9p: Implement TMKNOD
Synopsis
size[4] Tmknod tag[2] fid[4] name[s] mode[4] major[4] minor[4] gid[4]
size[4] Rmknod tag[2] qid[13]
Description
mknod asks the file server to create a device node with given major and
minor number, mode and gid. The qid for the new device node is returned
with the mknod reply message.
[sripathik@in.ibm.com: Fix error handling code]
Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
M. Mohan Kumar
Eric Van Hensbergen
parent
50cc42ff3d
commit
4b43516ab1
@ -302,7 +302,13 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
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case S_IFBLK:
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case S_IFCHR:
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case S_IFSOCK:
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if (!v9fs_proto_dotu(v9ses)) {
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if (v9fs_proto_dotl(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations_dotl;
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inode->i_fop = &v9fs_file_operations_dotl;
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} else if (v9fs_proto_dotu(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations;
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inode->i_fop = &v9fs_file_operations;
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} else {
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P9_DPRINTK(P9_DEBUG_ERROR,
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"special files without extended mode\n");
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err = -EINVAL;
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@ -1616,6 +1622,100 @@ v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
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return retval;
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}
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/**
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* v9fs_vfs_mknod_dotl - create a special file
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* @dir: inode destination for new link
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* @dentry: dentry for file
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* @mode: mode for creation
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* @rdev: device associated with special file
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*
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*/
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static int
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v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int mode,
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dev_t rdev)
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{
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int err;
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char *name;
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struct v9fs_session_info *v9ses;
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struct p9_fid *fid = NULL, *dfid = NULL;
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struct inode *inode;
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gid_t gid;
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struct p9_qid qid;
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struct dentry *dir_entry;
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P9_DPRINTK(P9_DEBUG_VFS,
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" %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
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dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
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if (!new_valid_dev(rdev))
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return -EINVAL;
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v9ses = v9fs_inode2v9ses(dir);
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dir_dentry = v9fs_dentry_from_dir_inode(dir);
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dfid = v9fs_fid_lookup(dir_entry);
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if (IS_ERR(dfid)) {
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err = PTR_ERR(dfid);
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P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
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dfid = NULL;
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goto error;
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}
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gid = v9fs_get_fsgid_for_create(dir);
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if (gid < 0) {
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P9_DPRINTK(P9_DEBUG_VFS, "v9fs_get_fsgid_for_create failed\n");
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goto error;
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}
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name = (char *) dentry->d_name.name;
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err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
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if (err < 0)
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goto error;
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/* instantiate inode and assign the unopened fid to the dentry */
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if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
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fid = p9_client_walk(dfid, 1, &name, 1);
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if (IS_ERR(fid)) {
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err = PTR_ERR(fid);
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P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
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err);
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fid = NULL;
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goto error;
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}
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inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
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err);
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goto error;
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}
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dentry->d_op = &v9fs_cached_dentry_operations;
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d_instantiate(dentry, inode);
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err = v9fs_fid_add(dentry, fid);
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if (err < 0)
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goto error;
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fid = NULL;
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} else {
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/*
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* Not in cached mode. No need to populate inode with stat.
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* socket syscall returns a fd, so we need instantiate
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*/
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inode = v9fs_get_inode(dir->i_sb, mode);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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goto error;
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}
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dentry->d_op = &v9fs_dentry_operations;
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d_instantiate(dentry, inode);
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}
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error:
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if (fid)
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p9_client_clunk(fid);
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return err;
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}
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static const struct inode_operations v9fs_dir_inode_operations_dotu = {
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.create = v9fs_vfs_create,
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.lookup = v9fs_vfs_lookup,
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@ -1624,7 +1724,7 @@ static const struct inode_operations v9fs_dir_inode_operations_dotu = {
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.unlink = v9fs_vfs_unlink,
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.mkdir = v9fs_vfs_mkdir,
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.rmdir = v9fs_vfs_rmdir,
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.mknod = v9fs_vfs_mknod,
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.mknod = v9fs_vfs_mknod_dotl,
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.rename = v9fs_vfs_rename,
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.getattr = v9fs_vfs_getattr,
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.setattr = v9fs_vfs_setattr,
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@ -1638,7 +1738,7 @@ static const struct inode_operations v9fs_dir_inode_operations_dotl = {
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.unlink = v9fs_vfs_unlink,
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.mkdir = v9fs_vfs_mkdir,
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.rmdir = v9fs_vfs_rmdir,
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.mknod = v9fs_vfs_mknod,
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.mknod = v9fs_vfs_mknod_dotl,
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.rename = v9fs_vfs_rename,
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.getattr = v9fs_vfs_getattr_dotl,
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.setattr = v9fs_vfs_setattr_dotl,
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@ -90,6 +90,8 @@ do { \
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* @P9_RSTATFS: file system status response
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* @P9_TSYMLINK: make symlink request
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* @P9_RSYMLINK: make symlink response
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* @P9_TMKNOD: create a special file object request
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* @P9_RMKNOD: create a special file object response
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* @P9_TRENAME: rename request
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* @P9_RRENAME: rename response
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* @P9_TVERSION: version handshake request
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@ -135,6 +137,8 @@ enum p9_msg_t {
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P9_RSTATFS,
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P9_TSYMLINK = 16,
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P9_RSYMLINK,
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P9_TMKNOD = 18,
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P9_RMKNOD,
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P9_TRENAME = 20,
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P9_RRENAME,
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P9_TGETATTR = 24,
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@ -245,6 +245,8 @@ int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *attr);
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struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
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u64 request_mask);
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int p9_client_mknod_dotl(struct p9_fid *oldfid, char *name, int mode,
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dev_t rdev, gid_t gid, struct p9_qid *);
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struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
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void p9_client_cb(struct p9_client *c, struct p9_req_t *req);
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@ -1622,3 +1622,34 @@ error:
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return err;
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}
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EXPORT_SYMBOL(p9_client_readdir);
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int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
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dev_t rdev, gid_t gid, struct p9_qid *qid)
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{
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int err;
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struct p9_client *clnt;
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struct p9_req_t *req;
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err = 0;
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clnt = fid->clnt;
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P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
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"minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
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req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
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MAJOR(rdev), MINOR(rdev), gid);
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if (IS_ERR(req))
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return PTR_ERR(req);
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err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
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if (err) {
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p9pdu_dump(1, req->rc);
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goto error;
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}
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P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
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(unsigned long long)qid->path, qid->version);
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error:
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p9_free_req(clnt, req);
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return err;
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}
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EXPORT_SYMBOL(p9_client_mknod_dotl);
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