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bcachefs: Add some comments for btree iterator flags

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Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2020-01-09 20:43:58 -05:00
committed by Kent Overstreet
parent ae54c4539b
commit d98a5e3945
1 changed files with 16 additions and 0 deletions
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16
fs/bcachefs/btree_types.h
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@@ -187,9 +187,25 @@ enum btree_iter_type {
#define BTREE_ITER_TYPE ((1 << 2) - 1)
/*
* Iterate over all possible positions, synthesizing deleted keys for holes:
*/
#define BTREE_ITER_SLOTS (1 << 2)
/*
* Indicates that intent locks should be taken on leaf nodes, because we expect
* to be doing updates:
*/
#define BTREE_ITER_INTENT (1 << 3)
/*
* Causes the btree iterator code to prefetch additional btree nodes from disk:
*/
#define BTREE_ITER_PREFETCH (1 << 4)
/*
* Indicates that this iterator should not be reused until transaction commit,
* either because a pending update references it or because the update depends
* on that particular key being locked (e.g. by the str_hash code, for hash
* table consistency)
*/
#define BTREE_ITER_KEEP_UNTIL_COMMIT (1 << 5)
/*
* Used in bch2_btree_iter_traverse(), to indicate whether we're searching for