ceph: on-wire types (0dee3c28) · Commits · e / devices / android_kernel_fairphone_FP5

fs/ceph/ceph_fs.c

0 → 100644

+80 −0

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		/*
		* Some non-inline ceph helpers
		*/
		#include "types.h"

		int ceph_flags_to_mode(int flags)
		{
		#ifdef O_DIRECTORY /* fixme */
		if ((flags & O_DIRECTORY) == O_DIRECTORY)
		return CEPH_FILE_MODE_PIN;
		#endif
		#ifdef O_LAZY
		if (flags & O_LAZY)
		return CEPH_FILE_MODE_LAZY;
		#endif
		if ((flags & O_APPEND) == O_APPEND)
		flags \|= O_WRONLY;

		flags &= O_ACCMODE;
		if ((flags & O_RDWR) == O_RDWR)
		return CEPH_FILE_MODE_RDWR;
		if ((flags & O_WRONLY) == O_WRONLY)
		return CEPH_FILE_MODE_WR;
		return CEPH_FILE_MODE_RD;
		}

		int ceph_caps_for_mode(int mode)
		{
		switch (mode) {
		case CEPH_FILE_MODE_PIN:
		return CEPH_CAP_PIN;
		case CEPH_FILE_MODE_RD:
		return CEPH_CAP_PIN \| CEPH_CAP_FILE_SHARED \|
		CEPH_CAP_FILE_RD \| CEPH_CAP_FILE_CACHE;
		case CEPH_FILE_MODE_RDWR:
		return CEPH_CAP_PIN \| CEPH_CAP_FILE_SHARED \|
		CEPH_CAP_FILE_EXCL \|
		CEPH_CAP_FILE_RD \| CEPH_CAP_FILE_CACHE \|
		CEPH_CAP_FILE_WR \| CEPH_CAP_FILE_BUFFER \|
		CEPH_CAP_AUTH_SHARED \| CEPH_CAP_AUTH_EXCL \|
		CEPH_CAP_XATTR_SHARED \| CEPH_CAP_XATTR_EXCL;
		case CEPH_FILE_MODE_WR:
		return CEPH_CAP_PIN \| CEPH_CAP_FILE_SHARED \|
		CEPH_CAP_FILE_EXCL \|
		CEPH_CAP_FILE_WR \| CEPH_CAP_FILE_BUFFER \|
		CEPH_CAP_AUTH_SHARED \| CEPH_CAP_AUTH_EXCL \|
		CEPH_CAP_XATTR_SHARED \| CEPH_CAP_XATTR_EXCL;
		}
		return 0;
		}

		/* Name hashing routines. Initial hash value */
		/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
		#define ceph_init_name_hash() 0

		/* partial hash update function. Assume roughly 4 bits per character */
		static unsigned long ceph_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 unsigned long ceph_end_name_hash(unsigned long hash)
		{
		return hash & 0xffffffff;
		}

		/* Compute the hash for a name string. */
		unsigned int ceph_full_name_hash(const char *name, unsigned int len)
		{
		unsigned long hash = ceph_init_name_hash();
		while (len--)
		hash = ceph_partial_name_hash(*name++, hash);
		return ceph_end_name_hash(hash);
		}