3.2.99-rc1 review patch. If anyone has any objections, please let me know.
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From: Mike Snitzer snitzer@redhat.com
commit 8a74d29d541cd86569139c6f3f44b2d210458071 upstream.
A DM device with a mix of discard capabilities (due to some underlying devices not having discard support) _should_ just return -EOPNOTSUPP for the region of the device that doesn't support discards (even if only by way of the underlying driver formally not supporting discards). BUT, that does ask the underlying driver to handle something that it never advertised support for. In doing so we're exposing users to the potential for a underlying disk driver hanging if/when a discard is issued a the device that is incapable and never claimed to support discards.
Fix this by requiring that each DM target in a DM table provide discard support as a prereq for a DM device to advertise support for discards.
This may cause some configurations that were happily supporting discards (even in the face of a mix of discard support) to stop supporting discards -- but the risk of users hitting driver hangs, and forced reboots, outweighs supporting those fringe mixed discard configurations.
Signed-off-by: Mike Snitzer snitzer@redhat.com [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/md/dm-table.c | 33 ++++++++++++++------------------- 1 file changed, 14 insertions(+), 19 deletions(-)
--- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1584,12 +1584,12 @@ struct mapped_device *dm_table_get_md(st } EXPORT_SYMBOL(dm_table_get_md);
-static int device_discard_capable(struct dm_target *ti, struct dm_dev *dev, - sector_t start, sector_t len, void *data) +static int device_not_discard_capable(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) { struct request_queue *q = bdev_get_queue(dev->bdev);
- return q && blk_queue_discard(q); + return q && !blk_queue_discard(q); }
bool dm_table_supports_discards(struct dm_table *t) @@ -1597,26 +1597,22 @@ bool dm_table_supports_discards(struct d struct dm_target *ti; unsigned i = 0;
- /* - * Unless any target used by the table set discards_supported, - * require at least one underlying device to support discards. - * t->devices includes internal dm devices such as mirror logs - * so we need to use iterate_devices here, which targets - * supporting discard selectively must provide. - */ while (i < dm_table_get_num_targets(t)) { ti = dm_table_get_target(t, i++);
if (!ti->num_discard_requests) - continue; + return false;
- if (ti->discards_supported) - return 1; - - if (ti->type->iterate_devices && - ti->type->iterate_devices(ti, device_discard_capable, NULL)) - return 1; + /* + * Either the target provides discard support (as implied by setting + * 'discards_supported') or it relies on _all_ data devices having + * discard support. + */ + if (!ti->discards_supported && + (!ti->type->iterate_devices || + ti->type->iterate_devices(ti, device_not_discard_capable, NULL))) + return false; }
- return 0; + return true; }