Dear list,
This is V4 of batched discard support, now we will get full mapping of
the free space on each device for RAID0/1/10/DUP instead of just a single
stripe length, and tested with xfsstests 251, Thanks.
Changelog V4:
*make btrfs_map_block() return full mapping.
Changelog V3:
*fix style problems.
*rebase to 2.6.38-rc7.
Changelog V2:
*Check if we have devices support trim before trying to trim the fs, also adjust
minlen according to the discard_granularity.
*Update reserved extent calculations in btrfs_trim_block_group().
*Call cond_resched() without checking need_resched()
*Use bitmap_clear_bits() and unlink_free_space() instead of btrfs_remove_free_space(),
so we won't search the same extent for twice.
*Try harder in btrfs_discard_extent(), now we won't report errors
if it's not a EOPNOTSUPP.
*make sure the block group is cached before trimming it,or we'll see an empty caching
tree if the block group is not cached.
*Minor return value fix in btrfs_discard_block_group().
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