[virtio-9p] Define and implement TSYMLINK for 9P2000.L
This patch implements creating a symlink for TSYMLINK request and responds with RSYMLINK. In the case of error, we return RERROR. SYNOPSIS size[4] Tsymlink tag[2] fid[4] name[s] symtgt[s] gid[4] size[4] Rsymlink tag[2] qid[13] DESCRIPTION Create a symbolic link named 'name' pointing to 'symtgt'. gid represents the effective group id of the caller. The permissions of a symbolic link are irrelevant hence it is omitted from the protocol. Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
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b2c224be19
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@ -464,6 +464,17 @@ void pprint_pdu(V9fsPDU *pdu)
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pprint_qid(pdu, 1, &offset, "qid");
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pprint_int32(pdu, 1, &offset, ", iounit");
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break;
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case P9_TSYMLINK:
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fprintf(llogfile, "TSYMLINK: (");
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pprint_int32(pdu, 0, &offset, "fid");
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pprint_str(pdu, 0, &offset, ", name");
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pprint_str(pdu, 0, &offset, ", symname");
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pprint_int32(pdu, 0, &offset, ", gid");
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break;
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case P9_RSYMLINK:
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fprintf(llogfile, "RSYMLINK: (");
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pprint_qid(pdu, 1, &offset, "qid");
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break;
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case P9_TREAD:
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fprintf(llogfile, "TREAD: (");
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pprint_int32(pdu, 0, &offset, "fid");
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@ -200,15 +200,16 @@ static int v9fs_do_open2(V9fsState *s, V9fsCreateState *vs)
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return s->ops->open2(&s->ctx, vs->fullname.data, flags, &cred);
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}
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static int v9fs_do_symlink(V9fsState *s, V9fsCreateState *vs)
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static int v9fs_do_symlink(V9fsState *s, V9fsFidState *fidp,
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const char *oldpath, const char *newpath, gid_t gid)
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{
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FsCred cred;
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cred_init(&cred);
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cred.fc_uid = vs->fidp->uid;
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cred.fc_mode = vs->perm | 0777;
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cred.fc_uid = fidp->uid;
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cred.fc_gid = gid;
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cred.fc_mode = 0777;
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return s->ops->symlink(&s->ctx, vs->extension.data, vs->fullname.data,
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&cred);
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return s->ops->symlink(&s->ctx, oldpath, newpath, &cred);
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}
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static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
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@ -2212,7 +2213,8 @@ static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
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err = v9fs_do_mkdir(s, vs);
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v9fs_create_post_mkdir(s, vs, err);
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} else if (vs->perm & P9_STAT_MODE_SYMLINK) {
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err = v9fs_do_symlink(s, vs);
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err = v9fs_do_symlink(s, vs->fidp, vs->extension.data,
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vs->fullname.data, -1);
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v9fs_create_post_perms(s, vs, err);
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} else if (vs->perm & P9_STAT_MODE_LINK) {
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int32_t nfid = atoi(vs->extension.data);
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@ -2301,6 +2303,69 @@ out:
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qemu_free(vs);
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}
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static void v9fs_post_symlink(V9fsState *s, V9fsSymlinkState *vs, int err)
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{
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if (err == 0) {
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stat_to_qid(&vs->stbuf, &vs->qid);
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vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qid);
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err = vs->offset;
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} else {
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err = -errno;
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}
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complete_pdu(s, vs->pdu, err);
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v9fs_string_free(&vs->name);
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v9fs_string_free(&vs->symname);
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v9fs_string_free(&vs->fullname);
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qemu_free(vs);
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}
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static void v9fs_symlink_post_do_symlink(V9fsState *s, V9fsSymlinkState *vs,
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int err)
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{
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if (err) {
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goto out;
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}
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err = v9fs_do_lstat(s, &vs->fullname, &vs->stbuf);
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out:
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v9fs_post_symlink(s, vs, err);
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}
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static void v9fs_symlink(V9fsState *s, V9fsPDU *pdu)
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{
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int32_t dfid;
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V9fsSymlinkState *vs;
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int err = 0;
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gid_t gid;
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vs = qemu_malloc(sizeof(*vs));
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vs->pdu = pdu;
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vs->offset = 7;
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v9fs_string_init(&vs->fullname);
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pdu_unmarshal(vs->pdu, vs->offset, "dssd", &dfid, &vs->name,
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&vs->symname, &gid);
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vs->dfidp = lookup_fid(s, dfid);
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if (vs->dfidp == NULL) {
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err = -EINVAL;
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goto out;
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}
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v9fs_string_sprintf(&vs->fullname, "%s/%s", vs->dfidp->path.data,
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vs->name.data);
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err = v9fs_do_symlink(s, vs->dfidp, vs->symname.data,
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vs->fullname.data, gid);
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v9fs_symlink_post_do_symlink(s, vs, err);
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return;
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out:
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complete_pdu(s, vs->pdu, err);
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v9fs_string_free(&vs->name);
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v9fs_string_free(&vs->symname);
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qemu_free(vs);
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}
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static void v9fs_flush(V9fsState *s, V9fsPDU *pdu)
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{
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/* A nop call with no return */
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@ -2718,6 +2783,7 @@ static pdu_handler_t *pdu_handlers[] = {
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#endif
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[P9_TFLUSH] = v9fs_flush,
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[P9_TLINK] = v9fs_link,
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[P9_TSYMLINK] = v9fs_symlink,
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[P9_TCREATE] = v9fs_create,
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[P9_TWRITE] = v9fs_write,
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[P9_TWSTAT] = v9fs_wstat,
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@ -15,6 +15,8 @@
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enum {
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P9_TSTATFS = 8,
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P9_RSTATFS,
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P9_TSYMLINK = 16,
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P9_RSYMLINK,
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P9_TGETATTR = 24,
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P9_RGETATTR,
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P9_TSETATTR = 26,
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@ -294,6 +296,18 @@ typedef struct V9fsWstatState
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V9fsString nname;
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} V9fsWstatState;
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typedef struct V9fsSymlinkState
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{
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V9fsPDU *pdu;
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size_t offset;
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V9fsString name;
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V9fsString symname;
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V9fsString fullname;
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V9fsFidState *dfidp;
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V9fsQID qid;
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struct stat stbuf;
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} V9fsSymlinkState;
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typedef struct V9fsIattr
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{
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int32_t valid;
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