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authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>2011-07-14 03:19:45 +0000
committerChris Mason <chris.mason@oracle.com>2011-08-01 14:32:39 -0400
commit69261c4b6a394ead1b5ca2966c908469355eb603 (patch)
tree3bd8ae6f65473887bc3aab381eea38bfb6b6e8ca /fs
parentded91f0814a349e36b3ca0eff497f816ad518fba (diff)
downloadop-kernel-dev-69261c4b6a394ead1b5ca2966c908469355eb603.zip
op-kernel-dev-69261c4b6a394ead1b5ca2966c908469355eb603.tar.gz
Btrfs: clean up for find_first_extent_bit()
find_first_extent_bit() and find_first_extent_bit_state() share most of the code, and we can just make the former call the latter. Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/extent_io.c64
1 files changed, 24 insertions, 40 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index a0811e6..a59ebc6 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1031,46 +1031,6 @@ static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
return 0;
}
-/*
- * find the first offset in the io tree with 'bits' set. zero is
- * returned if we find something, and *start_ret and *end_ret are
- * set to reflect the state struct that was found.
- *
- * If nothing was found, 1 is returned, < 0 on error
- */
-int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
- u64 *start_ret, u64 *end_ret, int bits)
-{
- struct rb_node *node;
- struct extent_state *state;
- int ret = 1;
-
- spin_lock(&tree->lock);
- /*
- * this search will find all the extents that end after
- * our range starts.
- */
- node = tree_search(tree, start);
- if (!node)
- goto out;
-
- while (1) {
- state = rb_entry(node, struct extent_state, rb_node);
- if (state->end >= start && (state->state & bits)) {
- *start_ret = state->start;
- *end_ret = state->end;
- ret = 0;
- break;
- }
- node = rb_next(node);
- if (!node)
- break;
- }
-out:
- spin_unlock(&tree->lock);
- return ret;
-}
-
/* find the first state struct with 'bits' set after 'start', and
* return it. tree->lock must be held. NULL will returned if
* nothing was found after 'start'
@@ -1103,6 +1063,30 @@ out:
}
/*
+ * find the first offset in the io tree with 'bits' set. zero is
+ * returned if we find something, and *start_ret and *end_ret are
+ * set to reflect the state struct that was found.
+ *
+ * If nothing was found, 1 is returned, < 0 on error
+ */
+int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, int bits)
+{
+ struct extent_state *state;
+ int ret = 1;
+
+ spin_lock(&tree->lock);
+ state = find_first_extent_bit_state(tree, start, bits);
+ if (state) {
+ *start_ret = state->start;
+ *end_ret = state->end;
+ ret = 0;
+ }
+ spin_unlock(&tree->lock);
+ return ret;
+}
+
+/*
* find a contiguous range of bytes in the file marked as delalloc, not
* more than 'max_bytes'. start and end are used to return the range,
*
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