From: Omar Sandoval <osandov@xxxxxx>
If we submit orig_bio in btrfs_submit_direct_hook(), we never increment
pending_bios. Then, if btrfs_submit_dio_bio() fails, we decrement
pending_bios to -1, and we never complete orig_bio. Fix it by
initializing pending_bios to 1 instead of incrementing later.
Fixing this exposes another bug: we put orig_bio prematurely and then
put it again from end_io. Fix it by not putting orig_bio.
After this change, pending_bios is really more of a reference count, but
I'll leave that cleanup separate to keep the fix small.
Fixes: e65e15355429 ("btrfs: fix panic caused by direct IO")
Signed-off-by: Omar Sandoval <osandov@xxxxxx>
---
fs/btrfs/inode.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8a3bc19d83ff..d48a2010f24a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7948,7 +7948,6 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip)
/* bio split */
ASSERT(geom.len <= INT_MAX);
- atomic_inc(&dip->pending_bios);
do {
clone_len = min_t(int, submit_len, geom.len);
@@ -7998,7 +7997,8 @@ static int btrfs_submit_direct_hook(struct btrfs_dio_private *dip)
if (!status)
return 0;
- bio_put(bio);
+ if (bio != orig_bio)
+ bio_put(bio);
out_err:
dip->errors = 1;
/*
@@ -8039,7 +8039,7 @@ static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
bio->bi_private = dip;
dip->orig_bio = bio;
dip->dio_bio = dio_bio;
- atomic_set(&dip->pending_bios, 0);
+ atomic_set(&dip->pending_bios, 1);
io_bio = btrfs_io_bio(bio);
io_bio->logical = file_offset;
--
2.25.1
