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提交 e0c476b1 编写于 作者: J Jeff Mahoney 提交者： David Sterba
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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: NJeff Mahoney <jeffm@suse.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>
上级 4dae077a
隐藏空白更改
内联 并排
Showing with 109 addition and 116 deletion
fs/btrfs/backref.c
浏览文件 @ e0c476b1
......@@ -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 @@ static int add_all_parents(struct btrfs_root *root, struct btrfs_path *path,
* 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 @@ static int __resolve_indirect_refs(struct btrfs_fs_info *fs_info,
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 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
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 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
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 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
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 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans,
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);
......
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