105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/*
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* Some non-inline ceph helpers
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*/
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#include "types.h"
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/*
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* return true if @layout appears to be valid
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*/
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int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
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{
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__u32 su = le32_to_cpu(layout->fl_stripe_unit);
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__u32 sc = le32_to_cpu(layout->fl_stripe_count);
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__u32 os = le32_to_cpu(layout->fl_object_size);
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/* stripe unit, object size must be non-zero, 64k increment */
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if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
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return 0;
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if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
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return 0;
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/* object size must be a multiple of stripe unit */
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if (os < su || os % su)
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return 0;
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/* stripe count must be non-zero */
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if (!sc)
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return 0;
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return 1;
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}
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int ceph_flags_to_mode(int flags)
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{
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#ifdef O_DIRECTORY /* fixme */
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if ((flags & O_DIRECTORY) == O_DIRECTORY)
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return CEPH_FILE_MODE_PIN;
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#endif
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#ifdef O_LAZY
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if (flags & O_LAZY)
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return CEPH_FILE_MODE_LAZY;
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#endif
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if ((flags & O_APPEND) == O_APPEND)
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flags |= O_WRONLY;
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flags &= O_ACCMODE;
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if ((flags & O_RDWR) == O_RDWR)
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return CEPH_FILE_MODE_RDWR;
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if ((flags & O_WRONLY) == O_WRONLY)
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return CEPH_FILE_MODE_WR;
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return CEPH_FILE_MODE_RD;
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}
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int ceph_caps_for_mode(int mode)
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{
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switch (mode) {
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case CEPH_FILE_MODE_PIN:
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return CEPH_CAP_PIN;
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case CEPH_FILE_MODE_RD:
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return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
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CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
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case CEPH_FILE_MODE_RDWR:
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return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
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CEPH_CAP_FILE_EXCL |
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CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE |
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CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
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CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
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CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
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case CEPH_FILE_MODE_WR:
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return CEPH_CAP_PIN | CEPH_CAP_FILE_SHARED |
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CEPH_CAP_FILE_EXCL |
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CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
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CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
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CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
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}
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return 0;
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}
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/* Name hashing routines. Initial hash value */
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/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
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#define ceph_init_name_hash() 0
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/* partial hash update function. Assume roughly 4 bits per character */
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static unsigned long ceph_partial_name_hash(unsigned long c,
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unsigned long prevhash)
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{
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return (prevhash + (c << 4) + (c >> 4)) * 11;
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}
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/*
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* Finally: cut down the number of bits to a int value (and try to avoid
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* losing bits)
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*/
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static unsigned long ceph_end_name_hash(unsigned long hash)
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{
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return hash & 0xffffffff;
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}
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/* Compute the hash for a name string. */
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unsigned int ceph_full_name_hash(const char *name, unsigned int len)
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{
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unsigned long hash = ceph_init_name_hash();
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while (len--)
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hash = ceph_partial_name_hash(*name++, hash);
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return ceph_end_name_hash(hash);
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}
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