This patch adds support for the UNIX extensions to 9p2000.
Supporting thses extensions allow us to transperantly mount UNIX directories
without missing features such as symlinks.
Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx>
---
tools/kvm/include/kvm/virtio-9p.h | 4 +-
tools/kvm/virtio/9p-pdu.c | 6 ++-
tools/kvm/virtio/9p.c | 75 +++++++++++++++++++++++++++++++------
3 files changed, 69 insertions(+), 16 deletions(-)
diff --git a/tools/kvm/include/kvm/virtio-9p.h b/tools/kvm/include/kvm/virtio-9p.h
index 8584f49..0e55e5c 100644
--- a/tools/kvm/include/kvm/virtio-9p.h
+++ b/tools/kvm/include/kvm/virtio-9p.h
@@ -11,8 +11,8 @@
#define VIRTQUEUE_NUM 128
#define VIRTIO_P9_DEFAULT_TAG "kvm_9p"
#define VIRTIO_P9_HDR_LEN (sizeof(u32)+sizeof(u8)+sizeof(u16))
-#define VIRTIO_P9_MAX_FID 128
-#define VIRTIO_P9_VERSION "9P2000"
+#define VIRTIO_P9_MAX_FID 256
+#define VIRTIO_P9_VERSION "9P2000.u"
#define MAX_TAG_LEN 32
struct p9_msg {
diff --git a/tools/kvm/virtio/9p-pdu.c b/tools/kvm/virtio/9p-pdu.c
index 0c454db..8ed249f 100644
--- a/tools/kvm/virtio/9p-pdu.c
+++ b/tools/kvm/virtio/9p-pdu.c
@@ -200,13 +200,15 @@ static int virtio_p9_pdu_encode(struct p9_pdu *pdu, const char *fmt, va_list ap)
case 'S':
{
struct p9_wstat *stbuf = va_arg(ap, struct p9_wstat *);
- retval = virtio_p9_pdu_writef(pdu, "wwdQdddqssss",
+ retval = virtio_p9_pdu_writef(pdu, "wwdQdddqsssssddd",
stbuf->size, stbuf->type,
stbuf->dev, &stbuf->qid,
stbuf->mode, stbuf->atime,
stbuf->mtime, stbuf->length,
stbuf->name, stbuf->uid,
- stbuf->gid, stbuf->muid);
+ stbuf->gid, stbuf->muid,
+ stbuf->extension, stbuf->n_uid,
+ stbuf->n_gid, stbuf->n_muid);
}
break;
default:
diff --git a/tools/kvm/virtio/9p.c b/tools/kvm/virtio/9p.c
index 3b5555c..a6eafe0 100644
--- a/tools/kvm/virtio/9p.c
+++ b/tools/kvm/virtio/9p.c
@@ -162,7 +162,7 @@ static void virtio_p9_error_reply(struct p9_dev *p9dev,
err_str = strerror(err);
pdu->write_offset = VIRTIO_P9_HDR_LEN;
- virtio_p9_pdu_writef(pdu, "s", err_str);
+ virtio_p9_pdu_writef(pdu, "sd", err_str, -err);
*outlen = pdu->write_offset;
pdu->read_offset = sizeof(u32) + sizeof(u8);
@@ -204,7 +204,6 @@ static void virtio_p9_open(struct p9_dev *p9dev,
struct p9_qid qid;
struct p9_fid *new_fid;
-
virtio_p9_pdu_readf(pdu, "db", &fid, &mode);
new_fid = &p9dev->fids[fid];
@@ -242,13 +241,14 @@ static void virtio_p9_create(struct p9_dev *p9dev,
u8 mode;
u32 perm;
char *name;
+ char *ext = NULL;
u32 fid_val;
struct stat st;
struct p9_qid qid;
struct p9_fid *fid;
char full_path[PATH_MAX];
- virtio_p9_pdu_readf(pdu, "dsdb", &fid_val, &name, &perm, &mode);
+ virtio_p9_pdu_readf(pdu, "dsdbs", &fid_val, &name, &perm, &mode, &ext);
fid = &p9dev->fids[fid_val];
sprintf(full_path, "%s/%s", fid->abs_path, name);
@@ -262,6 +262,30 @@ static void virtio_p9_create(struct p9_dev *p9dev,
close_fid(p9dev, fid_val);
fid->dir = dir;
fid->is_dir = 1;
+ } else if (perm & P9_DMSYMLINK) {
+ int r;
+
+ r = symlink(ext, full_path);
+ if (r < 0)
+ goto err_out;
+ fd = open(full_path, omode2uflags(mode));
+ if (fd < 0)
+ goto err_out;
+ close_fid(p9dev, fid_val);
+ fid->fd = fd;
+ } else if (perm & P9_DMLINK) {
+ int r;
+ int ext_fid = atoi(ext);
+
+ r = link(p9dev->fids[ext_fid].abs_path, full_path);
