fs_uid)) + seq_printf(m, ",uid=%u", __kuid_val(opts->fs_uid)); + if (__kgid_val(opts->fs_gid)) + seq_printf(m, ",gid=%u", __kgid_val(opts->fs_gid)); +#else + if (opts->fs_uid != 0) + seq_printf(m, ",uid=%u", opts->fs_uid); + if (opts->fs_gid != 0) + seq_printf(m, ",gid=%u", opts->fs_gid); +#endif + seq_printf(m, ",fmask=%04o", opts->fs_fmask); + seq_printf(m, ",dmask=%04o", opts->fs_dmask); + if (opts->allow_utime) + seq_printf(m, ",allow_utime=%04o", opts->allow_utime); + if (sbi->nls_disk) + seq_printf(m, ",codepage=%s", sbi->nls_disk->charset); + if (sbi->nls_io) + seq_printf(m, ",iocharset=%s", sbi->nls_io->charset); + seq_printf(m, ",namecase=%u", opts->casesensitive); + if (opts->errors == EXFAT_ERRORS_CONT) + seq_puts(m, ",errors=continue"); + else if (opts->errors == EXFAT_ERRORS_PANIC) + seq_puts(m, ",errors=panic"); + else + seq_puts(m, ",errors=remount-ro"); +#ifdef CONFIG_EXFAT_DISCARD + if (opts->discard) + seq_printf(m, ",discard"); +#endif + return 0; +} + +const struct super_operations exfat_sops = { + .alloc_inode = exfat_alloc_inode, + .destroy_inode = exfat_destroy_inode, + .write_inode = exfat_write_inode, +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,36) + .delete_inode = exfat_delete_inode, + .clear_inode = exfat_clear_inode, +#else + .evict_inode = exfat_evict_inode, +#endif + .put_super = exfat_put_super, +#if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0) + .write_super = exfat_write_super, +#endif + .sync_fs = exfat_sync_fs, + .statfs = exfat_statfs, + .remount_fs = exfat_remount, + .show_options = exfat_show_options, +}; + +/*======================================================================*/ +/* Super Block Read Operations */ +/*======================================================================*/ + +enum { + Opt_uid, + Opt_gid, + Opt_umask, + Opt_dmask, + Opt_fmask, + Opt_allow_utime, + Opt_codepage, + Opt_charset, + Opt_namecase, + Opt_debug, + Opt_err_cont, + Opt_err_panic, + Opt_err_ro, + Opt_utf8_hack, + Opt_err, +#ifdef CONFIG_EXFAT_DISCARD + Opt_discard, +#endif /* EXFAT_CONFIG_DISCARD */ +}; + +static const match_table_t exfat_tokens = { + {Opt_uid, "uid=%u"}, + {Opt_gid, "gid=%u"}, + {Opt_umask, "umask=%o"}, + {Opt_dmask, "dmask=%o"}, + {Opt_fmask, "fmask=%o"}, + {Opt_allow_utime, "allow_utime=%o"}, + {Opt_codepage, "codepage=%u"}, + {Opt_charset, "iocharset=%s"}, + {Opt_namecase, "namecase=%u"}, + {Opt_debug, "debug"}, + {Opt_err_cont, "errors=continue"}, + {Opt_err_panic, "errors=panic"}, + {Opt_err_ro, "errors=remount-ro"}, + {Opt_utf8_hack, "utf8"}, +#ifdef CONFIG_EXFAT_DISCARD + {Opt_discard, "discard"}, +#endif /* CONFIG_EXFAT_DISCARD */ + {Opt_err, NULL} +}; + +static int parse_options(char *options, int silent, int *debug, + struct exfat_mount_options *opts) +{ + char *p; + substring_t args[MAX_OPT_ARGS]; + int option; + char *iocharset; + + opts->fs_uid = current_uid(); + opts->fs_gid = current_gid(); + opts->fs_fmask = opts->fs_dmask = current->fs->umask; + opts->allow_utime = (unsigned short) -1; + opts->codepage = exfat_default_codepage; + opts->iocharset = exfat_default_iocharset; + opts->casesensitive = 0; + opts->errors = EXFAT_ERRORS_RO; +#ifdef CONFIG_EXFAT_DISCARD + opts->discard = 0; +#endif + *debug = 0; + + if (!options) + goto out; + + while ((p = strsep(&options, ",")) != NULL) { + int token; + if (!*p) + continue; + + token = match_token(p, exfat_tokens, args); + switch (token) { + case Opt_uid: + if (match_int(&args[0], &option)) + return 0; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + opts->fs_uid = KUIDT_INIT(option); +#else + opts->fs_uid = option; +#endif + break; + case Opt_gid: + if (match_int(&args[0], &option)) + return 0; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0) + opts->fs_gid = KGIDT_INIT(option); +#else + opts->fs_gid = option; +#endif + break; + case Opt_umask: + case Opt_dmask: + case Opt_fmask: + if (match_octal(&args[0], &option)) + return 0; + if (token != Opt_dmask) + opts->fs_fmask = option; + if (token != Opt_fmask) + opts->fs_dmask = option; + break; + case Opt_allow_utime: + if (match_octal(&args[0], &option)) + return 0; + opts->allow_utime = option & (S_IWGRP | S_IWOTH); + break; + case