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| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2008 Jakub Jermar |
2 | * Copyright (c) 2008 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 fs |
29 | /** @addtogroup fs |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | 32 | ||
| 33 | /** |
33 | /** |
| 34 | * @file vfs_ops.c |
34 | * @file vfs_ops.c |
| 35 | * @brief Operations that VFS offers to its clients. |
35 | * @brief Operations that VFS offers to its clients. |
| 36 | */ |
36 | */ |
| 37 | 37 | ||
| 38 | #include "vfs.h" |
38 | #include "vfs.h" |
| 39 | #include <ipc/ipc.h> |
39 | #include <ipc/ipc.h> |
| 40 | #include <async.h> |
40 | #include <async.h> |
| 41 | #include <errno.h> |
41 | #include <errno.h> |
| 42 | #include <stdio.h> |
42 | #include <stdio.h> |
| 43 | #include <stdlib.h> |
43 | #include <stdlib.h> |
| 44 | #include <string.h> |
44 | #include <string.h> |
| 45 | #include <bool.h> |
45 | #include <bool.h> |
| 46 | #include <futex.h> |
46 | #include <futex.h> |
| 47 | #include <fibril_sync.h> |
47 | #include <fibril_sync.h> |
| 48 | #include <adt/list.h> |
48 | #include <adt/list.h> |
| 49 | #include <unistd.h> |
49 | #include <unistd.h> |
| 50 | #include <ctype.h> |
50 | #include <ctype.h> |
| 51 | #include <fcntl.h> |
51 | #include <fcntl.h> |
| 52 | #include <assert.h> |
52 | #include <assert.h> |
| 53 | #include <vfs/canonify.h> |
53 | #include <vfs/canonify.h> |
| 54 | 54 | ||
| 55 | /* Forward declarations of static functions. */ |
55 | /* Forward declarations of static functions. */ |
| 56 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
56 | static int vfs_truncate_internal(fs_handle_t, dev_handle_t, fs_index_t, size_t); |
| 57 | 57 | ||
| 58 | /** Pending mount structure. */ |
58 | /** Pending mount structure. */ |
| 59 | typedef struct { |
59 | typedef struct { |
| 60 | link_t link; |
60 | link_t link; |
| 61 | char *fs_name; /**< File system name */ |
61 | char *fs_name; /**< File system name */ |
| 62 | char *mp; /**< Mount point */ |
62 | char *mp; /**< Mount point */ |
| 63 | char *opts; /**< Mount options. */ |
63 | char *opts; /**< Mount options. */ |
| 64 | ipc_callid_t callid; /**< Call ID waiting for the mount */ |
64 | ipc_callid_t callid; /**< Call ID waiting for the mount */ |
| 65 | ipc_callid_t rid; /**< Request ID */ |
65 | ipc_callid_t rid; /**< Request ID */ |
| 66 | dev_handle_t dev_handle; /**< Device handle */ |
66 | dev_handle_t dev_handle; /**< Device handle */ |
| 67 | } pending_req_t; |
67 | } pending_req_t; |
| 68 | 68 | ||
| 69 | FIBRIL_MUTEX_INITIALIZE(pending_lock); |
69 | FIBRIL_CONDVAR_INITIALIZE(pending_cv); |
| - | 70 | bool pending_new_fs = false; /**< True if a new file system was mounted. */ |
|
| 70 | LIST_INITIALIZE(pending_req); |
71 | LIST_INITIALIZE(pending_req); |
| 71 | 72 | ||
| 72 | /** |
73 | /** |
| 73 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
74 | * This rwlock prevents the race between a triplet-to-VFS-node resolution and a |
| 74 | * concurrent VFS operation which modifies the file system namespace. |
75 | * concurrent VFS operation which modifies the file system namespace. |
| 75 | */ |
76 | */ |
| 76 | FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock); |
77 | FIBRIL_RWLOCK_INITIALIZE(namespace_rwlock); |
| 77 | 78 | ||
| 78 | vfs_pair_t rootfs = { |
79 | vfs_pair_t rootfs = { |
| 79 | .fs_handle = 0, |
80 | .fs_handle = 0, |
| 80 | .dev_handle = 0 |
81 | .dev_handle = 0 |
| 81 | }; |
82 | }; |
| 82 | 83 | ||
| 83 | static void vfs_mount_internal(ipc_callid_t rid, dev_handle_t dev_handle, |
84 | static void vfs_mount_internal(ipc_callid_t rid, dev_handle_t dev_handle, |
| 84 | fs_handle_t fs_handle, char *mp, char *opts) |
85 | fs_handle_t fs_handle, char *mp, char *opts) |
| 85 | { |
86 | { |
| 86 | vfs_lookup_res_t mp_res; |
87 | vfs_lookup_res_t mp_res; |
| 87 | vfs_lookup_res_t mr_res; |
