On 07.01.2015 16:49, Ján Tomko wrote:
Remove the resize flag and use the same code path for all callers.
This flag was added by commit 18f0316 to allow virStorageFileResize
use 'safezero' while preserving the behavior.
Explicitly return -2 when a fallback to a different method should
be done, to make the code path more obvious.
Fail immediately when ftruncate fails in the mmap method,
as we did before commit 18f0316.
---
src/locking/lock_driver_sanlock.c | 4 ++--
src/storage/storage_backend.c | 2 +-
src/util/virfile.c | 34 ++++++++++++----------------------
src/util/virfile.h | 2 +-
src/util/virstoragefile.c | 13 ++++---------
5 files changed, 20 insertions(+), 35 deletions(-)
diff --git a/src/util/virfile.c b/src/util/virfile.c
index a2bf008..5f56005 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
-int safezero(int fd, off_t offset, off_t len, bool resize)
+int safezero(int fd, off_t offset, off_t len)
{
int ret;
- /* posix_fallocate returns 0 on success or error number on failure,
- * but errno is not set so use that to our advantage since we set
- * errno to the returned value if we make the call. If we don't make
- * the call because it doesn't exist, then errno won't change and
- * we can try other methods.
- */
- errno = 0;
ret = safezero_posix_fallocate(fd, offset, len);
- if (ret == 0 || errno != 0)
+ if (ret != -2)
return ret;
- if (resize)
- return safezero_sys_fallocate(fd, offset, len);
-
- if (safezero_mmap(fd, offset, len) == 0)
+ if (safezero_sys_fallocate(fd, offset, len) == 0)
return 0;
Aha! So we are sticking with best effort here. If libvirt was built with
SYS_fallocate defined, but is running under a kernel without the
syscall, we want to try other methods too. Makes sense.
+
+ ret = safezero_mmap(fd, offset, len);
+ if (ret != -2)
+ return ret;
return safezero_slow(fd, offset, len);
}
ACK
Michal
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