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- Most significant change this cycle is request-based DM now supports

Browse source 
stacking ontop of blk-mq devices.  This blk-mq support changes the
   model request-based DM uses for cloning a request to relying on
   calling blk_get_request() directly from the underlying blk-mq device.
   Early consumer of this code is Intel's emerging NVMe hardware; thanks
   to Keith Busch for working on, and pushing for, these changes.
 
 - A few other small fixes and cleanups across other DM targets.
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Merge tag 'dm-3.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper changes from Mike Snitzer:

 - The most significant change this cycle is request-based DM now
   supports stacking ontop of blk-mq devices.  This blk-mq support
   changes the model request-based DM uses for cloning a request to
   relying on calling blk_get_request() directly from the underlying
   blk-mq device.

   An early consumer of this code is Intel's emerging NVMe hardware;
   thanks to Keith Busch for working on, and pushing for, these changes.

 - A few other small fixes and cleanups across other DM targets.

* tag 'dm-3.20-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm: inherit QUEUE_FLAG_SG_GAPS flags from underlying queues
  dm snapshot: remove unnecessary NULL checks before vfree() calls
  dm mpath: simplify failure path of dm_multipath_init()
  dm thin metadata: remove unused dm_pool_get_data_block_size()
  dm ioctl: fix stale comment above dm_get_inactive_table()
  dm crypt: update url in CONFIG_DM_CRYPT help text
  dm bufio: fix time comparison to use time_after_eq()
  dm: use time_in_range() and time_after()
  dm raid: fix a couple integer overflows
  dm table: train hybrid target type detection to select blk-mq if appropriate
  dm: allocate requests in target when stacking on blk-mq devices
  dm: prepare for allocating blk-mq clone requests in target
  dm: submit stacked requests in irq enabled context
  dm: split request structure out from dm_rq_target_io structure
  dm: remove exports for request-based interfaces without external callers
This commit is contained in:
Linus Torvalds 2015-02-12 16:36:31 -08:00
commit 802ea9d864
17 changed files with 415 additions and 197 deletions
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16
drivers/md/dm-raid.c
View file

@ -1237,7 +1237,7 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
argv++;
/* Skip over RAID params for now and find out # of devices */
if (num_raid_params + 1 > argc) {
if (num_raid_params >= argc) {
ti->error = "Arguments do not agree with counts given";
return -EINVAL;
}
@ -1248,6 +1248,12 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
return -EINVAL;
}
argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
if (argc != (num_raid_devs * 2)) {
ti->error = "Supplied RAID devices does not match the count given";
return -EINVAL;
}
rs = context_alloc(ti, rt, (unsigned)num_raid_devs);
if (IS_ERR(rs))
return PTR_ERR(rs);
@ -1256,16 +1262,8 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
if (ret)
goto bad;
ret = -EINVAL;
argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
argv += num_raid_params + 1;
if (argc != (num_raid_devs * 2)) {
ti->error = "Supplied RAID devices does not match the count given";
goto bad;
}
ret = dev_parms(rs, argv);
if (ret)
goto bad;