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1 | /* |
1 | /* |
2 | * Copyright (c) 2009 Jakub Jermar |
2 | * Copyright (c) 2009 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup libfs |
29 | /** @addtogroup libfs |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** |
32 | /** |
33 | * @file |
33 | * @file |
34 | * Glue code which is commonod to all FS implementations. |
34 | * Glue code which is commonod to all FS implementations. |
35 | */ |
35 | */ |
36 | 36 | ||
37 | #include "libfs.h" |
37 | #include "libfs.h" |
38 | #include "../../srv/vfs/vfs.h" |
38 | #include "../../srv/vfs/vfs.h" |
39 | #include <errno.h> |
39 | #include <errno.h> |
40 | #include <async.h> |
40 | #include <async.h> |
41 | #include <ipc/ipc.h> |
41 | #include <ipc/ipc.h> |
42 | #include <as.h> |
42 | #include <as.h> |
43 | #include <assert.h> |
43 | #include <assert.h> |
44 | #include <dirent.h> |
44 | #include <dirent.h> |
45 | 45 | ||
46 | /** Register file system server. |
46 | /** Register file system server. |
47 | * |
47 | * |
48 | * This function abstracts away the tedious registration protocol from |
48 | * This function abstracts away the tedious registration protocol from |
49 | * file system implementations and lets them to reuse this registration glue |
49 | * file system implementations and lets them to reuse this registration glue |
50 | * code. |
50 | * code. |
51 | * |
51 | * |
52 | * @param vfs_phone Open phone for communication with VFS. |
52 | * @param vfs_phone Open phone for communication with VFS. |
53 | * @param reg File system registration structure. It will be |
53 | * @param reg File system registration structure. It will be |
54 | * initialized by this function. |
54 | * initialized by this function. |
55 | * @param info VFS info structure supplied by the file system |
55 | * @param info VFS info structure supplied by the file system |
56 | * implementation. |
56 | * implementation. |
57 | * @param conn Connection fibril for handling all calls originating in |
57 | * @param conn Connection fibril for handling all calls originating in |
58 | * VFS. |
58 | * VFS. |
59 | * |
59 | * |
60 | * @return EOK on success or a non-zero error code on errror. |
60 | * @return EOK on success or a non-zero error code on errror. |
61 | */ |
61 | */ |
62 | int fs_register(int vfs_phone, fs_reg_t *reg, vfs_info_t *info, |
62 | int fs_register(int vfs_phone, fs_reg_t *reg, vfs_info_t *info, |
63 | async_client_conn_t conn) |
63 | async_client_conn_t conn) |
64 | { |
64 | { |
65 | /* |
65 | /* |
66 | * Tell VFS that we are here and want to get registered. |
66 | * Tell VFS that we are here and want to get registered. |
67 | * We use the async framework because VFS will answer the request |
67 | * We use the async framework because VFS will answer the request |
68 | * out-of-order, when it knows that the operation succeeded or failed. |
68 | * out-of-order, when it knows that the operation succeeded or failed. |
69 | */ |
69 | */ |
70 | ipc_call_t answer; |
