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authorChris Mason <clm@fb.com>2015-04-06 21:46:08 +0200
committerChris Mason <clm@fb.com>2015-04-10 23:07:22 +0200
commit1bbc621ef28462456131c035eaeb5567a1a2a2fe (patch)
treed2c9e87e9cef8884a440bc9b6a5bf6574eff9fc7 /fs/affs
parentBtrfs: don't use highmem for free space cache pages (diff)
downloadlinux-1bbc621ef28462456131c035eaeb5567a1a2a2fe.tar.xz
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Btrfs: allow block group cache writeout outside critical section in commit
We loop through all of the dirty block groups during commit and write the free space cache. In order to make sure the cache is currect, we do this while no other writers are allowed in the commit. If a large number of block groups are dirty, this can introduce long stalls during the final stages of the commit, which can block new procs trying to change the filesystem. This commit changes the block group cache writeout to take appropriate locks and allow it to run earlier in the commit. We'll still have to redo some of the block groups, but it means we can get most of the work out of the way without blocking the entire FS. Signed-off-by: Chris Mason <clm@fb.com>
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