From: Jeff Mahoney Date: Thu, 29 Jun 2017 03:56:57 +0000 (-0600) Subject: btrfs: backref, cleanup __ namespace abuse X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e0c476b128e37daa37d630dd68da5681e9c16bab;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git btrfs: backref, cleanup __ namespace abuse We typically use __ to indicate a helper routine that shouldn't be called directly without understanding the proper context required to do so. We use static functions to indicate that a function is private to a particular C file. The backref code uses static function and __ prefixes on nearly everything, which makes the code difficult to read and establishes a pattern for future code that shouldn't be followed. This patch drops all the unnecessary prefixes. Signed-off-by: Jeff Mahoney Signed-off-by: David Sterba --- diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 4a7a4b032c2f..3725277f6e08 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -387,7 +387,7 @@ static int find_extent_in_eb(const struct extent_buffer *eb, /* * this structure records all encountered refs on the way up to the root */ -struct __prelim_ref { +struct prelim_ref { struct list_head list; u64 root_id; struct btrfs_key key_for_search; @@ -403,7 +403,7 @@ static struct kmem_cache *btrfs_prelim_ref_cache; int __init btrfs_prelim_ref_init(void) { btrfs_prelim_ref_cache = kmem_cache_create("btrfs_prelim_ref", - sizeof(struct __prelim_ref), + sizeof(struct prelim_ref), 0, SLAB_MEM_SPREAD, NULL); @@ -449,19 +449,17 @@ void btrfs_prelim_ref_exit(void) * * - column 1, 3: we've the parent -> done * - column 2: we take the first key from the block to find the parent - * (see __add_missing_keys) + * (see add_missing_keys) * - column 4: we use the key to find the parent * * additional information that's available but not required to find the parent * block might help in merging entries to gain some speed. */ - -static int __add_prelim_ref(struct list_head *head, u64 root_id, - const struct btrfs_key *key, int level, - u64 parent, u64 wanted_disk_byte, int count, - gfp_t gfp_mask) +static int add_prelim_ref(struct list_head *head, u64 root_id, + const struct btrfs_key *key, int level, u64 parent, + u64 wanted_disk_byte, int count, gfp_t gfp_mask) { - struct __prelim_ref *ref; + struct prelim_ref *ref; if (root_id == BTRFS_DATA_RELOC_TREE_OBJECTID) return 0; @@ -510,7 +508,7 @@ static int __add_prelim_ref(struct list_head *head, u64 root_id, } static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path, - struct ulist *parents, struct __prelim_ref *ref, + struct ulist *parents, struct prelim_ref *ref, int level, u64 time_seq, const u64 *extent_item_pos, u64 total_refs) { @@ -600,11 +598,10 @@ next: * resolve an indirect backref in the form (root_id, key, level) * to a logical address */ -static int __resolve_indirect_ref(struct btrfs_fs_info *fs_info, - struct btrfs_path *path, u64 time_seq, - struct __prelim_ref *ref, - struct ulist *parents, - const u64 *extent_item_pos, u64 total_refs) +static int resolve_indirect_ref(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, u64 time_seq, + struct prelim_ref *ref, struct ulist *parents, + const u64 *extent_item_pos, u64 total_refs) { struct btrfs_root *root; struct btrfs_key root_key; @@ -693,17 +690,17 @@ unode_aux_to_inode_list(struct ulist_node *node) /* * resolve all indirect backrefs from the list */ -static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info, - struct btrfs_path *path, u64 time_seq, - struct list_head *head, - const u64 *extent_item_pos, u64 total_refs, - u64 