70 | ipc_call_t answer; |
71 | aid_t req = async_send_0(vfs_phone, VFS_REGISTER, &answer); |
71 | aid_t req = async_send_0(vfs_phone, VFS_REGISTER, &answer); |
72 | 72 | ||
73 | /* |
73 | /* |
74 | * Send our VFS info structure to VFS. |
74 | * Send our VFS info structure to VFS. |
75 | */ |
75 | */ |
76 | int rc = ipc_data_write_start(vfs_phone, info, sizeof(*info)); |
76 | int rc = ipc_data_write_start(vfs_phone, info, sizeof(*info)); |
77 | if (rc != EOK) { |
77 | if (rc != EOK) { |
78 | async_wait_for(req, NULL); |
78 | async_wait_for(req, NULL); |
79 | return rc; |
79 | return rc; |
80 | } |
80 | } |
81 | 81 | ||
82 | /* |
82 | /* |
83 | * Ask VFS for callback connection. |
83 | * Ask VFS for callback connection. |
84 | */ |
84 | */ |
85 | ipc_connect_to_me(vfs_phone, 0, 0, 0, ®->vfs_phonehash); |
85 | ipc_connect_to_me(vfs_phone, 0, 0, 0, ®->vfs_phonehash); |
86 | 86 | ||
87 | /* |
87 | /* |
88 | * Allocate piece of address space for PLB. |
88 | * Allocate piece of address space for PLB. |
89 | */ |
89 | */ |
90 | reg->plb_ro = as_get_mappable_page(PLB_SIZE); |
90 | reg->plb_ro = as_get_mappable_page(PLB_SIZE); |
91 | if (!reg->plb_ro) { |
91 | if (!reg->plb_ro) { |
92 | async_wait_for(req, NULL); |
92 | async_wait_for(req, NULL); |
93 | return ENOMEM; |
93 | return ENOMEM; |
94 | } |
94 | } |
95 | 95 | ||
96 | /* |
96 | /* |
97 | * Request sharing the Path Lookup Buffer with VFS. |
97 | * Request sharing the Path Lookup Buffer with VFS. |
98 | */ |
98 | */ |
99 | rc = ipc_share_in_start_0_0(vfs_phone, reg->plb_ro, PLB_SIZE); |
99 | rc = ipc_share_in_start_0_0(vfs_phone, reg->plb_ro, PLB_SIZE); |
100 | if (rc) { |
100 | if (rc) { |
101 | async_wait_for(req, NULL); |
101 | async_wait_for(req, NULL); |
102 | return rc; |
102 | return rc; |
103 | } |
103 | } |
104 | 104 | ||
105 | /* |
105 | /* |
106 | * Pick up the answer for the request to the VFS_REQUEST call. |
106 | * Pick up the answer for the request to the VFS_REQUEST call. |
107 | */ |
107 | */ |
108 | async_wait_for(req, NULL); |
108 | async_wait_for(req, NULL); |
109 | reg->fs_handle = (int) IPC_GET_ARG1(answer); |
109 | reg->fs_handle = (int) IPC_GET_ARG1(answer); |
110 | 110 | ||
111 | /* |
111 | /* |
112 | * Create a connection fibril to handle the callback connection. |
112 | * Create a connection fibril to handle the callback connection. |
113 | */ |
113 | */ |
114 | async_new_connection(reg->vfs_phonehash, 0, NULL, conn); |
114 | async_new_connection(reg->vfs_phonehash, 0, NULL, conn); |
115 | 115 | ||
116 | /* |
116 | /* |
117 | * Tell the async framework that other connections are to be handled by |
117 | * Tell the async framework that other connections are to be handled by |
118 | * the same connection fibril as well. |
118 | * the same connection fibril as well. |
119 | */ |
119 | */ |
120 | async_set_client_connection(conn); |
120 | async_set_client_connection(conn); |
121 | 121 | ||
122 | return IPC_GET_RETVAL(answer); |
122 | return IPC_GET_RETVAL(answer); |
123 | } |
