diff options
Diffstat (limited to 'fs/fat')
| -rw-r--r-- | fs/fat/dir.c | 10 | ||||
| -rw-r--r-- | fs/fat/fat.h | 14 | ||||
| -rw-r--r-- | fs/fat/fatent.c | 7 | ||||
| -rw-r--r-- | fs/fat/file.c | 38 | ||||
| -rw-r--r-- | fs/fat/inode.c | 46 | ||||
| -rw-r--r-- | fs/fat/misc.c | 78 | ||||
| -rw-r--r-- | fs/fat/namei_vfat.c | 235 |
7 files changed, 304 insertions, 124 deletions
diff --git a/fs/fat/dir.c b/fs/fat/dir.c index c4a274285858..00235b8a1823 100644 --- a/fs/fat/dir.c +++ b/fs/fat/dir.c @@ -705,7 +705,7 @@ static int fat_readdir(struct file *file, struct dir_context *ctx) } #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ -static int func(struct dir_context *ctx, const char *name, int name_len, \ +static bool func(struct dir_context *ctx, const char *name, int name_len, \ loff_t offset, u64 ino, unsigned int d_type) \ { \ struct fat_ioctl_filldir_callback *buf = \ @@ -714,7 +714,7 @@ static int func(struct dir_context *ctx, const char *name, int name_len, \ struct dirent_type __user *d2 = d1 + 1; \ \ if (buf->result) \ - return -EINVAL; \ + return false; \ buf->result++; \ \ if (name != NULL) { \ @@ -722,7 +722,7 @@ static int func(struct dir_context *ctx, const char *name, int name_len, \ if (name_len >= sizeof(d1->d_name)) \ name_len = sizeof(d1->d_name) - 1; \ \ - if (put_user(0, d2->d_name) || \ + if (put_user(0, &d2->d_name[0]) || \ put_user(0, &d2->d_reclen) || \ copy_to_user(d1->d_name, name, name_len) || \ put_user(0, d1->d_name + name_len) || \ @@ -750,10 +750,10 @@ static int func(struct dir_context *ctx, const char *name, int name_len, \ put_user(short_len, &d1->d_reclen)) \ goto efault; \ } \ - return 0; \ + return true; \ efault: \ buf->result = -EFAULT; \ - return -EFAULT; \ + return false; \ } FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) diff --git a/fs/fat/fat.h b/fs/fat/fat.h index 02d4d4234956..a415c02ede39 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -126,6 +126,7 @@ struct msdos_inode_info { struct hlist_node i_fat_hash; /* hash by i_location */ struct hlist_node i_dir_hash; /* hash by i_logstart */ struct rw_semaphore truncate_lock; /* protect bmap against truncate */ + struct timespec64 i_crtime; /* File creation (birth) time */ struct inode vfs_inode; }; @@ -433,8 +434,15 @@ void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...); __fat_fs_error(sb, 1, fmt , ## args) #define fat_fs_error_ratelimit(sb, fmt, args...) \ __fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args) + +#define FAT_PRINTK_PREFIX "%sFAT-fs (%s): " +#define fat_msg(sb, level, fmt, args...) \ +do { \ + printk_index_subsys_emit(FAT_PRINTK_PREFIX, level, fmt, ##args);\ + _fat_msg(sb, level, fmt, ##args); \ +} while (0) __printf(3, 4) __cold -void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...); +void _fat_msg(struct super_block *sb, const char *level, const char *fmt, ...); #define fat_msg_ratelimit(sb, level, fmt, args...) \ do { \ if (__ratelimit(&MSDOS_SB(sb)->ratelimit)) \ @@ -446,6 +454,10 @@ extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec64 *ts, __le16 __time, __le16 __date, u8 time_cs); extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec64 *ts, __le16 *time, __le16 *date, u8 *time_cs); +extern struct timespec64 fat_truncate_atime(const struct msdos_sb_info *sbi, + const struct timespec64 *ts); +extern struct timespec64 fat_truncate_mtime(const struct msdos_sb_info *sbi, + const struct timespec64 *ts); extern int fat_truncate_time(struct inode *inode, struct timespec64 *now, int flags); extern int fat_update_time(struct inode *inode, struct timespec64 *now, diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c index 978ac6751aeb..1db348f8f887 100644 --- a/fs/fat/fatent.c +++ b/fs/fat/fatent.c @@ -94,7 +94,8 @@ static int fat12_ent_bread(struct super_block *sb, struct fat_entry *fatent, err_brelse: brelse(bhs[0]); err: - fat_msg(sb, KERN_ERR, "FAT read failed (blocknr %llu)", (llu)blocknr); + fat_msg_ratelimit(sb, KERN_ERR, "FAT read failed (blocknr %llu)", + (llu)blocknr); return -EIO; } @@ -107,8 +108,8 @@ static int fat_ent_bread(struct super_block *sb, struct fat_entry *fatent, fatent->fat_inode = MSDOS_SB(sb)->fat_inode; fatent->bhs[0] = sb_bread(sb, blocknr); if (!fatent->bhs[0]) { - fat_msg(sb, KERN_ERR, "FAT read failed (blocknr %llu)", - (llu)blocknr); + fat_msg_ratelimit(sb, KERN_ERR, "FAT read failed (blocknr %llu)", + (llu)blocknr); return -EIO; } fatent->nr_bhs = 1; diff --git a/fs/fat/file.c b/fs/fat/file.c index 13855ba49cd9..8a6b493b5b5f 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -90,7 +90,8 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr) * out the RO attribute for checking by the security * module, just because it maps to a file mode. */ - err = security_inode_setattr(file->f_path.dentry, &ia); + err = security_inode_setattr(file_mnt_user_ns(file), + file->f_path.dentry, &ia); if (err) goto out_unlock_inode; @@ -127,13 +128,12 @@ static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg) struct super_block *sb = inode->i_sb; struct fstrim_range __user *user_range; struct fstrim_range range; - struct request_queue *q = bdev_get_queue(sb->s_bdev); int err; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (!blk_queue_discard(q)) + if (!bdev_max_discard_sectors(sb->s_bdev)) return -EOPNOTSUPP; user_range = (struct fstrim_range __user *)arg; @@ -141,7 +141,7 @@ static int fat_ioctl_fitrim(struct inode *inode, unsigned long arg) return -EFAULT; range.minlen = max_t(unsigned int, range.minlen, - q->limits.discard_granularity); + bdev_discard_granularity(sb->s_bdev)); err = fat_trim_fs(inode, &range); if (err < 0) @@ -175,9 +175,10 @@ long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) static int fat_file_release(struct inode *inode, struct file *filp) { if ((filp->f_mode & FMODE_WRITE) && - MSDOS_SB(inode->i_sb)->options.flush) { + MSDOS_SB(inode->i_sb)->options.flush) { fat_flush_inodes(inode->i_sb, inode, NULL); - congestion_wait(BLK_RW_ASYNC, HZ/10); + set_current_state(TASK_UNINTERRUPTIBLE); + io_schedule_timeout(HZ/10); } return 0; } @@ -398,13 +399,21 @@ int fat_getattr(struct user_namespace *mnt_userns, const struct path *path, struct kstat *stat, u32 request_mask, unsigned int flags) { struct inode *inode = d_inode(path->dentry); + struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); + generic_fillattr(mnt_userns, inode, stat); - stat->blksize = MSDOS_SB(inode->i_sb)->cluster_size; + stat->blksize = sbi->cluster_size; - if (MSDOS_SB(inode->i_sb)->options.nfs == FAT_NFS_NOSTALE_RO) { + if (sbi->options.nfs == FAT_NFS_NOSTALE_RO) { /* Use i_pos for ino. This is used as fileid of nfs. */ - stat->ino = fat_i_pos_read(MSDOS_SB(inode->i_sb), inode); + stat->ino = fat_i_pos_read(sbi, inode); } + + if (sbi->options.isvfat && request_mask & STATX_BTIME) { + stat->result_mask |= STATX_BTIME; + stat->btime = MSDOS_I(inode)->i_crtime; + } + return 0; } EXPORT_SYMBOL_GPL(fat_getattr); @@ -452,8 +461,9 @@ static int fat_allow_set_time(struct user_namespace *mnt_userns, { umode_t allow_utime = sbi->options.allow_utime; - if (!uid_eq(current_fsuid(), i_uid_into_mnt(mnt_userns, inode))) { - if (in_group_p(i_gid_into_mnt(mnt_userns, inode))) + if (!vfsuid_eq_kuid(i_uid_into_vfsuid(mnt_userns, inode), + current_fsuid())) { + if (vfsgid_in_group_p(i_gid_into_vfsgid(mnt_userns, inode))) allow_utime >>= 3; if (allow_utime & MAY_WRITE) return 1; @@ -508,9 +518,11 @@ int fat_setattr(struct user_namespace *mnt_userns, struct dentry *dentry, } if (((attr->ia_valid & ATTR_UID) && - (!uid_eq(attr->ia_uid, sbi->options.fs_uid))) || + (!uid_eq(from_vfsuid(mnt_userns, i_user_ns(inode), attr->ia_vfsuid), + sbi->options.fs_uid))) || ((attr->ia_valid & ATTR_GID) && - (!gid_eq(attr->ia_gid, sbi->options.fs_gid))) || + (!gid_eq(from_vfsgid(mnt_userns, i_user_ns(inode), attr->ia_vfsgid), + sbi->options.fs_gid))) || ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~FAT_VALID_MODE))) error = -EPERM; diff --git a/fs/fat/inode.c b/fs/fat/inode.c index a6f1c6d426d1..1cbcc4608dc7 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -205,9 +205,9 @@ static int fat_writepages(struct address_space *mapping, return mpage_writepages(mapping, wbc, fat_get_block); } -static int fat_readpage(struct file *file, struct page *page) +static int fat_read_folio(struct file *file, struct folio *folio) { - return mpage_readpage(page, fat_get_block); + return mpage_read_folio(folio, fat_get_block); } static void fat_readahead(struct readahead_control *rac) @@ -226,13 +226,13 @@ static void fat_write_failed(struct address_space *mapping, loff_t to) } static int fat_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, + loff_t pos, unsigned len, struct page **pagep, void **fsdata) { int err; *pagep = NULL; - err = cont_write_begin(file, mapping, pos, len, flags, + err = cont_write_begin(file, mapping, pos, len, pagep, fsdata, fat_get_block, &MSDOS_I(mapping->host)->mmu_private); if (err < 0) @@ -342,8 +342,9 @@ int fat_block_truncate_page(struct inode *inode, loff_t from) } static const struct address_space_operations fat_aops = { - .set_page_dirty = __set_page_dirty_buffers, - .readpage = fat_readpage, + .dirty_folio = block_dirty_folio, + .invalidate_folio = block_invalidate_folio, + .read_folio = fat_read_folio, .readahead = fat_readahead, .writepage = fat_writepage, .writepages = fat_writepages, @@ -522,7 +523,7 @@ int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) inode->i_uid = sbi->options.fs_uid; inode->i_gid = sbi->options.fs_gid; inode_inc_iversion(inode); - inode->i_generation = prandom_u32(); + inode->i_generation = get_random_u32(); if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) { inode->i_generation &= ~1; @@ -566,12 +567,13 @@ int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) & ~((loff_t)sbi->cluster_size - 1)) >> 9; fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0); + inode->i_ctime = inode->i_mtime; if (sbi->options.isvfat) { - fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime, - de->cdate, de->ctime_cs); fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0); + fat_time_fat2unix(sbi, &MSDOS_I(inode)->i_crtime, de->ctime, + de->cdate, de->ctime_cs); } else - fat_truncate_time(inode, &inode->i_mtime, S_ATIME|S_CTIME); + inode->i_atime = fat_truncate_atime(sbi, &inode->i_mtime); return 0; } @@ -745,7 +747,7 @@ static struct kmem_cache *fat_inode_cachep; static struct inode *fat_alloc_inode(struct super_block *sb) { struct msdos_inode_info *ei; - ei = kmem_cache_alloc(fat_inode_cachep, GFP_NOFS); + ei = alloc_inode_sb(sb, fat_inode_cachep, GFP_NOFS); if (!ei) return NULL; @@ -756,6 +758,8 @@ static struct inode *fat_alloc_inode(struct super_block *sb) ei->i_logstart = 0; ei->i_attrs = 0; ei->i_pos = 0; + ei->i_crtime.tv_sec = 0; + ei->i_crtime.tv_nsec = 0; return &ei->vfs_inode; } @@ -887,10 +891,10 @@ retry: &raw_entry->date, NULL); if (sbi->options.isvfat) { __le16 atime; - fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime, - &raw_entry->cdate, &raw_entry->ctime_cs); fat_time_unix2fat(sbi, &inode->i_atime, &atime, &raw_entry->adate, NULL); + fat_time_unix2fat(sbi, &MSDOS_I(inode)->i_crtime, &raw_entry->ctime, + &raw_entry->cdate, &raw_entry->ctime_cs); } spin_unlock(&sbi->inode_hash_lock); mark_buffer_dirty(bh); @@ -1871,13 +1875,9 @@ int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, goto out_fail; } - if (sbi->options.discard) { - struct request_queue *q = bdev_get_queue(sb->s_bdev); - if (!blk_queue_discard(q)) - fat_msg(sb, KERN_WARNING, - "mounting with \"discard\" option, but " - "the device does not support discard"); - } + if (sbi->options.discard && !bdev_max_discard_sectors(sb->s_bdev)) + fat_msg(sb, KERN_WARNING, + "mounting with \"discard\" option, but the device does not support discard"); fat_set_state(sb, 1, 0); return 0; @@ -1888,10 +1888,8 @@ out_invalid: fat_msg(sb, KERN_INFO, "Can't find a valid FAT filesystem"); out_fail: - if (fsinfo_inode) - iput(fsinfo_inode); - if (fat_inode) - iput(fat_inode); + iput(fsinfo_inode); + iput(fat_inode); unload_nls(sbi->nls_io); unload_nls(sbi->nls_disk); fat_reset_iocharset(&sbi->options); diff --git a/fs/fat/misc.c b/fs/fat/misc.c index 91ca3c304211..7e5d6ae305f2 100644 --- a/fs/fat/misc.c +++ b/fs/fat/misc.c @@ -42,10 +42,16 @@ void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...) EXPORT_SYMBOL_GPL(__fat_fs_error); /** - * fat_msg() - print preformated FAT specific messages. Every thing what is - * not fat_fs_error() should be fat_msg(). + * _fat_msg() - Print a preformatted FAT message based on a superblock. + * @sb: A pointer to a &struct super_block + * @level: A Kernel printk level constant + * @fmt: The printf-style format string to print. + * + * Everything that is not fat_fs_error() should be fat_msg(). + * + * fat_msg() wraps _fat_msg() for printk indexing. */ -void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...) +void _fat_msg(struct super_block *sb, const char *level, const char *fmt, ...) { struct va_format vaf; va_list args; @@ -53,7 +59,7 @@ void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...) va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; - printk("%sFAT-fs (%s): %pV\n", level, sb->s_id, &vaf); + _printk(FAT_PRINTK_PREFIX "%pV\n", level, sb->s_id, &vaf); va_end(args); } @@ -187,7 +193,7 @@ static long days_in_year[] = { 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 0, 0, 0, }; -static inline int fat_tz_offset(struct msdos_sb_info *sbi) +static inline int fat_tz_offset(const struct msdos_sb_info *sbi) { return (sbi->options.tz_set ? -sbi->options.time_offset : @@ -275,23 +281,35 @@ static inline struct timespec64 fat_timespec64_trunc_2secs(struct timespec64 ts) return (struct timespec64){ ts.tv_sec & ~1ULL, 0 }; } -static inline struct timespec64 fat_timespec64_trunc_10ms(struct timespec64 ts) +/* + * truncate atime to 24 hour granularity (00:00:00 in local timezone) + */ +struct timespec64 fat_truncate_atime(const struct msdos_sb_info *sbi, + const struct timespec64 *ts) +{ + /* to localtime */ + time64_t seconds = ts->tv_sec - fat_tz_offset(sbi); + s32 remainder; + + div_s64_rem(seconds, SECS_PER_DAY, &remainder); + /* to day boundary, and back to unix time */ + seconds = seconds + fat_tz_offset(sbi) - remainder; + + return (struct timespec64){ seconds, 0 }; +} + +/* + * truncate mtime to 2 second granularity + */ +struct timespec64 fat_truncate_mtime(const struct msdos_sb_info *sbi, + const struct timespec64 *ts) { - if (ts.tv_nsec) - ts.tv_nsec -= ts.tv_nsec % 10000000UL; - return ts; + return fat_timespec64_trunc_2secs(*ts); } /* * truncate the various times with appropriate granularity: - * root inode: - * all times always 0 - * all other inodes: - * mtime - 2 seconds - * ctime - * msdos - 2 seconds - * vfat - 10 milliseconds - * atime - 24 hours (00:00:00 in local timezone) + * all times in root node are always 0 */ int fat_truncate_time(struct inode *inode, struct timespec64 *now, int flags) { @@ -306,25 +324,15 @@ int fat_truncate_time(struct inode *inode, struct timespec64 *now, int flags) ts = current_time(inode); } - if (flags & S_ATIME) { - /* to localtime */ - time64_t seconds = now->tv_sec - fat_tz_offset(sbi); - s32 remainder; - - div_s64_rem(seconds, SECS_PER_DAY, &remainder); - /* to day boundary, and back to unix time */ - seconds = seconds + fat_tz_offset(sbi) - remainder; - - inode->i_atime = (struct timespec64){ seconds, 0 }; - } - if (flags & S_CTIME) { - if (sbi->options.isvfat) - inode->i_ctime = fat_timespec64_trunc_10ms(*now); - else - inode->i_ctime = fat_timespec64_trunc_2secs(*now); - } + if (flags & S_ATIME) + inode->i_atime = fat_truncate_atime(sbi, now); + /* + * ctime and mtime share the same on-disk field, and should be + * identical in memory. all mtime updates will be applied to ctime, + * but ctime updates are ignored. + */ if (flags & S_MTIME) - inode->i_mtime = fat_timespec64_trunc_2secs(*now); + inode->i_mtime = inode->i_ctime = fat_truncate_mtime(sbi, now); return 0; } diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c index 5369d82e0bfb..21620054e1c4 100644 --- a/fs/fat/namei_vfat.c +++ b/fs/fat/namei_vfat.c @@ -780,8 +780,6 @@ static int vfat_create(struct user_namespace *mnt_userns, struct inode *dir, goto out; } inode_inc_iversion(inode); - fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME); - /* timestamp is already written, so mark_inode_dirty() is unneeded. */ d_instantiate(dentry, inode); out: @@ -878,8 +876,6 @@ static int vfat_mkdir(struct user_namespace *mnt_userns, struct inode *dir, } inode_inc_iversion(inode); set_nlink(inode, 2); - fat_truncate_time(inode, &ts, S_ATIME|S_CTIME|S_MTIME); - /* timestamp is already written, so mark_inode_dirty() is unneeded. */ d_instantiate(dentry, inode); @@ -893,22 +889,57 @@ out: return err; } -static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir, - struct dentry *old_dentry, struct inode *new_dir, - struct dentry *new_dentry, unsigned int flags) +static int vfat_get_dotdot_de(struct inode *inode, struct buffer_head **bh, + struct msdos_dir_entry **de) +{ + if (S_ISDIR(inode->i_mode)) { + if (fat_get_dotdot_entry(inode, bh, de)) + return -EIO; + } + return 0; +} + +static int vfat_sync_ipos(struct inode *dir, struct inode *inode) +{ + if (IS_DIRSYNC(dir)) + return fat_sync_inode(inode); + mark_inode_dirty(inode); + return 0; +} + +static int vfat_update_dotdot_de(struct inode *dir, struct inode *inode, + struct buffer_head *dotdot_bh, + struct msdos_dir_entry *dotdot_de) +{ + fat_set_start(dotdot_de, MSDOS_I(dir)->i_logstart); + mark_buffer_dirty_inode(dotdot_bh, inode); + if (IS_DIRSYNC(dir)) + return sync_dirty_buffer(dotdot_bh); + return 0; +} + +static void vfat_update_dir_metadata(struct inode *dir, struct timespec64 *ts) +{ + inode_inc_iversion(dir); + fat_truncate_time(dir, ts, S_CTIME | S_MTIME); + if (IS_DIRSYNC(dir)) + (void)fat_sync_inode(dir); + else + mark_inode_dirty(dir); +} + +static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) { struct buffer_head *dotdot_bh; - struct msdos_dir_entry *dotdot_de; + struct msdos_dir_entry *dotdot_de = NULL; struct inode *old_inode, *new_inode; struct fat_slot_info old_sinfo, sinfo; struct timespec64 ts; loff_t new_i_pos; - int err, is_dir, update_dotdot, corrupt = 0; + int err, is_dir, corrupt = 0; struct super_block *sb = old_dir->i_sb; - if (flags & ~RENAME_NOREPLACE) - return -EINVAL; - old_sinfo.bh = sinfo.bh = dotdot_bh = NULL; old_inode = d_inode(old_dentry); new_inode = d_inode(new_dentry); @@ -917,15 +948,13 @@ static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir, if (err) goto out; - is_dir = S_ISDIR(old_inode->i_mode); - update_dotdot = (is_dir && old_dir != new_dir); - if (update_dotdot) { - if (fat_get_dotdot_entry(old_inode, &dotdot_bh, &dotdot_de)) { - err = -EIO; + if (old_dir != new_dir) { + err = vfat_get_dotdot_de(old_inode, &dotdot_bh, &dotdot_de); + if (err) goto out; - } } + is_dir = S_ISDIR(old_inode->i_mode); ts = current_time(old_dir); if (new_inode) { if (is_dir) { @@ -946,21 +975,15 @@ static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir, fat_detach(old_inode); fat_attach(old_inode, new_i_pos); - if (IS_DIRSYNC(new_dir)) { - err = fat_sync_inode(old_inode); - if (err) - goto error_inode; - } else - mark_inode_dirty(old_inode); + err = vfat_sync_ipos(new_dir, old_inode); + if (err) + goto error_inode; - if (update_dotdot) { - fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart); - mark_buffer_dirty_inode(dotdot_bh, old_inode); - if (IS_DIRSYNC(new_dir)) { - err = sync_dirty_buffer(dotdot_bh); - if (err) - goto error_dotdot; - } + if (dotdot_de) { + err = vfat_update_dotdot_de(new_dir, old_inode, dotdot_bh, + dotdot_de); + if (err) + goto error_dotdot; drop_nlink(old_dir); if (!new_inode) inc_nlink(new_dir); @@ -970,12 +993,7 @@ static int vfat_rename(struct user_namespace *mnt_userns, struct inode *old_dir, old_sinfo.bh = NULL; if (err) goto error_dotdot; - inode_inc_iversion(old_dir); - fat_truncate_time(old_dir, &ts, S_CTIME|S_MTIME); - if (IS_DIRSYNC(old_dir)) - (void)fat_sync_inode(old_dir); - else - mark_inode_dirty(old_dir); + vfat_update_dir_metadata(old_dir, &ts); if (new_inode) { drop_nlink(new_inode); @@ -995,10 +1013,9 @@ error_dotdot: /* data cluster is shared, serious corruption */ corrupt = 1; - if (update_dotdot) { - fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart); - mark_buffer_dirty_inode(dotdot_bh, old_inode); - corrupt |= sync_dirty_buffer(dotdot_bh); + if (dotdot_de) { + corrupt |= vfat_update_dotdot_de(old_dir, old_inode, dotdot_bh, + dotdot_de); } error_inode: fat_detach(old_inode); @@ -1025,13 +1042,145 @@ error_inode: goto out; } +static void vfat_exchange_ipos(struct inode *old_inode, struct inode *new_inode, + loff_t old_i_pos, loff_t new_i_pos) +{ + fat_detach(old_inode); + fat_detach(new_inode); + fat_attach(old_inode, new_i_pos); + fat_attach(new_inode, old_i_pos); +} + +static void vfat_move_nlink(struct inode *src, struct inode *dst) +{ + drop_nlink(src); + inc_nlink(dst); +} + +static int vfat_rename_exchange(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + struct buffer_head *old_dotdot_bh = NULL, *new_dotdot_bh = NULL; + struct msdos_dir_entry *old_dotdot_de = NULL, *new_dotdot_de = NULL; + struct inode *old_inode, *new_inode; + struct timespec64 ts = current_time(old_dir); + loff_t old_i_pos, new_i_pos; + int err, corrupt = 0; + struct super_block *sb = old_dir->i_sb; + + old_inode = d_inode(old_dentry); + new_inode = d_inode(new_dentry); + + /* Acquire super block lock for the operation to be atomic */ + mutex_lock(&MSDOS_SB(sb)->s_lock); + + /* if directories are not the same, get ".." info to update */ + if (old_dir != new_dir) { + err = vfat_get_dotdot_de(old_inode, &old_dotdot_bh, + &old_dotdot_de); + if (err) + goto out; + + err = vfat_get_dotdot_de(new_inode, &new_dotdot_bh, + &new_dotdot_de); + if (err) + goto out; + } + + old_i_pos = MSDOS_I(old_inode)->i_pos; + new_i_pos = MSDOS_I(new_inode)->i_pos; + + vfat_exchange_ipos(old_inode, new_inode, old_i_pos, new_i_pos); + + err = vfat_sync_ipos(old_dir, new_inode); + if (err) + goto error_exchange; + err = vfat_sync_ipos(new_dir, old_inode); + if (err) + goto error_exchange; + + /* update ".." directory entry info */ + if (old_dotdot_de) { + err = vfat_update_dotdot_de(new_dir, old_inode, old_dotdot_bh, + old_dotdot_de); + if (err) + goto error_old_dotdot; + } + if (new_dotdot_de) { + err = vfat_update_dotdot_de(old_dir, new_inode, new_dotdot_bh, + new_dotdot_de); + if (err) + goto error_new_dotdot; + } + + /* if cross directory and only one is a directory, adjust nlink */ + if (!old_dotdot_de != !new_dotdot_de) { + if (old_dotdot_de) + vfat_move_nlink(old_dir, new_dir); + else + vfat_move_nlink(new_dir, old_dir); + } + + vfat_update_dir_metadata(old_dir, &ts); + /* if directories are not the same, update new_dir as well */ + if (old_dir != new_dir) + vfat_update_dir_metadata(new_dir, &ts); + +out: + brelse(old_dotdot_bh); + brelse(new_dotdot_bh); + mutex_unlock(&MSDOS_SB(sb)->s_lock); + + return err; + +error_new_dotdot: + if (new_dotdot_de) { + corrupt |= vfat_update_dotdot_de(new_dir, new_inode, + new_dotdot_bh, new_dotdot_de); + } + +error_old_dotdot: + if (old_dotdot_de) { + corrupt |= vfat_update_dotdot_de(old_dir, old_inode, + old_dotdot_bh, old_dotdot_de); + } + +error_exchange: + vfat_exchange_ipos(old_inode, new_inode, new_i_pos, old_i_pos); + corrupt |= vfat_sync_ipos(new_dir, new_inode); + corrupt |= vfat_sync_ipos(old_dir, old_inode); + + if (corrupt < 0) { + fat_fs_error(new_dir->i_sb, + "%s: Filesystem corrupted (i_pos %lld, %lld)", + __func__, old_i_pos, new_i_pos); + } + goto out; +} + +static int vfat_rename2(struct user_namespace *mnt_userns, struct inode *old_dir, + struct dentry *old_dentry, struct inode *new_dir, + struct dentry *new_dentry, unsigned int flags) +{ + if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) + return -EINVAL; + + if (flags & RENAME_EXCHANGE) { + return vfat_rename_exchange(old_dir, old_dentry, + new_dir, new_dentry); + } + + /* VFS already handled RENAME_NOREPLACE, handle it as a normal rename */ + return vfat_rename(old_dir, old_dentry, new_dir, new_dentry); +} + static const struct inode_operations vfat_dir_inode_operations = { .create = vfat_create, .lookup = vfat_lookup, .unlink = vfat_unlink, .mkdir = vfat_mkdir, .rmdir = vfat_rmdir, - .rename = vfat_rename, + .rename = vfat_rename2, .setattr = fat_setattr, .getattr = fat_getattr, .update_time = fat_update_time, |