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authorChris Mason <chris.mason@oracle.com>2008-08-15 15:34:18 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:06 -0400
commit53863232ef961778aa414b700ed88a48e8e871e6 (patch)
tree05a74ac264a5fb4f6b8824771f5820ca5907afe5 /fs/btrfs/file-item.c
parent4854ddd0ed0a687fc2d7c45a529c406232e31e7b (diff)
Btrfs: Lower contention on the csum mutex
This takes the csum mutex deeper in the call chain and releases it more often. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/file-item.c')
-rw-r--r--fs/btrfs/file-item.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 51aba8cee7c..9454e0a07c8 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -321,6 +321,7 @@ again:
file_key.offset = offset;
btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY);
+ mutex_lock(&BTRFS_I(inode)->csum_mutex);
item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1);
if (!IS_ERR(item)) {
leaf = path->nodes[0];
@@ -367,7 +368,7 @@ again:
ret = btrfs_search_slot(trans, root, &file_key, path,
BTRFS_CRC32_SIZE, 1);
if (ret < 0)
- goto fail;
+ goto fail_unlock;
if (ret == 0) {
BUG();
}
@@ -411,10 +412,10 @@ insert:
ret = btrfs_insert_empty_item(trans, root, path, &file_key,
ins_size);
if (ret < 0)
- goto fail;
+ goto fail_unlock;
if (ret != 0) {
WARN_ON(1);
- goto fail;
+ goto fail_unlock;
}
csum:
leaf = path->nodes[0];
@@ -427,6 +428,8 @@ found:
item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
btrfs_item_size_nr(leaf, path->slots[0]));
eb_token = NULL;
+ mutex_unlock(&BTRFS_I(inode)->csum_mutex);
+ cond_resched();
next_sector:
if (!eb_token ||
@@ -467,13 +470,18 @@ next_sector:
eb_token = NULL;
}
btrfs_mark_buffer_dirty(path->nodes[0]);
+ cond_resched();
if (total_bytes < sums->len) {
btrfs_release_path(root, path);
goto again;
}
-fail:
+out:
btrfs_free_path(path);
return ret;
+
+fail_unlock:
+ mutex_unlock(&BTRFS_I(inode)->csum_mutex);
+ goto out;
}
int btrfs_csum_truncate(struct btrfs_trans_handle *trans,