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2a709f28fa
* 0day explit mitigation * Memory corruption prevention * Privilege escalation prevention * Buffer over flow prevention * File System corruption defense * Thread escape prevention This may very well be the most intensive inclusion to BrooklynR. This will not be part of an x86 suite nor it will be released as tool kit. The security core toolkit will remain part of kernel base.
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
#ifndef FS_CEPH_FRAG_H
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#define FS_CEPH_FRAG_H
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/*
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* "Frags" are a way to describe a subset of a 32-bit number space,
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* using a mask and a value to match against that mask. Any given frag
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* (subset of the number space) can be partitioned into 2^n sub-frags.
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*
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* Frags are encoded into a 32-bit word:
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* 8 upper bits = "bits"
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* 24 lower bits = "value"
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* (We could go to 5+27 bits, but who cares.)
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*
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* We use the _most_ significant bits of the 24 bit value. This makes
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* values logically sort.
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*
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* Unfortunately, because the "bits" field is still in the high bits, we
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* can't sort encoded frags numerically. However, it does allow you
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* to feed encoded frags as values into frag_contains_value.
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*/
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static inline __u32 ceph_frag_make(__u32 b, __u32 v)
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{
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return (b << 24) |
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(v & (0xffffffu << (24-b)) & 0xffffffu);
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}
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static inline __u32 ceph_frag_bits(__u32 f)
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{
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return f >> 24;
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}
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static inline __u32 ceph_frag_value(__u32 f)
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{
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return f & 0xffffffu;
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}
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static inline __u32 ceph_frag_mask(__u32 f)
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{
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return (0xffffffu << (24-ceph_frag_bits(f))) & 0xffffffu;
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}
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static inline __u32 ceph_frag_mask_shift(__u32 f)
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{
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return 24 - ceph_frag_bits(f);
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}
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static inline bool ceph_frag_contains_value(__u32 f, __u32 v)
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{
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return (v & ceph_frag_mask(f)) == ceph_frag_value(f);
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}
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static inline __u32 ceph_frag_make_child(__u32 f, int by, int i)
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{
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int newbits = ceph_frag_bits(f) + by;
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return ceph_frag_make(newbits,
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ceph_frag_value(f) | (i << (24 - newbits)));
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}
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static inline bool ceph_frag_is_leftmost(__u32 f)
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{
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return ceph_frag_value(f) == 0;
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}
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static inline bool ceph_frag_is_rightmost(__u32 f)
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{
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return ceph_frag_value(f) == ceph_frag_mask(f);
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}
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static inline __u32 ceph_frag_next(__u32 f)
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{
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return ceph_frag_make(ceph_frag_bits(f),
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ceph_frag_value(f) + (0x1000000 >> ceph_frag_bits(f)));
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}
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/*
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* comparator to sort frags logically, as when traversing the
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* number space in ascending order...
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*/
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int ceph_frag_compare(__u32 a, __u32 b);
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#endif
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