user/sven/linux.git/include/linux/stringhash.h, branch v4.7Linux Kernel
https://git.stealer.net/cgit.cgi/user/sven/linux.git/atom?h=v4.72016-05-28T19:42:50Zfs/namei.c: Add hashlen_string() function2016-05-28T19:42:50ZGeorge Spelvinlinux@sciencehorizons.net2016-05-20T12:41:37Zurn:sha1:fcfd2fbf22d2587196890103d41e3d554c47da0e
We'd like to make more use of the highly-optimized dcache hash functions
throughout the kernel, rather than have every subsystem create its own,
and a function that hashes basic null-terminated strings is required
for that.
(The name is to emphasize that it returns both hash and length.)
It's actually useful in the dcache itself, specifically d_alloc_name().
Other uses in the next patch.
full_name_hash() is also tweaked to make it more generally useful:
1) Take a "char *" rather than "unsigned char *" argument, to
be consistent with hash_name().
2) Handle zero-length inputs. If we want more callers, we don't want
to make them worry about corner cases.
Signed-off-by: George Spelvin <linux@sciencehorizons.net>
Pull out string hash to <linux/stringhash.h>2016-05-28T19:42:40ZGeorge Spelvinlinux@sciencehorizons.net2016-05-20T11:26:00Zurn:sha1:f4bcbe792b8f434e32487cff9d9e30ab45a3ce02
... 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>