[libvirt] [PATCH 1/4] Introduce virFileSync

[Jiri Denemark]

It still needs to be enhanced to be fully portable and working even if
fsync() implementation is insane (e.g., on OSX).
---
Notes:
    Although ideally gnulib would provide us with a sane fsync() and
    fdatasync() replacements (it already does so for fsync on Win32)
    so this could probably be dropped in favor of a possible future
    extension of gnulib (we do not provide any better solution anyway).

 src/libvirt_private.syms |    1 +
 src/util/virfile.c       |   16 ++++++++++++++++
 src/util/virfile.h       |    2 ++
 3 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index dedbd16..9666a0a 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1172,6 +1172,7 @@ virFileDirectFdFree;
 virFileDirectFdNew;
 virFileFclose;
 virFileFdopen;
+virFileSync;
 
 
 # virnetmessage.h
diff --git a/src/util/virfile.c b/src/util/virfile.c
index 1158998..50b8aab 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -334,3 +334,19 @@ int virFileUnlock(int fd ATTRIBUTE_UNUSED,
     return -ENOSYS;
 }
 #endif
+
+int
+virFileSync(int fd, bool metadata)
+{
+    int ret;
+
+    /* XXX This needs to be enhanced to properly sync even on OSX which
+     * lacks sane fsync() */
+
+    if (metadata)
+        ret = fsync(fd);
+    else
+        ret = fdatasync(fd);
+
+    return ret;
+}
diff --git a/src/util/virfile.h b/src/util/virfile.h
index e025614..0b14e1d 100644
--- a/src/util/virfile.h
+++ b/src/util/virfile.h
@@ -68,4 +68,6 @@ void virFileDirectFdFree(virFileDirectFdPtr dfd);
 int virFileLock(int fd, bool shared, off_t start, off_t len);
 int virFileUnlock(int fd, off_t start, off_t len);
 
+int virFileSync(int fd, bool metadata);
+
 #endif /* __VIR_FILES_H */
-- 
1.7.7