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Btrfs: fix the allocator loop logic 

I was testing with empty_cluster = 0 to try and reproduce a problem and kept
hitting early enospc panics.  This was because our loop logic was a little
confused.  So this is what I did

1) Make the loop variable the ultimate decider on wether we should loop again
isntead of checking to see if we had an uncached bg, empty size or empty
cluster.

2) Increment loop before checking to see what we are on to make the loop
definitions make more sense.

3) If we are on the chunk alloc loop don't set empty_size/empty_cluster to 0
unless we didn't actually allocate a chunk.  If we did allocate a chunk we
should be able to easily setup a new cluster so clearing
empty_size/empty_cluster makes us less efficient.

This kept me from hitting panics while trying to reproduce the other problem.
Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
wifi-calibration
Josef Bacik 2011-05-27 16:11:38 -04:00
parent 2cdc342c20
commit 723bda2083
1 changed files with 25 additions and 23 deletions
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48
fs/btrfs/extent-tree.c
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@ -5218,9 +5218,7 @@ loop:
* LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
* again
*/
if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE &&
(found_uncached_bg || empty_size || empty_cluster ||
allowed_chunk_alloc)) {
if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE) {
index = 0;
if (loop == LOOP_FIND_IDEAL && found_uncached_bg) {
found_uncached_bg = false;
@ -5260,32 +5258,36 @@ loop:
goto search;
}
if (loop < LOOP_CACHING_WAIT) {
loop++;
goto search;
}
loop++;
if (loop == LOOP_ALLOC_CHUNK) {
if (allowed_chunk_alloc) {
ret = do_chunk_alloc(trans, root, num_bytes +
2 * 1024 * 1024, data,
CHUNK_ALLOC_LIMITED);
allowed_chunk_alloc = 0;
if (ret == 1)
done_chunk_alloc = 1;
} else if (!done_chunk_alloc &&
space_info->force_alloc ==
CHUNK_ALLOC_NO_FORCE) {
space_info->force_alloc = CHUNK_ALLOC_LIMITED;
}
/*
* We didn't allocate a chunk, go ahead and drop the
* empty size and loop again.
*/
if (!done_chunk_alloc)
loop = LOOP_NO_EMPTY_SIZE;
}
if (loop == LOOP_NO_EMPTY_SIZE) {
empty_size = 0;
empty_cluster = 0;
}
if (allowed_chunk_alloc) {
ret = do_chunk_alloc(trans, root, num_bytes +
2 * 1024 * 1024, data,
CHUNK_ALLOC_LIMITED);
allowed_chunk_alloc = 0;
done_chunk_alloc = 1;
} else if (!done_chunk_alloc &&
space_info->force_alloc == CHUNK_ALLOC_NO_FORCE) {
space_info->force_alloc = CHUNK_ALLOC_LIMITED;
}
if (loop < LOOP_NO_EMPTY_SIZE) {
loop++;
goto search;
}
ret = -ENOSPC;
goto search;
} else if (!ins->objectid) {
ret = -ENOSPC;
} else if (ins->objectid) {