123 | } |
124 | 124 | ||
125 | void fs_node_initialize(fs_node_t *fn) |
125 | void fs_node_initialize(fs_node_t *fn) |
126 | { |
126 | { |
127 | memset(fn, 0, sizeof(fs_node_t)); |
127 | memset(fn, 0, sizeof(fs_node_t)); |
128 | } |
128 | } |
129 | 129 | ||
130 | void libfs_mount(libfs_ops_t *ops, ipc_callid_t rid, ipc_call_t *request) |
130 | void libfs_mount(libfs_ops_t *ops, ipc_callid_t rid, ipc_call_t *request) |
131 | { |
131 | { |
132 | dev_handle_t mp_dev_handle = (dev_handle_t)IPC_GET_ARG1(*request); |
132 | dev_handle_t mp_dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
133 | fs_index_t mp_fs_index = (fs_index_t)IPC_GET_ARG2(*request); |
133 | fs_index_t mp_fs_index = (fs_index_t) IPC_GET_ARG2(*request); |
134 | fs_handle_t mr_fs_handle = (fs_handle_t)IPC_GET_ARG3(*request); |
134 | fs_handle_t mr_fs_handle = (fs_handle_t) IPC_GET_ARG3(*request); |
135 | dev_handle_t mr_dev_handle = (dev_handle_t)IPC_GET_ARG4(*request); |
135 | dev_handle_t mr_dev_handle = (dev_handle_t) IPC_GET_ARG4(*request); |
136 | int res; |
136 | int res; |
137 | ipcarg_t rc; |
137 | ipcarg_t rc; |
138 | 138 | ||
139 | ipc_call_t call; |
139 | ipc_call_t call; |
140 | ipc_callid_t callid; |
140 | ipc_callid_t callid; |
141 | 141 | ||
142 | /* accept the phone */ |
142 | /* accept the phone */ |
143 | callid = async_get_call(&call); |
143 | callid = async_get_call(&call); |
144 | int mountee_phone = (int)IPC_GET_ARG1(call); |
144 | int mountee_phone = (int)IPC_GET_ARG1(call); |
145 | if ((IPC_GET_METHOD(call) != IPC_M_CONNECTION_CLONE) || |
145 | if ((IPC_GET_METHOD(call) != IPC_M_CONNECTION_CLONE) || |
146 | mountee_phone < 0) { |
146 | mountee_phone < 0) { |
147 | ipc_answer_0(callid, EINVAL); |
147 | ipc_answer_0(callid, EINVAL); |
148 | ipc_answer_0(rid, EINVAL); |
148 | ipc_answer_0(rid, EINVAL); |
149 | return; |
149 | return; |
150 | } |
150 | } |
151 | ipc_answer_0(callid, EOK); /* acknowledge the mountee_phone */ |
151 | ipc_answer_0(callid, EOK); /* acknowledge the mountee_phone */ |
152 | 152 | ||
153 | res = ipc_data_write_receive(&callid, NULL); |
153 | res = ipc_data_write_receive(&callid, NULL); |
154 | if (!res) { |
154 | if (!res) { |
155 | ipc_hangup(mountee_phone); |
155 | ipc_hangup(mountee_phone); |
156 | ipc_answer_0(callid, EINVAL); |
156 | ipc_answer_0(callid, EINVAL); |
157 | ipc_answer_0(rid, EINVAL); |
157 | ipc_answer_0(rid, EINVAL); |
158 | return; |
158 | return; |
159 | } |
159 | } |
160 | 160 | ||
161 | fs_node_t *fn = ops->node_get(mp_dev_handle, mp_fs_index); |
161 | fs_node_t *fn = ops->node_get(mp_dev_handle, mp_fs_index); |
162 | if (!fn) { |
162 | if (!fn) { |
163 | ipc_hangup(mountee_phone); |
163 | ipc_hangup(mountee_phone); |
164 | ipc_answer_0(callid, ENOENT); |
164 | ipc_answer_0(callid, ENOENT); |
165 | ipc_answer_0(rid, ENOENT); |
165 | ipc_answer_0(rid, ENOENT); |
166 | return; |
166 | return; |
167 | } |
167 | } |
168 | 168 | ||
169 | if (fn->mp_data.mp_active) { |
169 | if (fn->mp_data.mp_active) { |
170 | ipc_hangup(mountee_phone); |