root_objectid) +static int resolve_indirect_refs(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, u64 time_seq, + struct list_head *head, + const u64 *extent_item_pos, u64 total_refs, + u64 root_objectid) { int err; int ret = 0; - struct __prelim_ref *ref; - struct __prelim_ref *ref_safe; - struct __prelim_ref *new_ref; + struct prelim_ref *ref; + struct prelim_ref *ref_safe; + struct prelim_ref *new_ref; struct ulist *parents; struct ulist_node *node; struct ulist_iterator uiter; @@ -726,9 +723,9 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info, ret = BACKREF_FOUND_SHARED; goto out; } - err = __resolve_indirect_ref(fs_info, path, time_seq, ref, - parents, extent_item_pos, - total_refs); + err = resolve_indirect_ref(fs_info, path, time_seq, ref, + parents, extent_item_pos, + total_refs); /* * we can only tolerate ENOENT,otherwise,we should catch error * and return directly. @@ -766,8 +763,8 @@ out: return ret; } -static inline int ref_for_same_block(struct __prelim_ref *ref1, - struct __prelim_ref *ref2) +static inline int ref_for_same_block(struct prelim_ref *ref1, + struct prelim_ref *ref2) { if (ref1->level != ref2->level) return 0; @@ -788,10 +785,10 @@ static inline int ref_for_same_block(struct __prelim_ref *ref1, /* * read tree blocks and add keys where required. */ -static int __add_missing_keys(struct btrfs_fs_info *fs_info, - struct list_head *head) +static int add_missing_keys(struct btrfs_fs_info *fs_info, + struct list_head *head) { - struct __prelim_ref *ref; + struct prelim_ref *ref; struct extent_buffer *eb; list_for_each_entry(ref, head, list) { @@ -821,20 +818,20 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info, /* * merge backrefs and adjust counts accordingly * - * FIXME: For MERGE_IDENTICAL_KEYS, if we add more keys in __add_prelim_ref + * FIXME: For MERGE_IDENTICAL_KEYS, if we add more keys in add_prelim_ref * then we can merge more here. Additionally, we could even add a key * range for the blocks we looked into to merge even more (-> replace * unresolved refs by those having a parent). */ -static void __merge_refs(struct list_head *head, enum merge_mode mode) +static void merge_refs(struct list_head *head, enum merge_mode mode) { - struct __prelim_ref *pos1; + struct prelim_ref *pos1; list_for_each_entry(pos1, head, list) { - struct __prelim_ref *pos2 = pos1, *tmp; + struct prelim_ref *pos2 = pos1, *tmp; list_for_each_entry_safe_continue(pos2, tmp, head, list) { - struct __prelim_ref *ref1 = pos1, *ref2 = pos2; + struct prelim_ref *ref1 = pos1, *ref2 = pos2; struct extent_inode_elem *eie; if (!ref_for_same_block(ref1, ref2)) @@ -868,9 +865,9 @@ static void __merge_refs(struct list_head *head, enum merge_mode mode) * add all currently queued delayed refs from this head whose seq nr is * smaller or equal that seq to the list */ -static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq, - struct list_head *prefs, u64 *total_refs, - u64 inum) +static int add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq, + struct list_head *prefs, u64 *total_refs, + u64 inum) { struct btrfs_delayed_ref_node *node; struct btrfs_delayed_extent_op *extent_op = head->extent_op; @@ -907,19 +904,18 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq, struct btrfs_delayed_tree_ref *ref; ref = btrfs_delayed_node_to_tree_ref(node); - ret = __add_prelim_ref(prefs, ref->root, &op_key, - ref->level + 1, 0, node->bytenr, - node->ref_mod * sgn, GFP_ATOMIC); + ret = add_prelim_ref(prefs, ref->root, &op_key, + ref->level + 1, 0, node->bytenr, + node->ref_mod * sgn, GFP_ATOMIC); break; } case