88 | vfs_lookup_res_t mr_res; |
| 88 | vfs_node_t *mp_node = NULL; |
89 | vfs_node_t *mp_node = NULL; |
| 89 | vfs_node_t *mr_node; |
90 | vfs_node_t *mr_node; |
| 90 | fs_index_t rindex; |
91 | fs_index_t rindex; |
| 91 | size_t rsize; |
92 | size_t rsize; |
| 92 | unsigned rlnkcnt; |
93 | unsigned rlnkcnt; |
| 93 | ipcarg_t rc; |
94 | ipcarg_t rc; |
| 94 | int phone; |
95 | int phone; |
| 95 | aid_t msg; |
96 | aid_t msg; |
| 96 | ipc_call_t answer; |
97 | ipc_call_t answer; |
| 97 | 98 | ||
| 98 | /* Resolve the path to the mountpoint. */ |
99 | /* Resolve the path to the mountpoint. */ |
| 99 | fibril_rwlock_write_lock(&namespace_rwlock); |
100 | fibril_rwlock_write_lock(&namespace_rwlock); |
| 100 | if (rootfs.fs_handle) { |
101 | if (rootfs.fs_handle) { |
| 101 | /* We already have the root FS. */ |
102 | /* We already have the root FS. */ |
| 102 | if (str_cmp(mp, "/") == 0) { |
103 | if (str_cmp(mp, "/") == 0) { |
| 103 | /* Trying to mount root FS over root FS */ |
104 | /* Trying to mount root FS over root FS */ |
| 104 | fibril_rwlock_write_unlock(&namespace_rwlock); |
105 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 105 | ipc_answer_0(rid, EBUSY); |
106 | ipc_answer_0(rid, EBUSY); |
| 106 | return; |
107 | return; |
| 107 | } |
108 | } |
| 108 | 109 | ||
| 109 | rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); |
110 | rc = vfs_lookup_internal(mp, L_DIRECTORY, &mp_res, NULL); |
| 110 | if (rc != EOK) { |
111 | if (rc != EOK) { |
| 111 | /* The lookup failed for some reason. */ |
112 | /* The lookup failed for some reason. */ |
| 112 | fibril_rwlock_write_unlock(&namespace_rwlock); |
113 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 113 | ipc_answer_0(rid, rc); |
114 | ipc_answer_0(rid, rc); |
| 114 | return; |
115 | return; |
| 115 | } |
116 | } |
| 116 | 117 | ||
| 117 | mp_node = vfs_node_get(&mp_res); |
118 | mp_node = vfs_node_get(&mp_res); |
| 118 | if (!mp_node) { |
119 | if (!mp_node) { |
| 119 | fibril_rwlock_write_unlock(&namespace_rwlock); |
120 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 120 | ipc_answer_0(rid, ENOMEM); |
121 | ipc_answer_0(rid, ENOMEM); |
| 121 | return; |
122 | return; |
| 122 | } |
123 | } |
| 123 | 124 | ||
| 124 | /* |
125 | /* |
| 125 | * Now we hold a reference to mp_node. |
126 | * Now we hold a reference to mp_node. |
| 126 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
127 | * It will be dropped upon the corresponding VFS_UNMOUNT. |
| 127 | * This prevents the mount point from being deleted. |
128 | * This prevents the mount point from being deleted. |
| 128 | */ |
129 | */ |
| 129 | } else { |
130 | } else { |
| 130 | /* We still don't have the root file system mounted. */ |
131 | /* We still don't have the root file system mounted. */ |
| 131 | if (str_cmp(mp, "/") == 0) { |
132 | if (str_cmp(mp, "/") == 0) { |
| 132 | /* |
133 | /* |
| 133 | * For this simple, but important case, |
134 | * For this simple, but important case, |
| 134 | * we are almost done. |
135 | * we are almost done. |
| 135 | */ |
136 | */ |
| 136 | 137 | ||
| 137 | /* Tell the mountee that it is being mounted. */ |
138 | /* Tell the mountee that it is being mounted. */ |
| 138 | phone = vfs_grab_phone(fs_handle); |
139 | phone = vfs_grab_phone(fs_handle); |
| 139 | msg = async_send_1(phone, VFS_MOUNTED, |
140 | msg = async_send_1(phone, VFS_MOUNTED, |
| 140 | (ipcarg_t) dev_handle, &answer); |
141 | (ipcarg_t) dev_handle, &answer); |
| 141 | /* send the mount options */ |
142 | /* send the mount options */ |
| 142 | rc = ipc_data_write_start(phone, (void *)opts, |
143 | rc = ipc_data_write_start(phone, (void *)opts, |
| 143 | str_size(opts)); |
144 | str_size(opts)); |
| 144 | if (rc != EOK) { |
145 | if (rc != EOK) { |
| 145 | vfs_release_phone(phone); |
146 | vfs_release_phone(phone); |
| 146 | async_wait_for(msg, NULL); |
147 | async_wait_for(msg, NULL); |