170 | ipc_hangup(mountee_phone); |
171 | ops->node_put(fn); |
171 | ops->node_put(fn); |
172 | ipc_answer_0(callid, EBUSY); |
172 | ipc_answer_0(callid, EBUSY); |
173 | ipc_answer_0(rid, EBUSY); |
173 | ipc_answer_0(rid, EBUSY); |
174 | return; |
174 | return; |
175 | } |
175 | } |
176 | 176 | ||
177 | rc = async_req_0_0(mountee_phone, IPC_M_CONNECT_ME); |
177 | rc = async_req_0_0(mountee_phone, IPC_M_CONNECT_ME); |
178 | if (rc != 0) { |
178 | if (rc != 0) { |
179 | ipc_hangup(mountee_phone); |
179 | ipc_hangup(mountee_phone); |
180 | ops->node_put(fn); |
180 | ops->node_put(fn); |
181 | ipc_answer_0(callid, rc); |
181 | ipc_answer_0(callid, rc); |
182 | ipc_answer_0(rid, rc); |
182 | ipc_answer_0(rid, rc); |
183 | return; |
183 | return; |
184 | } |
184 | } |
185 | 185 | ||
186 | ipc_call_t answer; |
186 | ipc_call_t answer; |
187 | aid_t msg = async_send_1(mountee_phone, VFS_MOUNTED, mr_dev_handle, |
187 | aid_t msg = async_send_1(mountee_phone, VFS_MOUNTED, mr_dev_handle, |
188 | &answer); |
188 | &answer); |
189 | ipc_forward_fast(callid, mountee_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
189 | ipc_forward_fast(callid, mountee_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
190 | async_wait_for(msg, &rc); |
190 | async_wait_for(msg, &rc); |
191 | 191 | ||
192 | if (rc == EOK) { |
192 | if (rc == EOK) { |
193 | fn->mp_data.mp_active = true; |
193 | fn->mp_data.mp_active = true; |
194 | fn->mp_data.fs_handle = mr_fs_handle; |
194 | fn->mp_data.fs_handle = mr_fs_handle; |
195 | fn->mp_data.dev_handle = mr_dev_handle; |
195 | fn->mp_data.dev_handle = mr_dev_handle; |
196 | fn->mp_data.phone = mountee_phone; |
196 | fn->mp_data.phone = mountee_phone; |
197 | } |
197 | } |
198 | /* |
198 | /* |
199 | * Do not release the FS node so that it stays in memory. |
199 | * Do not release the FS node so that it stays in memory. |
200 | */ |
200 | */ |
201 | ipc_answer_0(rid, rc); |
201 | ipc_answer_0(rid, rc); |
202 | } |
202 | } |
203 | 203 | ||
204 | /** Lookup VFS triplet by name in the file system name space. |
204 | /** Lookup VFS triplet by name in the file system name space. |
205 | * |
205 | * |
206 | * The path passed in the PLB must be in the canonical file system path format |
206 | * The path passed in the PLB must be in the canonical file system path format |
207 | * as returned by the canonify() function. |
207 | * as returned by the canonify() function. |
208 | * |
208 | * |
209 | * @param ops libfs operations structure with function pointers to |
209 | * @param ops libfs operations structure with function pointers to |
210 | * file system implementation |
210 | * file system implementation |
211 | * @param fs_handle File system handle of the file system where to perform |
211 | * @param fs_handle File system handle of the file system where to perform |
212 | * the lookup. |
212 | * the lookup. |
213 | * @param rid Request ID of the VFS_LOOKUP request. |
213 | * @param rid Request ID of the VFS_LOOKUP request. |
214 | * @param request VFS_LOOKUP request data itself. |
214 | * @param request VFS_LOOKUP request data itself. |
215 | */ |
215 | */ |
216 | void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid, |
216 | void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid, |
217 | ipc_call_t *request) |
217 | ipc_call_t *request) |
218 | { |
218 | { |
219 | unsigned first = IPC_GET_ARG1(*request); |
219 | unsigned first = IPC_GET_ARG1(*request); |
220 | unsigned last = IPC_GET_ARG2(*request); |
220 | unsigned last = IPC_GET_ARG2(*request); |
221 | unsigned next = first; |
221 | unsigned next = first; |
222 | dev_handle_t dev_handle = IPC_GET_ARG3(*request); |
222 | dev_handle_t dev_handle = IPC_GET_ARG3(*request); |
223 | int lflag = IPC_GET_ARG4(*request); |
223 | int lflag = IPC_GET_ARG4(*request); |
224 | fs_index_t index = IPC_GET_ARG5(*request); /* when L_LINK specified */ |
224 | fs_index_t index = IPC_GET_ARG5(*request); /* when L_LINK specified */ |
225 | char component[NAME_MAX + 1]; |
225 | char component[NAME_MAX + 1]; |
226 | int len; |
226 | int len; |
227 | 227 | ||
228 | if (last < next) |
228 | if (last < next) |
229 | last += PLB_SIZE; |
229 | last += PLB_SIZE; |
230 | 230 | ||
231 | fs_node_t *par = NULL; |
231 | fs_node_t *par = NULL; |
232 | fs_node_t *cur = ops->root_get(dev_handle); |
232 | fs_node_t *cur = ops->root_get(dev_handle); |
233 | fs_node_t *tmp = NULL; |
233 | fs_node_t *tmp = NULL; |
234 | 234 | ||
235 | if (cur->mp_data.mp_active) { |
235 | if (cur->mp_data.mp_active) { |
236 | ipc_forward_slow(rid, cur->mp_data.phone, VFS_LOOKUP, |
236 | ipc_forward_slow(rid, cur->mp_data.phone, VFS_LOOKUP, |
237 | next, last, cur->mp_data.dev_handle, lflag, index, |
237 | next, last, cur->mp_data.dev_handle, lflag, index, |
238 | IPC_FF_ROUTE_FROM_ME); |
238 | IPC_FF_ROUTE_FROM_ME); |
239 | ops->node_put(cur); |
239 | ops->node_put(cur); |
240 | return; |
240 | return; |
241 | } |
241 | } |
242 | 242 | ||
243 | if (ops->plb_get_char(next) == '/') |
243 | if (ops->plb_get_char(next) == '/') |
244 | next++; /* eat slash */ |
244 | next++; /* eat slash */ |
245 | 245 | ||
246 | while (next <= last && ops->has_children(cur)) { |
246 | while (next <= last && ops->has_children(cur)) { |
247 | /* collect the component */ |
247 | /* collect the component */ |
248 | len = 0; |
248 | len = 0; |
249 | while ((next <= last) && (ops->plb_get_char(next) != '/')) { |
249 | while ((next <= last) && (ops->plb_get_char(next) != '/')) { |
250 | if (len + 1 == NAME_MAX) { |
250 | if (len + 1 == NAME_MAX) { |
251 | /* component length overflow */ |
251 | /* component length overflow */ |
252 | ipc_answer_0(rid, ENAMETOOLONG); |
252 | ipc_answer_0(rid, ENAMETOOLONG); |
253 | goto out; |
253 | goto out; |
254 | } |
254 | } |
255 | component[len++] = ops->plb_get_char(next); |
255 | component[len++] = ops->plb_get_char(next); |
256 | next++; /* process next character */ |
256 | next++; /* process next character */ |
257 | } |
257 | } |
258 | 258 | ||
259 | assert(len); |
259 | assert(len); |
260 | component[len] = '\0'; |
260 | component[len] = '\0'; |
261 | next++; /* eat slash */ |
261 | next++; /* eat slash */ |
262 | 262 | ||
263 | /* match the component */ |
263 | /* match the component */ |
264 | tmp = ops->match(cur, component); |
264 | tmp = ops->match(cur, component); |
265 | if (tmp && tmp->mp_data.mp_active) { |
265 | if (tmp && tmp->mp_data.mp_active) { |
266 | if (next > last) |
266 | if (next > last) |
267 | next = last = first; |
267 | next = last = first; |
268 | else |
268 | else |
269 | next--; |
269 | next--; |
270 | 270 | ||
271 | ipc_forward_slow(rid, tmp->mp_data.phone, VFS_LOOKUP, |
271 | ipc_forward_slow(rid, tmp->mp_data.phone, VFS_LOOKUP, |
272 | next, last, tmp->mp_data.dev_handle, lflag, index, |
272 | next, last, tmp->mp_data.dev_handle, lflag, index, |
273 | IPC_FF_ROUTE_FROM_ME); |
273 | IPC_FF_ROUTE_FROM_ME); |
274 | ops->node_put(cur); |
274 | ops->node_put(cur); |
275 | ops->node_put(tmp); |
275 | ops->node_put(tmp); |
276 | if (par) |
276 | if (par) |
277 | ops->node_put(par); |
277 | ops->node_put(par); |
278 | return; |
278 | return; |
279 | } |
279 | } |
280 | 280 | ||
281 | /* handle miss: match amongst siblings */ |
281 | /* handle miss: match amongst siblings */ |
282 | if (!tmp) { |
282 | if (!tmp) { |
283 | if (next <= last) { |
283 | if (next <= last) { |
284 | /* there are unprocessed components */ |
284 | /* there are unprocessed components */ |
285 | ipc_answer_0(rid, ENOENT); |
285 | ipc_answer_0(rid, ENOENT); |
286 | goto out; |
286 | goto out; |
287 | } |
287 | } |
288 | /* miss in the last component */ |
288 | /* miss in the last component */ |
289 | if (lflag & (L_CREATE | L_LINK)) { |
289 | if (lflag & (L_CREATE | L_LINK)) { |
290 | /* request to create a new link */ |
290 | /* request to create a new link */ |
291 | if (!ops->is_directory(cur)) { |
291 | if (!ops->is_directory(cur)) { |
292 | ipc_answer_0(rid, ENOTDIR); |
292 | ipc_answer_0(rid, ENOTDIR); |
293 | goto out; |
293 | goto out; |
294 | } |
294 | } |
295 | fs_node_t *fn; |
295 | fs_node_t *fn; |
296 | if (lflag & L_CREATE) |
296 | if (lflag & L_CREATE) |
297 | fn = ops->create(dev_handle, lflag); |
297 | fn = ops->create(dev_handle, lflag); |
298 | else |
298 | else |
299 | fn = ops->node_get(dev_handle, |
299 | fn = ops->node_get(dev_handle, |
300 | index); |
300 | index); |
301 | if (fn) { |
301 | if (fn) { |
302 | int rc; |
302 | int rc; |
303 | 303 | ||
304 | rc = ops->link(cur, fn, component); |
304 | rc = ops->link(cur, fn, component); |
305 | if (rc != EOK) { |
305 | if (rc != EOK) { |
306 | if (lflag & L_CREATE) { |
306 | if (lflag & L_CREATE) { |
307 | (void)ops->destroy(fn); |
307 | (void)ops->destroy(fn); |
308 | } |
308 | } |
309 | ipc_answer_0(rid, rc); |
309 | ipc_answer_0(rid, rc); |
310 | } else { |
310 | } else { |
311 | ipc_answer_5(rid, EOK, |
311 | ipc_answer_5(rid, EOK, |
312 | fs_handle, dev_handle, |
312 | fs_handle, dev_handle, |
313 | ops->index_get(fn), |
