[PATCH] f2fs: fix a deadlock in fsync

[Jin Xu]

This patch fixes a deadlock bug that occurs quite often when there are
concurrent write and fsync on a same file.

Following is the simplified call trace when tasks get hung.

fsync thread:
- f2fs_sync_file
 ...
 - f2fs_write_data_pages
 ...
  - update_extent_cache
  ...
   - update_inode
    - wait_on_page_writeback

bdi writeback thread
- __writeback_single_inode
 - f2fs_write_data_pages
  - mutex_lock(sbi->writepages)

The deadlock happens when the fsync thread waits on a inode page that
has
been added to the f2fs' cached bio sbi->bio[NODE], and unfortunately,
no one else could be able to submit the cached bio to block layer for
writeback. This is because the fsync thread already hold a sbi->fs_lock
and
the sbi->writepages lock, causing the bdi thread being blocked when
attempt
to write data pages for the same inode. At the same time, f2fs_gc thread
does not notice the situation and could not help. Even the sync syscall
gets blocked.

To fix it, we could submit the cached bio first before waiting on a
inode page
that is being written back.

Signed-off-by: Jin Xu <jinuxstyle@xxxxxxxxx>
[Jaegeuk Kim: add more cases to use f2fs_wait_on_page_writeback]
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>
---
 fs/f2fs/data.c    |  2 +-
 fs/f2fs/f2fs.h    |  3 ++-
 fs/f2fs/gc.c      |  8 ++------
 fs/f2fs/inode.c   |  2 +-
 fs/f2fs/segment.c | 10 ++++++++++
 5 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index f458883..a7eb529 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -37,7 +37,7 @@ static void __set_data_blkaddr(struct dnode_of_data
*dn, block_t new_addr)
 	struct page *node_page = dn->node_page;
 	unsigned int ofs_in_node = dn->ofs_in_node;
 
-	wait_on_page_writeback(node_page);
+	f2fs_wait_on_page_writeback(node_page, NODE, false);
 
 	rn = F2FS_NODE(node_page);
 
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 63813be..13db10b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1023,7 +1023,8 @@ int npages_for_summary_flush(struct f2fs_sb_info
*);
 void allocate_new_segments(struct f2fs_sb_info *);
 struct page *get_sum_page(struct f2fs_sb_info *, unsigned int);
 struct bio *f2fs_bio_alloc(struct block_device *, int);
-void f2fs_submit_bio(struct f2fs_sb_info *, enum page_type, bool sync);
+void f2fs_submit_bio(struct f2fs_sb_info *, enum page_type, bool);
+void f2fs_wait_on_page_writeback(struct page *, enum page_type, bool);
 void write_meta_page(struct f2fs_sb_info *, struct page *);
 void write_node_page(struct f2fs_sb_info *, struct page *, unsigned
int,
 					block_t, block_t *);
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index d286d8b..e6b3ffd 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -422,8 +422,7 @@ next_step:
 
 		/* set page dirty and write it */
 		if (gc_type == FG_GC) {
-			f2fs_submit_bio(sbi, NODE, true);
-			wait_on_page_writeback(node_page);
+			f2fs_wait_on_page_writeback(node_page, NODE, true);
 			set_page_dirty(node_page);
 		} else {
 			if (!PageWriteback(node_page))
@@ -523,10 +522,7 @@ static void move_data_page(struct inode *inode,
struct page *page, int gc_type)
 	} else {
 		struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
 
-		if (PageWriteback(page)) {
-			f2fs_submit_bio(sbi, DATA, true);
-			wait_on_page_writeback(page);
-		}
+		f2fs_wait_on_page_writeback(page, DATA, true);
 
 		if (clear_page_dirty_for_io(page) &&
 			S_ISDIR(inode->i_mode)) {
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index debf743..9ab81e7 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -151,7 +151,7 @@ void update_inode(struct inode *inode, struct page
*node_page)
 	struct f2fs_node *rn;
 	struct f2fs_inode *ri;
 
-	wait_on_page_writeback(node_page);
+	f2fs_wait_on_page_writeback(node_page, NODE, false);
 
 	rn = F2FS_NODE(node_page);
 	ri = &(rn->i);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 9b74ae2..68e344f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -705,6 +705,16 @@ retry:
 	trace_f2fs_submit_write_page(page, blk_addr, type);
 }
 
+void f2fs_wait_on_page_writeback(struct page *page,
+				enum page_type type, bool sync)
+{
+	struct f2fs_sb_info *sbi = F2FS_SB(page->mapping->host->i_sb);
+	if (PageWriteback(page)) {
+		f2fs_submit_bio(sbi, type, sync);
+		wait_on_page_writeback(page);
+	}
+}
+
 static bool __has_curseg_space(struct f2fs_sb_info *sbi, int type)
 {
 	struct curseg_info *curseg = CURSEG_I(sbi, type);
-- 
1.8.3.1.437.g0dbd812



-- 
Jaegeuk Kim
Samsung

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