pm24.git/include/linux/device-mapper.h, branch v3.7-rc8

dm thin: commit before gathering status

2012-07-27T14:08:16Z

Commit outstanding metadata before returning the status for a dm thin pool so that the numbers reported are as up-to-date as possible. The commit is not performed if the device is suspended or if the DM_NOFLUSH_FLAG is supplied by userspace and passed to the target through a new 'status_flags' parameter in the target's dm_status_fn. The userspace dmsetup tool will support the --noflush flag with the 'dmsetup status' and 'dmsetup wait' commands from version 1.02.76 onwards. Tested-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

dm: use bool bitfields in struct dm_target

2012-07-27T14:08:08Z

Use boolean bit fields for flags in struct dm_target. Signed-off-by: Alasdair G Kergon

dm: allow targets to request flushes regardless of underlying device support

2012-07-27T14:08:07Z

Allow targets to override the 'supports flush' calculation. Set 'flush_supported' if a target needs to receive flushes regardless of whether or not its underlying devices have support. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

dm: introduce split_discard_requests

2012-07-27T14:08:03Z

This patch introduces a new variable split_discard_requests. It can be set by targets so that discard requests are split on max_io_len boundaries. When split_discard_requests is not set, discard requests are only split on boundaries between targets, as was the case before this patch. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon

dm: support non power of two target max_io_len

2012-07-27T14:08:00Z

Remove the restriction that limits a target's specified maximum incoming I/O size to be a power of 2. Rename this setting from 'split_io' to the less-ambiguous 'max_io_len'. Change it from sector_t to uint32_t, which is plenty big enough, and introduce a wrapper function dm_set_target_max_io_len() to set it. Use sector_div() to process it now that it is not necessarily a power of 2. Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

dm: remove unused flush target method

2012-07-27T14:07:58Z

Remove unused dm_flush_fn .flush target method from header. This was left-over from the FLUSH/FUA conversion and is no longer used. Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon

dm table: add immutable feature

2011-10-31T20:19:04Z

Introduce DM_TARGET_IMMUTABLE to indicate that the target type cannot be mixed with any other target type, and once loaded into a device, it cannot be replaced with a table containing a different type. The thin provisioning pool device will use this. Signed-off-by: Alasdair G Kergon

dm table: add always writeable feature

2011-10-31T20:19:02Z

Add a target feature flag DM_TARGET_ALWAYS_WRITEABLE to indicate that a target does not support read-only mode. The initial implementation of the thin provisioning target uses this. Signed-off-by: Alasdair G Kergon

dm table: add singleton feature

2011-10-31T20:19:00Z

Introduce the concept of a singleton table which contains exactly one target. If a target type sets the DM_TARGET_SINGLETON feature bit device-mapper will ensure that any table that includes that target contains no others. The thin provisioning pool target uses this. Signed-off-by: Alasdair G Kergon

dm: use local printk ratelimit

2011-10-31T20:18:54Z

printk_ratelimit() shares global ratelimiting state with all other subsystems, so its usage is discouraged. Instead, define and use dm's local state. Signed-off-by: Namhyung Kim Signed-off-by: Alasdair G Kergon