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-rw-r--r--mkfs.ubifs/key.h392
1 files changed, 24 insertions, 368 deletions
diff --git a/mkfs.ubifs/key.h b/mkfs.ubifs/key.h
index 2bdd431..d3a02d4 100644
--- a/mkfs.ubifs/key.h
+++ b/mkfs.ubifs/key.h
@@ -38,6 +38,22 @@
#define __UBIFS_KEY_H__
/**
+ * key_mask_hash - mask a valid hash value.
+ * @val: value to be masked
+ *
+ * We use hash values as offset in directories, so values %0 and %1 are
+ * reserved for "." and "..". %2 is reserved for "end of readdir" marker. This
+ * function makes sure the reserved values are not used.
+ */
+static inline uint32_t key_mask_hash(uint32_t hash)
+{
+ hash &= UBIFS_S_KEY_HASH_MASK;
+ if (unlikely(hash <= 2))
+ hash += 3;
+ return hash;
+}
+
+/**
* key_r5_hash - R5 hash function (borrowed from reiserfs).
* @s: direntry name
* @len: name length
@@ -47,6 +63,7 @@ static inline uint32_t key_r5_hash(const char *s, int len)
uint32_t a = 0;
const signed char *str = (const signed char *)s;
+ len = len;
while (*str) {
a += *str << 4;
a += *str >> 4;
@@ -54,16 +71,7 @@ static inline uint32_t key_r5_hash(const char *s, int len)
str++;
}
- a &= UBIFS_S_KEY_HASH_MASK;
-
- /*
- * We use hash values as offset in directories, so values %0 and %1 are
- * reserved for "." and "..". %2 is reserved for "end of readdir"
- * marker.
- */
- if (unlikely(a >= 0 && a <= 2))
- a += 3;
- return a;
+ return key_mask_hash(a);
}
/**
@@ -77,10 +85,7 @@ static inline uint32_t key_test_hash(const char *str, int len)
len = min_t(uint32_t, len, 4);
memcpy(&a, str, len);
- a &= UBIFS_S_KEY_HASH_MASK;
- if (unlikely(a >= 0 && a <= 2))
- a += 3;
- return a;
+ return key_mask_hash(a);
}
/**
@@ -89,56 +94,13 @@ static inline uint32_t key_test_hash(const char *str, int len)
* @key: key to initialize
* @inum: inode number
*/
-static inline void ino_key_init(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum)
+static inline void ino_key_init(union ubifs_key *key, ino_t inum)
{
key->u32[0] = inum;
key->u32[1] = UBIFS_INO_KEY << UBIFS_S_KEY_BLOCK_BITS;
}
/**
- * ino_key_init_flash - initialize on-flash inode key.
- * @c: UBIFS file-system description object
- * @k: key to initialize
- * @inum: inode number
- */
-static inline void ino_key_init_flash(const struct ubifs_info *c, void *k,
- ino_t inum)
-{
- union ubifs_key *key = k;
-
- key->j32[0] = cpu_to_le32(inum);
- key->j32[1] = cpu_to_le32(UBIFS_INO_KEY << UBIFS_S_KEY_BLOCK_BITS);
- memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
-}
-
-/**
- * lowest_ino_key - get the lowest possible inode key.
- * @c: UBIFS file-system description object
- * @key: key to initialize
- * @inum: inode number
- */
-static inline void lowest_ino_key(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum)
-{
- key->u32[0] = inum;
- key->u32[1] = 0;
-}
-
-/**
- * highest_ino_key - get the highest possible inode key.
- * @c: UBIFS file-system description object
- * @key: key to initialize
- * @inum: inode number
- */
-static inline void highest_ino_key(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum)
-{
- key->u32[0] = inum;
- key->u32[1] = 0xffffffff;
-}
-
-/**
* dent_key_init - initialize directory entry key.
* @c: UBIFS file-system description object
* @key: key to initialize
@@ -157,132 +119,13 @@ static inline void dent_key_init(const struct ubifs_info *c,
}
/**
- * dent_key_init_hash - initialize directory entry key without re-calculating
- * hash function.
- * @c: UBIFS file-system description object
- * @key: key to initialize
- * @inum: parent inode number
- * @hash: direntry name hash
- */
-static inline void dent_key_init_hash(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum,
- uint32_t hash)
-{
- ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
- key->u32[0] = inum;
- key->u32[1] = hash | (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS);
-}
-
-/**
- * dent_key_init_flash - initialize on-flash directory entry key.
- * @c: UBIFS file-system description object
- * @k: key to initialize
- * @inum: parent inode number
- * @nm: direntry name and length
- */
-static inline void dent_key_init_flash(const struct ubifs_info *c, void *k,
- ino_t inum, const struct qstr *nm)
-{
- union ubifs_key *key = k;
- uint32_t hash = c->key_hash(nm->name, nm->len);
-
- ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
- key->j32[0] = cpu_to_le32(inum);
- key->j32[1] = cpu_to_le32(hash |
- (UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS));
- memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
-}
-
-/**
- * lowest_dent_key - get the lowest possible directory entry key.
- * @c: UBIFS file-system description object
- * @key: where to store the lowest key
- * @inum: parent inode number
- */
-static inline void lowest_dent_key(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum)
-{
- key->u32[0] = inum;
- key->u32[1] = UBIFS_DENT_KEY << UBIFS_S_KEY_HASH_BITS;
-}
-
-/**
- * xent_key_init - initialize extended attribute entry key.
- * @c: UBIFS file-system description object
- * @key: key to initialize
- * @inum: host inode number
- * @nm: extended attribute entry name and length
- */
-static inline void xent_key_init(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum,
- const struct qstr *nm)
-{
- uint32_t hash = c->key_hash(nm->name, nm->len);
-
- ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
- key->u32[0] = inum;
- key->u32[1] = hash | (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS);
-}
-
-/**
- * xent_key_init_hash - initialize extended attribute entry key without
- * re-calculating hash function.
- * @c: UBIFS file-system description object
- * @key: key to initialize
- * @inum: host inode number
- * @hash: extended attribute entry name hash
- */
-static inline void xent_key_init_hash(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum,
- uint32_t hash)
-{
- ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
- key->u32[0] = inum;
- key->u32[1] = hash | (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS);
-}
-
-/**
- * xent_key_init_flash - initialize on-flash extended attribute entry key.
- * @c: UBIFS file-system description object
- * @k: key to initialize
- * @inum: host inode number
- * @nm: extended attribute entry name and length
- */
-static inline void xent_key_init_flash(const struct ubifs_info *c, void *k,
- ino_t inum, const struct qstr *nm)
-{
- union ubifs_key *key = k;
- uint32_t hash = c->key_hash(nm->name, nm->len);
-
- ubifs_assert(!(hash & ~UBIFS_S_KEY_HASH_MASK));
- key->j32[0] = cpu_to_le32(inum);
- key->j32[1] = cpu_to_le32(hash |
- (UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS));
- memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
-}
-
-/**
- * lowest_xent_key - get the lowest possible extended attribute entry key.
- * @c: UBIFS file-system description object
- * @key: where to store the lowest key
- * @inum: host inode number
- */
-static inline void lowest_xent_key(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum)
-{
- key->u32[0] = inum;
- key->u32[1] = UBIFS_XENT_KEY << UBIFS_S_KEY_HASH_BITS;
-}
-
-/**
* data_key_init - initialize data key.
* @c: UBIFS file-system description object
* @key: key to initialize
* @inum: inode number
* @block: block number
*/
-static inline void data_key_init(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum,
+static inline void data_key_init(union ubifs_key *key, ino_t inum,
unsigned int block)
{
ubifs_assert(!(block & ~UBIFS_S_KEY_BLOCK_MASK));
@@ -291,157 +134,12 @@ static inline void data_key_init(const struct ubifs_info *c,
}
/**
- * data_key_init_flash - initialize on-flash data key.
- * @c: UBIFS file-system description object
- * @k: key to initialize
- * @inum: inode number
- * @block: block number
- */
-static inline void data_key_init_flash(const struct ubifs_info *c, void *k,
- ino_t inum, unsigned int block)
-{
- union ubifs_key *key = k;
-
- ubifs_assert(!(block & ~UBIFS_S_KEY_BLOCK_MASK));
- key->j32[0] = cpu_to_le32(inum);
- key->j32[1] = cpu_to_le32(block |
- (UBIFS_DATA_KEY << UBIFS_S_KEY_BLOCK_BITS));
- memset(k + 8, 0, UBIFS_MAX_KEY_LEN - 8);
-}
-
-/**
- * trun_key_init - initialize truncation node key.
- * @c: UBIFS file-system description object
- * @key: key to initialize
- * @inum: inode number
- *
- * Note, UBIFS does not have truncation keys on the media and this function is
- * only used for purposes of replay.
- */
-static inline void trun_key_init(const struct ubifs_info *c,
- union ubifs_key *key, ino_t inum)
-{
- key->u32[0] = inum;
- key->u32[1] = UBIFS_TRUN_KEY << UBIFS_S_KEY_BLOCK_BITS;
-}
-
-/**
- * key_type - get key type.
- * @c: UBIFS file-system description object
- * @key: key to get type of
- */
-static inline int key_type(const struct ubifs_info *c,
- const union ubifs_key *key)
-{
- return key->u32[1] >> UBIFS_S_KEY_BLOCK_BITS;
-}
-
-/**
- * key_type_flash - get type of a on-flash formatted key.
- * @c: UBIFS file-system description object
- * @k: key to get type of
- */
-static inline int key_type_flash(const struct ubifs_info *c, const void *k)
-{
- const union ubifs_key *key = k;
-
- return le32_to_cpu(key->u32[1]) >> UBIFS_S_KEY_BLOCK_BITS;
-}
-
-/**
- * key_ino - fetch inode number from key.
- * @c: UBIFS file-system description object
- * @k: key to fetch inode number from
- */
-static inline ino_t key_ino(const struct ubifs_info *c, const void *k)
-{
- const union ubifs_key *key = k;
-
- return key->u32[0];
-}
-
-/**
- * key_ino_flash - fetch inode number from an on-flash formatted key.
- * @c: UBIFS file-system description object
- * @k: key to fetch inode number from
- */
-static inline ino_t key_ino_flash(const struct ubifs_info *c, const void *k)
-{
- const union ubifs_key *key = k;
-
- return le32_to_cpu(key->j32[0]);
-}
-
-/**
- * key_hash - get directory entry hash.
- * @c: UBIFS file-system description object
- * @key: the key to get hash from
- */
-static inline int key_hash(const struct ubifs_info *c,
- const union ubifs_key *key)
-{
- return key->u32[1] & UBIFS_S_KEY_HASH_MASK;
-}
-
-/**
- * key_hash_flash - get directory entry hash from an on-flash formatted key.
- * @c: UBIFS file-system description object
- * @k: the key to get hash from
- */
-static inline int key_hash_flash(const struct ubifs_info *c, const void *k)
-{
- const union ubifs_key *key = k;
-
- return le32_to_cpu(key->j32[1]) & UBIFS_S_KEY_HASH_MASK;
-}
-
-/**
- * key_block - get data block number.
- * @c: UBIFS file-system description object
- * @key: the key to get the block number from
- */
-static inline unsigned int key_block(const struct ubifs_info *c,
- const union ubifs_key *key)
-{
- return key->u32[1] & UBIFS_S_KEY_BLOCK_MASK;
-}
-
-/**
- * key_block_flash - get data block number from an on-flash formatted key.
- * @c: UBIFS file-system description object
- * @k: the key to get the block number from
- */
-static inline unsigned int key_block_flash(const struct ubifs_info *c,
- const void *k)
-{
- const union ubifs_key *key = k;
-
- return le32_to_cpu(key->u32[1]) & UBIFS_S_KEY_BLOCK_MASK;
-}
-
-/**
- * key_read - transform a key to in-memory format.
- * @c: UBIFS file-system description object
- * @from: the key to transform
- * @to: the key to store the result
- */
-static inline void key_read(const struct ubifs_info *c, const void *from,
- union ubifs_key *to)
-{
- const union ubifs_key *f = from;
-
- to->u32[0] = le32_to_cpu(f->j32[0]);
- to->u32[1] = le32_to_cpu(f->j32[1]);
-}
-
-/**
* key_write - transform a key from in-memory format.
* @c: UBIFS file-system description object
* @from: the key to transform
* @to: the key to store the result
*/
-static inline void key_write(const struct ubifs_info *c,
- const union ubifs_key *from, void *to)
+static inline void key_write(const union ubifs_key *from, void *to)
{
union ubifs_key *t = to;
@@ -456,8 +154,7 @@ static inline void key_write(const struct ubifs_info *c,
* @from: the key to transform
* @to: the key to store the result
*/
-static inline void key_write_idx(const struct ubifs_info *c,
- const union ubifs_key *from, void *to)
+static inline void key_write_idx(const union ubifs_key *from, void *to)
{
union ubifs_key *t = to;
@@ -466,18 +163,6 @@ static inline void key_write_idx(const struct ubifs_info *c,
}
/**
- * key_copy - copy a key.
- * @c: UBIFS file-system description object
- * @from: the key to copy from
- * @to: the key to copy to
- */
-static inline void key_copy(const struct ubifs_info *c,
- const union ubifs_key *from, union ubifs_key *to)
-{
- to->u64[0] = from->u64[0];
-}
-
-/**
* keys_cmp - compare keys.
* @c: UBIFS file-system description object
* @key1: the first key to compare
@@ -486,8 +171,7 @@ static inline void key_copy(const struct ubifs_info *c,
* 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.
*/
-static inline int keys_cmp(const struct ubifs_info *c,
- const union ubifs_key *key1,
+static inline int keys_cmp(const union ubifs_key *key1,
const union ubifs_key *key2)
{
if (key1->u32[0] < key2->u32[0])
@@ -502,32 +186,4 @@ static inline int keys_cmp(const struct ubifs_info *c,
return 0;
}
-/**
- * is_hash_key - is a key vulnerable to hash collisions.
- * @c: UBIFS file-system description object
- * @key: key
- *
- * This function returns %1 if @key is a hashed key or %0 otherwise.
- */
-static inline int is_hash_key(const struct ubifs_info *c,
- const union ubifs_key *key)
-{
- int type = key_type(c, key);
-
- return type == UBIFS_DENT_KEY || type == UBIFS_XENT_KEY;
-}
-
-/**
- * key_max_inode_size - get maximum file size allowed by current key format.
- * @c: UBIFS file-system description object
- */
-static inline unsigned long long key_max_inode_size(const struct ubifs_info *c)
-{
- switch (c->key_fmt) {
- case UBIFS_SIMPLE_KEY_FMT:
- return (1ULL << UBIFS_S_KEY_BLOCK_BITS) * UBIFS_BLOCK_SIZE;
- default:
- return 0;
- }
-}
#endif /* !__UBIFS_KEY_H__ */