From: Filipe Manana Date: Fri, 2 Aug 2024 08:38:51 +0000 (+0100) Subject: btrfs: fix double inode unlock for direct IO sync writes X-Git-Tag: v6.11-rc3~31^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=e0391e92f9ab4fb3dbdeb139c967dcfa7ac4b115;p=thirdparty%2Fkernel%2Flinux.git btrfs: fix double inode unlock for direct IO sync writes If we do a direct IO sync write, at btrfs_sync_file(), and we need to skip inode logging or we get an error starting a transaction or an error when flushing delalloc, we end up unlocking the inode when we shouldn't under the 'out_release_extents' label, and then unlock it again at btrfs_direct_write(). Fix that by checking if we have to skip inode unlocking under that label. Reported-by: syzbot+7dbbb74af6291b5a5a8b@syzkaller.appspotmail.com Link: https://lore.kernel.org/linux-btrfs/000000000000dfd631061eaeb4bc@google.com/ Fixes: 939b656bc8ab ("btrfs: fix corruption after buffer fault in during direct IO append write") Reviewed-by: Josef Bacik Signed-off-by: Filipe Manana Signed-off-by: David Sterba --- diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 9f10a9f23fcc8..9914419f3b7d6 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1868,7 +1868,10 @@ out: out_release_extents: btrfs_release_log_ctx_extents(&ctx); - btrfs_inode_unlock(inode, BTRFS_ILOCK_MMAP); + if (skip_ilock) + up_write(&inode->i_mmap_lock); + else + btrfs_inode_unlock(inode, BTRFS_ILOCK_MMAP); goto out; }