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dm table: fix DAX iterate_devices based device capability checks 

commit 5b0fab508992c2e120971da658ce80027acbc405 upstream.

Fix dm_table_supports_dax() and invert logic of both
iterate_devices_callout_fn so that all devices' DAX capabilities are
properly checked.

Fixes: 545ed20e6d ("dm: add infrastructure for DAX support")
Cc: stable@vger.kernel.org
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jeffle Xu 2021-02-08 22:34:36 -05:00 committed by Greg Kroah-Hartman
parent b8aedc65db
commit 06ef17b886
3 changed files with 12 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/md/dm-table.c
View File

@ -888,24 +888,24 @@ void dm_table_set_type(struct dm_table *t, enum dm_queue_mode type)
EXPORT_SYMBOL_GPL(dm_table_set_type);
/* validate the dax capability of the target device span */
int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
int blocksize = *(int *) data, id;
bool rc;
id = dax_read_lock();
rc = dax_supported(dev->dax_dev, dev->bdev, blocksize, start, len);
rc = !dax_supported(dev->dax_dev, dev->bdev, blocksize, start, len);
dax_read_unlock(id);
return rc;
}
/* Check devices support synchronous DAX */
static int device_dax_synchronous(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
static int device_not_dax_synchronous_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
return dev->dax_dev && dax_synchronous(dev->dax_dev);
return !dev->dax_dev || !dax_synchronous(dev->dax_dev);
}
bool dm_table_supports_dax(struct dm_table *t,
@ -922,7 +922,7 @@ bool dm_table_supports_dax(struct dm_table *t,
return false;
if (!ti->type->iterate_devices ||
!ti->type->iterate_devices(ti, iterate_fn, blocksize))
ti->type->iterate_devices(ti, iterate_fn, blocksize))
return false;
}
@ -996,7 +996,7 @@ static int dm_table_determine_type(struct dm_table *t)
verify_bio_based:
/* We must use this table as bio-based */
t->type = DM_TYPE_BIO_BASED;
if (dm_table_supports_dax(t, device_supports_dax, &page_size) ||
if (dm_table_supports_dax(t, device_not_dax_capable, &page_size) ||
(list_empty(devices) && live_md_type == DM_TYPE_DAX_BIO_BASED)) {
t->type = DM_TYPE_DAX_BIO_BASED;
} else {
@ -1715,23 +1715,6 @@ static int device_dax_write_cache_enabled(struct dm_target *ti,
return false;
}
static int dm_table_supports_dax_write_cache(struct dm_table *t)
{
struct dm_target *ti;
unsigned i;
for (i = 0; i < dm_table_get_num_targets(t); i++) {
ti = dm_table_get_target(t, i);
if (ti->type->iterate_devices &&
ti->type->iterate_devices(ti,
device_dax_write_cache_enabled, NULL))
return true;
}
return false;
}
static int device_is_rotational(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
@ -1918,15 +1901,15 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
}
blk_queue_write_cache(q, wc, fua);
if (dm_table_supports_dax(t, device_supports_dax, &page_size)) {
if (dm_table_supports_dax(t, device_not_dax_capable, &page_size)) {
blk_queue_flag_set(QUEUE_FLAG_DAX, q);
if (dm_table_supports_dax(t, device_dax_synchronous, NULL))
if (dm_table_supports_dax(t, device_not_dax_synchronous_capable, NULL))
set_dax_synchronous(t->md->dax_dev);
}
else
blk_queue_flag_clear(QUEUE_FLAG_DAX, q);
if (dm_table_supports_dax_write_cache(t))
if (dm_table_any_dev_attr(t, device_dax_write_cache_enabled))
dax_write_cache(t->md->dax_dev, true);
/* Ensure that all underlying devices are non-rotational. */

2
drivers/md/dm.c
View File

@ -1139,7 +1139,7 @@ static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bd
if (!map)
goto out;
ret = dm_table_supports_dax(map, device_supports_dax, &blocksize);
ret = dm_table_supports_dax(map, device_not_dax_capable, &blocksize);
out:
dm_put_live_table(md, srcu_idx);

2
drivers/md/dm.h
View File

@ -74,7 +74,7 @@ void dm_table_free_md_mempools(struct dm_table *t);
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
int *blocksize);
int device_supports_dax(struct dm_target *ti, struct dm_dev *dev,
int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data);
void dm_lock_md_type(struct mapped_device *md);