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authorAdrian Hunter <ext-adrian.hunter@nokia.com>2008-09-02 16:29:46 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-09-30 11:12:56 +0300
commit4793e7c5e1c88382ead18db5ca072bac54467318 (patch)
tree07e5e99d988b28fed07d5a01141169362c5a007d /fs/ubifs/key.h
parenta70948b564e9f6cb81115c606d46f5b74a77b7c2 (diff)
downloadlinux-4793e7c5e1c88382ead18db5ca072bac54467318.tar.bz2
UBIFS: add bulk-read facility
Some flash media are capable of reading sequentially at faster rates. UBIFS bulk-read facility is designed to take advantage of that, by reading in one go consecutive data nodes that are also located consecutively in the same LEB. Read speed on Arm platform with OneNAND goes from 17 MiB/s to 19 MiB/s. Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.com>
Diffstat (limited to 'fs/ubifs/key.h')
-rw-r--r--fs/ubifs/key.h22
1 files changed, 21 insertions, 1 deletions
diff --git a/fs/ubifs/key.h b/fs/ubifs/key.h
index 8f7476007549..9ee65086f627 100644
--- a/fs/ubifs/key.h
+++ b/fs/ubifs/key.h
@@ -484,7 +484,7 @@ static inline void key_copy(const struct ubifs_info *c,
* @key2: the second key to compare
*
* This function compares 2 keys and returns %-1 if @key1 is less than
- * @key2, 0 if the keys are equivalent and %1 if @key1 is greater than @key2.
+ * @key2, %0 if the keys are equivalent and %1 if @key1 is greater than @key2.
*/
static inline int keys_cmp(const struct ubifs_info *c,
const union ubifs_key *key1,
@@ -503,6 +503,26 @@ static inline int keys_cmp(const struct ubifs_info *c,
}
/**
+ * keys_eq - determine if keys are equivalent.
+ * @c: UBIFS file-system description object
+ * @key1: the first key to compare
+ * @key2: the second key to compare
+ *
+ * This function compares 2 keys and returns %1 if @key1 is equal to @key2 and
+ * %0 if not.
+ */
+static inline int keys_eq(const struct ubifs_info *c,
+ const union ubifs_key *key1,
+ const union ubifs_key *key2)
+{
+ if (key1->u32[0] != key2->u32[0])
+ return 0;
+ if (key1->u32[1] != key2->u32[1])
+ return 0;
+ return 1;
+}
+
+/**
* is_hash_key - is a key vulnerable to hash collisions.
* @c: UBIFS file-system description object
* @key: key