313 | ops->index_get(fn), |
314 | ops->size_get(fn), |
314 | ops->size_get(fn), |
315 | ops->lnkcnt_get(fn)); |
315 | ops->lnkcnt_get(fn)); |
316 | ops->node_put(fn); |
316 | ops->node_put(fn); |
317 | } |
317 | } |
318 | } else { |
318 | } else { |
319 | ipc_answer_0(rid, ENOSPC); |
319 | ipc_answer_0(rid, ENOSPC); |
320 | } |
320 | } |
321 | goto out; |
321 | goto out; |
322 | } |
322 | } |
323 | ipc_answer_0(rid, ENOENT); |
323 | ipc_answer_0(rid, ENOENT); |
324 | goto out; |
324 | goto out; |
325 | } |
325 | } |
326 | 326 | ||
327 | if (par) |
327 | if (par) |
328 | ops->node_put(par); |
328 | ops->node_put(par); |
329 | 329 | ||
330 | /* descend one level */ |
330 | /* descend one level */ |
331 | par = cur; |
331 | par = cur; |
332 | cur = tmp; |
332 | cur = tmp; |
333 | tmp = NULL; |
333 | tmp = NULL; |
334 | } |
334 | } |
335 | 335 | ||
336 | /* handle miss: excessive components */ |
336 | /* handle miss: excessive components */ |
337 | if (next <= last && !ops->has_children(cur)) { |
337 | if (next <= last && !ops->has_children(cur)) { |
338 | if (lflag & (L_CREATE | L_LINK)) { |
338 | if (lflag & (L_CREATE | L_LINK)) { |
339 | if (!ops->is_directory(cur)) { |
339 | if (!ops->is_directory(cur)) { |
340 | ipc_answer_0(rid, ENOTDIR); |
340 | ipc_answer_0(rid, ENOTDIR); |
341 | goto out; |
341 | goto out; |
342 | } |
342 | } |
343 | 343 | ||
344 | /* collect next component */ |
344 | /* collect next component */ |
345 | len = 0; |
345 | len = 0; |
346 | while (next <= last) { |
346 | while (next <= last) { |
347 | if (ops->plb_get_char(next) == '/') { |
347 | if (ops->plb_get_char(next) == '/') { |
348 | /* more than one component */ |
348 | /* more than one component */ |
349 | ipc_answer_0(rid, ENOENT); |
349 | ipc_answer_0(rid, ENOENT); |
350 | goto out; |
350 | goto out; |
351 | } |
351 | } |
352 | if (len + 1 == NAME_MAX) { |
352 | if (len + 1 == NAME_MAX) { |
353 | /* component length overflow */ |
353 | /* component length overflow */ |
354 | ipc_answer_0(rid, ENAMETOOLONG); |
354 | ipc_answer_0(rid, ENAMETOOLONG); |
355 | goto out; |
355 | goto out; |
356 | } |
356 | } |
357 | component[len++] = ops->plb_get_char(next); |
357 | component[len++] = ops->plb_get_char(next); |
358 | next++; /* process next character */ |
358 | next++; /* process next character */ |
359 | } |
359 | } |
360 | assert(len); |
360 | assert(len); |
361 | component[len] = '\0'; |
361 | component[len] = '\0'; |
362 | 362 | ||
363 | fs_node_t *fn; |
363 | fs_node_t *fn; |
364 | if (lflag & L_CREATE) |
364 | if (lflag & L_CREATE) |
365 | fn = ops->create(dev_handle, lflag); |
365 | fn = ops->create(dev_handle, lflag); |
366 | else |
366 | else |
367 | fn = ops->node_get(dev_handle, index); |
367 | fn = ops->node_get(dev_handle, index); |
368 | if (fn) { |
368 | if (fn) { |
369 | int rc; |
369 | int rc; |
370 | 370 | ||
371 | rc = ops->link(cur, fn, component); |
371 | rc = ops->link(cur, fn, component); |
372 | if (rc != EOK) { |
372 | if (rc != EOK) { |
373 | if (lflag & L_CREATE) |
