2.5.51-dm-1

A new stable release of dm for 2.5.51 is available:

http://people.sistina.com/~thornber/patches/2.5-stable/2.5.51/

Changes
-------

Revision 1:
Four constants:

     DM_DIR,
     DM_MAX_TYPE_NAME,
     DM_NAME_LEN,
     DM_UUID_LEN

Were being declared in device-mapper.h, these are all specific to the ioctl interface, so they've been moved to dm-ioctl.h. Nobody in userland should ever include <linux/device-mapper.h> so remove ifdef __KERNEL guards.

Revision 2:
An error value was not being checked correctly in open_dev(). [Kevin Corry]

Revision 3:
Return -ENOTBLK if lookup_device() finds the inode, but it is not a block device. [Cristoph Hellwig]

Revision 4:
No need to validate the parameters if we are doing a REMOVE_ALL command.

Revision 5:
check_device_area was comparing the bytes with sectors. [Stefan Lauterbach]

Revision 6:
minor change for dm-strip.c. Tests for correct chunksize before it allocates the stripe context. [Heinz Mauelshagen]

Revision 7:
There's a bug in the dm-stripe.c constructor failing top check if enough destinations are handed in. [Heinz Mauelshagen]

Revision 8:
Give each device its own io mempool to avoid a potential deadlock with stacked devices. [HM + EJT]

Revision 9:
queue_io() was checking the DMF_SUSPENDED flag rather than the new DMF_BLOCK_IO flag. This meant suspend could deadlock under load.

Revision 10:
dm_suspend(): Stop holding the read lock around the while loop that waits for pending io to complete.

Revision 11:
Add a blk_run_queues() call to encourage pending io to flush when we're doing a dm_suspend().

Revision 12:
dec_pending(): only bother spin locking if io->error is going to be updated. [Kevin Corry]

Revision 13:
md->pending was being incremented for each clone rather than just once. [Kevin Corry]

Revision 14:
Some fields in the duplicated bio weren't being set up properly in __split_page(). [Kevin Corry]

Revision 15:
Remove some paranoia in highmem.c, need to check this with Jens Axboe.

Revision 16:
Remove verbose debug message 'Splitting page'.