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Pull out string hash to <linux/stringhash.h>

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... so they can be used without the rest of <linux/dcache.h>

The hashlen_* macros will make sense next patch.

Signed-off-by: George Spelvin <linux@sciencehorizons.net>
This commit is contained in:
George Spelvin
2016-05-20 07:26:00 -04:00
parent 0fed3ac866
commit f4bcbe792b
2 changed files with 73 additions and 26 deletions
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27
include/linux/dcache.h
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@@ -10,6 +10,7 @@
#include <linux/cache.h>
#include <linux/rcupdate.h>
#include <linux/lockref.h>
#include <linux/stringhash.h>
struct path;
struct vfsmount;
@@ -52,9 +53,6 @@ struct qstr {
};
#define QSTR_INIT(n,l) { { { .len = l } }, .name = n }
#define hashlen_hash(hashlen) ((u32) (hashlen))
#define hashlen_len(hashlen) ((u32)((hashlen) >> 32))
#define hashlen_create(hash,len) (((u64)(len)<<32)|(u32)(hash))
struct dentry_stat_t {
long nr_dentry;
@@ -65,29 +63,6 @@ struct dentry_stat_t {
};
extern struct dentry_stat_t dentry_stat;
/* Name hashing routines. Initial hash value */
/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
#define init_name_hash() 0
/* partial hash update function. Assume roughly 4 bits per character */
static inline unsigned long
partial_name_hash(unsigned long c, unsigned long prevhash)
{
return (prevhash + (c << 4) + (c >> 4)) * 11;
}
/*
* Finally: cut down the number of bits to a int value (and try to avoid
* losing bits)
*/
static inline unsigned long end_name_hash(unsigned long hash)
{
return (unsigned int) hash;
}
/* Compute the hash for a name string. */
extern unsigned int full_name_hash(const unsigned char *, unsigned int);
/*
* Try to keep struct dentry aligned on 64 byte cachelines (this will
* give reasonable cacheline footprint with larger lines without the