373 | if (lflag & L_CREATE) |
374 | (void)ops->destroy(fn); |
374 | (void)ops->destroy(fn); |
375 | ipc_answer_0(rid, rc); |
375 | ipc_answer_0(rid, rc); |
376 | } else { |
376 | } else { |
377 | ipc_answer_5(rid, EOK, |
377 | ipc_answer_5(rid, EOK, |
378 | fs_handle, dev_handle, |
378 | fs_handle, dev_handle, |
379 | ops->index_get(fn), |
379 | ops->index_get(fn), |
380 | ops->size_get(fn), |
380 | ops->size_get(fn), |
381 | ops->lnkcnt_get(fn)); |
381 | ops->lnkcnt_get(fn)); |
382 | ops->node_put(fn); |
382 | ops->node_put(fn); |
383 | } |
383 | } |
384 | } else { |
384 | } else { |
385 | ipc_answer_0(rid, ENOSPC); |
385 | ipc_answer_0(rid, ENOSPC); |
386 | } |
386 | } |
387 | goto out; |
387 | goto out; |
388 | } |
388 | } |
389 | ipc_answer_0(rid, ENOENT); |
389 | ipc_answer_0(rid, ENOENT); |
390 | goto out; |
390 | goto out; |
391 | } |
391 | } |
392 | 392 | ||
393 | /* handle hit */ |
393 | /* handle hit */ |
394 | if (lflag & L_UNLINK) { |
394 | if (lflag & L_UNLINK) { |
395 | unsigned old_lnkcnt = ops->lnkcnt_get(cur); |
395 | unsigned old_lnkcnt = ops->lnkcnt_get(cur); |
396 | int res = ops->unlink(par, cur, component); |
396 | int res = ops->unlink(par, cur, component); |
397 | ipc_answer_5(rid, (ipcarg_t)res, fs_handle, dev_handle, |
397 | ipc_answer_5(rid, (ipcarg_t)res, fs_handle, dev_handle, |
398 | ops->index_get(cur), ops->size_get(cur), old_lnkcnt); |
398 | ops->index_get(cur), ops->size_get(cur), old_lnkcnt); |
399 | goto out; |
399 | goto out; |
400 | } |
400 | } |
401 | if (((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) || |
401 | if (((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) || |
402 | (lflag & L_LINK)) { |
402 | (lflag & L_LINK)) { |
403 | ipc_answer_0(rid, EEXIST); |
403 | ipc_answer_0(rid, EEXIST); |
404 | goto out; |
404 | goto out; |
405 | } |
405 | } |
406 | if ((lflag & L_FILE) && (ops->is_directory(cur))) { |
406 | if ((lflag & L_FILE) && (ops->is_directory(cur))) { |
407 | ipc_answer_0(rid, EISDIR); |
407 | ipc_answer_0(rid, EISDIR); |
408 | goto out; |
408 | goto out; |
409 | } |
409 | } |
410 | if ((lflag & L_DIRECTORY) && (ops->is_file(cur))) { |
410 | if ((lflag & L_DIRECTORY) && (ops->is_file(cur))) { |
411 | ipc_answer_0(rid, ENOTDIR); |
411 | ipc_answer_0(rid, ENOTDIR); |
412 | goto out; |
412 | goto out; |
413 | } |
413 | } |
414 | 414 | ||
415 | ipc_answer_5(rid, EOK, fs_handle, dev_handle, ops->index_get(cur), |
415 | ipc_answer_5(rid, EOK, fs_handle, dev_handle, ops->index_get(cur), |
416 | ops->size_get(cur), ops->lnkcnt_get(cur)); |
416 | ops->size_get(cur), ops->lnkcnt_get(cur)); |
417 | 417 | ||
418 | out: |
418 | out: |
419 | if (par) |
419 | if (par) |
420 | ops->node_put(par); |
420 | ops->node_put(par); |
421 | if (cur) |
421 | if (cur) |
422 | ops->node_put(cur); |
422 | ops->node_put(cur); |
423 | if (tmp) |
423 | if (tmp) |
424 | ops->node_put(tmp); |
424 | ops->node_put(tmp); |
425 | } |
425 | } |
426 | 426 | ||
427 | /** @} |
427 | /** @} |
428 | */ |
428 | */ |
429 | 429 |