diff options
| author |   Christoph Hellwig <hch@lst.de> | 2015-07-20 15:29:37 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2015-07-29 08:55:15 -0600 |
| commit | 4246a0b63bd8f56a1469b12eafeb875b1041a451 (patch) | |
| tree | 3281bb158d658ef7f208ad380c0ecee600a5ab5e /fs/xfs | |
| parent | block: make /sys/block/<dev>/queue/discard_max_bytes writeable (diff) | |
| download | linux-dev-4246a0b63bd8f56a1469b12eafeb875b1041a451.tar.xz linux-dev-4246a0b63bd8f56a1469b12eafeb875b1041a451.zip | |
block: add a bi_error field to struct bio
Currently we have two different ways to signal an I/O error on a BIO:
(1) by clearing the BIO_UPTODATE flag
(2) by returning a Linux errno value to the bi_end_io callback
The first one has the drawback of only communicating a single possible
error (-EIO), and the second one has the drawback of not beeing persistent
when bios are queued up, and are not passed along from child to parent
bio in the ever more popular chaining scenario. Having both mechanisms
available has the additional drawback of utterly confusing driver authors
and introducing bugs where various I/O submitters only deal with one of
them, and the others have to add boilerplate code to deal with both kinds
of error returns.
So add a new bi_error field to store an errno value directly in struct
bio and remove the existing mechanisms to clean all this up.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: NeilBrown <neilb@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/xfs')
| -rw-r--r-- | fs/xfs/xfs_aops.c | 5 | ||||
| -rw-r--r-- | fs/xfs/xfs_buf.c | 7 |
2 files changed, 5 insertions, 7 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 3859f5e27a4d..3714844a81d8 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -351,12 +351,11 @@ xfs_imap_valid( */ STATIC void xfs_end_bio( - struct bio *bio, - int error) + struct bio *bio) { xfs_ioend_t *ioend = bio->bi_private; - ioend->io_error = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : error; + ioend->io_error = bio->bi_error; /* Toss bio and pass work off to an xfsdatad thread */ bio->bi_private = NULL; diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index a4b7d92e946c..01bd6781974e 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -1096,8 +1096,7 @@ xfs_bwrite( STATIC void xfs_buf_bio_end_io( - struct bio *bio, - int error) + struct bio *bio) { xfs_buf_t *bp = (xfs_buf_t *)bio->bi_private; @@ -1105,10 +1104,10 @@ xfs_buf_bio_end_io( * don't overwrite existing errors - otherwise we can lose errors on * buffers that require multiple bios to complete. */ - if (error) { + if (bio->bi_error) { spin_lock(&bp->b_lock); if (!bp->b_io_error) - bp->b_io_error = error; + bp->b_io_error = bio->bi_error; spin_unlock(&bp->b_lock); } |