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authorJosef Bacik <josef@redhat.com>2011-04-06 14:53:07 -0400
committerJosef Bacik <josef@redhat.com>2011-04-08 13:00:41 -0400
commit16d299ac7446b5a75c5683a9ae11d7907d444c86 (patch)
tree95358c2fdd7af672ec68c18fb43e2e90a7cd4551 /fs
parent1ae399382512b3e4d6c923e53da9e45935577040 (diff)
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Btrfs: reuse the extent_map we found when calling btrfs_get_extent
In btrfs_get_block_direct we call btrfs_get_extent to lookup the extent for the range that we are looking for. If we don't find an extent, btrfs_get_extent will insert a extent_map for that area and mark it as a hole. So it does the job of allocating a new extent map and inserting it into the io tree. But if we're creating a new extent we free it up and redo all of that work. So instead pass the em to btrfs_new_extent_direct(), and if it will work just allocate the disk space and set it up properly and bypass the freeing/allocating of a new extent map and the expensive operation of inserting the thing into the io_tree. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/btrfs/inode.c36
1 files changed, 28 insertions, 8 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 2bb76c6157a4..24310c9cb14f 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -5445,17 +5445,30 @@ out:
}
static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
+ struct extent_map *em,
u64 start, u64 len)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
- struct extent_map *em;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct btrfs_key ins;
u64 alloc_hint;
int ret;
+ bool insert = false;
- btrfs_drop_extent_cache(inode, start, start + len - 1, 0);
+ /*
+ * Ok if the extent map we looked up is a hole and is for the exact
+ * range we want, there is no reason to allocate a new one, however if
+ * it is not right then we need to free this one and drop the cache for
+ * our range.
+ */
+ if (em->block_start != EXTENT_MAP_HOLE || em->start != start ||
+ em->len != len) {
+ free_extent_map(em);
+ em = NULL;
+ insert = true;
+ btrfs_drop_extent_cache(inode, start, start + len - 1, 0);
+ }
trans = btrfs_join_transaction(root, 0);
if (IS_ERR(trans))
@@ -5471,10 +5484,12 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
goto out;
}
- em = alloc_extent_map(GFP_NOFS);
if (!em) {
- em = ERR_PTR(-ENOMEM);
- goto out;
+ em = alloc_extent_map(GFP_NOFS);
+ if (!em) {
+ em = ERR_PTR(-ENOMEM);
+ goto out;
+ }
}
em->start = start;
@@ -5484,9 +5499,15 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
em->block_start = ins.objectid;
em->block_len = ins.offset;
em->bdev = root->fs_info->fs_devices->latest_bdev;
+
+ /*
+ * We need to do this because if we're using the original em we searched
+ * for, we could have EXTENT_FLAG_VACANCY set, and we don't want that.
+ */
+ em->flags = 0;
set_bit(EXTENT_FLAG_PINNED, &em->flags);
- while (1) {
+ while (insert) {
write_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
write_unlock(&em_tree->lock);
@@ -5704,8 +5725,7 @@ must_cow:
* it above
*/
len = bh_result->b_size;
- free_extent_map(em);
- em = btrfs_new_extent_direct(inode, start, len);
+ em = btrfs_new_extent_direct(inode, em, start, len);
if (IS_ERR(em))
return PTR_ERR(em);
len = min(len, em->len - (start - em->start));