76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef FS_CEPH_FRAG_H
|
||
|
|
#define FS_CEPH_FRAG_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* "Frags" are a way to describe a subset of a 32-bit number space,
|
||
|
|
* using a mask and a value to match against that mask. Any given frag
|
||
|
|
* (subset of the number space) can be partitioned into 2^n sub-frags.
|
||
|
|
*
|
||
|
|
* Frags are encoded into a 32-bit word:
|
||
|
|
* 8 upper bits = "bits"
|
||
|
|
* 24 lower bits = "value"
|
||
|
|
* (We could go to 5+27 bits, but who cares.)
|
||
|
|
*
|
||
|
|
* We use the _most_ significant bits of the 24 bit value. This makes
|
||
|
|
* values logically sort.
|
||
|
|
*
|
||
|
|
* Unfortunately, because the "bits" field is still in the high bits, we
|
||
|
|
* can't sort encoded frags numerically. However, it does allow you
|
||
|
|
* to feed encoded frags as values into frag_contains_value.
|
||
|
|
*/
|
||
|
|
static inline __u32 ceph_frag_make(__u32 b, __u32 v)
|
||
|
|
{
|
||
|
|
return (b << 24) |
|
||
|
|
(v & (0xffffffu << (24-b)) & 0xffffffu);
|
||
|
|
}
|
||
|
|
static inline __u32 ceph_frag_bits(__u32 f)
|
||
|
|
{
|
||
|
|
return f >> 24;
|
||
|
|
}
|
||
|
|
static inline __u32 ceph_frag_value(__u32 f)
|
||
|
|
{
|
||
|
|
return f & 0xffffffu;
|
||
|
|
}
|
||
|
|
static inline __u32 ceph_frag_mask(__u32 f)
|
||
|
|
{
|
||
|
|
return (0xffffffu << (24-ceph_frag_bits(f))) & 0xffffffu;
|
||
|
|
}
|
||
|
|
static inline __u32 ceph_frag_mask_shift(__u32 f)
|
||
|
|
{
|
||
|
|
return 24 - ceph_frag_bits(f);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline bool ceph_frag_contains_value(__u32 f, __u32 v)
|
||
|
|
{
|
||
|
|
return (v & ceph_frag_mask(f)) == ceph_frag_value(f);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline __u32 ceph_frag_make_child(__u32 f, int by, int i)
|
||
|
|
{
|
||
|
|
int newbits = ceph_frag_bits(f) + by;
|
||
|
|
return ceph_frag_make(newbits,
|
||
|
|
ceph_frag_value(f) | (i << (24 - newbits)));
|
||
|
|
}
|
||
|
|
static inline bool ceph_frag_is_leftmost(__u32 f)
|
||
|
|
{
|
||
|
|
return ceph_frag_value(f) == 0;
|
||
|
|
}
|
||
|
|
static inline bool ceph_frag_is_rightmost(__u32 f)
|
||
|
|
{
|
||
|
|
return ceph_frag_value(f) == ceph_frag_mask(f);
|
||
|
|
}
|
||
|
|
static inline __u32 ceph_frag_next(__u32 f)
|
||
|
|
{
|
||
|
|
return ceph_frag_make(ceph_frag_bits(f),
|
||
|
|
ceph_frag_value(f) + (0x1000000 >> ceph_frag_bits(f)));
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* comparator to sort frags logically, as when traversing the
|
||
|
|
* number space in ascending order...
|
||
|
|
*/
|
||
|
|
int ceph_frag_compare(__u32 a, __u32 b);
|
||
|
|
|
||
|
|
#endif
|