| 147 | fibril_rwlock_write_unlock(&namespace_rwlock); |
148 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 148 | ipc_answer_0(rid, rc); |
149 | ipc_answer_0(rid, rc); |
| 149 | return; |
150 | return; |
| 150 | } |
151 | } |
| 151 | vfs_release_phone(phone); |
152 | vfs_release_phone(phone); |
| 152 | async_wait_for(msg, &rc); |
153 | async_wait_for(msg, &rc); |
| 153 | 154 | ||
| 154 | if (rc != EOK) { |
155 | if (rc != EOK) { |
| 155 | fibril_rwlock_write_unlock(&namespace_rwlock); |
156 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 156 | ipc_answer_0(rid, rc); |
157 | ipc_answer_0(rid, rc); |
| 157 | return; |
158 | return; |
| 158 | } |
159 | } |
| 159 | 160 | ||
| 160 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
161 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
| 161 | rsize = (size_t) IPC_GET_ARG2(answer); |
162 | rsize = (size_t) IPC_GET_ARG2(answer); |
| 162 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
163 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
| 163 | 164 | ||
| 164 | mr_res.triplet.fs_handle = fs_handle; |
165 | mr_res.triplet.fs_handle = fs_handle; |
| 165 | mr_res.triplet.dev_handle = dev_handle; |
166 | mr_res.triplet.dev_handle = dev_handle; |
| 166 | mr_res.triplet.index = rindex; |
167 | mr_res.triplet.index = rindex; |
| 167 | mr_res.size = rsize; |
168 | mr_res.size = rsize; |
| 168 | mr_res.lnkcnt = rlnkcnt; |
169 | mr_res.lnkcnt = rlnkcnt; |
| 169 | mr_res.type = VFS_NODE_DIRECTORY; |
170 | mr_res.type = VFS_NODE_DIRECTORY; |
| 170 | 171 | ||
| 171 | rootfs.fs_handle = fs_handle; |
172 | rootfs.fs_handle = fs_handle; |
| 172 | rootfs.dev_handle = dev_handle; |
173 | rootfs.dev_handle = dev_handle; |
| 173 | 174 | ||
| 174 | /* Add reference to the mounted root. */ |
175 | /* Add reference to the mounted root. */ |
| 175 | mr_node = vfs_node_get(&mr_res); |
176 | mr_node = vfs_node_get(&mr_res); |
| 176 | assert(mr_node); |
177 | assert(mr_node); |
| 177 | 178 | ||
| 178 | fibril_rwlock_write_unlock(&namespace_rwlock); |
179 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 179 | ipc_answer_0(rid, rc); |
180 | ipc_answer_0(rid, rc); |
| 180 | return; |
181 | return; |
| 181 | } else { |
182 | } else { |
| 182 | /* |
183 | /* |
| 183 | * We can't resolve this without the root filesystem |
184 | * We can't resolve this without the root filesystem |
| 184 | * being mounted first. |
185 | * being mounted first. |
| 185 | */ |
186 | */ |
| 186 | fibril_rwlock_write_unlock(&namespace_rwlock); |
187 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 187 | ipc_answer_0(rid, ENOENT); |
188 | ipc_answer_0(rid, ENOENT); |
| 188 | return; |
189 | return; |
| 189 | } |
190 | } |
| 190 | } |
191 | } |
| 191 | 192 | ||
| 192 | /* |
193 | /* |
| 193 | * At this point, we have all necessary pieces: file system and device |
194 | * At this point, we have all necessary pieces: file system and device |
| 194 | * handles, and we know the mount point VFS node. |
195 | * handles, and we know the mount point VFS node. |
| 195 | */ |
196 | */ |
| 196 | 197 | ||
| 197 | int mountee_phone = vfs_grab_phone(fs_handle); |
198 | int mountee_phone = vfs_grab_phone(fs_handle); |
| 198 | assert(mountee_phone >= 0); |
199 | assert(mountee_phone >= 0); |
| 199 | vfs_release_phone(mountee_phone); |
200 | vfs_release_phone(mountee_phone); |
| 200 | 201 | ||
| 201 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
202 | phone = vfs_grab_phone(mp_res.triplet.fs_handle); |
| 202 | msg = async_send_4(phone, VFS_MOUNT, |
203 | msg = async_send_4(phone, VFS_MOUNT, |
| 203 | (ipcarg_t) mp_res.triplet.dev_handle, |
204 | (ipcarg_t) mp_res.triplet.dev_handle, |
| 204 | (ipcarg_t) mp_res.triplet.index, |
205 | (ipcarg_t) mp_res.triplet.index, |
| 205 | (ipcarg_t) fs_handle, |
206 | (ipcarg_t) fs_handle, |
| 206 | (ipcarg_t) dev_handle, &answer); |
207 | (ipcarg_t) dev_handle, &answer); |
| 207 | 208 | ||
