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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-11 22:37:59 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-20 10:05:47 +0900
commit30db4e6c3d51a89e4923e525303f714e6508bbd0 (patch)
treec1c83cff8e73b2534a391f2c89926b3badfdaa83 /fs/nilfs2
parenta49762fd119d191dcbb2f638a2dbc2ed53f4e2bb (diff)
nilfs2: remove buffer locking from btree code
lock_buffer() and unlock_buffer() uses in btree.c are eliminable because btree functions gain buffer heads through nilfs_btnode_get(), which never returns an on-the-fly buffer. Although nilfs_clear_dirty_page() and nilfs_copy_back_pages() in nilfs_commit_gcdat_inode() juggle btree node buffers of DAT, this is safe because these operations are protected by a log writer lock or the metadata file semaphore of DAT. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2')
-rw-r--r--fs/nilfs2/btree.c60
1 files changed, 0 insertions, 60 deletions
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index 420c9ecbca1..c9aab29ea1f 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -652,13 +652,11 @@ static void nilfs_btree_promote_key(struct nilfs_btree *btree,
{
if (level < nilfs_btree_height(btree) - 1) {
do {
- lock_buffer(path[level].bp_bh);
nilfs_btree_node_set_key(
nilfs_btree_get_nonroot_node(path, level),
path[level].bp_index, key);
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
} while ((path[level].bp_index == 0) &&
(++level < nilfs_btree_height(btree) - 1));
}
@@ -677,13 +675,11 @@ static void nilfs_btree_do_insert(struct nilfs_btree *btree,
struct nilfs_btree_node *node;
if (level < nilfs_btree_height(btree) - 1) {
- lock_buffer(path[level].bp_bh);
node = nilfs_btree_get_nonroot_node(path, level);
nilfs_btree_node_insert(btree, node, *keyp, *ptrp,
path[level].bp_index);
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
if (path[level].bp_index == 0)
nilfs_btree_promote_key(btree, path, level + 1,
@@ -703,9 +699,6 @@ static void nilfs_btree_carry_left(struct nilfs_btree *btree,
struct nilfs_btree_node *node, *left;
int nchildren, lnchildren, n, move;
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
left = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -726,9 +719,6 @@ static void nilfs_btree_carry_left(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(node, 0));
@@ -754,9 +744,6 @@ static void nilfs_btree_carry_right(struct nilfs_btree *btree,
struct nilfs_btree_node *node, *right;
int nchildren, rnchildren, n, move;
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -777,9 +764,6 @@ static void nilfs_btree_carry_right(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
path[level + 1].bp_index++;
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(right, 0));
@@ -808,9 +792,6 @@ static void nilfs_btree_split(struct nilfs_btree *btree,
__u64 newptr;
int nchildren, n, move;
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -829,9 +810,6 @@ static void nilfs_btree_split(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
newkey = nilfs_btree_node_get_key(right, 0);
newptr = path[level].bp_newreq.bpr_ptr;
@@ -866,8 +844,6 @@ static void nilfs_btree_grow(struct nilfs_btree *btree,
struct nilfs_btree_node *root, *child;
int n;
- lock_buffer(path[level].bp_sib_bh);
-
root = nilfs_btree_get_root(btree);
child = nilfs_btree_get_sib_node(path, level);
@@ -879,8 +855,6 @@ static void nilfs_btree_grow(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
path[level].bp_bh = path[level].bp_sib_bh;
path[level].bp_sib_bh = NULL;
@@ -1037,11 +1011,9 @@ static int nilfs_btree_prepare_insert(struct nilfs_btree *btree,
stats->bs_nblocks++;
- lock_buffer(bh);
nilfs_btree_node_init(btree,
(struct nilfs_btree_node *)bh->b_data,
