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Btrfs: Reorder tests in set_extent_bit to properly find holes

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Yan Zheng noticed that set_extent_bit was exiting too early when there
was a hole in the map.  The fix is to reorder the tests to check for the
hole first.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-09-10 20:00:27 -04:00 committed by David Woodhouse
parent 011410bd85
commit a8c450b211
1 changed files with 22 additions and 22 deletions
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44
fs/btrfs/extent_map.c
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@ -712,28 +712,6 @@ int set_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits,
}
goto search_again;
}
/*
* | ---- desired range ---- |
* | state |
* We need to split the extent, and set the bit
* on the first half
*/
if (state->start <= end && state->end > end) {
set = state->state & bits;
if (exclusive && set) {
*failed_start = start;
err = -EEXIST;
goto out;
}
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
prealloc->state |= bits;
merge_state(tree, prealloc);
prealloc = NULL;
goto out;
}
/*
* | ---- desired range ---- |
* | state | or | state |
@ -756,6 +734,28 @@ int set_extent_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits,
start = this_end + 1;
goto search_again;
}
/*
* | ---- desired range ---- |
* | state |
* We need to split the extent, and set the bit
* on the first half
*/
if (state->start <= end && state->end > end) {
set = state->state & bits;
if (exclusive && set) {
*failed_start = start;
err = -EEXIST;
goto out;
}
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
prealloc->state |= bits;
merge_state(tree, prealloc);
prealloc = NULL;
goto out;
}
goto search_again;
out: