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BACKPORT: f2fs: don't get FREEZE lock in f2fs_evict_inode in frozen fs

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Let's purge inode cache in order to avoid the below deadlock.

[freeze test]                         shrinkder
freeze_super
 - pwercpu_down_write(SB_FREEZE_FS)
                                       - super_cache_scan
                                         - down_read(&sb->s_umount)
                                           - prune_icache_sb
                                            - dispose_list
                                             - evict
                                              - f2fs_evict_inode
thaw_super
 - down_write(&sb->s_umount);
                                              - __percpu_down_read(SB_FREEZE_FS)

Bug: 242127451
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Change-Id: Ifa01aca90eab6968c5e511fb3819854121aa9b7c
(cherry picked from commit e3d44a0028f58cd1dcba053120652e1a1ea6ce12)
This commit is contained in:
Jaegeuk Kim
2022-03-04 09:40:05 -08:00
committed by Jaegeuk Kim
parent 594835143a
commit 604f2f5656
4 changed files with 10 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/ABI/testing/sysfs-fs-f2fs
View File

@@ -432,6 +432,7 @@ Description: Show status of f2fs superblock in real time.
0x800 SBI_QUOTA_SKIP_FLUSH skip flushing quota in current CP
0x1000 SBI_QUOTA_NEED_REPAIR quota file may be corrupted
0x2000 SBI_IS_RESIZEFS resizefs is in process
0x4000 SBI_IS_FREEZING freefs is in process
====== ===================== =================================
What: /sys/fs/f2fs/<disk>/ckpt_thread_ioprio

1
fs/f2fs/f2fs.h
View File

@@ -1247,6 +1247,7 @@ enum {
SBI_QUOTA_SKIP_FLUSH, /* skip flushing quota in current CP */
SBI_QUOTA_NEED_REPAIR, /* quota file may be corrupted */
SBI_IS_RESIZEFS, /* resizefs is in process */
SBI_IS_FREEZING, /* freezefs is in process */
};
enum {

6
fs/f2fs/inode.c
View File

@@ -764,7 +764,8 @@ void f2fs_evict_inode(struct inode *inode)
f2fs_remove_ino_entry(sbi, inode->i_ino, UPDATE_INO);
f2fs_remove_ino_entry(sbi, inode->i_ino, FLUSH_INO);
sb_start_intwrite(inode->i_sb);
if (!is_sbi_flag_set(sbi, SBI_IS_FREEZING))
sb_start_intwrite(inode->i_sb);
set_inode_flag(inode, FI_NO_ALLOC);
i_size_write(inode, 0);
retry:
@@ -795,7 +796,8 @@ retry:
if (dquot_initialize_needed(inode))
set_sbi_flag(sbi, SBI_QUOTA_NEED_REPAIR);
}
sb_end_intwrite(inode->i_sb);
if (!is_sbi_flag_set(sbi, SBI_IS_FREEZING))
sb_end_intwrite(inode->i_sb);
no_delete:
dquot_drop(inode);

4
fs/f2fs/super.c
View File

@@ -1558,11 +1558,15 @@ static int f2fs_freeze(struct super_block *sb)
/* ensure no checkpoint required */
if (!llist_empty(&F2FS_SB(sb)->cprc_info.issue_list))
return -EINVAL;
/* to avoid deadlock on f2fs_evict_inode->SB_FREEZE_FS */
set_sbi_flag(F2FS_SB(sb), SBI_IS_FREEZING);
return 0;
}
static int f2fs_unfreeze(struct super_block *sb)
{
clear_sbi_flag(F2FS_SB(sb), SBI_IS_FREEZING);
return 0;
}