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From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: linux-fsdevel@vger.kernel.org
Cc: linux-ext4@vger.kernel.org, linux-btrfs@vger.kernel.org,
	hch@infradead.org, andres@anarazel.de, david@fromorbit.com,
	riteshh@linux.ibm.com, linux-f2fs-devel@lists.sourceforge.net,
	Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH 1/3] btrfs: fix inode rwsem regression
Date: Wed, 11 Sep 2019 11:45:15 -0500
Message-ID: <20190911164517.16130-2-rgoldwyn@suse.de> (raw)
In-Reply-To: <20190911164517.16130-1-rgoldwyn@suse.de>

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

This is similar to 942491c9e6d6 ("xfs: fix AIM7 regression")
Apparently our current rwsem code doesn't like doing the trylock, then
lock for real scheme.  So change our read/write methods to just do the
trylock for the RWF_NOWAIT case.

Fixes: edf064e7c6fe ("btrfs: nowait aio support")
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/btrfs/file.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 58a18ed11546..651b2b1f4219 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1893,9 +1893,10 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
 	    (iocb->ki_flags & IOCB_NOWAIT))
 		return -EOPNOTSUPP;
 
-	if (!inode_trylock(inode)) {
-		if (iocb->ki_flags & IOCB_NOWAIT)
+	if (iocb->ki_flags & IOCB_NOWAIT) {
+		if (!inode_trylock(inode))
 			return -EAGAIN;
+	} else {
 		inode_lock(inode);
 	}
 
-- 
2.16.4


  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20190910223327.mnegfoggopwqqy33@alap3.anarazel.de>
     [not found] ` <20190911040420.GB27547@dread.disaster.area>
2019-09-11  9:39   ` Odd locking pattern introduced as part of "nowait aio support" Andres Freund
2019-09-11 10:19     ` Christoph Hellwig
2019-09-11 10:31     ` Ritesh Harjani
2019-09-11 10:55     ` Goldwyn Rodrigues
2019-09-11 16:45     ` Fix inode sem regression for nowait Goldwyn Rodrigues
2019-09-11 16:45       ` Goldwyn Rodrigues [this message]
2019-09-11 17:21         ` [PATCH 1/3] btrfs: fix inode rwsem regression David Sterba
2019-09-11 16:45       ` [PATCH 2/3] ext4: " Goldwyn Rodrigues
2019-09-12  8:52         ` Ritesh Harjani
2019-09-12  9:26           ` Matthew Bobrowski
2019-09-23 10:10         ` Jan Kara
2019-09-23 13:18           ` Theodore Y. Ts'o
2019-09-11 16:45       ` [PATCH 3/3] f2fs: " Goldwyn Rodrigues
2019-09-12  6:17         ` Chao Yu
2019-09-13 19:46         ` Jaegeuk Kim
2019-09-16  1:16           ` Chao Yu

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