linux.git/drivers/md/dm-snap.c, branch v2.6.25

dm io: write error bits form long not int

2008-03-28T21:45:23+00:00

write_err is an unsigned long used with set_bit() so should not be passed
around as unsigned int.

http://bugzilla.kernel.org/show_bug.cgi?id=10271

Signed-off-by: Alasdair G Kergon 
Cc: Heiko Carstens 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

dm snapshot: combine consecutive exceptions in memory

2008-02-08T02:11:27+00:00

Provided sector_t is 64 bits, reduce the in-memory footprint of the
snapshot exception table by the simple method of using unused bits of
the chunk number to combine consecutive entries.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon

dm snapshot: use rounddown_pow_of_two

2008-02-08T02:10:06+00:00

Since the source file already includes the log2.h header file, it
seems pointless to re-invent the necessary routine.

Signed-off-by: Robert P. J. Day 
Signed-off-by: Alasdair G Kergon

dm: use is_power_of_2

2007-10-20T01:01:06+00:00

Replacing n & (n - 1) for power of 2 check by is_power_of_2(n)

Signed-off-by: vignesh babu 
Signed-off-by: Alasdair G Kergon

Drop 'size' argument from bio_endio and bi_end_io

2007-10-10T07:25:57+00:00

As bi_end_io is only called once when the reqeust is complete,
the 'size' argument is now redundant.  Remove it.

Now there is no need for bio_endio to subtract the size completed
from bi_size.  So don't do that either.

While we are at it, change bi_end_io to return void.

Signed-off-by: Neil Brown 
Signed-off-by: Jens Axboe

dm: disable barriers

2007-07-12T22:01:08+00:00

This patch causes device-mapper to reject any barrier requests.  This is done
since most of the targets won't handle this correctly anyway.  So until the
situation improves it is better to reject these requests at the first place.
Since barrier requests won't get to the targets, the checks there can be
removed.

Cc: stable@kernel.org
Signed-off-by: Stefan Bader 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Linus Torvalds

dm snapshot: permit invalid activation

2007-07-12T22:01:08+00:00

Allow invalid snapshots to be activated instead of failing.

This allows userspace to reinstate any given snapshot state - for
example after an unscheduled reboot - and clean up the invalid snapshot
at its leisure.

Cc: stable@kernel.org
Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Linus Torvalds

dm: use kmem_cache macro

2007-07-12T22:01:08+00:00

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 
Signed-off-by: Alasdair G Kergon 
Signed-off-by: Linus Torvalds

[PATCH] make drivers/md/dm-snap.c:ksnapd static

2006-12-08T16:29:09+00:00

Signed-off-by: Adrian Bunk 
Acked-by: Alasdair G Kergon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] dm: snapshot: abstract memory release

2006-12-08T16:29:09+00:00

Move the code that releases memory used by a snapshot into a separate function.

Signed-off-by: Milan Broz 
Signed-off-by: Alasdair G Kergon 
Cc: dm-devel@redhat.com
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds