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bcache: Add bch_bkey_equal_header() 

Checks if two keys have equivalent header fields.
(good enough for replacement or merging)

Used in bch_bkey_try_merge, and replacing a key
in the btree.

Signed-off-by: Nicholas Swenson <nks@daterainc.com>
Signed-off-by: Kent Overstreet <kmo@daterainc.com>
This commit is contained in:
Nicholas Swenson 2013-11-11 19:36:25 -08:00 committed by Kent Overstreet
parent 0f49cf3d83
commit 3bdad1e40d
3 changed files with 11 additions and 8 deletions
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6
drivers/md/bcache/bset.c
View File

@ -788,11 +788,7 @@ bool bch_bkey_try_merge(struct btree_keys *b, struct bkey *l, struct bkey *r)
* Assumes left and right are in order
* Left and right must be exactly aligned
*/
if (KEY_U64s(l) != KEY_U64s(r) ||
KEY_DELETED(l) != KEY_DELETED(r) ||
KEY_CACHED(l) != KEY_CACHED(r) ||
KEY_VERSION(l) != KEY_VERSION(r) ||
KEY_CSUM(l) != KEY_CSUM(r) ||
if (!bch_bkey_equal_header(l, r) ||
bkey_cmp(l, &START_KEY(r)))
return false;

8
drivers/md/bcache/bset.h
View File

@ -448,6 +448,14 @@ static inline void bch_bkey_to_text(struct btree_keys *b, char *buf,
return b->ops->key_to_text(buf, size, k);
}
static inline bool bch_bkey_equal_header(const struct bkey *l,
const struct bkey *r)
{
return (KEY_DIRTY(l) == KEY_DIRTY(r) &&
KEY_PTRS(l) == KEY_PTRS(r) &&
KEY_CSUM(l) == KEY_CSUM(l));
}
/* Keylists */
struct keylist {

3
drivers/md/bcache/extents.c
View File

@ -372,8 +372,7 @@ static bool bch_extent_insert_fixup(struct btree_keys *b,
if (KEY_START(k) > KEY_START(insert) + sectors_found)
goto check_failed;
if (KEY_PTRS(k) != KEY_PTRS(replace_key) ||
KEY_DIRTY(k) != KEY_DIRTY(replace_key))
if (!bch_bkey_equal_header(k, replace_key))
goto check_failed;
/* skip past gen */