Opt_codepage: + if (match_int(&args[0], &option)) + return 0; + opts->codepage = option; + break; + case Opt_charset: + if (opts->iocharset != exfat_default_iocharset) + kfree(opts->iocharset); + iocharset = match_strdup(&args[0]); + if (!iocharset) + return -ENOMEM; + opts->iocharset = iocharset; + break; + case Opt_namecase: + if (match_int(&args[0], &option)) + return 0; + opts->casesensitive = option; + break; + case Opt_err_cont: + opts->errors = EXFAT_ERRORS_CONT; + break; + case Opt_err_panic: + opts->errors = EXFAT_ERRORS_PANIC; + break; + case Opt_err_ro: + opts->errors = EXFAT_ERRORS_RO; + break; + case Opt_debug: + *debug = 1; + break; +#ifdef CONFIG_EXFAT_DISCARD + case Opt_discard: + opts->discard = 1; + break; +#endif /* CONFIG_EXFAT_DISCARD */ + case Opt_utf8_hack: + break; + default: + if (!silent) + printk(KERN_ERR "[EXFAT] Unrecognized mount option %s or missing value\n", p); + return -EINVAL; + } + } + +out: + if (opts->allow_utime == (unsigned short) -1) + opts->allow_utime = ~opts->fs_dmask & (S_IWGRP | S_IWOTH); + + return 0; +} + +static void exfat_hash_init(struct super_block *sb) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + int i; + + spin_lock_init(&sbi->inode_hash_lock); + for (i = 0; i < EXFAT_HASH_SIZE; i++) + INIT_HLIST_HEAD(&sbi->inode_hashtable[i]); +} + +static int exfat_read_root(struct inode *inode) +{ + struct super_block *sb = inode->i_sb; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct timespec ts; + FS_INFO_T *p_fs = &(sbi->fs_info); + DIR_ENTRY_T info; + + ts = CURRENT_TIME_SEC; + + EXFAT_I(inode)->fid.dir.dir = p_fs->root_dir; + EXFAT_I(inode)->fid.dir.flags = 0x01; + EXFAT_I(inode)->fid.entry = -1; + EXFAT_I(inode)->fid.start_clu = p_fs->root_dir; + EXFAT_I(inode)->fid.flags = 0x01; + EXFAT_I(inode)->fid.type = TYPE_DIR; + EXFAT_I(inode)->fid.rwoffset = 0; + EXFAT_I(inode)->fid.hint_last_off = -1; + + EXFAT_I(inode)->target = NULL; + + FsReadStat(inode, &info); + + inode->i_uid = sbi->options.fs_uid; + inode->i_gid = sbi->options.fs_gid; + inode->i_version++; + inode->i_generation = 0; + inode->i_mode = exfat_make_mode(sbi, ATTR_SUBDIR, S_IRWXUGO); + inode->i_op = &exfat_dir_inode_operations; + inode->i_fop = &exfat_dir_operations; + + i_size_write(inode, info.Size); + inode->i_blocks = ((i_size_read(inode) + (p_fs->cluster_size - 1)) + & ~((loff_t)p_fs->cluster_size - 1)) >> 9; + EXFAT_I(inode)->i_pos = ((loff_t) p_fs->root_dir << 32) | 0xffffffff; + EXFAT_I(inode)->mmu_private = i_size_read(inode); + + exfat_save_attr(inode, ATTR_SUBDIR); + inode->i_mtime = inode->i_atime = inode->i_ctime = ts; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,00) + set_nlink(inode, info.NumSubdirs + 2); +#else + inode->i_nlink = info.NumSubdirs + 2; +#endif + + return 0; +} + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,37) +static void setup_dops(struct super_block *sb) +{ + if (EXFAT_SB(sb)->options.casesensitive == 0) + sb->s_d_op = &exfat_ci_dentry_ops; + else + sb->s_d_op = &exfat_dentry_ops; +} +#endif + +static int exfat_fill_super(struct super_block *sb, void *data, int silent) +{ + struct inode *root_inode = NULL; + struct exfat_sb_info *sbi; + int debug, ret; + long error; + char buf[50]; + + /* + * GFP_KERNEL is ok here, because while we do hold the + * supeblock lock, memory pressure can't call back into + * the filesystem, since we're only just about to mount + * it and have no inodes etc active! + */ + sbi = kzalloc(sizeof(struct exfat_sb_info), GFP_KERNEL); + if (!sbi) + return -ENOMEM; +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0) + mutex_init(&sbi->s_lock); +#endif + sb->s_fs_info = sbi; + sb->s_flags |= MS_NODIRATIME; + sb->s_magic = EXFAT_SUPER_MAGIC; + sb->s_op = &exfat_sops; + + error = parse_options(data, silent, &debug, &sbi->options); + if (error) + goto out_fail; + +#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,37) + setup_dops(sb); +#endif + + error = -EIO; + sb_min_blocksize(sb, 512); + sb->s_maxbytes = 0x7fffffffffffffffLL; /* maximum file size */ + + ret = FsMountVol(sb); + if (ret) { + if (!silent) + printk(KERN_ERR "[EXFAT] FsMountVol failed\n"); + + goto out_fail; + } + + /* set up enough so that it can read an