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btrfs: cleanup, use enum values for btrfs_path reada

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Replace the integers by enums for better readability. The value 2 does
not have any meaning since a717531942
"Btrfs: do less aggressive btree readahead" (2009-01-22).

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2015-11-27 16:31:35 +01:00
parent 4d4ab6d6bc
commit e4058b54d1
11 changed files with 30 additions and 30 deletions
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9
fs/btrfs/ctree.c
View File

@ -2248,7 +2248,6 @@ static void reada_for_search(struct btrfs_root *root,
u64 target;
u64 nread = 0;
u64 gen;
int direction = path->reada;
struct extent_buffer *eb;
u32 nr;
u32 blocksize;
@ -2276,16 +2275,16 @@ static void reada_for_search(struct btrfs_root *root,
nr = slot;
while (1) {
if (direction < 0) {
if (path->reada == READA_BACK) {
if (nr == 0)
break;
nr--;
} else if (direction > 0) {
} else if (path->reada == READA_FORWARD) {
nr++;
if (nr >= nritems)
break;
}
if (path->reada < 0 && objectid) {
if (path->reada == READA_BACK && objectid) {
btrfs_node_key(node, &disk_key, nr);
if (btrfs_disk_key_objectid(&disk_key) != objectid)
break;
@ -2493,7 +2492,7 @@ read_block_for_search(struct btrfs_trans_handle *trans,
btrfs_set_path_blocking(p);
free_extent_buffer(tmp);
if (p->reada)
if (p->reada != READA_NONE)
reada_for_search(root, p, level, slot, key->objectid);
btrfs_release_path(p);

1
fs/btrfs/ctree.h
View File

@ -590,6 +590,7 @@ struct btrfs_node {
* The slots array records the index of the item or block pointer
* used while walking the tree.
*/
enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
struct btrfs_path {
struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
int slots[BTRFS_MAX_LEVEL];

12
fs/btrfs/extent-tree.c
View File

@ -438,7 +438,7 @@ static noinline void caching_thread(struct btrfs_work *work)
*/
path->skip_locking = 1;
path->search_commit_root = 1;
path->reada = 1;
path->reada = READA_FORWARD;
key.objectid = last;
key.offset = 0;
@ -2115,7 +2115,7 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
path->reada = 1;
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, fs_info->extent_root, path,
@ -2141,7 +2141,7 @@ static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
path->reada = 1;
path->reada = READA_FORWARD;
path->leave_spinning = 1;
/* now insert the actual backref */
ret = insert_extent_backref(trans, root->fs_info->extent_root,
@ -2254,7 +2254,7 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
}
again:
path->reada = 1;
path->reada = READA_FORWARD;
path->leave_spinning = 1;
ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key,
path, 0, 1);
@ -6438,7 +6438,7 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
if (!path)
return -ENOMEM;
path->reada = 1;
path->reada = READA_FORWARD;
path->leave_spinning = 1;
is_data = owner_objectid >= BTRFS_FIRST_FREE_OBJECTID;
@ -9688,7 +9688,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 1;
path->reada = READA_FORWARD;
cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy);
if (btrfs_test_opt(root, SPACE_CACHE) &&

4
fs/btrfs/file-item.c
View File

@ -202,7 +202,7 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
}
if (bio->bi_iter.bi_size > PAGE_CACHE_SIZE * 8)
path->reada = 2;
path->reada = READA_FORWARD;
WARN_ON(bio->bi_vcnt <= 0);
@ -328,7 +328,7 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
if (search_commit) {
path->skip_locking = 1;
path->reada = 2;
path->reada = READA_FORWARD;
path->search_commit_root = 1;
}

2
fs/btrfs/inode-map.c
View File

@ -48,7 +48,7 @@ static int caching_kthread(void *data)
/* Since the commit root is read-only, we can safely skip locking. */
path->skip_locking = 1;
path->search_commit_root = 1;
path->reada = 2;
path->reada = READA_FORWARD;
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
key.offset = 0;

8
fs/btrfs/inode.c
View File

@ -3342,7 +3342,7 @@ int btrfs_orphan_cleanup(struct btrfs_root *root)
ret = -ENOMEM;
goto out;
}
path->reada = -1;
path->reada = READA_BACK;
key.objectid = BTRFS_ORPHAN_OBJECTID;
key.type = BTRFS_ORPHAN_ITEM_KEY;
@ -4308,7 +4308,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = -1;
path->reada = READA_BACK;
/*
* We want to drop from the next block forward in case this new size is
@ -5744,7 +5744,7 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
if (!path)
return -ENOMEM;
path->reada = 1;
path->reada = READA_FORWARD;
if (key_type == BTRFS_DIR_INDEX_KEY) {
INIT_LIST_HEAD(&ins_list);
@ -6775,7 +6775,7 @@ again:
* Chances are we'll be called again, so go ahead and do
* readahead
*/
path->reada = 1;
path->reada = READA_FORWARD;
}
ret = btrfs_lookup_file_extent(trans, root, path,

2
fs/btrfs/ioctl.c
View File

@ -3478,7 +3478,7 @@ static int btrfs_clone(struct inode *src, struct inode *inode,
return ret;
}
path->reada = 2;
path->reada = READA_FORWARD;
/* clone data */
key.objectid = btrfs_ino(src);
key.type = BTRFS_EXTENT_DATA_KEY;

12
fs/btrfs/relocation.c
View File

@ -708,8 +708,8 @@ struct backref_node *build_backref_tree(struct reloc_control *rc,
err = -ENOMEM;
goto out;
}
path1->reada = 1;
path2->reada = 2;
path1->reada = READA_FORWARD;
path2->reada = READA_FORWARD;
node = alloc_backref_node(cache);
if (!node) {
@ -2130,7 +2130,7 @@ static noinline_for_stack int merge_reloc_root(struct reloc_control *rc,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 1;
path->reada = READA_FORWARD;
reloc_root = root->reloc_root;
root_item = &reloc_root->root_item;
@ -3527,7 +3527,7 @@ static int find_data_references(struct reloc_control *rc,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 1;
path->reada = READA_FORWARD;
root = read_fs_root(rc->extent_root->fs_info, ref_root);
if (IS_ERR(root)) {
@ -3917,7 +3917,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 1;
path->reada = READA_FORWARD;
ret = prepare_to_relocate(rc);
if (ret) {
@ -4343,7 +4343,7 @@ int btrfs_recover_relocation(struct btrfs_root *root)
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = -1;
path->reada = READA_BACK;
key.objectid = BTRFS_TREE_RELOC_OBJECTID;
key.type = BTRFS_ROOT_ITEM_KEY;

2
fs/btrfs/scrub.c
View File

@ -3507,7 +3507,7 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
if (!path)
return -ENOMEM;
path->reada = 2;
path->reada = READA_FORWARD;
path->search_commit_root = 1;
path->skip_locking = 1;

6
fs/btrfs/volumes.c
View File

@ -1102,7 +1102,7 @@ int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 2;
path->reada = READA_FORWARD;
key.objectid = device->devid;
key.offset = start;
@ -1271,7 +1271,7 @@ again:
goto out;
}
path->reada = 2;
path->reada = READA_FORWARD;
path->search_commit_root = 1;
path->skip_locking = 1;
@ -4260,7 +4260,7 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
if (!path)
return -ENOMEM;
path->reada = 2;
path->reada = READA_FORWARD;
lock_chunks(root);

2
fs/btrfs/xattr.c
View File

@ -283,7 +283,7 @@ ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size)
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
path->reada = 2;
path->reada = READA_FORWARD;
/* search for our xattrs */
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);