This is a note to let you know that I've just added the patch titled
dm flakey: fix reads to be issued if drop_writes configured
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-flakey-fix-reads-to-be-issued-if-drop_writes-configured.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 299f6230bc6d0ccd5f95bb0fb865d80a9c7d5ccc Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@xxxxxxxxxx>
Date: Wed, 24 Aug 2016 21:12:58 -0400
Subject: dm flakey: fix reads to be issued if drop_writes configured
From: Mike Snitzer <snitzer@xxxxxxxxxx>
commit 299f6230bc6d0ccd5f95bb0fb865d80a9c7d5ccc upstream.
v4.8-rc3 commit 99f3c90d0d ("dm flakey: error READ bios during the
down_interval") overlooked the 'drop_writes' feature, which is meant to
allow reads to be issued rather than errored, during the down_interval.
Fixes: 99f3c90d0d ("dm flakey: error READ bios during the down_interval")
Reported-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-flakey.c | 27 ++++++++++++++++-----------
1 file changed, 16 insertions(+), 11 deletions(-)
--- a/drivers/md/dm-flakey.c
+++ b/drivers/md/dm-flakey.c
@@ -289,15 +289,13 @@ static int flakey_map(struct dm_target *
pb->bio_submitted = true;
/*
- * Map reads as normal only if corrupt_bio_byte set.
+ * Error reads if neither corrupt_bio_byte or drop_writes are set.
+ * Otherwise, flakey_end_io() will decide if the reads should be modified.
*/
if (bio_data_dir(bio) == READ) {
- /* If flags were specified, only corrupt those that match. */
- if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&
- all_corrupt_bio_flags_match(bio, fc))
- goto map_bio;
- else
+ if (!fc->corrupt_bio_byte && !test_bit(DROP_WRITES, &fc->flags))
return -EIO;
+ goto map_bio;
}
/*
@@ -334,14 +332,21 @@ static int flakey_end_io(struct dm_targe
struct flakey_c *fc = ti->private;
struct per_bio_data *pb = dm_per_bio_data(bio, sizeof(struct per_bio_data));
- /*
- * Corrupt successful READs while in down state.
- */
if (!error && pb->bio_submitted && (bio_data_dir(bio) == READ)) {
- if (fc->corrupt_bio_byte)
+ if (fc->corrupt_bio_byte && (fc->corrupt_bio_rw == READ) &&
+ all_corrupt_bio_flags_match(bio, fc)) {
+ /*
+ * Corrupt successful matching READs while in down state.
+ */
corrupt_bio_data(bio, fc);
- else
+
+ } else if (!test_bit(DROP_WRITES, &fc->flags)) {
+ /*
+ * Error read during the down_interval if drop_writes
+ * wasn't configured.
+ */
return -EIO;
+ }
}
return error;
Patches currently in stable-queue which might be from snitzer@xxxxxxxxxx are
queue-4.7/dm-flakey-fix-reads-to-be-issued-if-drop_writes-configured.patch
queue-4.7/dm-crypt-fix-error-with-too-large-bios.patch
queue-4.7/dm-log-writes-fix-check-of-kthread_run-return-value.patch
queue-4.7/dm-log-writes-move-io-accounting-earlier-to-fix-error-path.patch
queue-4.7/dm-crypt-fix-free-of-bad-values-after-tfm-allocation-failure.patch
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