[Libguestfs] [PATCH] daemon: Alternate implementation of posix_fallocate.
Richard W.M. Jones
rjones at redhat.com
Wed Nov 25 11:43:23 UTC 2009
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
New in Fedora 11: Fedora Windows cross-compiler. Compile Windows
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http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw
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>From f6df273d53ba46042856ebe6b2c640c9b715a51b Mon Sep 17 00:00:00 2001
From: Richard Jones <rjones at redhat.com>
Date: Tue, 24 Nov 2009 16:16:08 +0000
Subject: [PATCH 3/4] daemon: Alternate implementation of posix_fallocate.
If the posix_fallocate function is not available [ie. Windows]
use an alternate implementation that just loops and writes.
---
daemon/configure.ac | 1 +
daemon/fallocate.c | 23 ++++++++++++++++++++++-
2 files changed, 23 insertions(+), 1 deletions(-)
diff --git a/daemon/configure.ac b/daemon/configure.ac
index 54d2a4c..7bcdd7e 100644
--- a/daemon/configure.ac
+++ b/daemon/configure.ac
@@ -179,6 +179,7 @@ AC_CHECK_FUNCS([\
lsetxattr \
lremovexattr \
mknod \
+ posix_fallocate \
removexattr \
setxattr])
diff --git a/daemon/fallocate.c b/daemon/fallocate.c
index 20a75e6..1800292 100644
--- a/daemon/fallocate.c
+++ b/daemon/fallocate.c
@@ -30,7 +30,7 @@
int
do_fallocate (const char *path, int len)
{
- int fd, r;
+ int fd;
CHROOT_IN;
fd = open (path, O_WRONLY | O_CREAT | O_TRUNC | O_NOCTTY, 0666);
@@ -40,12 +40,33 @@ do_fallocate (const char *path, int len)
return -1;
}
+#ifdef HAVE_POSIX_FALLOCATE
+ int r;
+
r = posix_fallocate (fd, 0, len);
if (r == -1) {
reply_with_perror ("posix_fallocate: %s", path);
close (fd);
return -1;
}
+#else
+ ssize_t r;
+ char buf[BUFSIZ];
+ const size_t len_sz = (size_t) len;
+ size_t n;
+
+ memset (buf, 0, BUFSIZ);
+ n = 0;
+ while (n < len_sz) {
+ r = write (fd, buf, len_sz - n < BUFSIZ ? len_sz - n : BUFSIZ);
+ if (r == -1) {
+ reply_with_perror ("write: %s", path);
+ close (fd);
+ return -1;
+ }
+ n += r;
+ }
+#endif
if (close (fd) == -1) {
reply_with_perror ("close: %s", path);
--
1.6.5.2
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