* [f2fs-dev] [PATCH] f2fs: quota: fix quota flush failure during filesystem freeze
@ 2026-09-08 3:48 Jianan Huang
2026-09-09 11:42 ` Chao Yu via Linux-f2fs-devel
0 siblings, 1 reply; 2+ messages in thread
From: Jianan Huang @ 2026-09-08 3:48 UTC (permalink / raw)
To: linux-f2fs-devel, chao, jaegeuk; +Cc: Jianan Huang
Quota flush retries can be exhausted during filesystem freeze.
freeze_super() and the quota checkpoint may race as below.
freeze_super() f2fs_ckpt
- down_write(&sb->s_umount)
- sb->s_writers.frozen = SB_FREEZE_PAGEFAULT
- sync_filesystem()
- f2fs_sync_fs()
- f2fs_issue_checkpoint()
- queue CP_SYNC -----------------> - block_operations()
- down_read_trylock(s_umount)
: fails; freeze holds write lock
- quota flush retries exhausted
- set CP_QUOTA_NEED_FSCK_FLAG
During the PAGEFAULT sync pass, freeze_super() holds s_umount for
write, but umount_lock_holder is not set until f2fs_freeze(). Thus
quota writeback tries to acquire s_umount again and can exhaust retries.
With checkpoint merge enabled, f2fs_issue_checkpoint() may dispatch
CP_SYNC to f2fs_ckpt. That thread also cannot acquire the freeze lock.
Split the F2FS-internal sync implementation from the super-operation
callback. For the VFS PAGEFAULT freeze sync, record current as holder
around the internal sync. This lets quota writeback use the existing
lock and makes CP_SYNC run directly in the freeze caller.
Convert F2FS-internal callers to the internal helper so they cannot be
mistaken for the freeze owner while the filesystem is frozen.
Fixes: eb85c2410d6f ("f2fs: quota: fix to avoid warning in dquot_writeback_dquots()")
Signed-off-by: Jianan Huang <jnhuang95@gmail.com>
---
fs/f2fs/f2fs.h | 2 +-
fs/f2fs/file.c | 8 ++++----
fs/f2fs/namei.c | 16 ++++++++--------
fs/f2fs/segment.c | 4 ++--
fs/f2fs/super.c | 25 ++++++++++++++++++++++---
5 files changed, 37 insertions(+), 18 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 9940a6cecf1a..169792a08a82 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3977,7 +3977,7 @@ void f2fs_quota_off_umount(struct super_block *sb);
void f2fs_save_errors(struct f2fs_sb_info *sbi, unsigned char flag);
void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error);
int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover);
-int f2fs_sync_fs(struct super_block *sb, int sync);
+int __f2fs_sync_fs(struct super_block *sb, int sync);
int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi);
/*
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index edc352569e87..83546a053656 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -408,7 +408,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
if (cp_reason) {
/* all the dirty node pages should be flushed for POR */
- ret = f2fs_sync_fs(inode->i_sb, 1);
+ ret = __f2fs_sync_fs(inode->i_sb, 1);
/*
* We've secured consistency through sync_fs. Following pino
@@ -2548,7 +2548,7 @@ int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,
break;
case F2FS_GOING_DOWN_METASYNC:
/* do checkpoint only */
- ret = f2fs_sync_fs(sb, 1);
+ ret = __f2fs_sync_fs(sb, 1);
if (ret) {
if (ret == -EIO)
ret = 0;
@@ -2568,7 +2568,7 @@ int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,
set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
set_sbi_flag(sbi, SBI_IS_DIRTY);
/* do checkpoint only */
- ret = f2fs_sync_fs(sb, 1);
+ ret = __f2fs_sync_fs(sb, 1);
if (ret == -EIO)
ret = 0;
goto out;
@@ -2988,7 +2988,7 @@ static int f2fs_ioc_write_checkpoint(struct file *filp)
if (ret)
return ret;
- ret = f2fs_sync_fs(sbi->sb, 1);
+ ret = __f2fs_sync_fs(sbi->sb, 1);
mnt_drop_write_file(filp);
return ret;
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index ff86ee07290d..5f6f5db9e849 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -403,7 +403,7 @@ static int f2fs_create(struct mnt_idmap *idmap, struct inode *dir,
d_instantiate_new(dentry, inode);
if (IS_DIRSYNC(dir)) {
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
if (err)
return err;
}
@@ -459,7 +459,7 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
d_instantiate(dentry, inode);
if (IS_DIRSYNC(dir)) {
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
if (err)
return err;
}
@@ -641,7 +641,7 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
d_invalidate(dentry);
if (IS_DIRSYNC(dir))
- err = f2fs_sync_fs(F2FS_I_SB(dir)->sb, 1);
