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authorHarsh Prateek Bora <harsh@linux.vnet.ibm.com>2011-10-12 19:11:25 +0530
committerAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2011-10-15 15:30:27 +0530
commitedb9eb7352b585c2b226487e3daa14871a5350d8 (patch)
tree7caddabe04c1a73da9b60e84ab28eeef2632f5a6 /hw
parente06a765efbe3239d4b6148727a29342ab234180e (diff)
downloadhqemu-edb9eb7352b585c2b226487e3daa14871a5350d8.zip
hqemu-edb9eb7352b585c2b226487e3daa14871a5350d8.tar.gz
hw/9pfs: Add st_gen support for handle based fs driver
Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'hw')
-rw-r--r--hw/9pfs/virtio-9p-handle.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/hw/9pfs/virtio-9p-handle.c b/hw/9pfs/virtio-9p-handle.c
index a04b142..98809f1 100644
--- a/hw/9pfs/virtio-9p-handle.c
+++ b/hw/9pfs/virtio-9p-handle.c
@@ -21,6 +21,24 @@
#include <sys/un.h>
#include <attr/xattr.h>
#include <unistd.h>
+#include <linux/fs.h>
+#ifdef CONFIG_LINUX_MAGIC_H
+#include <linux/magic.h>
+#endif
+#include <sys/ioctl.h>
+
+#ifndef XFS_SUPER_MAGIC
+#define XFS_SUPER_MAGIC 0x58465342
+#endif
+#ifndef EXT2_SUPER_MAGIC
+#define EXT2_SUPER_MAGIC 0xEF53
+#endif
+#ifndef REISERFS_SUPER_MAGIC
+#define REISERFS_SUPER_MAGIC 0x52654973
+#endif
+#ifndef BTRFS_SUPER_MAGIC
+#define BTRFS_SUPER_MAGIC 0x9123683E
+#endif
struct handle_data {
int mountfd;
@@ -554,9 +572,31 @@ static int handle_unlinkat(FsContext *ctx, V9fsPath *dir,
return ret;
}
+static int handle_ioc_getversion(FsContext *ctx, V9fsPath *path,
+ mode_t st_mode, uint64_t *st_gen)
+{
+ int err, fd;
+
+ /*
+ * Do not try to open special files like device nodes, fifos etc
+ * We can get fd for regular files and directories only
+ */
+ if (!S_ISREG(st_mode) && !S_ISDIR(st_mode)) {
+ return 0;
+ }
+ fd = handle_open(ctx, path, O_RDONLY);
+ if (fd < 0) {
+ return fd;
+ }
+ err = ioctl(fd, FS_IOC_GETVERSION, st_gen);
+ handle_close(ctx, fd);
+ return err;
+}
+
static int handle_init(FsContext *ctx)
{
int ret, mnt_id;
+ struct statfs stbuf;
struct file_handle fh;
struct handle_data *data = g_malloc(sizeof(struct handle_data));
@@ -565,6 +605,17 @@ static int handle_init(FsContext *ctx)
ret = data->mountfd;
goto err_out;
}
+ ret = statfs(ctx->fs_root, &stbuf);
+ if (!ret) {
+ switch (stbuf.f_type) {
+ case EXT2_SUPER_MAGIC:
+ case BTRFS_SUPER_MAGIC:
+ case REISERFS_SUPER_MAGIC:
+ case XFS_SUPER_MAGIC:
+ ctx->exops.get_st_gen = handle_ioc_getversion;
+ break;
+ }
+ }
memset(&fh, 0, sizeof(struct file_handle));
ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0);
if (ret && errno == EOVERFLOW) {
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