diff options
author | Chao Yu <chao@kernel.org> | 2022-01-27 08:44:49 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 15:40:04 +0300 |
commit | 3ef3bc75cd3ebf1e7b84a5d588229bad0255b287 (patch) | |
tree | 7ed1b9f6964071ac2ed065628085b1296b238fb2 /fs/f2fs/node.c | |
parent | 85cc399b650f10378b2753a1a5e13442f44277be (diff) | |
download | linux-3ef3bc75cd3ebf1e7b84a5d588229bad0255b287.tar.xz |
f2fs: fix to avoid potential deadlock
[ Upstream commit 344150999b7fc88502a65bbb147a47503eca2033 ]
Quoted from Jing Xia's report, there is a potential deadlock may happen
between kworker and checkpoint as below:
[T:writeback] [T:checkpoint]
- wb_writeback
- blk_start_plug
bio contains NodeA was plugged in writeback threads
- do_writepages -- sync write inodeB, inc wb_sync_req[DATA]
- f2fs_write_data_pages
- f2fs_write_single_data_page -- write last dirty page
- f2fs_do_write_data_page
- set_page_writeback -- clear page dirty flag and
PAGECACHE_TAG_DIRTY tag in radix tree
- f2fs_outplace_write_data
- f2fs_update_data_blkaddr
- f2fs_wait_on_page_writeback -- wait NodeA to writeback here
- inode_dec_dirty_pages
- writeback_sb_inodes
- writeback_single_inode
- do_writepages
- f2fs_write_data_pages -- skip writepages due to wb_sync_req[DATA]
- wbc->pages_skipped += get_dirty_pages() -- PAGECACHE_TAG_DIRTY is not set but get_dirty_pages() returns one
- requeue_inode -- requeue inode to wb->b_dirty queue due to non-zero.pages_skipped
- blk_finish_plug
Let's try to avoid deadlock condition by forcing unplugging previous bio via
blk_finish_plug(current->plug) once we'v skipped writeback in writepages()
due to valid sbi->wb_sync_req[DATA/NODE].
Fixes: 687de7f1010c ("f2fs: avoid IO split due to mixed WB_SYNC_ALL and WB_SYNC_NONE")
Signed-off-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Jing Xia <jing.xia@unisoc.com>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/f2fs/node.c')
-rw-r--r-- | fs/f2fs/node.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 7e625806bd4a..5fa10d0b0068 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -2055,8 +2055,12 @@ static int f2fs_write_node_pages(struct address_space *mapping, if (wbc->sync_mode == WB_SYNC_ALL) atomic_inc(&sbi->wb_sync_req[NODE]); - else if (atomic_read(&sbi->wb_sync_req[NODE])) + else if (atomic_read(&sbi->wb_sync_req[NODE])) { + /* to avoid potential deadlock */ + if (current->plug) + blk_finish_plug(current->plug); goto skip_write; + } trace_f2fs_writepages(mapping->host, wbc, NODE); |