As btrfs_clear_path_blocking() turns out to be a major source of lock contention, we've kill it and without it btrfs_search_slot() and btrfs_search_old_slot() are not able to return a path in spinning mode, lets kill leave_spinning, too.
Signed-off-by: Liu Bo <bo....@linux.alibaba.com> --- fs/btrfs/backref.c | 3 --- fs/btrfs/ctree.c | 16 +++------------- fs/btrfs/ctree.h | 1 - fs/btrfs/delayed-inode.c | 4 ---- fs/btrfs/dir-item.c | 1 - fs/btrfs/export.c | 1 - fs/btrfs/extent-tree.c | 7 ------- fs/btrfs/extent_io.c | 1 - fs/btrfs/file-item.c | 4 ---- fs/btrfs/free-space-tree.c | 2 -- fs/btrfs/inode-item.c | 6 ------ fs/btrfs/inode.c | 8 -------- fs/btrfs/ioctl.c | 3 --- fs/btrfs/qgroup.c | 2 -- fs/btrfs/super.c | 2 -- fs/btrfs/tests/qgroup-tests.c | 4 ---- 16 files changed, 3 insertions(+), 62 deletions(-) diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index ae750b1574a2..70c629b90710 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -1613,13 +1613,11 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path, s64 bytes_left = ((s64)size) - 1; struct extent_buffer *eb = eb_in; struct btrfs_key found_key; - int leave_spinning = path->leave_spinning; struct btrfs_inode_ref *iref; if (bytes_left >= 0) dest[bytes_left] = '\0'; - path->leave_spinning = 1; while (1) { bytes_left -= name_len; if (bytes_left >= 0) @@ -1665,7 +1663,6 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path, } btrfs_release_path(path); - path->leave_spinning = leave_spinning; if (ret) return ERR_PTR(ret); diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 8b31caa60b0a..d2df7cfbec06 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -2875,14 +2875,10 @@ int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root, } ret = 1; done: - /* - * we don't really know what they plan on doing with the path - * from here on, so for now just mark it as blocking - */ - if (!p->leave_spinning) - btrfs_set_path_blocking(p); if (ret < 0 && !p->skip_release_on_error) btrfs_release_path(p); + + /* path is supposed to be in blocking mode from now on. */ return ret; } @@ -2987,11 +2983,10 @@ int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key, } ret = 1; done: - if (!p->leave_spinning) - btrfs_set_path_blocking(p); if (ret < 0) btrfs_release_path(p); + /* path is supposed to be in blocking mode from now on.*/ return ret; } @@ -5628,7 +5623,6 @@ int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, struct btrfs_key key; u32 nritems; int ret; - int old_spinning = path->leave_spinning; int next_rw_lock = 0; nritems = btrfs_header_nritems(path->nodes[0]); @@ -5643,7 +5637,6 @@ int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, btrfs_release_path(path); path->keep_locks = 1; - path->leave_spinning = 1; if (time_seq) ret = btrfs_search_old_slot(root, &key, path, time_seq); @@ -5780,9 +5773,6 @@ int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, ret = 0; done: unlock_up(path, 0, 1, 0, NULL); - path->leave_spinning = old_spinning; - if (!old_spinning) - btrfs_set_path_blocking(path); return ret; } diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 1aeed3c0e949..e8bddf21b7f7 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -339,7 +339,6 @@ struct btrfs_path { unsigned int search_for_split:1; unsigned int keep_locks:1; unsigned int skip_locking:1; - unsigned int leave_spinning:1; unsigned int search_commit_root:1; unsigned int need_commit_sem:1; unsigned int skip_release_on_error:1; diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c index db9f45082c61..e6fbcdbc313e 100644 --- a/fs/btrfs/delayed-inode.c +++ b/fs/btrfs/delayed-inode.c @@ -1138,7 +1138,6 @@ static int __btrfs_run_delayed_items(struct btrfs_trans_handle *trans, int nr) path = btrfs_alloc_path(); if (!path) return -ENOMEM; - path->leave_spinning = 1; block_rsv = trans->block_rsv; trans->block_rsv = &fs_info->delayed_block_rsv; @@ -1203,7 +1202,6 @@ int btrfs_commit_inode_delayed_items(struct btrfs_trans_handle *trans, btrfs_release_delayed_node(delayed_node); return -ENOMEM; } - path->leave_spinning = 1; block_rsv = trans->block_rsv; trans->block_rsv = &delayed_node->root->fs_info->delayed_block_rsv; @@ -1248,7 +1246,6 @@ int btrfs_commit_inode_delayed_inode(struct btrfs_inode *inode) ret = -ENOMEM; goto trans_out; } - path->leave_spinning = 1; block_rsv = trans->block_rsv; trans->block_rsv = &fs_info->delayed_block_rsv; @@ -1317,7 +1314,6 @@ static void btrfs_async_run_delayed_root(struct btrfs_work *work) if (!delayed_node) break; - path->leave_spinning = 1; root = delayed_node->root; trans = btrfs_join_transaction(root); diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c index a678b07fcf01..4f27d6ba2f1e 100644 --- a/fs/btrfs/dir-item.c +++ b/fs/btrfs/dir-item.c @@ -127,7 +127,6 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root