+ err = __f2fs_sync_fs(F2FS_I_SB(dir)->sb, 1);
out:
trace_f2fs_unlink_exit(d_inode(dentry), err);
return err;
@@ -729,7 +729,7 @@ static int f2fs_symlink(struct mnt_idmap *idmap, struct inode *dir,
ret = filemap_write_and_wait_range(inode->i_mapping, 0,
disk_link.len - 1);
if (!ret && IS_DIRSYNC(dir))
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
f2fs_balance_fs(sbi, true);
out:
@@ -787,7 +787,7 @@ static struct dentry *f2fs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
d_instantiate_new(dentry, inode);
if (IS_DIRSYNC(dir)) {
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
if (err)
return ERR_PTR(err);
}
@@ -845,7 +845,7 @@ static int f2fs_mknod(struct mnt_idmap *idmap, struct inode *dir,
d_instantiate_new(dentry, inode);
if (IS_DIRSYNC(dir)) {
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
if (err)
return err;
}
@@ -1148,7 +1148,7 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
f2fs_unlock_op(sbi, &lc);
if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) {
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
if (err)
return err;
}
@@ -1318,7 +1318,7 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
f2fs_unlock_op(sbi, &lc);
if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) {
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
if (err)
return err;
}
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 63b712d3d599..9a09f2525b70 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -550,7 +550,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg)
mutex_unlock(&sbi->flush_lock);
}
stat_inc_cp_call_count(sbi, BACKGROUND);
- f2fs_sync_fs(sbi->sb, 1);
+ __f2fs_sync_fs(sbi->sb, 1);
}
static int __submit_flush_wait(struct f2fs_sb_info *sbi,
@@ -3478,7 +3478,7 @@ int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi)
true, ZONED_PIN_SEC_REQUIRED_COUNT, true);
if (err)
return err;
- err = f2fs_sync_fs(sbi->sb, 1);
+ err = __f2fs_sync_fs(sbi->sb, 1);
if (!err) {
gc_required = false;
goto retry;
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 1314b6ccced9..a82065146849 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2131,7 +2131,7 @@ static void f2fs_put_super(struct super_block *sb)
}
}
-int f2fs_sync_fs(struct super_block *sb, int sync)
+int __f2fs_sync_fs(struct super_block *sb, int sync)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
int err = 0;
@@ -2154,6 +2154,25 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
return err;
}
+static int f2fs_sync_fs(struct super_block *sb, int sync)
+{
+ struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ bool freeze_sync = sync &&
+ sb->s_writers.frozen == SB_FREEZE_PAGEFAULT;
+ int err;
+
+ /* freeze_super() holds s_umount for write during this sync pass. */
+ if (freeze_sync)
+ sbi->umount_lock_holder = current;
+
+ err = __f2fs_sync_fs(sb, sync);
+
+ if (freeze_sync)
+ sbi->umount_lock_holder = NULL;
+
+ return err;
+}
+
static int f2fs_freeze(struct super_block *sb)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
@@ -2807,7 +2826,7 @@ static int f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
set_sbi_flag(sbi, SBI_IS_DIRTY);
f2fs_up_write_trace(&sbi->gc_lock, &lc);
- ret = f2fs_sync_fs(sbi->sb, 1);
+ ret = __f2fs_sync_fs(sbi->sb, 1);
if (ret)
f2fs_err(sbi, "%s sync_fs failed, ret: %d", __func__, ret);
@@ -2993,7 +3012,7 @@ static int __f2fs_remount(struct fs_context *fc, struct super_block *sb)
set_sbi_flag(sbi, SBI_IS_DIRTY);
set_sbi_flag(sbi, SBI_IS_CLOSE);
- err = f2fs_sync_fs(sb, 1);
+ err = __f2fs_sync_fs(sb, 1);
if (err)
goto restore_gc;
clear_sbi_flag(sbi, SBI_IS_CLOSE);
--
2.43.0
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Linux-f2fs-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [f2fs-dev] [PATCH] f2fs: quota: fix quota flush failure during filesystem freeze
2026-09-08 3:48 [f2fs-dev] [PATCH] f2fs: quota: fix quota flush failure during filesystem freeze Jianan Huang
@ 2026-09-09 11:42 ` Chao Yu via Linux-f2fs-devel
0 siblings, 0 replies; 2+ messages in thread
From: Chao Yu via Linux-f2fs-devel @ 2026-09-09 11:42 UTC (permalink / raw)
To: Jianan Huang, linux-f2fs-devel, jaegeuk
On 9/8/26 11:48, Jianan Huang wrote:
> Quota flush retries can be exhausted during filesystem freeze.
>
> freeze_super() and the quota checkpoint may race as below.
