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- Another stable fix for DM flakey (that tweaks the previous fix that

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didn't factor in expected 'drop_writes' behavior for read IO).
 
 - A dm-log bio operation flags fix for the broader block changes that
   were merged during the 4.8 merge window.
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Merge tag 'dm-4.8-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - another stable fix for DM flakey (that tweaks the previous fix that
   didn't factor in expected 'drop_writes' behavior for read IO).

 - a dm-log bio operation flags fix for the broader block changes that
   were merged during the 4.8 merge window.

* tag 'dm-4.8-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm log: fix unitialized bio operation flags
  dm flakey: fix reads to be issued if drop_writes configured
This commit is contained in:
Linus Torvalds 2016-08-26 20:15:32 -07:00
commit 6ec675ede9
2 changed files with 22 additions and 16 deletions
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27
drivers/md/dm-flakey.c
View File

@ -289,15 +289,13 @@ static int flakey_map(struct dm_target *ti, struct bio *bio)
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_target *ti, struct bio *bio, int error)
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;

11
drivers/md/dm-log.c
View File

@ -291,9 +291,10 @@ static void header_from_disk(struct log_header_core *core, struct log_header_dis
core->nr_regions = le64_to_cpu(disk->nr_regions);
}
static int rw_header(struct log_c *lc, int rw)
static int rw_header(struct log_c *lc, int op)
{
lc->io_req.bi_op = rw;
lc->io_req.bi_op = op;
lc->io_req.bi_op_flags = 0;
return dm_io(&lc->io_req, 1, &lc->header_location, NULL);
}
@ -316,7 +317,7 @@ static int read_header(struct log_c *log)
{
int r;
r = rw_header(log, READ);
r = rw_header(log, REQ_OP_READ);
if (r)
return r;
@ -630,7 +631,7 @@ static int disk_resume(struct dm_dirty_log *log)
header_to_disk(&lc->header, lc->disk_header);
/* write the new header */
r = rw_header(lc, WRITE);
r = rw_header(lc, REQ_OP_WRITE);
if (!r) {
r = flush_header(lc);
if (r)
@ -698,7 +699,7 @@ static int disk_flush(struct dm_dirty_log *log)
log_clear_bit(lc, lc->clean_bits, i);
}
r = rw_header(lc, WRITE);
r = rw_header(lc, REQ_OP_WRITE);
if (r)
fail_log_device(lc);
else {