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don't call posix_fallocate on linux if the file is fully allocated

This commit is contained in:
Arvid Norberg 2010-01-18 03:08:38 +00:00
parent 5d5ded4032
commit f1be2c6b80
1 changed files with 20 additions and 1 deletions
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21
src/file.cpp
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@ -1450,7 +1450,26 @@ namespace libtorrent
}
#elif defined TORRENT_LINUX
int ret = my_fallocate(m_fd, FALLOC_FL_KEEP_SIZE, 0, s);
if (ret != 0 && ret != EOPNOTSUPP && errno != ENOSYS)
if (ret == 0 && errno != ENOSYS) return true;
if (ret != EOPNOTSUPP) ec.assign(ret, get_posix_category());
// if fallocate failed, we have to use posix_fallocate
// which can be painfully slow, so only use it if we really
// have to
struct stat st;
if (fstat(m_fd, &st) != 0)
{
ec.assign(errno, get_posix_category());
return false;
}
// if the number of allocated blocks already matches
// the size of the file. No need to allocate it
if (st.st_blocks >= (s + st.st_blksize - 1) / st.st_blksize)
{
ec.clear();
return true;
}
ret = posix_fallocate(m_fd, 0, s);
if (ret != 0)
{
ec.assign(ret, get_posix_category());
return false;