| 208 | /* send connection */ |
209 | /* send connection */ |
| 209 | rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone); |
210 | rc = async_req_1_0(phone, IPC_M_CONNECTION_CLONE, mountee_phone); |
| 210 | if (rc != EOK) { |
211 | if (rc != EOK) { |
| 211 | vfs_release_phone(phone); |
212 | vfs_release_phone(phone); |
| 212 | async_wait_for(msg, NULL); |
213 | async_wait_for(msg, NULL); |
| 213 | /* Mount failed, drop reference to mp_node. */ |
214 | /* Mount failed, drop reference to mp_node. */ |
| 214 | if (mp_node) |
215 | if (mp_node) |
| 215 | vfs_node_put(mp_node); |
216 | vfs_node_put(mp_node); |
| 216 | ipc_answer_0(rid, rc); |
217 | ipc_answer_0(rid, rc); |
| 217 | fibril_rwlock_write_unlock(&namespace_rwlock); |
218 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 218 | return; |
219 | return; |
| 219 | } |
220 | } |
| 220 | 221 | ||
| 221 | /* send the mount options */ |
222 | /* send the mount options */ |
| 222 | rc = ipc_data_write_start(phone, (void *)opts, str_size(opts)); |
223 | rc = ipc_data_write_start(phone, (void *)opts, str_size(opts)); |
| 223 | if (rc != EOK) { |
224 | if (rc != EOK) { |
| 224 | vfs_release_phone(phone); |
225 | vfs_release_phone(phone); |
| 225 | async_wait_for(msg, NULL); |
226 | async_wait_for(msg, NULL); |
| 226 | /* Mount failed, drop reference to mp_node. */ |
227 | /* Mount failed, drop reference to mp_node. */ |
| 227 | if (mp_node) |
228 | if (mp_node) |
| 228 | vfs_node_put(mp_node); |
229 | vfs_node_put(mp_node); |
| 229 | fibril_rwlock_write_unlock(&namespace_rwlock); |
230 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 230 | ipc_answer_0(rid, rc); |
231 | ipc_answer_0(rid, rc); |
| 231 | return; |
232 | return; |
| 232 | } |
233 | } |
| 233 | vfs_release_phone(phone); |
234 | vfs_release_phone(phone); |
| 234 | async_wait_for(msg, &rc); |
235 | async_wait_for(msg, &rc); |
| 235 | 236 | ||
| 236 | if (rc == EOK) { |
237 | if (rc == EOK) { |
| 237 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
238 | rindex = (fs_index_t) IPC_GET_ARG1(answer); |
| 238 | rsize = (size_t) IPC_GET_ARG2(answer); |
239 | rsize = (size_t) IPC_GET_ARG2(answer); |
| 239 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
240 | rlnkcnt = (unsigned) IPC_GET_ARG3(answer); |
| 240 | 241 | ||
| 241 | mr_res.triplet.fs_handle = fs_handle; |
242 | mr_res.triplet.fs_handle = fs_handle; |
| 242 | mr_res.triplet.dev_handle = dev_handle; |
243 | mr_res.triplet.dev_handle = dev_handle; |
| 243 | mr_res.triplet.index = rindex; |
244 | mr_res.triplet.index = rindex; |
| 244 | mr_res.size = rsize; |
245 | mr_res.size = rsize; |
| 245 | mr_res.lnkcnt = rlnkcnt; |
246 | mr_res.lnkcnt = rlnkcnt; |
| 246 | mr_res.type = VFS_NODE_DIRECTORY; |
247 | mr_res.type = VFS_NODE_DIRECTORY; |
| 247 | 248 | ||
| 248 | /* Add reference to the mounted root. */ |
249 | /* Add reference to the mounted root. */ |
| 249 | mr_node = vfs_node_get(&mr_res); |
250 | mr_node = vfs_node_get(&mr_res); |
| 250 | assert(mr_node); |
251 | assert(mr_node); |
| 251 | } else { |
252 | } else { |
| 252 | /* Mount failed, drop reference to mp_node. */ |
253 | /* Mount failed, drop reference to mp_node. */ |
| 253 | if (mp_node) |
254 | if (mp_node) |
| 254 | vfs_node_put(mp_node); |
255 | vfs_node_put(mp_node); |
| 255 | } |
256 | } |
| 256 | 257 | ||
| 257 | ipc_answer_0(rid, rc); |
258 | ipc_answer_0(rid, rc); |
| 258 | fibril_rwlock_write_unlock(&namespace_rwlock); |
259 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 259 | } |
260 | } |
| 260 | 261 | ||
| 261 | /** Process pending mount requests */ |
262 | /** Process pending mount requests */ |
| 262 | void vfs_process_pending_mount(void) |
263 | void vfs_process_pending_mount(void) |
| 263 | { |
264 | { |
| 264 | link_t *cur; |
265 | link_t *cur; |
| 265 | 266 | ||
| 266 | loop: |
267 | while (true) { |
| 267 | fibril_mutex_lock(&pending_lock); |
268 | fibril_mutex_lock(&fs_head_lock); |
| - | 269 | while (!pending_new_fs) |
|
| - | 270 | fibril_condvar_wait(&pending_cv, &fs_head_lock); |
|
| - | 271 | rescan: |
|
| 268 | for (cur = pending_req.next; cur != &pending_req; cur = cur->next) { |
272 | for (cur = pending_req.next; cur != &pending_req; |
| - | 273 | cur = cur->next) { |
|
| 269 | pending_req_t *pr = list_get_instance(cur, pending_req_t, link); |
274 | pending_req_t *pr = list_get_instance(cur, |
| 270 | - | ||
| - | 275 | pending_req_t, link); |
|
| 271 | fs_handle_t fs_handle = fs_name_to_handle(pr->fs_name, true); |
276 | fs_handle_t fs_handle = fs_name_to_handle(pr->fs_name, |
| - | 277 | false); |
|
| 272 | if (!fs_handle) |
278 | if (!fs_handle) |
| 273 | continue; |
279 | continue; |
| 274 | 280 | ||
| 275 | /* Acknowledge that we know fs_name. */ |
281 | /* Acknowledge that we know fs_name. */ |
| 276 | ipc_answer_0(pr->callid, EOK); |
282 | ipc_answer_0(pr->callid, EOK); |
| 277 | 283 | ||
| - | 284 | list_remove(cur); |
|
| - | 285 | fibril_mutex_unlock(&fs_head_lock); |
|
| - | 286 | ||
| 278 | /* Do the mount */ |
287 | /* Do the mount */ |
| 279 | vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, pr->mp, |
288 | vfs_mount_internal(pr->rid, pr->dev_handle, fs_handle, |
| - | 289 | pr->mp, pr->opts); |
|
| - | 290 | ||
| - | 291 | free(pr->fs_name); |
|
| - | 292 | free(pr->mp); |
|
| 280 | pr->opts); |
293 | free(pr->opts); |
| - | 294 | free(pr); |
|
| 281 | 295 | ||
| 282 | free(pr->fs_name); |
296 | fibril_mutex_lock(&fs_head_lock); |
| 283 | free(pr->mp); |
297 | goto rescan; |
| 284 | free(pr->opts); |
298 | } |
| 285 | list_remove(cur); |
299 | pending_new_fs = false; |
| 286 | free(pr); |
- | |
| 287 | fibril_mutex_unlock(&pending_lock); |
300 | fibril_mutex_unlock(&fs_head_lock); |
| 288 | fibril_yield(); |
- | |
| 289 | goto loop; |
- | |
| 290 | } |
301 | } |
| 291 | fibril_mutex_unlock(&pending_lock); |
- | |
| 292 | } |
302 | } |
| 293 | 303 | ||
| 294 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
304 | void vfs_mount(ipc_callid_t rid, ipc_call_t *request) |
| 295 | { |
305 | { |
| 296 | /* |
306 | /* |
| 297 | * We expect the library to do the device-name to device-handle |
307 | * We expect the library to do the device-name to device-handle |
| 298 | * translation for us, thus the device handle will arrive as ARG1 |
308 | * translation for us, thus the device handle will arrive as ARG1 |
| 299 | * in the request. |
309 | * in the request. |
| 300 | */ |
310 | */ |
| 301 | dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
311 | dev_handle_t dev_handle = (dev_handle_t) IPC_GET_ARG1(*request); |
| 302 | 312 | ||
| 303 | /* |
313 | /* |
| 304 | * Mount flags are passed as ARG2. |
314 | * Mount flags are passed as ARG2. |
| 305 | */ |
315 | */ |
| 306 | unsigned int flags = (unsigned int) IPC_GET_ARG2(*request); |
316 | unsigned int flags = (unsigned int) IPC_GET_ARG2(*request); |
| 307 | 317 | ||
| 308 | /* |
318 | /* |
| 309 | * For now, don't make use of ARG3, but it can be used to |
319 | * For now, don't make use of ARG3, but it can be used to |
| 310 | * carry mount options in the future. |
320 | * carry mount options in the future. |
| 311 | */ |
321 | */ |
| 312 | 322 | ||
| 313 | /* We want the client to send us the mount point. */ |
323 | /* We want the client to send us the mount point. */ |
| 314 | ipc_callid_t callid; |
324 | ipc_callid_t callid; |
| 315 | size_t size; |
325 | size_t size; |
| 316 | if (!ipc_data_write_receive(&callid, &size)) { |
326 | if (!ipc_data_write_receive(&callid, &size)) { |
| 317 | ipc_answer_0(callid, EINVAL); |
327 | ipc_answer_0(callid, EINVAL); |
| 318 | ipc_answer_0(rid, EINVAL); |
328 | ipc_answer_0(rid, EINVAL); |
| 319 | return; |
329 | return; |
| 320 | } |
330 | } |
| 321 | 331 | ||
| 322 | /* Check whether size is reasonable wrt. the mount point. */ |
332 | /* Check whether size is reasonable wrt. the mount point. */ |
| 323 | if ((size < 1) || (size > MAX_PATH_LEN)) { |
333 | if ((size < 1) || (size > MAX_PATH_LEN)) { |
| 324 | ipc_answer_0(callid, EINVAL); |
334 | ipc_answer_0(callid, EINVAL); |
| 325 | ipc_answer_0(rid, EINVAL); |
335 | ipc_answer_0(rid, EINVAL); |
| 326 | return; |
336 | return; |
| 327 | } |
337 | } |
| 328 | 338 | ||
| 329 | /* Allocate buffer for the mount point data being received. */ |
339 | /* Allocate buffer for the mount point data being received. */ |
| 330 | char *mp = malloc(size + 1); |
340 | char *mp = malloc(size + 1); |
| 331 | if (!mp) { |
341 | if (!mp) { |
| 332 | ipc_answer_0(callid, ENOMEM); |
342 | ipc_answer_0(callid, ENOMEM); |
| 333 | ipc_answer_0(rid, ENOMEM); |
343 | ipc_answer_0(rid, ENOMEM); |
| 334 | return; |
344 | return; |
| 335 | } |
345 | } |
| 336 | 346 | ||
| 337 | /* Deliver the mount point. */ |
347 | /* Deliver the mount point. */ |
| 338 | ipcarg_t retval = ipc_data_write_finalize(callid, mp, size); |
348 | ipcarg_t retval = ipc_data_write_finalize(callid, mp, size); |
| 339 | if (retval != EOK) { |
349 | if (retval != EOK) { |
| 340 | ipc_answer_0(rid, retval); |
350 | ipc_answer_0(rid, retval); |
| 341 | free(mp); |
351 | free(mp); |
| 342 | return; |
352 | return; |
| 343 | } |
353 | } |
| 344 | mp[size] = '\0'; |
354 | mp[size] = '\0'; |
| 345 | 355 | ||
| 346 | /* Now we expect to receive the mount options. */ |
356 | /* Now we expect to receive the mount options. */ |
| 347 | if (!ipc_data_write_receive(&callid, &size)) { |
357 | if (!ipc_data_write_receive(&callid, &size)) { |
| 348 | ipc_answer_0(callid, EINVAL); |
358 | ipc_answer_0(callid, EINVAL); |
| 349 | ipc_answer_0(rid, EINVAL); |
359 | ipc_answer_0(rid, EINVAL); |
| 350 | free(mp); |
360 | free(mp); |
| 351 | return; |
361 | return; |
| 352 | } |
362 | } |
| 353 | 363 | ||
| 354 | /* Check the offered options size. */ |
364 | /* Check the offered options size. */ |
| 355 | if (size < 0 || size > MAX_MNTOPTS_LEN) { |
365 | if (size < 0 || size > MAX_MNTOPTS_LEN) { |
| 356 | ipc_answer_0(callid, EINVAL); |
366 | ipc_answer_0(callid, EINVAL); |
| 357 | ipc_answer_0(rid, EINVAL); |
367 | ipc_answer_0(rid, EINVAL); |
| 358 | free(mp); |
368 | free(mp); |
| 359 | return; |
369 | return; |
| 360 | } |
370 | } |
| 361 | 371 | ||
| 362 | /* Allocate buffer for the mount options. */ |
372 | /* Allocate buffer for the mount options. */ |
| 363 | char *opts = (char *) malloc(size + 1); |
373 | char *opts = (char *) malloc(size + 1); |
| 364 | if (!opts) { |
374 | if (!opts) { |
| 365 | ipc_answer_0(callid, ENOMEM); |
375 | ipc_answer_0(callid, ENOMEM); |
| 366 | ipc_answer_0(rid, ENOMEM); |
376 | ipc_answer_0(rid, ENOMEM); |
| 367 | free(mp); |
377 | free(mp); |
| 368 | return; |
378 | return; |
| 369 | } |
379 | } |
| 370 | 380 | ||
| 371 | /* Deliver the mount options. */ |
381 | /* Deliver the mount options. */ |
| 372 | retval = ipc_data_write_finalize(callid, opts, size); |
382 | retval = ipc_data_write_finalize(callid, opts, size); |
| 373 | if (retval != EOK) { |
383 | if (retval != EOK) { |
| 374 | ipc_answer_0(rid, retval); |
384 | ipc_answer_0(rid, retval); |
| 375 | free(mp); |
385 | free(mp); |
| 376 | free(opts); |
386 | free(opts); |
| 377 | return; |
387 | return; |
| 378 | } |
388 | } |
| 379 | opts[size] = '\0'; |
389 | opts[size] = '\0'; |
| 380 | 390 | ||
| 381 | /* |
391 | /* |
| 382 | * Now, we expect the client to send us data with the name of the file |
392 | * Now, we expect the client to send us data with the name of the file |
| 383 | * system. |
393 | * system. |
| 384 | */ |
394 | */ |
| 385 | if (!ipc_data_write_receive(&callid, &size)) { |
395 | if (!ipc_data_write_receive(&callid, &size)) { |
| 386 | ipc_answer_0(callid, EINVAL); |
396 | ipc_answer_0(callid, EINVAL); |
| 387 | ipc_answer_0(rid, EINVAL); |
397 | ipc_answer_0(rid, EINVAL); |
| 388 | free(mp); |
