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f2fs: get rid of online repaire on corrupted directory

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syzbot reports a f2fs bug as below:

kernel BUG at fs/f2fs/inode.c:896!
RIP: 0010:f2fs_evict_inode+0x1598/0x15c0 fs/f2fs/inode.c:896
Call Trace:
 evict+0x532/0x950 fs/inode.c:704
 dispose_list fs/inode.c:747 [inline]
 evict_inodes+0x5f9/0x690 fs/inode.c:797
 generic_shutdown_super+0x9d/0x2d0 fs/super.c:627
 kill_block_super+0x44/0x90 fs/super.c:1696
 kill_f2fs_super+0x344/0x690 fs/f2fs/super.c:4898
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 ptrace_notify+0x2d2/0x380 kernel/signal.c:2402
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0xc6/0x190 kernel/entry/common.c:173
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x279/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0010:f2fs_evict_inode+0x1598/0x15c0 fs/f2fs/inode.c:896

Online repaire on corrupted directory in f2fs_lookup() can generate
dirty data/meta while racing w/ readonly remount, it may leave dirty
inode after filesystem becomes readonly, however, checkpoint() will
skips flushing dirty inode in a state of readonly mode, result in
above panic.

Let's get rid of online repaire in f2fs_lookup(), and leave the work
to fsck.f2fs.

Fixes: 510022a858 ("f2fs: add F2FS_INLINE_DOTS to recover missing dot dentries")
Reported-by: syzbot+ebea2790904673d7c618@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/000000000000a7b20f061ff2d56a@google.com
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2024-09-06 14:27:24 +08:00 committed by Jaegeuk Kim
parent fccaa81de8
commit 884ee6dc85
3 changed files with 1 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
fs/f2fs/f2fs.h
View File

@ -790,7 +790,6 @@ enum {
FI_NEED_IPU, /* used for ipu per file */
FI_ATOMIC_FILE, /* indicate atomic file */
FI_DATA_EXIST, /* indicate data exists */
FI_INLINE_DOTS, /* indicate inline dot dentries */
FI_SKIP_WRITES, /* should skip data page writeback */
FI_OPU_WRITE, /* used for opu per file */
FI_DIRTY_FILE, /* indicate regular/symlink has dirty pages */
@ -3065,7 +3064,6 @@ static inline void __mark_inode_dirty_flag(struct inode *inode,
return;
fallthrough;
case FI_DATA_EXIST:
case FI_INLINE_DOTS:
case FI_PIN_FILE:
case FI_COMPRESS_RELEASED:
f2fs_mark_inode_dirty_sync(inode, true);
@ -3189,8 +3187,6 @@ static inline void get_inline_info(struct inode *inode, struct f2fs_inode *ri)
set_bit(FI_INLINE_DENTRY, fi->flags);
if (ri->i_inline & F2FS_DATA_EXIST)
set_bit(FI_DATA_EXIST, fi->flags);
if (ri->i_inline & F2FS_INLINE_DOTS)
set_bit(FI_INLINE_DOTS, fi->flags);
if (ri->i_inline & F2FS_EXTRA_ATTR)
set_bit(FI_EXTRA_ATTR, fi->flags);
if (ri->i_inline & F2FS_PIN_FILE)
@ -3211,8 +3207,6 @@ static inline void set_raw_inline(struct inode *inode, struct f2fs_inode *ri)
ri->i_inline |= F2FS_INLINE_DENTRY;
if (is_inode_flag_set(inode, FI_DATA_EXIST))
ri->i_inline |= F2FS_DATA_EXIST;
if (is_inode_flag_set(inode, FI_INLINE_DOTS))
ri->i_inline |= F2FS_INLINE_DOTS;
if (is_inode_flag_set(inode, FI_EXTRA_ATTR))
ri->i_inline |= F2FS_EXTRA_ATTR;
if (is_inode_flag_set(inode, FI_PIN_FILE))
@ -3293,11 +3287,6 @@ static inline int f2fs_exist_data(struct inode *inode)
return is_inode_flag_set(inode, FI_DATA_EXIST);
}
static inline int f2fs_has_inline_dots(struct inode *inode)
{
return is_inode_flag_set(inode, FI_INLINE_DOTS);
}
static inline int f2fs_is_mmap_file(struct inode *inode)
{
return is_inode_flag_set(inode, FI_MMAP_FILE);

68
fs/f2fs/namei.c
View File

@ -457,62 +457,6 @@ struct dentry *f2fs_get_parent(struct dentry *child)
return d_obtain_alias(f2fs_iget(child->d_sb, ino));
}
static int __recover_dot_dentries(struct inode *dir, nid_t pino)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
struct qstr dot = QSTR_INIT(".", 1);
struct f2fs_dir_entry *de;
struct page *page;
int err = 0;
if (f2fs_readonly(sbi->sb)) {
f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
dir->i_ino, pino);
return 0;
}
if (!S_ISDIR(dir->i_mode)) {
f2fs_err(sbi, "inconsistent inode status, skip recovering inline_dots inode (ino:%lu, i_mode:%u, pino:%u)",
dir->i_ino, dir->i_mode, pino);
set_sbi_flag(sbi, SBI_NEED_FSCK);
return -ENOTDIR;
}
err = f2fs_dquot_initialize(dir);
if (err)
return err;
f2fs_balance_fs(sbi, true);
f2fs_lock_op(sbi);
de = f2fs_find_entry(dir, &dot, &page);
if (de) {
f2fs_put_page(page, 0);
} else if (IS_ERR(page)) {
err = PTR_ERR(page);
goto out;
} else {
err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
if (err)
goto out;
}
de = f2fs_find_entry(dir, &dotdot_name, &page);
if (de)
f2fs_put_page(page, 0);
else if (IS_ERR(page))
err = PTR_ERR(page);
else
err = f2fs_do_add_link(dir, &dotdot_name, NULL, pino, S_IFDIR);
out:
if (!err)
clear_inode_flag(dir, FI_INLINE_DOTS);
f2fs_unlock_op(sbi);
return err;
}
static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags)
{
@ -522,7 +466,6 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
struct dentry *new;
nid_t ino = -1;
int err = 0;
unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
struct f2fs_filename fname;
trace_f2fs_lookup_start(dir, dentry, flags);
@ -558,17 +501,6 @@ static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
goto out;
}
if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
err = __recover_dot_dentries(dir, root_ino);
if (err)
goto out_iput;
}
if (f2fs_has_inline_dots(inode)) {
err = __recover_dot_dentries(inode, dir->i_ino);
if (err)
goto out_iput;
}
if (IS_ENCRYPTED(dir) &&
(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
!fscrypt_has_permitted_context(dir, inode)) {

2
include/linux/f2fs_fs.h
View File

@ -278,7 +278,7 @@ struct node_footer {
#define F2FS_INLINE_DATA 0x02 /* file inline data flag */
#define F2FS_INLINE_DENTRY 0x04 /* file inline dentry flag */
#define F2FS_DATA_EXIST 0x08 /* file inline data exist flag */
#define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries */
#define F2FS_INLINE_DOTS 0x10 /* file having implicit dot dentries (obsolete) */
#define F2FS_EXTRA_ATTR 0x20 /* file having extra attribute */
#define F2FS_PIN_FILE 0x40 /* file should not be gced */
#define F2FS_COMPRESS_RELEASED 0x80 /* file released compressed blocks */