path = btrfs_alloc_path(); if (!path) return -ENOMEM; - path->leave_spinning = 1; btrfs_cpu_key_to_disk(&disk_key, location); diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c index 1f3755b3a37a..7f410edd92e4 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -245,7 +245,6 @@ static int btrfs_get_name(struct dentry *parent, char *name, path = btrfs_alloc_path(); if (!path) return -ENOMEM; - path->leave_spinning = 1; if (ino == BTRFS_FIRST_FREE_OBJECTID) { key.objectid = BTRFS_I(inode)->root->root_key.objectid; diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index de6f75f5547b..8d9ca923db93 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -2116,7 +2116,6 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, return -ENOMEM; path->reada = READA_FORWARD; - path->leave_spinning = 1; /* this will setup the path even if it fails to insert the back ref */ ret = insert_inline_extent_backref(trans, path, bytenr, num_bytes, parent, root_objectid, owner, @@ -2141,7 +2140,6 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, btrfs_release_path(path); path->reada = READA_FORWARD; - path->leave_spinning = 1; /* now insert the actual backref */ ret = insert_extent_backref(trans, path, bytenr, parent, root_objectid, owner, offset, refs_to_add); @@ -2251,7 +2249,6 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans, again: path->reada = READA_FORWARD; - path->leave_spinning = 1; ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 1); if (ret < 0) { err = ret; @@ -6700,7 +6697,6 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans, return -ENOMEM; path->reada = READA_FORWARD; - path->leave_spinning = 1; is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID; BUG_ON(!is_data && refs_to_drop != 1); @@ -6743,7 +6739,6 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans, goto out; } btrfs_release_path(path); - path->leave_spinning = 1; key.objectid = bytenr; key.type = BTRFS_EXTENT_ITEM_KEY; @@ -7896,7 +7891,6 @@ static int alloc_reserved_file_extent(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, ins, size); if (ret) { @@ -7985,7 +7979,6 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, return -ENOMEM; } - path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path, &extent_key, size); if (ret) { diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 628f1aef34b0..481a4bbc49fd 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4444,7 +4444,6 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, path = btrfs_alloc_path(); if (!path) return -ENOMEM; - path->leave_spinning = 1; start = round_down(start, btrfs_inode_sectorsize(inode)); len = round_up(max, btrfs_inode_sectorsize(inode)) - start; diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c index ba74827beb32..8e25953ed901 100644 --- a/fs/btrfs/file-item.c +++ b/fs/btrfs/file-item.c @@ -45,7 +45,6 @@ int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, file_key.offset = pos; file_key.type = BTRFS_EXTENT_DATA_KEY; - path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, root, path, &file_key, sizeof(*item)); if (ret < 0) @@ -598,7 +597,6 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans, key.offset = end_byte - 1; key.type = BTRFS_EXTENT_CSUM_KEY; - path->leave_spinning = 1; ret = btrfs_search_slot(trans, root, &key, path, -1, 1); if (ret > 0) { if (path->slots[0] == 0) @@ -874,10 +872,8 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, } else { ins_size = csum_size; } - path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, root, path, &file_key, ins_size); - path->leave_spinning = 0; if (ret < 0) goto fail_unlock; if (WARN_ON(ret != 0)) diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c index d6736595ec57..bccc33bb453c 100644 --- a/fs/btrfs/free-space-tree.c +++ b/fs/btrfs/free-space-tree.c @@ -1188,8 +1188,6 @@ static int clear_free_space_tree(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; - key.objectid = 0; key.type = 0; key.offset = 0; diff --git a/fs/btrfs/inode-item.c b/fs/btrfs/inode-item.c index a8956a3c9e05..97a7b4de1033 100644 --- a/fs/btrfs/inode-item.c +++ b/fs/btrfs/inode-item.c @@ -129,8 +129,6 @@ static int btrfs_del_inode_extref(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; - ret = btrfs_search_slot(trans, root, &key, path, -1, 1); if (ret > 0) ret = -ENOENT; @@ -203,8 +201,6 @@ int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; - ret = btrfs_search_slot(trans, root, &key, path, -1, 1); if (ret > 0) { ret = -ENOENT; @@ -278,7 +274,6 @@ static int btrfs_insert_inode_extref(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, root, path, &key, ins_len); if (ret == -EEXIST) { @@ -335,7 +330,6 @@ int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; path->skip_release_on_error = 1; ret = btrfs_insert_empty_item(trans, root, path, &key, ins_len); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 9357a19d2bff..8b135a46835f 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -191,7 +191,6 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans, key.type = BTRFS_EXTENT_DATA_KEY; datasize = btrfs_file_extent_calc_inline_size(cur_size); - path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, root, path, &key, datasize); if (ret) @@ -2236,7 +2235,6 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, ins.offset = file_pos; ins.type = BTRFS_EXTENT_DATA_KEY; - path->leave_spinning = 1; ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); if (ret) @@ -2668,7 +2666,6 @@ static noinline int relink_extent_backref(struct btrfs_path *path, key.type = BTRFS_EXTENT_DATA_KEY; key.offset = start; - path->leave_spinning = 1; if (merge) { struct btrfs_file_extent_item *fi; u64 extent_len; @@ -2739,7 +2736,6 @@ static noinline int relink_extent_backref(struct btrfs_path *path, ret = 1; out_free_path: btrfs_release_path(path); - path->leave_spinning = 0; btrfs_end_transaction(trans); out_unlock: unlock_extent_cached(&BTRFS_I(inode)->io_tree, lock_start, lock_end, @@ -3833,7 +3829,6 @@ static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, 1); if (ret) { @@ -3924,7 +3919,6 @@ static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, goto out; } - path->leave_spinning = 1; di = btrfs_lookup_dir_item(trans, root, path, dir_ino, name, name_len, -1); if (IS_ERR(di)) { @@ -4584,7 +4578,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, goto out; } - path->leave_spinning = 1; ret = btrfs_search_slot(trans, root, &key, path, -1, 1); if (ret < 0) goto out; @@ -6300,7 +6293,6 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, goto fail; } - path->leave_spinning = 1; ret = btrfs_insert_empty_items(trans, root, path, key, sizes, nitems); if (ret != 0) goto fail_unlock; diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index d3a5d2a41e5f..1de051f529f9 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -3899,7 +3899,6 @@ static int btrfs_clone(struct inode *src, struct inode *inode, * note the key will change type as we walk through the * tree. */ - path->leave_spinning = 1; ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path, 0, 0); if (ret < 0) @@ -3981,7 +3980,6 @@ static int btrfs_clone(struct inode *src, struct inode *inode, size); btrfs_release_path(path); - path->leave_spinning = 0; memcpy(&new_key, &key, sizeof(new_key)); new_key.objectid = btrfs_ino(BTRFS_I(inode)); @@ -4371,7 +4369,6 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) ret = -ENOMEM; goto out; } - path->leave_spinning = 1; trans = btrfs_start_transaction(root, 1); if (IS_ERR(trans)) { diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c index 4353bb69bb86..58e859593bbb 100644 --- a/fs/btrfs/qgroup.c +++ b/fs/btrfs/qgroup.c @@ -844,8 +844,6 @@ static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans, if (!path) return -ENOMEM; - path->leave_spinning = 1; - key.objectid = 0; key.offset = 0; key.type = 0; diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 6601c9aa5e35..4aa0b4f61ffd 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -1015,7 +1015,6 @@ static char *get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, ret = -ENOMEM; goto err; } - path->leave_spinning = 1; name = kmalloc(PATH_MAX, GFP_KERNEL); if (!name) { @@ -1143,7 +1142,6 @@ static int get_default_subvol_objectid(struct btrfs_fs_info *fs_info, u64 *objec path = btrfs_alloc_path(); if (!path) return -ENOMEM; - path->leave_spinning = 1; /* * Find the "default" dir item which points to the root item that we diff --git a/fs/btrfs/tests/qgroup-tests.c b/fs/btrfs/tests/qgroup-tests.c index 412b910b04cc..91233a0d4d62 100644 --- a/fs/btrfs/tests/qgroup-tests.c +++ b/fs/btrfs/tests/qgroup-tests.c @@ -36,7 +36,6 @@ static int insert_normal_tree_ref(struct btrfs_root *root, u64 bytenr, return -ENOMEM; } - path->leave_spinning = 1; ret = btrfs_insert_empty_item(&trans, root, path, &ins, size); if (ret) { test_err("couldn't insert ref %d", ret); @@ -86,7 +85,6 @@ static int add_tree_ref(struct btrfs_root *root, u64 bytenr, u64 num_bytes, return -ENOMEM; } - path->leave_spinning = 1; ret = btrfs_search_slot(&trans, root, &key, path, 0, 1); if (ret) { test_err("couldn't find extent ref"); @@ -135,7 +133,6 @@ static int remove_extent_item(struct btrfs_root *root, u64 bytenr, test_err("couldn't allocate path"); return -ENOMEM; } - path->leave_spinning = 1; ret = btrfs_search_slot(&trans, root, &key, path, -1, 1); if (ret) { @@ -170,7 +167,6 @@ static int remove_extent_ref(struct btrfs_root *root, u64 bytenr, return -ENOMEM; } - path->leave_spinning = 1; ret = btrfs_search_slot(&trans, root, &key, path, 0, 1); if (ret) { test_err("couldn't find extent ref"); -- 1.8.3.1