kernel/linux.git/include/linux/genhd.h, branch linux-2.6.28.y

block: include empty disks in /proc/diskstats

2009-05-02T17:57:17+00:00

commit 71982a409f12c50d011325a4471aa20666bb908d upstream. /proc/diskstats used to show stats for all disks whether they're zero-sized or not and their non-zero partitions. Commit 074a7aca7afa6f230104e8e65eba3420263714a5 accidentally changed the behavior such that it doesn't print out zero sized disks. This patch implements DISK_PITER_INCL_EMPTY_PART0 flag to partition iterator and uses it in diskstats_show() such that empty part0 is shown in /proc/diskstats. Reported and bisectd by Dianel Collins. Signed-off-by: Tejun Heo Reported-by: Daniel Collins Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman

block: make add_partition() return pointer to hd_struct

2008-11-18T14:08:56+00:00

Make add_partition() return pointer to the new hd_struct on success and ERR_PTR() value on failure. This change will be used to fix md autodetection bug. Signed-off-by: Tejun Heo Cc: Neil Brown Signed-off-by: Jens Axboe

proc: move /proc/diskstats boilerplate to block/genhd.c

2008-10-23T13:57:37+00:00

Signed-off-by: Alexey Dobriyan Acked-by: Jens Axboe

proc: move rest of /proc/partitions code to block/genhd.c

2008-10-23T11:07:31+00:00

Signed-off-by: Alexey Dobriyan Acked-by: Jens Axboe

block: allow disk to have extended device number

2008-10-09T06:56:08+00:00

Now that disk and partition handlings are mostly unified, it's easy to allow disk to have extended device number. This patch makes add_disk() use extended device number if disk->minors is zero. Both sd and ide-disk are updated to use this. * sd_format_disk_name() is implemented which can generically determine the drive name. This removes disk number restriction stemming from limited device names. * If sd index goes over SD_MAX_DISKS (which can be increased now BTW), sd simply doesn't initialize minors letting block layer choose extended device number. * If CONFIG_DEBUG_EXT_DEVT is set, both sd and ide-disk always set minors to 0 and use extended device numbers. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

block: replace @ext_minors with GENHD_FL_EXT_DEVT

2008-10-09T06:56:08+00:00

With previous changes, it's meaningless to limit the number of partitions. Replace @ext_minors with GENHD_FL_EXT_DEVT such that setting the flag allows the disk to have maximum number of allowed partitions (only limited by the number of entries in parsed_partitions as determined by MAX_PART constant). This kills not-too-pretty alloc_disk_ext[_node]() functions and makes @minors parameter to alloc_disk[_node]() unnecessary. The parameter is left alone to avoid disturbing the users. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

block: make partition array dynamic

2008-10-09T06:56:08+00:00

disk->__part used to be statically allocated to the maximum possible number of partitions. This patch makes partition array allocation dynamic. The added overhead is minimal as only real change is one memory dereference changed to RCU one. This saves both a bit of memory and cpu cycles iterating through unoccupied slots and makes increasing partition limit easier. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

block: move stats from disk to part0

2008-10-09T06:56:08+00:00

Move stats related fields - stamp, in_flight, dkstats - from disk to part0 and unify stat handling such that... * part_stat_*() now updates part0 together if the specified partition is not part0. ie. part_stat_*() are now essentially all_stat_*(). * {disk|all}_stat_*() are gone. * part_round_stats() is updated similary. It handles part0 stats automatically and disk_round_stats() is killed. * part_{inc|dec}_in_fligh() is implemented which automatically updates part0 stats for parts other than part0. * disk_map_sector_rcu() is updated to return part0 if no part matches. Combined with the above changes, this makes NULL special case handling in callers unnecessary. * Separate stats show code paths for disk are collapsed into part stats show code paths. * Rename disk_stat_lock/unlock() to part_stat_lock/unlock() While at it, reposition stat handling macros a bit and add missing parentheses around macro parameters. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

block: kill GENHD_FL_FAIL and use part0->make_it_fail

2008-10-09T06:56:08+00:00

GENHD_FL_FAIL for disk is what make_it_fail is for parts. Kill it and use part0->make_it_fail. Sysfs node handling is unified too. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe

block: always set bdev->bd_part

2008-10-09T06:56:08+00:00

Till now, bdev->bd_part is set only if the bdev was for parts other than part0. This patch makes bdev->bd_part always set so that code paths don't have to differenciate common handling. Signed-off-by: Tejun Heo Signed-off-by: Jens Axboe