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btrfs: provide enumeration for __merge_refs mode argument
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>
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@ -26,6 +26,11 @@
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#include "delayed-ref.h"
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#include "locking.h"
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enum merge_mode {
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MERGE_IDENTICAL_KEYS = 1,
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MERGE_IDENTICAL_PARENTS,
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};
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/* Just an arbitrary number so we can be sure this happened */
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#define BACKREF_FOUND_SHARED 6
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@ -809,14 +814,12 @@ static int __add_missing_keys(struct btrfs_fs_info *fs_info,
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/*
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* merge backrefs and adjust counts accordingly
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*
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* mode = 1: merge identical keys, if key is set
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* FIXME: if we add more keys in __add_prelim_ref, we can merge more here.
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* additionally, we could even add a key range for the blocks we
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* looked into to merge even more (-> replace unresolved refs by those
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* having a parent).
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* mode = 2: merge identical parents
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* FIXME: For MERGE_IDENTICAL_KEYS, if we add more keys in __add_prelim_ref
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* then we can merge more here. Additionally, we could even add a key
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* range for the blocks we looked into to merge even more (-> replace
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* unresolved refs by those having a parent).
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*/
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static void __merge_refs(struct list_head *head, int mode)
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static void __merge_refs(struct list_head *head, enum merge_mode mode)
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{
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struct __prelim_ref *pos1;
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@ -829,7 +832,7 @@ static void __merge_refs(struct list_head *head, int mode)
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if (!ref_for_same_block(ref1, ref2))
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continue;
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if (mode == 1) {
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if (mode == MERGE_IDENTICAL_KEYS) {
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if (!ref1->parent && ref2->parent)
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swap(ref1, ref2);
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} else {
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@ -1374,7 +1377,7 @@ again:
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if (ret)
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goto out;
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__merge_refs(&prefs, 1);
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__merge_refs(&prefs, MERGE_IDENTICAL_KEYS);
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ret = __resolve_indirect_refs(fs_info, path, time_seq, &prefs,
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extent_item_pos, total_refs,
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@ -1382,7 +1385,7 @@ again:
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if (ret)
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goto out;
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__merge_refs(&prefs, 2);
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__merge_refs(&prefs, MERGE_IDENTICAL_PARENTS);
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while (!list_empty(&prefs)) {
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ref = list_first_entry(&prefs, struct __prelim_ref, list);
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