BTRFS_SHARED_BLOCK_REF_KEY: { struct btrfs_delayed_tree_ref *ref; ref = btrfs_delayed_node_to_tree_ref(node); - ret = __add_prelim_ref(prefs, 0, NULL, - ref->level + 1, ref->parent, - node->bytenr, - node->ref_mod * sgn, GFP_ATOMIC); + ret = add_prelim_ref(prefs, 0, NULL, ref->level + 1, + ref->parent, node->bytenr, + node->ref_mod * sgn, GFP_ATOMIC); break; } case BTRFS_EXTENT_DATA_REF_KEY: { @@ -939,18 +935,18 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq, break; } - ret = __add_prelim_ref(prefs, ref->root, &key, 0, 0, - node->bytenr, - node->ref_mod * sgn, GFP_ATOMIC); + ret = add_prelim_ref(prefs, ref->root, &key, 0, 0, + node->bytenr, node->ref_mod * sgn, + GFP_ATOMIC); break; } case BTRFS_SHARED_DATA_REF_KEY: { struct btrfs_delayed_data_ref *ref; ref = btrfs_delayed_node_to_data_ref(node); - ret = __add_prelim_ref(prefs, 0, NULL, 0, - ref->parent, node->bytenr, - node->ref_mod * sgn, GFP_ATOMIC); + ret = add_prelim_ref(prefs, 0, NULL, 0, ref->parent, + node->bytenr, node->ref_mod * sgn, + GFP_ATOMIC); break; } default: @@ -966,10 +962,10 @@ static int __add_delayed_refs(struct btrfs_delayed_ref_head *head, u64 seq, /* * add all inline backrefs for bytenr to the list */ -static int __add_inline_refs(struct btrfs_path *path, u64 bytenr, - int *info_level, struct list_head *prefs, - struct ref_root *ref_tree, - u64 *total_refs, u64 inum) +static int add_inline_refs(struct btrfs_path *path, u64 bytenr, + int *info_level, struct list_head *prefs, + struct ref_root *ref_tree, + u64 *total_refs, u64 inum) { int ret = 0; int slot; @@ -1024,9 +1020,8 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr, switch (type) { case BTRFS_SHARED_BLOCK_REF_KEY: - ret = __add_prelim_ref(prefs, 0, NULL, - *info_level + 1, offset, - bytenr, 1, GFP_NOFS); + ret = add_prelim_ref(prefs, 0, NULL, *info_level + 1, + offset, bytenr, 1, GFP_NOFS); break; case BTRFS_SHARED_DATA_REF_KEY: { struct btrfs_shared_data_ref *sdref; @@ -1034,8 +1029,8 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr, sdref = (struct btrfs_shared_data_ref *)(iref + 1); count = btrfs_shared_data_ref_count(leaf, sdref); - ret = __add_prelim_ref(prefs, 0, NULL, 0, offset, - bytenr, count, GFP_NOFS); + ret = add_prelim_ref(prefs, 0, NULL, 0, offset, + bytenr, count, GFP_NOFS); if (ref_tree) { if (!ret) ret = ref_tree_add(ref_tree, 0, 0, 0, @@ -1046,9 +1041,9 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr, break; } case BTRFS_TREE_BLOCK_REF_KEY: - ret = __add_prelim_ref(prefs, offset, NULL, - *info_level + 1, 0, - bytenr, 1, GFP_NOFS); + ret = add_prelim_ref(prefs, offset, NULL, + *info_level + 1, 0, + bytenr, 1, GFP_NOFS); break; case BTRFS_EXTENT_DATA_REF_KEY: { struct btrfs_extent_data_ref *dref; @@ -1068,8 +1063,8 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr, } root = btrfs_extent_data_ref_root(leaf, dref); - ret = __add_prelim_ref(prefs, root, &key, 0, 0, - bytenr, count, GFP_NOFS); + ret = add_prelim_ref(prefs, root, &key, 0, 0, + bytenr, count, GFP_NOFS); if (ref_tree) { if (!ret) ret = ref_tree_add(ref_tree, root, @@ -1095,10 +1090,10 @@ static int __add_inline_refs(struct btrfs_path *path, u64 bytenr, /* * add all non-inline backrefs for bytenr to the list */ -static int __add_keyed_refs(struct btrfs_fs_info *fs_info, - struct btrfs_path *path, u64 bytenr, - int info_level, struct list_head *prefs, - struct ref_root *ref_tree, u64 inum) +static int add_keyed_refs(struct btrfs_fs_info *fs_info, + struct btrfs_path *path, u64 bytenr, + int info_level, struct list_head *prefs, + struct ref_root *ref_tree, u64 