[libvirt] [PATCHv4 01/29] storage: Implement virStorageFileCreate for local and gluster files

[Peter Krempa]

Add backends for this frontend function so that we can use it in the
snapshot creation code.
---
 src/storage/storage_backend_fs.c      | 17 +++++++++++++++++
 src/storage/storage_backend_gluster.c | 28 ++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index c93fc1e..bd5cab8 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -1367,6 +1367,22 @@ virStorageFileBackendFileInit(virStorageSourcePtr src)


 static int
+virStorageFileBackendFileCreate(virStorageSourcePtr src)
+{
+    int fd = -1;
+
+    if ((fd = virFileOpenAs(src->path, O_WRONLY | O_TRUNC | O_CREAT, 0,
+                            src->drv->uid, src->drv->gid, 0)) < 0) {
+        errno = -fd;
+        return -1;
+    }
+
+    VIR_FORCE_CLOSE(fd);
+    return 0;
+}
+
+
+static int
 virStorageFileBackendFileUnlink(virStorageSourcePtr src)
 {
     return unlink(src->path);
@@ -1441,6 +1457,7 @@ virStorageFileBackend virStorageFileBackendFile = {
     .backendInit = virStorageFileBackendFileInit,
     .backendDeinit = virStorageFileBackendFileDeinit,

+    .storageFileCreate = virStorageFileBackendFileCreate,
     .storageFileUnlink = virStorageFileBackendFileUnlink,
     .storageFileStat = virStorageFileBackendFileStat,
     .storageFileReadHeader = virStorageFileBackendFileReadHeader,
diff --git a/src/storage/storage_backend_gluster.c 
b/src/storage/storage_backend_gluster.c
index cab23b0..6c94d61 100644
--- a/src/storage/storage_backend_gluster.c
+++ b/src/storage/storage_backend_gluster.c
@@ -623,6 +623,33 @@ virStorageFileBackendGlusterInit(virStorageSourcePtr src)


 static int
+virStorageFileBackendGlusterCreate(virStorageSourcePtr src)
+{
+    virStorageFileBackendGlusterPrivPtr priv = src->drv->priv;
+    glfs_fd_t *fd = NULL;
+    int save_errno;
+    int ret = -1;
+
+    if (!(fd = glfs_open(priv->vol, src->path, O_CREAT | O_TRUNC | O_WRONLY)))
+        return -1;
+
+    if (src->drv->uid != 0 || src->drv->gid != 0) {
+        if (glfs_fchown(fd, src->drv->uid, src->drv->gid) < 0)
+            goto cleanup;
+    }
+
+    ret = 0;
+
+ cleanup:
+    save_errno = errno;
+    ignore_value(glfs_close(fd));
+    errno = save_errno;
+
+    return ret;
+}
+
+
+static int
 virStorageFileBackendGlusterUnlink(virStorageSourcePtr src)
 {
     virStorageFileBackendGlusterPrivPtr priv = src->drv->priv;
@@ -797,6 +824,7 @@ virStorageFileBackend virStorageFileBackendGluster = {
     .backendInit = virStorageFileBackendGlusterInit,
     .backendDeinit = virStorageFileBackendGlusterDeinit,

+    .storageFileCreate = virStorageFileBackendGlusterCreate,
     .storageFileUnlink = virStorageFileBackendGlusterUnlink,
     .storageFileStat = virStorageFileBackendGlusterStat,
     .storageFileReadHeader = virStorageFileBackendGlusterReadHeader,
-- 
1.9.3

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