398 | free(mp); |
| 389 | free(opts); |
399 | free(opts); |
| 390 | return; |
400 | return; |
| 391 | } |
401 | } |
| 392 | 402 | ||
| 393 | /* |
403 | /* |
| 394 | * Don't receive more than is necessary for storing a full file system |
404 | * Don't receive more than is necessary for storing a full file system |
| 395 | * name. |
405 | * name. |
| 396 | */ |
406 | */ |
| 397 | if ((size < 1) || (size > FS_NAME_MAXLEN)) { |
407 | if ((size < 1) || (size > FS_NAME_MAXLEN)) { |
| 398 | ipc_answer_0(callid, EINVAL); |
408 | ipc_answer_0(callid, EINVAL); |
| 399 | ipc_answer_0(rid, EINVAL); |
409 | ipc_answer_0(rid, EINVAL); |
| 400 | free(mp); |
410 | free(mp); |
| 401 | free(opts); |
411 | free(opts); |
| 402 | return; |
412 | return; |
| 403 | } |
413 | } |
| 404 | 414 | ||
| 405 | /* |
415 | /* |
| 406 | * Allocate buffer for file system name. |
416 | * Allocate buffer for file system name. |
| 407 | */ |
417 | */ |
| 408 | char *fs_name = (char *) malloc(size + 1); |
418 | char *fs_name = (char *) malloc(size + 1); |
| 409 | if (fs_name == NULL) { |
419 | if (fs_name == NULL) { |
| 410 | ipc_answer_0(callid, ENOMEM); |
420 | ipc_answer_0(callid, ENOMEM); |
| 411 | ipc_answer_0(rid, ENOMEM); |
421 | ipc_answer_0(rid, ENOMEM); |
| 412 | free(mp); |
422 | free(mp); |
| 413 | free(opts); |
423 | free(opts); |
| 414 | return; |
424 | return; |
| 415 | } |
425 | } |
| 416 | 426 | ||
| 417 | /* Deliver the file system name. */ |
427 | /* Deliver the file system name. */ |
| 418 | retval = ipc_data_write_finalize(callid, fs_name, size); |
428 | retval = ipc_data_write_finalize(callid, fs_name, size); |
| 419 | if (retval != EOK) { |
429 | if (retval != EOK) { |
| 420 | ipc_answer_0(rid, retval); |
430 | ipc_answer_0(rid, retval); |
| 421 | free(mp); |
431 | free(mp); |
| 422 | free(opts); |
432 | free(opts); |
| 423 | free(fs_name); |
433 | free(fs_name); |
| 424 | return; |
434 | return; |
| 425 | } |
435 | } |
| 426 | fs_name[size] = '\0'; |
436 | fs_name[size] = '\0'; |
| 427 | 437 | ||
| 428 | /* |
438 | /* |
| 429 | * Wait for IPC_M_PING so that we can return an error if we don't know |
439 | * Wait for IPC_M_PING so that we can return an error if we don't know |
| 430 | * fs_name. |
440 | * fs_name. |
| 431 | */ |
441 | */ |
| 432 | ipc_call_t data; |
442 | ipc_call_t data; |
| 433 | callid = async_get_call(&data); |
443 | callid = async_get_call(&data); |
| 434 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
444 | if (IPC_GET_METHOD(data) != IPC_M_PING) { |
| 435 | ipc_answer_0(callid, ENOTSUP); |
445 | ipc_answer_0(callid, ENOTSUP); |
| 436 | ipc_answer_0(rid, ENOTSUP); |
446 | ipc_answer_0(rid, ENOTSUP); |
| 437 | free(mp); |
447 | free(mp); |
| 438 | free(opts); |
448 | free(opts); |
| 439 | free(fs_name); |
449 | free(fs_name); |
| 440 | return; |
450 | return; |
| 441 | } |
451 | } |
| 442 | 452 | ||
| 443 | /* |
453 | /* |
| 444 | * Check if we know a file system with the same name as is in fs_name. |
454 | * Check if we know a file system with the same name as is in fs_name. |
| 445 | * This will also give us its file system handle. |
455 | * This will also give us its file system handle. |
| 446 | */ |
456 | */ |
| - | 457 | fibril_mutex_lock(&fs_head_lock); |
|
| 447 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, true); |
458 | fs_handle_t fs_handle = fs_name_to_handle(fs_name, false); |
| 448 | if (!fs_handle) { |
459 | if (!fs_handle) { |
| 449 | if (flags & IPC_FLAG_BLOCKING) { |
460 | if (flags & IPC_FLAG_BLOCKING) { |
| 450 | pending_req_t *pr; |
461 | pending_req_t *pr; |
| 451 | 462 | ||
| 452 | /* Blocking mount, add to pending list */ |
463 | /* Blocking mount, add to pending list */ |
| 453 | pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
464 | pr = (pending_req_t *) malloc(sizeof(pending_req_t)); |
| 454 | if (!pr) { |
465 | if (!pr) { |
| - | 466 | fibril_mutex_unlock(&fs_head_lock); |