inum) { struct btrfs_root *extent_root = fs_info->extent_root; int ret; @@ -1128,9 +1123,8 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info, switch (key.type) { case BTRFS_SHARED_BLOCK_REF_KEY: - ret = __add_prelim_ref(prefs, 0, NULL, - info_level + 1, key.offset, - bytenr, 1, GFP_NOFS); + ret = add_prelim_ref(prefs, 0, NULL, info_level + 1, + key.offset, bytenr, 1, GFP_NOFS); break; case BTRFS_SHARED_DATA_REF_KEY: { struct btrfs_shared_data_ref *sdref; @@ -1139,8 +1133,8 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info, sdref = btrfs_item_ptr(leaf, slot, struct btrfs_shared_data_ref); count = btrfs_shared_data_ref_count(leaf, sdref); - ret = __add_prelim_ref(prefs, 0, NULL, 0, key.offset, - bytenr, count, GFP_NOFS); + ret = add_prelim_ref(prefs, 0, NULL, 0, key.offset, + bytenr, count, GFP_NOFS); if (ref_tree) { if (!ret) ret = ref_tree_add(ref_tree, 0, 0, 0, @@ -1151,9 +1145,9 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info, break; } case BTRFS_TREE_BLOCK_REF_KEY: - ret = __add_prelim_ref(prefs, key.offset, NULL, - info_level + 1, 0, - bytenr, 1, GFP_NOFS); + ret = add_prelim_ref(prefs, key.offset, NULL, + info_level + 1, 0, + bytenr, 1, GFP_NOFS); break; case BTRFS_EXTENT_DATA_REF_KEY: { struct btrfs_extent_data_ref *dref; @@ -1174,8 +1168,8 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info, } root = btrfs_extent_data_ref_root(leaf, dref); - ret = __add_prelim_ref(prefs, root, &key, 0, 0, - bytenr, count, GFP_NOFS); + ret = add_prelim_ref(prefs, root, &key, 0, 0, + bytenr, count, GFP_NOFS); if (ref_tree) { if (!ret) ret = ref_tree_add(ref_tree, root, @@ -1230,7 +1224,7 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans, int ret; struct list_head prefs_delayed; struct list_head prefs; - struct __prelim_ref *ref; + struct prelim_ref *ref; struct extent_inode_elem *eie = NULL; struct ref_root *ref_tree = NULL; u64 total_refs = 0; @@ -1311,9 +1305,9 @@ again: goto again; } spin_unlock(&delayed_refs->lock); - ret = __add_delayed_refs(head, time_seq, - &prefs_delayed, &total_refs, - inum); + ret = add_delayed_refs(head, time_seq, + &prefs_delayed, &total_refs, + inum); mutex_unlock(&head->mutex); if (ret) goto out; @@ -1363,15 +1357,13 @@ again: if (key.objectid == bytenr && (key.type == BTRFS_EXTENT_ITEM_KEY || key.type == BTRFS_METADATA_ITEM_KEY)) { - ret = __add_inline_refs(path, bytenr, - &info_level, &prefs, - ref_tree, &total_refs, - inum); + ret = add_inline_refs(path, bytenr, &info_level, + &prefs, ref_tree, &total_refs, + inum); if (ret) goto out; - ret = __add_keyed_refs(fs_info, path, bytenr, - info_level, &prefs, - ref_tree, inum); + ret = add_keyed_refs(fs_info, path, bytenr, info_level, + &prefs, ref_tree, inum); if (ret) goto out; } @@ -1380,22 +1372,22 @@ again: list_splice_init(&prefs_delayed, &prefs); - ret = __add_missing_keys(fs_info, &prefs); + ret = add_missing_keys(fs_info, &prefs); if (ret) goto out; - __merge_refs(&prefs, MERGE_IDENTICAL_KEYS); + merge_refs(&prefs, MERGE_IDENTICAL_KEYS); - ret = __resolve_indirect_refs(fs_info, path, time_seq, &prefs, - extent_item_pos, total_refs, - root_objectid); + ret = resolve_indirect_refs(fs_info, path, time_seq, &prefs, + extent_item_pos, total_refs, + root_objectid); if (ret) goto out; - __merge_refs(&prefs, MERGE_IDENTICAL_PARENTS); + merge_refs(&prefs, MERGE_IDENTICAL_PARENTS); while (!list_empty(&prefs)) { - ref = list_first_entry(&prefs, struct __prelim_ref, list); + ref = list_first_entry(&prefs, struct prelim_ref, list); WARN_ON(ref->count < 0); if (roots && ref->count && ref->root_id && ref->parent == 