>
> freeze_super() f2fs_ckpt
> - down_write(&sb->s_umount)
> - sb->s_writers.frozen = SB_FREEZE_PAGEFAULT
> - sync_filesystem()
> - f2fs_sync_fs()
> - f2fs_issue_checkpoint()
> - queue CP_SYNC -----------------> - block_operations()
> - down_read_trylock(s_umount)
> : fails; freeze holds write lock
> - quota flush retries exhausted
> - set CP_QUOTA_NEED_FSCK_FLAG
>
> During the PAGEFAULT sync pass, freeze_super() holds s_umount for
> write, but umount_lock_holder is not set until f2fs_freeze(). Thus
> quota writeback tries to acquire s_umount again and can exhaust retries.
>
> With checkpoint merge enabled, f2fs_issue_checkpoint() may dispatch
> CP_SYNC to f2fs_ckpt. That thread also cannot acquire the freeze lock.
>
> Split the F2FS-internal sync implementation from the super-operation
> callback. For the VFS PAGEFAULT freeze sync, record current as holder
> around the internal sync. This lets quota writeback use the existing
> lock and makes CP_SYNC run directly in the freeze caller.
>
> Convert F2FS-internal callers to the internal helper so they cannot be
> mistaken for the freeze owner while the filesystem is frozen.
>
> Fixes: eb85c2410d6f ("f2fs: quota: fix to avoid warning in dquot_writeback_dquots()")
> Signed-off-by: Jianan Huang <jnhuang95@gmail.com>
> ---
> fs/f2fs/f2fs.h | 2 +-
> fs/f2fs/file.c | 8 ++++----
> fs/f2fs/namei.c | 16 ++++++++--------
> fs/f2fs/segment.c | 4 ++--
> fs/f2fs/super.c | 25 ++++++++++++++++++++++---
> 5 files changed, 37 insertions(+), 18 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 9940a6cecf1a..169792a08a82 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3977,7 +3977,7 @@ void f2fs_quota_off_umount(struct super_block *sb);
> void f2fs_save_errors(struct f2fs_sb_info *sbi, unsigned char flag);
> void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error);
> int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover);
> -int f2fs_sync_fs(struct super_block *sb, int sync);
> +int __f2fs_sync_fs(struct super_block *sb, int sync);
> int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi);
>
> /*
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index edc352569e87..83546a053656 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -408,7 +408,7 @@ static int f2fs_do_sync_file(struct file *file, loff_t start, loff_t end,
>
> if (cp_reason) {
> /* all the dirty node pages should be flushed for POR */
> - ret = f2fs_sync_fs(inode->i_sb, 1);
> + ret = __f2fs_sync_fs(inode->i_sb, 1);
>
> /*
> * We've secured consistency through sync_fs. Following pino
> @@ -2548,7 +2548,7 @@ int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,
> break;
> case F2FS_GOING_DOWN_METASYNC:
> /* do checkpoint only */
> - ret = f2fs_sync_fs(sb, 1);
> + ret = __f2fs_sync_fs(sb, 1);
> if (ret) {
> if (ret == -EIO)
> ret = 0;
> @@ -2568,7 +2568,7 @@ int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,
> set_sbi_flag(sbi, SBI_CP_DISABLED_QUICK);
> set_sbi_flag(sbi, SBI_IS_DIRTY);
> /* do checkpoint only */
> - ret = f2fs_sync_fs(sb, 1);
> + ret = __f2fs_sync_fs(sb, 1);
> if (ret == -EIO)
> ret = 0;
> goto out;
> @@ -2988,7 +2988,7 @@ static int f2fs_ioc_write_checkpoint(struct file *filp)
> if (ret)
> return ret;
>
> - ret = f2fs_sync_fs(sbi->sb, 1);
> + ret = __f2fs_sync_fs(sbi->sb, 1);
>
> mnt_drop_write_file(filp);
> return ret;
> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
> index ff86ee07290d..5f6f5db9e849 100644
> --- a/fs/f2fs/namei.c
> +++ b/fs/f2fs/namei.c
> @@ -403,7 +403,7 @@ static int f2fs_create(struct mnt_idmap *idmap, struct inode *dir,
> d_instantiate_new(dentry, inode);
>
> if (IS_DIRSYNC(dir)) {
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
> if (err)
> return err;
> }
> @@ -459,7 +459,7 @@ static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
> d_instantiate(dentry, inode);
>
> if (IS_DIRSYNC(dir)) {
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
> if (err)
> return err;
> }
> @@ -641,7 +641,7 @@ static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
> d_invalidate(dentry);
>
> if (IS_DIRSYNC(dir))
> - err = f2fs_sync_fs(F2FS_I_SB(dir)->sb, 1);
> + err = __f2fs_sync_fs(F2FS_I_SB(dir)->sb, 1);
> out:
> trace_f2fs_unlink_exit(d_inode(dentry), err);
