v2:
- close fd after use in local_ioc_getversion
Signed-off-by: Harsh Prateek Bora <ha...@linux.vnet.ibm.com>
---
fsdev/file-op-9p.h | 7 +++++++
hw/9pfs/cofile.c | 22 ++++++++++++++++++++++
hw/9pfs/virtio-9p-coth.h | 2 ++
hw/9pfs/virtio-9p-device.c | 1 +
hw/9pfs/virtio-9p-local.c | 33 ++++++++++++++++++++++++++++++++-
hw/9pfs/virtio-9p.c | 9 +++++++++
6 files changed, 73 insertions(+), 1 deletions(-)
diff --git a/fsdev/file-op-9p.h b/fsdev/file-op-9p.h
index a6940bb..e6a5055 100644
--- a/fsdev/file-op-9p.h
+++ b/fsdev/file-op-9p.h
@@ -49,6 +49,12 @@ typedef struct FsCred
} FsCred;
struct xattr_operations;
+struct FsContext;
+struct V9fsPath;
+
+typedef struct extended_ops {
+ int (*get_st_gen)(struct FsContext *, struct V9fsPath *, uint64_t *);
+} extended_ops;
/* FsContext flag values */
#define PATHNAME_FSCONTEXT 0x1
@@ -62,6 +68,7 @@ typedef struct FsContext
int open_flags;
int cache_model;
struct xattr_operations **xops;
+ struct extended_ops exops;
/* fs driver specific data */
void *private;
} FsContext;
diff --git a/hw/9pfs/cofile.c b/hw/9pfs/cofile.c
index 7ad4bec..bf7c44b 100644
--- a/hw/9pfs/cofile.c
+++ b/hw/9pfs/cofile.c
@@ -17,6 +17,28 @@
#include "qemu-coroutine.h"
#include "virtio-9p-coth.h"
+int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, V9fsStatDotl *v9stat)
+{
+ int err;
+ V9fsState *s = pdu->s;
+
+ if (v9fs_request_cancelled(pdu)) {
+ return -EINTR;
+ }
+ if (s->ctx.exops.get_st_gen) {
+ v9fs_path_read_lock(s);
+ v9fs_co_run_in_worker(
+ {
+ err = s->ctx.exops.get_st_gen(&s->ctx, path, &v9stat->st_gen);
+ if (err < 0) {
+ err = -errno;
+ }
+ });
+ v9fs_path_unlock(s);
+ }
+ return err;
+}
+
int v9fs_co_lstat(V9fsPDU *pdu, V9fsPath *path, struct stat *stbuf)
{
int err;
diff --git a/hw/9pfs/virtio-9p-coth.h b/hw/9pfs/virtio-9p-coth.h
index 4630080..c9e9325 100644
--- a/hw/9pfs/virtio-9p-coth.h
+++ b/hw/9pfs/virtio-9p-coth.h
@@ -101,4 +101,6 @@ extern int v9fs_co_preadv(V9fsPDU *, V9fsFidState *,
struct iovec *, int, int64_t);
extern int v9fs_co_name_to_path(V9fsPDU *, V9fsPath *,
const char *, V9fsPath *);
+extern int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, V9fsStatDotl *v9stat);
+
#endif
diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 246da23..6a969ba 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -122,6 +122,7 @@ VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf
*conf)
}
s->ctx.cache_model = fse->cache_model;
s->ctx.fs_root = qemu_strdup(fse->path);
+ s->ctx.exops.get_st_gen = NULL;
len = strlen(conf->tag);
if (len > MAX_TAG_LEN) {
len = MAX_TAG_LEN;
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 1b6c323..0918dba 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -20,6 +20,9 @@
#include <sys/socket.h>
#include <sys/un.h>
#include <attr/xattr.h>
+#include <linux/fs.h>
+#include <linux/magic.h>
+#include <sys/ioctl.h>
static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat
*stbuf)
{
@@ -645,10 +648,38 @@ static int local_unlinkat(FsContext *ctx, V9fsPath *dir,
return ret;
}
+static int local_ioc_getversion(FsContext *ctx, V9fsPath *path, uint64_t
*st_gen)
+{
+ int mode = 0600;
+ int fd, err;
+
+ fd = local_open(ctx, path, mode);
+ if(fd < 0) {
+ return fd;
+ }
+ err = ioctl(fd, FS_IOC_GETVERSION, st_gen);
+ local_close(ctx, fd);
+ return err;
+}
+/* XFS_SUPER_MAGIC not available in linux/fs.h */
+#define XFS_SUPER_MAGIC 0x58465342
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 EXT4_SUPER_MAGIC: /* same magic val for ext2/3 */
+ 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 = {
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index 8b5e711..469668f 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -1357,6 +1357,15 @@ static void v9fs_getattr(void *opaque)
goto out;
}
stat_to_v9stat_dotl(s, &stbuf, &v9stat_dotl);
+
+ /* fill st_gen if requested and supported by underlying fs */
+ if (request_mask & P9_STATS_GEN) {
+ retval = v9fs_co_st_gen(pdu, &fidp->path, &v9stat_dotl);
+ if (retval < 0) {
+ goto out;
+ }
+ v9stat_dotl.st_result_mask |= P9_STATS_GEN;
+ }
retval = offset;
retval += pdu_marshal(pdu, offset, "A", &v9stat_dotl);
out:
--
1.7.1.1
