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Code Issues Releases Wiki Activity

f2fs: fix potential deadlock due to unpaired node_write lock use

Browse source 
If S_NOQUOTA is cleared from inode during data page writeback of quota
file, it may miss to unlock node_write lock, result in potential
deadlock, fix to use the lock in paired.

Kworker					Thread
- writepage
 if (IS_NOQUOTA())
   f2fs_down_read(&sbi->node_write);
					- vfs_cleanup_quota_inode
					 - inode->i_flags &= ~S_NOQUOTA;
 if (IS_NOQUOTA())
   f2fs_up_read(&sbi->node_write);

Fixes: 79963d967b ("f2fs: shrink node_write lock coverage")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2023-05-14 16:07:23 +08:00 committed by Jaegeuk Kim
parent 36ded4c106
commit f082c6b205
2 changed files with 8 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
fs/f2fs/compress.c
View file

@ -1215,6 +1215,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
unsigned int last_index = cc->cluster_size - 1;
loff_t psize;
int i, err;
bool quota_inode = IS_NOQUOTA(inode);
/* we should bypass data pages to proceed the kworker jobs */
if (unlikely(f2fs_cp_error(sbi))) {
@ -1222,7 +1223,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
goto out_free;
}
if (IS_NOQUOTA(inode)) {
if (quota_inode) {
/*
* We need to wait for node_write to avoid block allocation during
* checkpoint. This can only happen to quota writes which can cause
@ -1344,7 +1345,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
f2fs_put_dnode(&dn);
if (IS_NOQUOTA(inode))
if (quota_inode)
f2fs_up_read(&sbi->node_write);
else
f2fs_unlock_op(sbi);
@ -1370,7 +1371,7 @@ static int f2fs_write_compressed_pages(struct compress_ctx *cc,
out_put_dnode:
f2fs_put_dnode(&dn);
out_unlock_op:
if (IS_NOQUOTA(inode))
if (quota_inode)
f2fs_up_read(&sbi->node_write);
else
f2fs_unlock_op(sbi);

7
fs/f2fs/data.c
View file

@ -2832,6 +2832,7 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
loff_t psize = (loff_t)(page->index + 1) << PAGE_SHIFT;
unsigned offset = 0;
bool need_balance_fs = false;
bool quota_inode = IS_NOQUOTA(inode);
int err = 0;
struct f2fs_io_info fio = {
.sbi = sbi,
@ -2893,19 +2894,19 @@ int f2fs_write_single_data_page(struct page *page, int *submitted,
goto out;
/* Dentry/quota blocks are controlled by checkpoint */
if (S_ISDIR(inode->i_mode) || IS_NOQUOTA(inode)) {
if (S_ISDIR(inode->i_mode) || quota_inode) {
/*
* We need to wait for node_write to avoid block allocation during
* checkpoint. This can only happen to quota writes which can cause
* the below discard race condition.
*/
if (IS_NOQUOTA(inode))
if (quota_inode)
f2fs_down_read(&sbi->node_write);
fio.need_lock = LOCK_DONE;
err = f2fs_do_write_data_page(&fio);
if (IS_NOQUOTA(inode))
if (quota_inode)
f2fs_up_read(&sbi->node_write);
goto done;