0) { if (root_objectid && ref->root_id != root_objectid) { @@ -1457,12 +1449,12 @@ out: btrfs_free_path(path); ref_root_free(ref_tree); while (!list_empty(&prefs)) { - ref = list_first_entry(&prefs, struct __prelim_ref, list); + ref = list_first_entry(&prefs, struct prelim_ref, list); list_del(&ref->list); kmem_cache_free(btrfs_prelim_ref_cache, ref); } while (!list_empty(&prefs_delayed)) { - ref = list_first_entry(&prefs_delayed, struct __prelim_ref, + ref = list_first_entry(&prefs_delayed, struct prelim_ref, list); list_del(&ref->list); kmem_cache_free(btrfs_prelim_ref_cache, ref); @@ -1532,9 +1524,9 @@ static int btrfs_find_all_leafs(struct btrfs_trans_handle *trans, * * returns 0 on success, < 0 on error. */ -static int __btrfs_find_all_roots(struct btrfs_trans_handle *trans, - struct btrfs_fs_info *fs_info, u64 bytenr, - u64 time_seq, struct ulist **roots) +static int btrfs_find_all_roots_safe(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info, u64 bytenr, + u64 time_seq, struct ulist **roots) { struct ulist *tmp; struct ulist_node *node = NULL; @@ -1578,7 +1570,8 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans, if (!trans) down_read(&fs_info->commit_root_sem); - ret = __btrfs_find_all_roots(trans, fs_info, bytenr, time_seq, roots); + ret = btrfs_find_all_roots_safe(trans, fs_info, bytenr, + time_seq, roots); if (!trans) up_read(&fs_info->commit_root_sem); return ret; @@ -1877,17 +1870,17 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical, * helper function to iterate extent inline refs. ptr must point to a 0 value * for the first call and may be modified. it is used to track state. * if more refs exist, 0 is returned and the next call to - * __get_extent_inline_ref must pass the modified ptr parameter to get the + * get_extent_inline_ref must pass the modified ptr parameter to get the * next ref. after the last ref was processed, 1 is returned. * returns <0 on error */ -static int __get_extent_inline_ref(unsigned long *ptr, - const struct extent_buffer *eb, - const struct btrfs_key *key, - const struct btrfs_extent_item *ei, - u32 item_size, - struct btrfs_extent_inline_ref **out_eiref, - int *out_type) +static int get_extent_inline_ref(unsigned long *ptr, + const struct extent_buffer *eb, + const struct btrfs_key *key, + const struct btrfs_extent_item *ei, + u32 item_size, + struct btrfs_extent_inline_ref **out_eiref, + int *out_type) { unsigned long end; u64 flags; @@ -1930,7 +1923,7 @@ static int __get_extent_inline_ref(unsigned long *ptr, /* * reads the tree block backref for an extent. tree level and root are returned * through out_level and out_root. ptr must point to a 0 value for the first - * call and may be modified (see __get_extent_inline_ref comment). + * call and may be modified (see get_extent_inline_ref comment). * returns 0 if data was provided, 1 if there was no more data to provide or * <0 on error. */ @@ -1946,7 +1939,7 @@ int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb, return 1; while (1) { - ret = __get_extent_inline_ref(ptr, eb, key, ei, item_size, + ret = get_extent_inline_ref(ptr, eb, key, ei, item_size, &eiref, &type); if (ret < 0) return ret; @@ -2043,8 +2036,8 @@ int iterate_extent_inodes(struct btrfs_fs_info *fs_info, ULIST_ITER_INIT(&ref_uiter); while (!ret && (ref_node = ulist_next(refs, &ref_uiter))) { - ret = __btrfs_find_all_roots(trans, fs_info, ref_node->val, - tree_mod_seq_elem.seq, &roots); + ret = btrfs_find_all_roots_safe(trans, fs_info, ref_node->val, + tree_mod_seq_elem.seq, &roots); if (ret) break; ULIST_ITER_INIT(&root_uiter);