[PATCH] virfile: workaround for when posix_fallocate() is not supported by FS
posix_fallocate() might be not supported by a filesystem, for example,
it's not supported by ZFS. In that case it fails with
return code 22 (EINVAL), and thus safezero_posix_fallocate() returns -1.
As safezero_posix_fallocate() is the first function tried by safezero()
and it tries other functions only when it returns -2, it fails
immediately without falling back to other methods, such as
safezero_slow().
Fix that by returning -2 if posix_fallocate() returns EINVAL, to give
safezero() a chance to try other functions.
Signed-off-by: Roman Bogorodskiy <bogorodskiy(a)gmail.com>
---
src/util/virfile.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/src/util/virfile.c b/src/util/virfile.c
index 609cafdd34..67a350deb3 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -1119,6 +1119,16 @@ safezero_posix_fallocate(int fd, off_t offset, off_t len)
int ret = posix_fallocate(fd, offset, len);
if (ret == 0)
return 0;
+ else if (ret == EINVAL)
+ /* EINVAL is returned when either:
+ - Operation is not supported by the underlying filesystem,
+ - offset or len argument values are invalid.
+ Assuming that offset and len are valid, this error means
+ the operation is not supported, and we need to fall back
+ to other methods.
+ */
+ return -2;
+
errno = ret;
return -1;
}
--
2.30.0