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authorFilipe Manana <fdmanana@suse.com>2016-02-15 19:20:26 +0300
committerFilipe Manana <fdmanana@suse.com>2016-02-16 06:41:26 +0300
commit1636d1d77ef4e01e57f706a4cae3371463896136 (patch)
tree0025496d79740f03197c6404c503bc61790745d8 /fs
parentbc4ef7592f657ae81b017207a1098817126ad4cb (diff)
downloadlinux-1636d1d77ef4e01e57f706a4cae3371463896136.tar.xz
Btrfs: fix direct IO requests not reporting IO error to user space
If a bio for a direct IO request fails, we were not setting the error in the parent bio (the main DIO bio), making us not return the error to user space in btrfs_direct_IO(), that is, it made __blockdev_direct_IO() return the number of bytes issued for IO and not the error a bio created and submitted by btrfs_submit_direct() got from the block layer. This essentially happens because when we call: dio_end_io(dio_bio, bio->bi_error); It does not set dio_bio->bi_error to the value of the second argument. So just add this missing assignment in endio callbacks, just as we do in the error path at btrfs_submit_direct() when we fail to clone the dio bio or allocate its private object. This follows the convention of what is done with other similar APIs such as bio_endio() where the caller is responsible for setting the bi_error field in the bio it passes as an argument to bio_endio(). This was detected by the new generic test cases in xfstests: 271, 272, 276 and 278. Which essentially setup a dm error target, then load the error table, do a direct IO write and unload the error table. They expect the write to fail with -EIO, which was not getting reported when testing against btrfs. Cc: stable@vger.kernel.org # 4.3+ Fixes: 4246a0b63bd8 ("block: add a bi_error field to struct bio") Signed-off-by: Filipe Manana <fdmanana@suse.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/inode.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 600bf0d9ceaf..e0ad8b2c2a36 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7985,6 +7985,7 @@ static void btrfs_endio_direct_read(struct bio *bio)
kfree(dip);
+ dio_bio->bi_error = bio->bi_error;
dio_end_io(dio_bio, bio->bi_error);
if (io_bio->end_io)
@@ -8039,6 +8040,7 @@ static void btrfs_endio_direct_write(struct bio *bio)
kfree(dip);
+ dio_bio->bi_error = bio->bi_error;
dio_end_io(dio_bio, bio->bi_error);
bio_put(bio);
}