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>
This commit is contained in:
Ryusuke Konishi
Родитель
a49762fd11
Коммит
30db4e6c3d
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@ -652,13 +652,11 @@ static void nilfs_btree_promote_key(struct nilfs_btree *btree,
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{
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if (level < nilfs_btree_height(btree) - 1) {
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do {
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lock_buffer(path[level].bp_bh);
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nilfs_btree_node_set_key(
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nilfs_btree_get_nonroot_node(path, level),
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path[level].bp_index, key);
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if (!buffer_dirty(path[level].bp_bh))
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nilfs_btnode_mark_dirty(path[level].bp_bh);
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unlock_buffer(path[level].bp_bh);
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} while ((path[level].bp_index == 0) &&
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(++level < nilfs_btree_height(btree) - 1));
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}
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@ -677,13 +675,11 @@ static void nilfs_btree_do_insert(struct nilfs_btree *btree,
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struct nilfs_btree_node *node;
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if (level < nilfs_btree_height(btree) - 1) {
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lock_buffer(path[level].bp_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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nilfs_btree_node_insert(btree, node, *keyp, *ptrp,
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path[level].bp_index);
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if (!buffer_dirty(path[level].bp_bh))
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nilfs_btnode_mark_dirty(path[level].bp_bh);
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unlock_buffer(path[level].bp_bh);
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if (path[level].bp_index == 0)
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nilfs_btree_promote_key(btree, path, level + 1,
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@ -703,9 +699,6 @@ static void nilfs_btree_carry_left(struct nilfs_btree *btree,
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struct nilfs_btree_node *node, *left;
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int nchildren, lnchildren, n, move;
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lock_buffer(path[level].bp_bh);
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lock_buffer(path[level].bp_sib_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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left = nilfs_btree_get_sib_node(path, level);
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nchildren = nilfs_btree_node_get_nchildren(node);
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@ -726,9 +719,6 @@ static void nilfs_btree_carry_left(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_sib_bh))
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nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
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unlock_buffer(path[level].bp_bh);
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unlock_buffer(path[level].bp_sib_bh);
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nilfs_btree_promote_key(btree, path, level + 1,
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nilfs_btree_node_get_key(node, 0));
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@ -754,9 +744,6 @@ static void nilfs_btree_carry_right(struct nilfs_btree *btree,
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struct nilfs_btree_node *node, *right;
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int nchildren, rnchildren, n, move;
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lock_buffer(path[level].bp_bh);
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lock_buffer(path[level].bp_sib_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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right = nilfs_btree_get_sib_node(path, level);
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nchildren = nilfs_btree_node_get_nchildren(node);
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@ -777,9 +764,6 @@ static void nilfs_btree_carry_right(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_sib_bh))
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nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
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unlock_buffer(path[level].bp_bh);
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unlock_buffer(path[level].bp_sib_bh);
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path[level + 1].bp_index++;
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nilfs_btree_promote_key(btree, path, level + 1,
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nilfs_btree_node_get_key(right, 0));
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@ -808,9 +792,6 @@ static void nilfs_btree_split(struct nilfs_btree *btree,
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__u64 newptr;
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int nchildren, n, move;
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lock_buffer(path[level].bp_bh);
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lock_buffer(path[level].bp_sib_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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right = nilfs_btree_get_sib_node(path, level);
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nchildren = nilfs_btree_node_get_nchildren(node);
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@ -829,9 +810,6 @@ static void nilfs_btree_split(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_sib_bh))
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nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
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unlock_buffer(path[level].bp_bh);
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unlock_buffer(path[level].bp_sib_bh);
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newkey = nilfs_btree_node_get_key(right, 0);
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newptr = path[level].bp_newreq.bpr_ptr;
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@ -866,8 +844,6 @@ static void nilfs_btree_grow(struct nilfs_btree *btree,
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struct nilfs_btree_node *root, *child;
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int n;
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lock_buffer(path[level].bp_sib_bh);
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root = nilfs_btree_get_root(btree);
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child = nilfs_btree_get_sib_node(path, level);
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@ -879,8 +855,6 @@ static void nilfs_btree_grow(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_sib_bh))
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nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
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unlock_buffer(path[level].bp_sib_bh);
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path[level].bp_bh = path[level].bp_sib_bh;
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path[level].bp_sib_bh = NULL;
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@ -1037,11 +1011,9 @@ static int nilfs_btree_prepare_insert(struct nilfs_btree *btree,
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stats->bs_nblocks++;
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lock_buffer(bh);
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nilfs_btree_node_init(btree,
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(struct nilfs_btree_node *)bh->b_data,
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0, level, 0, NULL, NULL);
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unlock_buffer(bh);
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path[level].bp_sib_bh = bh;
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path[level].bp_op = nilfs_btree_split;
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}
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@ -1066,10 +1038,8 @@ static int nilfs_btree_prepare_insert(struct nilfs_btree *btree,
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if (ret < 0)
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goto err_out_curr_node;
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lock_buffer(bh);
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nilfs_btree_node_init(btree, (struct nilfs_btree_node *)bh->b_data,
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0, level, 0, NULL, NULL);
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unlock_buffer(bh);
