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ircd::fs: Use fd::map object for fincore() impl.

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This commit is contained in:
Jason Volk 2020-08-24 08:56:23 -07:00
parent f6475a2906
commit 64e5df1d86
1 changed files with 29 additions and 24 deletions
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53
ircd/fs.cc
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@ -806,45 +806,50 @@ ircd::fs::fincore(const fd &fd,
const size_t &count,
const read_opts &opts)
{
assert(opts.offset % info::page_size == 0);
using word_t = unsigned long long;
thread_local std::array<word_t, 64> tls_vec;
fs::map::opts map_opts;
map_opts.offset = buffer::align(opts.offset, info::page_size);
map_opts.blocking = false;
const size_t &map_size
{
count?: size(fd)
};
void *const &map
const size_t &map_pages
{
::mmap(nullptr, map_size, PROT_NONE, MAP_NONBLOCK | MAP_SHARED, int(fd), opts.offset)
(map_size + info::page_size - 1) / info::page_size
};
if(unlikely(map == MAP_FAILED))
throw_system_error(errno);
const custom_ptr<void> map_ptr
const size_t &vec_size
{
map, [&map_size](void *const &map)
{
syscall(::munmap, map, map_size);
}
std::max(map_pages / sizeof(word_t), 1UL)
};
using word_t = unsigned long long;
thread_local std::array<word_t, 64> tls_vec;
const size_t vec_size
const size_t &dynamic_vec_size
{
std::max(((map_size + info::page_size - 1) / info::page_size) / sizeof(word_t), 1UL)
};
assert(vec_size > 0 && vec_size < map_size);
const auto dynamic_vec_size
{
vec_size > tls_vec.size()? vec_size : 0UL
vec_size > tls_vec.size()?
vec_size:
0UL
};
std::vector<word_t> dynamic_vec(dynamic_vec_size);
auto *const vec(dynamic_vec_size? dynamic_vec.data(): tls_vec.data());
return fincore(map, map_size, reinterpret_cast<uint8_t *>(vec), vec_size);
auto *const vec
{
dynamic_vec_size?
dynamic_vec.data():
tls_vec.data()
};
assert(map_opts.offset % 4096 == 0);
const fs::map map
{
fd, map_opts, map_size
};
assert(vec_size > 0 && vec_size <= map_size);
return fincore(data(map), map_size, reinterpret_cast<uint8_t *>(vec), vec_size);
}
bool