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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>
This commit is contained in:
Harsh Prateek Bora 2011-10-12 19:11:25 +05:30 committed by Aneesh Kumar K.V
parent e06a765efb
commit edb9eb7352
1 changed files with 51 additions and 0 deletions
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51
hw/9pfs/virtio-9p-handle.c
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@ -21,6 +21,24 @@
#include <sys/un.h> #include <sys/un.h>
#include <attr/xattr.h> #include <attr/xattr.h>
#include <unistd.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 { struct handle_data {
int mountfd; int mountfd;
@ -554,9 +572,31 @@ static int handle_unlinkat(FsContext *ctx, V9fsPath *dir,
return ret; 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) static int handle_init(FsContext *ctx)
{ {
int ret, mnt_id; int ret, mnt_id;
struct statfs stbuf;
struct file_handle fh; struct file_handle fh;
struct handle_data *data = g_malloc(sizeof(struct handle_data)); struct handle_data *data = g_malloc(sizeof(struct handle_data));
@ -565,6 +605,17 @@ static int handle_init(FsContext *ctx)
ret = data->mountfd; ret = data->mountfd;
goto err_out; 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)); memset(&fh, 0, sizeof(struct file_handle));
ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0); ret = name_to_handle(data->mountfd, ".", &fh, &mnt_id, 0);
if (ret && errno == EOVERFLOW) { if (ret && errno == EOVERFLOW) {