rt/snapraid
1
0
Fork 0
mirror of https://github.com/amadvance/snapraid.git synced 2026-10-26 19:01:57 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

Uses fallocate() instead of posix_fallocate().

Browse source
This commit is contained in:
Andrea Mazzoleni 2012-01-21 13:08:35 +01:00
parent 457eaf829c
commit 07da751bb4
3 changed files with 23 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

22
parity.c
View file

@ -73,9 +73,25 @@ int parity_create(struct snapraid_parity* parity, const char* path, data_off_t s
parity->valid_size = parity->st.st_size;
if (parity->st.st_size < size) {
#if HAVE_POSIX_FALLOCATE
/* allocate real space */
ret = posix_fallocate(parity->f, 0, size);
#if HAVE_FALLOCATE
/* allocate real space using the specific Linux fallocate() operation. */
/* If the underline filesystem doesn't support it, it's going to fail with the ENOSYS error. */
/* Note that posix_fallocate() doesn't fail in such case, and fallbacks to write the whole file. */
ret = fallocate(parity->f, 0, 0, size);
/* fallocate() returns the error number, and it doesn't set errno, just like posix_fallocate() */
/* It's not clear if this is correct or a bug, as the official manpage says otherwise */
/* http://www.kernel.org/doc/man-pages/online/pages/man2/fallocate.2.html */
if (ret > 0) { /* if an error is returned, move it to errno */
errno = ret;
ret = -1;
}
/* if the operation is not supported, like in ext3 */
if (errno == EOPNOTSUPP || errno == ENOSYS) {
/* fallback using ftruncate() */
ret = ftruncate(parity->f, size);
}
#else
/* allocate using a sparse file */
ret = ftruncate(parity->f, size);