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path[level].bp_sib_bh = bh;
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path[level].bp_op = nilfs_btree_grow;
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@ -1168,13 +1138,11 @@ static void nilfs_btree_do_delete(struct nilfs_btree *btree,
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struct nilfs_btree_node *node;
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if (level < nilfs_btree_height(btree) - 1) {
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lock_buffer(path[level].bp_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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nilfs_btree_node_delete(btree, node, keyp, ptrp,
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path[level].bp_index);
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if (!buffer_dirty(path[level].bp_bh))
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nilfs_btnode_mark_dirty(path[level].bp_bh);
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unlock_buffer(path[level].bp_bh);
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if (path[level].bp_index == 0)
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nilfs_btree_promote_key(btree, path, level + 1,
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nilfs_btree_node_get_key(node, 0));
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@ -1194,9 +1162,6 @@ static void nilfs_btree_borrow_left(struct nilfs_btree *btree,
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nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
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lock_buffer(path[level].bp_bh);
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lock_buffer(path[level].bp_sib_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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left = nilfs_btree_get_sib_node(path, level);
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nchildren = nilfs_btree_node_get_nchildren(node);
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@ -1211,9 +1176,6 @@ static void nilfs_btree_borrow_left(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_sib_bh))
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nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
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unlock_buffer(path[level].bp_bh);
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unlock_buffer(path[level].bp_sib_bh);
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nilfs_btree_promote_key(btree, path, level + 1,
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nilfs_btree_node_get_key(node, 0));
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@ -1231,9 +1193,6 @@ static void nilfs_btree_borrow_right(struct nilfs_btree *btree,
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nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
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lock_buffer(path[level].bp_bh);
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lock_buffer(path[level].bp_sib_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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right = nilfs_btree_get_sib_node(path, level);
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nchildren = nilfs_btree_node_get_nchildren(node);
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@ -1248,9 +1207,6 @@ static void nilfs_btree_borrow_right(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_sib_bh))
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nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
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unlock_buffer(path[level].bp_bh);
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unlock_buffer(path[level].bp_sib_bh);
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path[level + 1].bp_index++;
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nilfs_btree_promote_key(btree, path, level + 1,
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nilfs_btree_node_get_key(right, 0));
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@ -1269,9 +1225,6 @@ static void nilfs_btree_concat_left(struct nilfs_btree *btree,
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nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
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lock_buffer(path[level].bp_bh);
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lock_buffer(path[level].bp_sib_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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left = nilfs_btree_get_sib_node(path, level);
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@ -1282,9 +1235,6 @@ static void nilfs_btree_concat_left(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_sib_bh))
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nilfs_btnode_mark_dirty(path[level].bp_sib_bh);
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unlock_buffer(path[level].bp_bh);
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unlock_buffer(path[level].bp_sib_bh);
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nilfs_btnode_delete(path[level].bp_bh);
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path[level].bp_bh = path[level].bp_sib_bh;
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path[level].bp_sib_bh = NULL;
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@ -1300,9 +1250,6 @@ static void nilfs_btree_concat_right(struct nilfs_btree *btree,
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nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
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lock_buffer(path[level].bp_bh);
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lock_buffer(path[level].bp_sib_bh);
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node = nilfs_btree_get_nonroot_node(path, level);
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right = nilfs_btree_get_sib_node(path, level);
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@ -1313,9 +1260,6 @@ static void nilfs_btree_concat_right(struct nilfs_btree *btree,
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if (!buffer_dirty(path[level].bp_bh))
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nilfs_btnode_mark_dirty(path[level].bp_bh);
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unlock_buffer(path[level].bp_bh);
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unlock_buffer(path[level].bp_sib_bh);
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nilfs_btnode_delete(path[level].bp_sib_bh);
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path[level].bp_sib_bh = NULL;
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path[level + 1].bp_index++;
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@ -1330,7 +1274,6 @@ static void nilfs_btree_shrink(struct nilfs_btree *btree,
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nilfs_btree_do_delete(btree, path, level, keyp, ptrp);
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lock_buffer(path[level].bp_bh);
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root = nilfs_btree_get_root(btree);
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child = nilfs_btree_get_nonroot_node(path, level);
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@ -1338,7 +1281,6 @@ static void nilfs_btree_shrink(struct nilfs_btree *btree,
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nilfs_btree_node_set_level(root, level);
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n = nilfs_btree_node_get_nchildren(child);
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nilfs_btree_node_move_left(btree, root, child, n);
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unlock_buffer(path[level].bp_bh);
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nilfs_btnode_delete(path[level].bp_bh);
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path[level].bp_bh = NULL;
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@ -1713,7 +1655,6 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,
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nilfs_bmap_commit_alloc_ptr(bmap, nreq, dat);
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/* create child node at level 1 */
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lock_buffer(bh);
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node = (struct nilfs_btree_node *)bh->b_data;
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nilfs_btree_node_init(btree, node, 0, 1, n, keys, ptrs);
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nilfs_btree_node_insert(btree, node,
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@ -1723,7 +1664,6 @@ nilfs_btree_commit_convert_and_insert(struct nilfs_bmap *bmap,
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if (!nilfs_bmap_dirty(bmap))
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nilfs_bmap_set_dirty(bmap);
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unlock_buffer(bh);
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brelse(bh);
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/* create root node at level 2 */
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