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hw/9pfs: Add st_gen support in getattr reply

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This patch use file system specific ioctl for getting i_generation
value. Not all file system support the ioctl. So we add an export
specific extended operation and assign right callback for the
file system that support i_generation ioctl

["M. Mohan Kumar" <mohan@in.ibm.com> we can do ioctl only for
regular files and directories on the server]

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 9844081bca
commit e06a765efb
7 changed files with 116 additions and 1 deletions
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54
hw/9pfs/virtio-9p-local.c
View file

@ -20,6 +20,24 @@
#include <sys/socket.h>
#include <sys/un.h>
#include <attr/xattr.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
static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
{
@ -659,10 +677,44 @@ static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
return ret;
}
static int local_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 = local_open(ctx, path, O_RDONLY);
if (fd < 0) {
return fd;
}
err = ioctl(fd, FS_IOC_GETVERSION, st_gen);
local_close(ctx, fd);
return err;
}
static int local_init(FsContext *ctx)
{
int err;
struct statfs stbuf;
ctx->flags |= PATHNAME_FSCONTEXT;
return 0;
err = statfs(ctx->fs_root, &stbuf);
if (!err) {
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 = local_ioc_getversion;
break;
}
}
return err;
}
FileOperations local_ops = {