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btrfs: provide enumeration for __merge_refs mode argument

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Replace hardcoded numeric values for __merge_refs 'mode' argument
with descriptive constants.

Signed-off-by: Edmund Nadolski <enadolski@suse.com>
Reviewed-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Edmund Nadolski 2017-03-16 10:04:33 -06:00 committed by David Sterba
parent f486135eba
commit f58d88b336
1 changed files with 13 additions and 10 deletions
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23
fs/btrfs/backref.c
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@ -26,6 +26,11 @@
#include "delayed-ref.h"
#include "locking.h"
enum merge_mode {
MERGE_IDENTICAL_KEYS = 1,
MERGE_IDENTICAL_PARENTS,
};
/* Just an arbitrary number so we can be sure this happened */
#define BACKREF_FOUND_SHARED 6
@ -809,14 +814,12 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info,
/*
* merge backrefs and adjust counts accordingly
*
* mode = 1: merge identical keys, if key is set
* FIXME: if we add more keys in __add_prelim_ref, 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).
* mode = 2: merge identical parents
* 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, int mode)
static void __merge_refs(struct list_head *head, enum merge_mode mode)
{
struct __prelim_ref *pos1;
@ -829,7 +832,7 @@ static void __merge_refs(struct list_head *head, int mode)
if (!ref_for_same_block(ref1, ref2))
continue;
if (mode == 1) {
if (mode == MERGE_IDENTICAL_KEYS) {
if (!ref1->parent && ref2->parent)
swap(ref1, ref2);
} else {
@ -1374,7 +1377,7 @@ again:
if (ret)
goto out;
__merge_refs(&prefs, 1);
__merge_refs(&prefs, MERGE_IDENTICAL_KEYS);
ret = __resolve_indirect_refs(fs_info, path, time_seq, &prefs,
extent_item_pos, total_refs,
@ -1382,7 +1385,7 @@ again:
if (ret)
goto out;
__merge_refs(&prefs, 2);
__merge_refs(&prefs, MERGE_IDENTICAL_PARENTS);
while (!list_empty(&prefs)) {
ref = list_first_entry(&prefs, struct __prelim_ref, list);