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f2fs: fix iostat lock protection 

[ Upstream commit 144f1cd40b ]

Made iostat lock irq safe to avoid potentinal deadlock.

Deadlock scenario:
f2fs_attr_store
  -> f2fs_sbi_store
  -> _sbi_store
  -> spin_lock(sbi->iostat_lock)
    <interrupt request>
    -> scsi_end_request
    -> bio_endio
    -> f2fs_dio_read_end_io
    -> f2fs_update_iostat
    -> spin_lock_irqsave(sbi->iostat_lock)  ===> Dead lock here

Fixes: 61803e9843 ("f2fs: fix iostat related lock protection")
Fixes: a1e09b03e6 ("f2fs: use iomap for direct I/O")
Signed-off-by: Qilin Tan <qilin.tan@mediatek.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Qilin Tan 2023-03-31 17:26:56 +08:00 committed by Greg Kroah-Hartman
parent dc918d5ff6
commit b8236fd6d9
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/f2fs/sysfs.c
View File

@ -564,9 +564,9 @@ out:
if (!strcmp(a->attr.name, "iostat_period_ms")) {
if (t < MIN_IOSTAT_PERIOD_MS || t > MAX_IOSTAT_PERIOD_MS)
return -EINVAL;
spin_lock(&sbi->iostat_lock);
spin_lock_irq(&sbi->iostat_lock);
sbi->iostat_period_ms = (unsigned int)t;
spin_unlock(&sbi->iostat_lock);
spin_unlock_irq(&sbi->iostat_lock);
return count;
}
#endif