0, level, 0, NULL, NULL);
- unlock_buffer(bh);
path[level].bp_sib_bh = bh;
path[level].bp_op = nilfs_btree_split;
}
@@ -1066,10 +1038,8 @@ static int nilfs_btree_prepare_insert(struct nilfs_btree *btree,
if (ret < 0)
goto err_out_curr_node;
- lock_buffer(bh);
nilfs_btree_node_init(btree, (struct nilfs_btree_node *)bh->b_data,
0, level, 0, NULL, NULL);
- unlock_buffer(bh);
path[level].bp_sib_bh = bh;
path[level].bp_op = nilfs_btree_grow;
@@ -1168,13 +1138,11 @@ static void nilfs_btree_do_delete(struct nilfs_btree *btree,
struct nilfs_btree_node *node;
if (level < nilfs_btree_height(btree) - 1) {
- lock_buffer(path[level].bp_bh);
node = nilfs_btree_get_nonroot_node(path, level);
nilfs_btree_node_delete(btree, node, keyp, ptrp,
path[level].bp_index);
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
if (path[level].bp_index == 0)
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(node, 0));
@@ -1194,9 +1162,6 @@ static void nilfs_btree_borrow_left(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
left = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -1211,9 +1176,6 @@ static void nilfs_btree_borrow_left(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(node, 0));
@@ -1231,9 +1193,6 @@ static void nilfs_btree_borrow_right(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
nchildren = nilfs_btree_node_get_nchildren(node);
@@ -1248,9 +1207,6 @@ static void nilfs_btree_borrow_right(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
path[level + 1].bp_index++;
nilfs_btree_promote_key(btree, path, level + 1,
nilfs_btree_node_get_key(right, 0));
@@ -1269,9 +1225,6 @@ static void nilfs_btree_concat_left(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
left = nilfs_btree_get_sib_node(path, level);
@@ -1282,9 +1235,6 @@ static void nilfs_btree_concat_left(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_sib_bh))
nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btnode_delete(path[level].bp_bh);
path[level].bp_bh = path[level].bp_sib_bh;
path[level].bp_sib_bh = NULL;
@@ -1300,9 +1250,6 @@ static void nilfs_btree_concat_right(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
- lock_buffer(path[level].bp_sib_bh);
-
node = nilfs_btree_get_nonroot_node(path, level);
right = nilfs_btree_get_sib_node(path, level);
@@ -1313,9 +1260,6 @@ static void nilfs_btree_concat_right(struct nilfs_btree *btree,
if (!buffer_dirty(path[level].bp_bh))
nilfs_btnode_mark_dirty(path[level].bp_bh);
- unlock_buffer(path[level].bp_bh);
- unlock_buffer(path[level].bp_sib_bh);
-
nilfs_btnode_delete(path[level].bp_sib_bh);
path[level].bp_sib_bh = NULL;
path[level + 1].bp_index++;
@@ -1330,7 +1274,6 @@ static void nilfs_btree_shrink(struct nilfs_btree *btree,
nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
- lock_buffer(path[level].bp_bh);
root = nilfs_btree_get_root(btree);
child = nilfs_btree_get_nonroot_node(path, level);
@@ -1338,7 +1281,6 @@ static void nilfs_btree_shrink(struct nilfs_btree *btree,
nilfs_btree_node_set_level(root, level);
n = nilfs_btree_node_get_nchildren(child);
nilfs_btree_node_move_left(btree, root, child, n);
- unlock_buffer(path[level].bp_bh);
nilfs_btnode_delete(path[level].bp_bh);
path[level].bp_bh = NULL;
@@ -1713,7 +1655,6 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,
nilfs_bmap_commit_alloc_ptr(bmap, nreq, dat);
/* create child node at level 1 */
- lock_buffer(bh);
node = (struct nilfs_btree_node *)bh->b_data;
nilfs_btree_node_init(btree, node, 0, 1, n, keys, ptrs);
nilfs_btree_node_insert(btree, node,
@@ -1723,7 +1664,6 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,
if (!nilfs_bmap_dirty(bmap))
nilfs_bmap_set_dirty(bmap);
- unlock_buffer(bh);
brelse(bh);
/* create root node at level 2 */