inode */ + exfat_hash_init(sb); + + /* + * The low byte of FAT's first entry must have same value with + * media-field. But in real world, too many devices is + * writing wrong value. So, removed that validity check. + * + * if (FAT_FIRST_ENT(sb, media) != first) + */ + + /* codepage is not meaningful in exfat */ + if (sbi->fs_info.vol_type != EXFAT) { + error = -EINVAL; + sprintf(buf, "cp%d", sbi->options.codepage); + sbi->nls_disk = load_nls(buf); + if (!sbi->nls_disk) { + printk(KERN_ERR "[EXFAT] Codepage %s not found\n", buf); + goto out_fail2; + } + } + + sbi->nls_io = load_nls(sbi->options.iocharset); + + error = -ENOMEM; + root_inode = new_inode(sb); + if (!root_inode) + goto out_fail2; + root_inode->i_ino = EXFAT_ROOT_INO; + root_inode->i_version = 1; + error = exfat_read_root(root_inode); + if (error < 0) + goto out_fail2; + error = -ENOMEM; + exfat_attach(root_inode, EXFAT_I(root_inode)->i_pos); + insert_inode_hash(root_inode); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00) + sb->s_root = d_make_root(root_inode); +#else + sb->s_root = d_alloc_root(root_inode); +#endif + if (!sb->s_root) { + printk(KERN_ERR "[EXFAT] Getting the root inode failed\n"); + goto out_fail2; + } + + return 0; + +out_fail2: + FsUmountVol(sb); +out_fail: + if (root_inode) + iput(root_inode); + sb->s_fs_info = NULL; + exfat_free_super(sbi); + return error; +} +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) +static int exfat_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data, struct vfsmount *mnt) +{ + return get_sb_bdev(fs_type, flags, dev_name, data, exfat_fill_super, mnt); +} +#else +static struct dentry *exfat_fs_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data) { + return mount_bdev(fs_type, flags, dev_name, data, exfat_fill_super); +} +#endif + +static void init_once(void *foo) +{ + struct exfat_inode_info *ei = (struct exfat_inode_info *)foo; + + INIT_HLIST_NODE(&ei->i_hash_fat); + inode_init_once(&ei->vfs_inode); +} + +static int __init exfat_init_inodecache(void) +{ + exfat_inode_cachep = kmem_cache_create("exfat_inode_cache", + sizeof(struct exfat_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD), + init_once); + if (exfat_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void __exit exfat_destroy_inodecache(void) +{ + kmem_cache_destroy(exfat_inode_cachep); +} + +#ifdef CONFIG_EXFAT_KERNEL_DEBUG +static void exfat_debug_kill_sb(struct super_block *sb) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct block_device *bdev = sb->s_bdev; + + long flags; + + if (sbi) { + flags = sbi->debug_flags; + + if (flags & EXFAT_DEBUGFLAGS_INVALID_UMOUNT) { + /* invalidate_bdev drops all device cache include dirty. + we use this to simulate device removal */ + FsReleaseCache(sb); + invalidate_bdev(bdev); + } + } + + kill_block_super(sb); +} +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + +static struct file_system_type exfat_fs_type = { + .owner = THIS_MODULE, +#if defined(CONFIG_MACH_LGE) || defined(CONFIG_HTC_BATT_CORE) + .name = "texfat", +#else + .name = "exfat", +#endif +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37) + .get_sb = exfat_get_sb, +#else + .mount = exfat_fs_mount, +#endif +#ifdef CONFIG_EXFAT_KERNEL_DEBUG + .kill_sb = exfat_debug_kill_sb, +#else + .kill_sb = kill_block_super, +#endif /* CONFIG_EXFAT_KERNEL_DEBUG */ + .fs_flags = FS_REQUIRES_DEV, +}; + +static int __init init_exfat(void) +{ + int err; + + err = FsInit(); + if (err) { + if (err == FFS_MEMORYERR) + return -ENOMEM; + else + return -EIO; + } + + printk(KERN_INFO "exFAT: Version %s\n", EXFAT_VERSION); + + err = exfat_init_inodecache(); + if (err) + goto out; + + err = register_filesystem(&exfat_fs_type); + if (err) + goto out; + + return 0; +out: + FsShutdown(); + return err; +} + +static void __exit exit_exfat(void) +{ + exfat_destroy_inodecache(); + unregister_filesystem(&exfat_fs_type); + FsShutdown(); +} + +module_init(init_exfat); +module_exit(exit_exfat); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("exFAT Filesystem Driver"); +#ifdef MODULE_ALIAS_FS +#if defined(CONFIG_MACH_LGE) || defined(CONFIG_HTC_BATT_CORE) +MODULE_ALIAS_FS("texfat"); +#else +MODULE_ALIAS_FS("exfat"); +#endif +#endif |