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  1. 29 Oct, 2010 3 commits
    • Josef Bacik's avatar
      Btrfs: check cache->caching_ctl before returning if caching has started · dde5abee
      Josef Bacik authored 
      With the free space disk caching we can mark the block group as started with the
caching, but we don't have a caching ctl.  This can race with anybody else who
tries to get the caching ctl before we cache (this is very hard to do btw).  So
instead check to see if cache->caching_ctl is set, and if not return NULL.
Thanks,
Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      dde5abee
    • Josef Bacik's avatar
      Btrfs: load free space cache if it exists · 9d66e233
      Josef Bacik authored 
      This patch actually loads the free space cache if it exists.  The only thing
that really changes here is that we need to cache the block group if we're going
to remove an extent from it.  Previously we did not do this since the caching
kthread would pick it up.  With the on disk cache we don't have this luxury so
we need to make sure we read the on disk cache in first, and then remove the
extent, that way when the extent is unpinned the free space is added to the
block group.  This has been tested with all sorts of things.
Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      9d66e233
    • Josef Bacik's avatar
      Btrfs: write out free space cache · 0cb59c99
      Josef Bacik authored 
      This is a simple bit, just dump the free space cache out to our preallocated
inode when we're writing out dirty block groups.  There are a bunch of changes
in inode.c in order to account for special cases.  Mostly when we're doing the
writeout we're holding trans_mutex, so we need to use the nolock transacation
functions.  Also we can't do asynchronous completions since the async thread
could be blocked on already completed IO waiting for the transaction lock.  This
has been tested with xfstests and btrfs filesystem balance, as well as my ENOSPC
tests.  Thanks,
Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      0cb59c99
  3. 28 Oct, 2010 1 commit
    • Josef Bacik's avatar
      Btrfs: create special free space cache inode · 0af3d00b
      Josef Bacik authored 
      In order to save free space cache, we need an inode to hold the data, and we
need a special item to point at the right inode for the right block group.  So
first, create a special item that will point to the right inode, and the number
of extent entries we will have and the number of bitmaps we will have.  We
truncate and pre-allocate space everytime to make sure it's uptodate.

This feature will be turned on as soon as you mount with -o space_cache, however
it is safe to boot into old kernels, they will just generate the cache the old
fashion way.  When you boot back into a newer kernel we will notice that we
modified and not the cache and automatically discard the cache.
Signed-off-by: default avatarJosef Bacik <josef@redhat.com>
      0af3d00b
  5. 20 Oct, 2010 5 commits
  7. 19 Oct, 2010 7 commits
  9. 18 Oct, 2010 18 commits
  11. 17 Oct, 2010 4 commits
  13. 16 Oct, 2010 2 commits
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