> return err;
> @@ -729,7 +729,7 @@ static int f2fs_symlink(struct mnt_idmap *idmap, struct inode *dir,
> ret = filemap_write_and_wait_range(inode->i_mapping, 0,
> disk_link.len - 1);
> if (!ret && IS_DIRSYNC(dir))
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
>
> f2fs_balance_fs(sbi, true);
> out:
> @@ -787,7 +787,7 @@ static struct dentry *f2fs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
> d_instantiate_new(dentry, inode);
>
> if (IS_DIRSYNC(dir)) {
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
> if (err)
> return ERR_PTR(err);
> }
> @@ -845,7 +845,7 @@ static int f2fs_mknod(struct mnt_idmap *idmap, struct inode *dir,
> d_instantiate_new(dentry, inode);
>
> if (IS_DIRSYNC(dir)) {
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
> if (err)
> return err;
> }
> @@ -1148,7 +1148,7 @@ static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
> f2fs_unlock_op(sbi, &lc);
>
> if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) {
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
> if (err)
> return err;
> }
> @@ -1318,7 +1318,7 @@ static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
> f2fs_unlock_op(sbi, &lc);
>
> if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) {
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
> if (err)
> return err;
> }
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 63b712d3d599..9a09f2525b70 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -550,7 +550,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg)
> mutex_unlock(&sbi->flush_lock);
> }
> stat_inc_cp_call_count(sbi, BACKGROUND);
> - f2fs_sync_fs(sbi->sb, 1);
> + __f2fs_sync_fs(sbi->sb, 1);
> }
>
> static int __submit_flush_wait(struct f2fs_sb_info *sbi,
> @@ -3478,7 +3478,7 @@ int f2fs_allocate_pinning_section(struct f2fs_sb_info *sbi)
> true, ZONED_PIN_SEC_REQUIRED_COUNT, true);
> if (err)
> return err;
> - err = f2fs_sync_fs(sbi->sb, 1);
> + err = __f2fs_sync_fs(sbi->sb, 1);
> if (!err) {
> gc_required = false;
> goto retry;
> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
> index 1314b6ccced9..a82065146849 100644
> --- a/fs/f2fs/super.c
> +++ b/fs/f2fs/super.c
> @@ -2131,7 +2131,7 @@ static void f2fs_put_super(struct super_block *sb)
> }
> }
>
> -int f2fs_sync_fs(struct super_block *sb, int sync)
> +int __f2fs_sync_fs(struct super_block *sb, int sync)
> {
> struct f2fs_sb_info *sbi = F2FS_SB(sb);
> int err = 0;
> @@ -2154,6 +2154,25 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
> return err;
> }
>
> +static int f2fs_sync_fs(struct super_block *sb, int sync)
> +{
> + struct f2fs_sb_info *sbi = F2FS_SB(sb);
> + bool freeze_sync = sync &&
> + sb->s_writers.frozen == SB_FREEZE_PAGEFAULT;
How about this to make sure freeze_sync will only be true in freeze_super()?
bool freeze_sync = sync && rwsem_is_locked(&sb->s_umount) &&
sb->s_writers.frozen == SB_FREEZE_PAGEFAULT;
And it's not needed to rename f2fs_sync_fs() to __f2fs_sync_fs()?
Thanks,
> + int err;
> +
> + /* freeze_super() holds s_umount for write during this sync pass. */
> + if (freeze_sync)
> + sbi->umount_lock_holder = current;
> +
> + err = __f2fs_sync_fs(sb, sync);
> +
> + if (freeze_sync)
> + sbi->umount_lock_holder = NULL;
> +
> + return err;
> +}
> +
> static int f2fs_freeze(struct super_block *sb)
> {
> struct f2fs_sb_info *sbi = F2FS_SB(sb);
> @@ -2807,7 +2826,7 @@ static int f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
> set_sbi_flag(sbi, SBI_IS_DIRTY);
> f2fs_up_write_trace(&sbi->gc_lock, &lc);
>
> - ret = f2fs_sync_fs(sbi->sb, 1);
> + ret = __f2fs_sync_fs(sbi->sb, 1);
> if (ret)
> f2fs_err(sbi, "%s sync_fs failed, ret: %d", __func__, ret);
>
> @@ -2993,7 +3012,7 @@ static int __f2fs_remount(struct fs_context *fc, struct super_block *sb)
>
> set_sbi_flag(sbi, SBI_IS_DIRTY);
> set_sbi_flag(sbi, SBI_IS_CLOSE);
> - err = f2fs_sync_fs(sb, 1);
> + err = __f2fs_sync_fs(sb, 1);
> if (err)
> goto restore_gc;
> clear_sbi_flag(sbi, SBI_IS_CLOSE);
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2026-09-08 3:48 [f2fs-dev] [PATCH] f2fs: quota: fix quota flush failure during filesystem freeze Jianan Huang
2026-09-09 11:42 ` Chao Yu via Linux-f2fs-devel
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