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dm thin: return ENOSPC instead of EIO when error_if_no_space enabled

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Update the DM thin provisioning target's allocation failure error to be
consistent with commit a9d6ceb8 ("[SCSI] return ENOSPC on thin
provisioning failure").

The DM thin target now returns -ENOSPC rather than -EIO when
block allocation fails due to the pool being out of data space (and
the 'error_if_no_space' thin-pool feature is enabled).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-By: Joe Thornber <ejt@redhat.com>
This commit is contained in:
Mike Snitzer 2014-05-22 14:32:51 -04:00
parent e7a3e871d8
commit af91805a49
3 changed files with 27 additions and 17 deletions
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4
drivers/md/dm-bio-prison.c
View File

@ -238,7 +238,7 @@ void dm_cell_release_no_holder(struct dm_bio_prison *prison,
EXPORT_SYMBOL_GPL(dm_cell_release_no_holder);
void dm_cell_error(struct dm_bio_prison *prison,
struct dm_bio_prison_cell *cell)
struct dm_bio_prison_cell *cell, int error)
{
struct bio_list bios;
struct bio *bio;
@ -251,7 +251,7 @@ void dm_cell_error(struct dm_bio_prison *prison,
spin_unlock_irqrestore(&prison->lock, flags);
while ((bio = bio_list_pop(&bios)))
bio_io_error(bio);
bio_endio(bio, error);
}
EXPORT_SYMBOL_GPL(dm_cell_error);

2
drivers/md/dm-bio-prison.h
View File

@ -85,7 +85,7 @@ void dm_cell_release_no_holder(struct dm_bio_prison *prison,
struct dm_bio_prison_cell *cell,
struct bio_list *inmates);
void dm_cell_error(struct dm_bio_prison *prison,
struct dm_bio_prison_cell *cell);
struct dm_bio_prison_cell *cell, int error);
/*----------------------------------------------------------------*/

38
drivers/md/dm-thin.c
View File

@ -310,13 +310,18 @@ static void cell_defer_no_holder_no_free(struct thin_c *tc,
wake_worker(pool);
}
static void cell_error(struct pool *pool,
struct dm_bio_prison_cell *cell)
static void cell_error_with_code(struct pool *pool,
struct dm_bio_prison_cell *cell, int error_code)
{
dm_cell_error(pool->prison, cell);
dm_cell_error(pool->prison, cell, error_code);
dm_bio_prison_free_cell(pool->prison, cell);
}
static void cell_error(struct pool *pool, struct dm_bio_prison_cell *cell)
{
cell_error_with_code(pool, cell, -EIO);
}
/*----------------------------------------------------------------*/
/*
@ -1027,7 +1032,7 @@ static void retry_on_resume(struct bio *bio)
spin_unlock_irqrestore(&tc->lock, flags);
}
static bool should_error_unserviceable_bio(struct pool *pool)
static int should_error_unserviceable_bio(struct pool *pool)
{
enum pool_mode m = get_pool_mode(pool);
@ -1035,25 +1040,27 @@ static bool should_error_unserviceable_bio(struct pool *pool)
case PM_WRITE:
/* Shouldn't get here */
DMERR_LIMIT("bio unserviceable, yet pool is in PM_WRITE mode");
return true;
return -EIO;
case PM_OUT_OF_DATA_SPACE:
return pool->pf.error_if_no_space;
return pool->pf.error_if_no_space ? -ENOSPC : 0;
case PM_READ_ONLY:
case PM_FAIL:
return true;
return -EIO;
default:
/* Shouldn't get here */
DMERR_LIMIT("bio unserviceable, yet pool has an unknown mode");
return true;
return -EIO;
}
}
static void handle_unserviceable_bio(struct pool *pool, struct bio *bio)
{
if (should_error_unserviceable_bio(pool))
bio_io_error(bio);
int error = should_error_unserviceable_bio(pool);
if (error)
bio_endio(bio, error);
else
retry_on_resume(bio);
}
@ -1062,18 +1069,21 @@ static void retry_bios_on_resume(struct pool *pool, struct dm_bio_prison_cell *c
{
struct bio *bio;
struct bio_list bios;
int error;
if (should_error_unserviceable_bio(pool)) {
cell_error(pool, cell);
error = should_error_unserviceable_bio(pool);
if (error) {
cell_error_with_code(pool, cell, error);
return;
}
bio_list_init(&bios);
cell_release(pool, cell, &bios);
if (should_error_unserviceable_bio(pool))
error = should_error_unserviceable_bio(pool);
if (error)
while ((bio = bio_list_pop(&bios)))
bio_io_error(bio);
bio_endio(bio, error);
else
while ((bio = bio_list_pop(&bios)))
retry_on_resume(bio);