Commit Graph

8 Commits

Author SHA1 Message Date
Mikulas Patocka 10d3bd09a3 dm: consolidate target deregistration error handling
Change dm_unregister_target to return void and use BUG() for error
reporting.

dm_unregister_target can only fail because of programming bug in the
target driver. It can't fail because of user's behavior or disk errors.

This patch changes unregister_target to return void and use BUG if
someone tries to unregister non-registered target or unregister target
that is in use.

This patch removes code duplication (testing of error codes in all dm
targets) and reports bugs in just one place, in dm_unregister_target. In
some target drivers, these return codes were ignored, which could lead
to a situation where bugs could be missed.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2009-01-06 03:04:58 +00:00
Mikulas Patocka 586e80e6ee dm: remove dm header from targets
Change #include "dm.h" to #include <linux/device-mapper.h> in all targets.
Targets should not need direct access to internal DM structures.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2008-10-21 17:44:59 +01:00
Alasdair G Kergon 051814c69f dm: bio_list macro renaming
Remove BIO_LIST and DEFINE_BIO_LIST macros that gain us nothing
since contents are initialised to NULL.

Cc: Jan Engelhardt <jengelh@linux01.gwdg.de>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2007-10-20 02:01:11 +01:00
Milan Broz 79662d1ea3 dm delay: fix status
Fix missing space in dm-delay target status output
if separate read and write delay are configured.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2007-10-20 02:01:04 +01:00
Dmitry Monakhov 2e64a0f928 dm delay: fix ctr error paths
Add missing 'dm_put_device' to dm-delay target constructor.

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2007-10-20 02:01:02 +01:00
Alasdair G Kergon ac818646d4 dm delay: cleanup
Use setup_timer().
Replace semaphore with mutex.

Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-12 15:01:08 -07:00
Alasdair G Kergon 028867ac28 dm: use kmem_cache macro
Use new KMEM_CACHE() macro and make the newly-exposed structure names more
meaningful.  Also remove some superfluous casts and inlines (let a modern
compiler be the judge).

Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-12 15:01:08 -07:00
Heinz Mauelshagen 26b9f22870 dm: delay target
New device-mapper target that can delay I/O (for testing).  Reads can be
separated from writes, redirected to different underlying devices and delayed
by differing amounts of time.

Signed-off-by: Heinz Mauelshagen <mauelshagen@redhat.com>
Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-09 12:30:47 -07:00