Linus Torvalds 7e0fb73c52 Merge branch 'hash' of git://ftp.sciencehorizons.net/linux ... Pull string hash improvements from George Spelvin: "This series does several related things: - Makes the dcache hash (fs/namei.c) useful for general kernel use. (Thanks to Bruce for noticing the zero-length corner case) - Converts the string hashes in <linux/sunrpc/svcauth.h> to use the above. - Avoids 64-bit multiplies in hash_64() on 32-bit platforms. Two 32-bit multiplies will do well enough. - Rids the world of the bad hash multipliers in hash_32. This finishes the job started in commit 689de1d6ca ("Minimal fix-up of bad hashing behavior of hash_64()") The vast majority of Linux architectures have hardware support for 32x32-bit multiply and so derive no benefit from "simplified" multipliers. The few processors that do not (68000, h8/300 and some models of Microblaze) have arch-specific implementations added. Those patches are last in the series. - Overhauls the dcache hash mixing. The patch in commit 0fed3ac866 ("namei: Improve hash mixing if CONFIG_DCACHE_WORD_ACCESS") was an off-the-cuff suggestion. Replaced with a much more careful design that's simultaneously faster and better. (My own invention, as there was noting suitable in the literature I could find. Comments welcome!) - Modify the hash_name() loop to skip the initial HASH_MIX(). This would let us salt the hash if we ever wanted to. - Sort out partial_name_hash(). The hash function is declared as using a long state, even though it's truncated to 32 bits at the end and the extra internal state contributes nothing to the result. And some callers do odd things: - fs/hfs/string.c only allocates 32 bits of state - fs/hfsplus/unicode.c uses it to hash 16-bit unicode symbols not bytes - Modify bytemask_from_count to handle inputs of 1..sizeof(long) rather than 0..sizeof(long)-1. This would simplify users other than full_name_hash" Special thanks to Bruce Fields for testing and finding bugs in v1. (I learned some humbling lessons about "obviously correct" code.) On the arch-specific front, the m68k assembly has been tested in a standalone test harness, I've been in contact with the Microblaze maintainers who mostly don't care, as the hardware multiplier is never omitted in real-world applications, and I haven't heard anything from the H8/300 world" * 'hash' of git://ftp.sciencehorizons.net/linux: h8300: Add <asm/hash.h> microblaze: Add <asm/hash.h> m68k: Add <asm/hash.h> <linux/hash.h>: Add support for architecture-specific functions fs/namei.c: Improve dcache hash function Eliminate bad hash multipliers from hash_32() and hash_64() Change hash_64() return value to 32 bits <linux/sunrpc/svcauth.h>: Define hash_str() in terms of hashlen_string() fs/namei.c: Add hashlen_string() function Pull out string hash to <linux/stringhash.h>		2016-05-28 16:15:25 -07:00
..
addr.h
auth_gss.h
auth.h	SUNRPC: Ensure get_rpccred() and put_rpccred() can take NULL arguments	2016-05-17 15:48:06 -04:00
bc_xprt.h	SUNRPC: Abstract backchannel operations	2015-11-02 13:45:15 -05:00
cache.h	sunrpc/cache: make cache flushing more reliable.	2015-10-23 15:57:30 -04:00
clnt.h	sunrpc: Advertise maximum backchannel payload size	2016-05-17 15:47:57 -04:00
debug.h
gss_api.h
gss_asn1.h
gss_err.h
gss_krb5_enctypes.h
gss_krb5.h	sunrpc: Use skcipher and ahash/shash	2016-01-27 20:36:01 +08:00
metrics.h
msg_prot.h	sunrpc: Update RPCBIND_MAXNETIDLEN	2016-05-17 15:47:56 -04:00
rpc_pipe_fs.h
rpc_rdma.h	xprtrdma: Properly handle RDMA_ERROR replies	2016-03-14 14:55:59 -04:00
sched.h	SUNRPC: Allow caller to specify the transport to use	2016-02-05 18:48:55 -05:00
stats.h
svc_rdma.h	svcrdma: Generalize svc_rdma_xdr_decode_req()	2016-05-13 15:53:06 -04:00
svc_xprt.h	sunrpc: Add a function to close temporary transports immediately	2015-12-23 10:08:15 -05:00
svc.h	mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage	2016-04-04 10:41:08 -07:00
svcauth_gss.h
svcauth.h	<linux/sunrpc/svcauth.h>: Define hash_str() in terms of hashlen_string()	2016-05-28 15:42:50 -04:00
svcsock.h
timer.h
types.h
xdr.h
xprt.h	sunrpc: Advertise maximum backchannel payload size	2016-05-17 15:47:57 -04:00
xprtmultipath.h	SUNRPC: Add a structure to track multiple transports	2016-02-05 18:48:54 -05:00
xprtrdma.h	xprtrdma: Bound the inline threshold values	2016-05-17 15:47:57 -04:00
xprtsock.h	SUNRPC: Move TCP receive data path into a workqueue context	2015-10-08 08:27:04 -04:00