+ if (r < 0)
+ goto err_out;
+
+ fd = open(full_path, omode2uflags(mode));
+ if (fd < 0)
+ goto err_out;
+ close_fid(p9dev, fid_val);
+ fid->fd = fd;
} else {
fd = open(full_path, omode2uflags(mode) | O_CREAT, 0777);
if (fd < 0)
@@ -294,7 +318,7 @@ static void virtio_p9_walk(struct p9_dev *p9dev,
u32 newfid_val;
struct p9_qid wqid;
struct p9_fid *new_fid;
-
+ int ret;
virtio_p9_pdu_readf(pdu, "ddw", &fid_val, &newfid_val, &nwname);
new_fid = &p9dev->fids[newfid_val];
@@ -315,8 +339,10 @@ static void virtio_p9_walk(struct p9_dev *p9dev,
/* Format the new path we're 'walk'ing into */
sprintf(tmp, "%s/%.*s",
fid->path, (int)strlen(str), str);
- if (lstat(rel_to_abs(p9dev, tmp, full_path), &st) < 0)
+ if (lstat(rel_to_abs(p9dev, tmp, full_path), &st) < 0) {
+ ret = ENOENT;
goto err_out;
+ }
st2qid(&st, &wqid);
new_fid->is_dir = S_ISDIR(st.st_mode);
@@ -340,7 +366,7 @@ static void virtio_p9_walk(struct p9_dev *p9dev,
virtio_p9_set_reply_header(pdu, *outlen);
return;
err_out:
- virtio_p9_error_reply(p9dev, pdu, errno, outlen);
+ virtio_p9_error_reply(p9dev, pdu, ret, outlen);
return;
}
@@ -381,6 +407,12 @@ err_out:
return;
}
+static void virtio_p9_free_stat(struct p9_wstat *wstat)
+{
+ free(wstat->extension);
+ free(wstat->name);
+}
+
static void virtio_p9_fill_stat(struct p9_dev *p9dev, const char *name,
struct stat *st, struct p9_wstat *wstat)
{
@@ -393,6 +425,17 @@ static void virtio_p9_fill_stat(struct p9_dev *p9dev, const char *name,
wstat->length = 0;
wstat->mode |= P9_DMDIR;
}
+ if(S_ISLNK(st->st_mode)) {
+ char tmp[PATH_MAX] = {0}, full_path[PATH_MAX] = {0};
+
+ rel_to_abs(p9dev, name, full_path);
+
+ if (readlink(full_path, tmp, PATH_MAX) > 0)
+ wstat->extension = strdup(tmp);
+ wstat->mode |= P9_DMSYMLINK;
+ } else {
+ wstat->extension = NULL;
+ }
wstat->atime = st->st_atime;
wstat->mtime = st->st_mtime;
@@ -401,14 +444,20 @@ static void virtio_p9_fill_stat(struct p9_dev *p9dev, const char *name,
wstat->uid = NULL;
wstat->gid = NULL;
wstat->muid = NULL;
+ wstat->n_uid = wstat->n_gid = wstat->n_muid = 0;
- /* NOTE: size shouldn't include its own length */
- /* size[2] type[2] dev[4] qid[13] */
- /* mode[4] atime[4] mtime[4] length[8]*/
- /* name[s] uid[s] gid[s] muid[s] */
- wstat->size = 2+4+13+4+4+4+8+2+2+2+2;
+ /*
+ * NOTE: size shouldn't include its own length
+ * size[2] type[2] dev[4] qid[13]
+ * mode[4] atime[4] mtime[4] length[8]
+ * name[s] uid[s] gid[s] muid[s]
+ * ext[s] uid[4] gid[4] muid[4]
+ */
+ wstat->size = 2+4+13+4+4+4+8+2+2+2+2+2+4+4+4;
if (wstat->name)
wstat->size += strlen(wstat->name);
+ if (wstat->extension)
+ wstat->size += strlen(wstat->extension);
}
static void virtio_p9_read(struct p9_dev *p9dev,
@@ -440,6 +489,7 @@ static void virtio_p9_read(struct p9_dev *p9dev,
read = pdu->write_offset;
virtio_p9_pdu_writef(pdu, "S", &wstat);
rcount += pdu->write_offset - read;
+ virtio_p9_free_stat(&wstat);
cur = readdir(fid->dir);
}
@@ -486,6 +536,7 @@ static void virtio_p9_stat(struct p9_dev *p9dev,
virtio_p9_pdu_writef(pdu, "wS", 0, &wstat);
*outlen = pdu->write_offset;
+ virtio_p9_free_stat(&wstat);
virtio_p9_set_reply_header(pdu, *outlen);
return;
err_out:
--
1.7.6
--
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