1 // SPDX-License-Identifier: GPL-2.0-or-later
46 static const char afs_root_volume[] = "root.cell";
56 	return ERR_PTR(-EREMOTE);  in afs_mntpt_lookup()
65 	return -EREMOTE;  in afs_mntpt_open()
73 	struct afs_fs_context *ctx = fc->fs_private;  in afs_mntpt_set_params()
74 	struct afs_super_info *src_as = AFS_FS_S(mntpt->d_sb);  in afs_mntpt_set_params()
76 	struct afs_cell *cell;  in afs_mntpt_set_params()  local
80 	if (fc->net_ns != src_as->net_ns) {  in afs_mntpt_set_params()
81 		put_net(fc->net_ns);  in afs_mntpt_set_params()
82 		fc->net_ns = get_net(src_as->net_ns);  in afs_mntpt_set_params()
85 	if (src_as->volume && src_as->volume->type == AFSVL_RWVOL) {  in afs_mntpt_set_params()
86 		ctx->type = AFSVL_RWVOL;  in afs_mntpt_set_params()
87 		ctx->force = true;  in afs_mntpt_set_params()
89 	if (ctx->cell) {  in afs_mntpt_set_params()
90 		afs_unuse_cell(ctx->net, ctx->cell, afs_cell_trace_unuse_mntpt);  in afs_mntpt_set_params()
91 		ctx->cell = NULL;  in afs_mntpt_set_params()
93 	if (test_bit(AFS_VNODE_PSEUDODIR, &vnode->flags)) {  in afs_mntpt_set_params()
95 		unsigned size = mntpt->d_name.len;  in afs_mntpt_set_params()
97 		if (size < 2)  in afs_mntpt_set_params()
98 			return -ENOENT;  in afs_mntpt_set_params()
100 		p = mntpt->d_name.name;  in afs_mntpt_set_params()
101 		if (mntpt->d_name.name[0] == '.') {  in afs_mntpt_set_params()
102 			size--;  in afs_mntpt_set_params()
104 			ctx->type = AFSVL_RWVOL;  in afs_mntpt_set_params()
105 			ctx->force = true;  in afs_mntpt_set_params()
108 			return -ENAMETOOLONG;  in afs_mntpt_set_params()
110 		cell = afs_lookup_cell(ctx->net, p, size, NULL, false);  in afs_mntpt_set_params()
111 		if (IS_ERR(cell)) {  in afs_mntpt_set_params()
112 			pr_err("kAFS: unable to lookup cell '%pd'\n", mntpt);  in afs_mntpt_set_params()
113 			return PTR_ERR(cell);  in afs_mntpt_set_params()
115 		ctx->cell = cell;  in afs_mntpt_set_params()
117 		ctx->volname = afs_root_volume;  in afs_mntpt_set_params()
118 		ctx->volnamesz = sizeof(afs_root_volume) - 1;  in afs_mntpt_set_params()
125 		if (src_as->cell)  in afs_mntpt_set_params()
126 			ctx->cell = afs_use_cell(src_as->cell, afs_cell_trace_use_mntpt);  in afs_mntpt_set_params()
128 		if (size < 2 || size > PAGE_SIZE - 1)  in afs_mntpt_set_params()
129 			return -EINVAL;  in afs_mntpt_set_params()
131 		page = read_mapping_page(d_inode(mntpt)->i_mapping, 0, NULL);  in afs_mntpt_set_params()
136 		ret = -EINVAL;  in afs_mntpt_set_params()
137 		if (buf[size - 1] == '.')  in afs_mntpt_set_params()
138 			ret = vfs_parse_fs_string(fc, "source", buf, size - 1);  in afs_mntpt_set_params()
145 		if (src_as->volume && src_as->volume->type == AFSVL_BACKVOL &&  in afs_mntpt_set_params()
146 		    ctx->type == AFSVL_BACKVOL)  in afs_mntpt_set_params()
147 			return -ENODEV;  in afs_mntpt_set_params()
185 	_enter("{%pd}", path->dentry);  in afs_d_automount()
187 	newmnt = afs_mntpt_do_automount(path->dentry);  in afs_d_automount()