|
| 455 | ipc_answer_0(callid, ENOMEM); |
467 | ipc_answer_0(callid, ENOMEM); |
| 456 | ipc_answer_0(rid, ENOMEM); |
468 | ipc_answer_0(rid, ENOMEM); |
| 457 | free(mp); |
469 | free(mp); |
| 458 | free(fs_name); |
470 | free(fs_name); |
| 459 | free(opts); |
471 | free(opts); |
| 460 | return; |
472 | return; |
| 461 | } |
473 | } |
| 462 | 474 | ||
| 463 | pr->fs_name = fs_name; |
475 | pr->fs_name = fs_name; |
| 464 | pr->mp = mp; |
476 | pr->mp = mp; |
| 465 | pr->opts = opts; |
477 | pr->opts = opts; |
| 466 | pr->callid = callid; |
478 | pr->callid = callid; |
| 467 | pr->rid = rid; |
479 | pr->rid = rid; |
| 468 | pr->dev_handle = dev_handle; |
480 | pr->dev_handle = dev_handle; |
| 469 | link_initialize(&pr->link); |
481 | link_initialize(&pr->link); |
| 470 | fibril_mutex_lock(&pending_lock); |
- | |
| 471 | list_append(&pr->link, &pending_req); |
482 | list_append(&pr->link, &pending_req); |
| 472 | fibril_mutex_unlock(&pending_lock); |
483 | fibril_mutex_unlock(&fs_head_lock); |
| 473 | return; |
484 | return; |
| 474 | } |
485 | } |
| 475 | 486 | ||
| - | 487 | fibril_mutex_unlock(&fs_head_lock); |
|
| 476 | ipc_answer_0(callid, ENOENT); |
488 | ipc_answer_0(callid, ENOENT); |
| 477 | ipc_answer_0(rid, ENOENT); |
489 | ipc_answer_0(rid, ENOENT); |
| 478 | free(mp); |
490 | free(mp); |
| 479 | free(fs_name); |
491 | free(fs_name); |
| 480 | free(opts); |
492 | free(opts); |
| 481 | return; |
493 | return; |
| 482 | } |
494 | } |
| - | 495 | fibril_mutex_unlock(&fs_head_lock); |
|
| 483 | 496 | ||
| 484 | /* Acknowledge that we know fs_name. */ |
497 | /* Acknowledge that we know fs_name. */ |
| 485 | ipc_answer_0(callid, EOK); |
498 | ipc_answer_0(callid, EOK); |
| 486 | 499 | ||
| 487 | /* Do the mount */ |
500 | /* Do the mount */ |
| 488 | vfs_mount_internal(rid, dev_handle, fs_handle, mp, opts); |
501 | vfs_mount_internal(rid, dev_handle, fs_handle, mp, opts); |
| 489 | free(mp); |
502 | free(mp); |
| 490 | free(fs_name); |
503 | free(fs_name); |
| 491 | free(opts); |
504 | free(opts); |
| 492 | } |
505 | } |
| 493 | 506 | ||
| 494 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
507 | void vfs_open(ipc_callid_t rid, ipc_call_t *request) |
| 495 | { |
508 | { |
| 496 | if (!vfs_files_init()) { |
509 | if (!vfs_files_init()) { |
| 497 | ipc_answer_0(rid, ENOMEM); |
510 | ipc_answer_0(rid, ENOMEM); |
| 498 | return; |
511 | return; |
| 499 | } |
512 | } |
| 500 | 513 | ||
| 501 | /* |
514 | /* |
| 502 | * The POSIX interface is open(path, oflag, mode). |
515 | * The POSIX interface is open(path, oflag, mode). |
| 503 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
516 | * We can receive oflags and mode along with the VFS_OPEN call; the path |
| 504 | * will need to arrive in another call. |
517 | * will need to arrive in another call. |
| 505 | * |
518 | * |
| 506 | * We also receive one private, non-POSIX set of flags called lflag |
519 | * We also receive one private, non-POSIX set of flags called lflag |
| 507 | * used to pass information to vfs_lookup_internal(). |
520 | * used to pass information to vfs_lookup_internal(). |
| 508 | */ |
521 | */ |
| 509 | int lflag = IPC_GET_ARG1(*request); |
522 | int lflag = IPC_GET_ARG1(*request); |
| 510 | int oflag = IPC_GET_ARG2(*request); |
523 | int oflag = IPC_GET_ARG2(*request); |
| 511 | int mode = IPC_GET_ARG3(*request); |
524 | int mode = IPC_GET_ARG3(*request); |
| 512 | size_t len; |
525 | size_t len; |
| 513 | 526 | ||
| 514 | /* |
527 | /* |
| 515 | * Make sure that we are called with exactly one of L_FILE and |
528 | * Make sure that we are called with exactly one of L_FILE and |
| 516 | * L_DIRECTORY. Make sure that the user does not pass L_OPEN. |
529 | * L_DIRECTORY. Make sure that the user does not pass L_OPEN. |
| 517 | */ |
530 | */ |
| 518 | if (((lflag & (L_FILE | L_DIRECTORY)) == 0) || |
531 | if (((lflag & (L_FILE | L_DIRECTORY)) == 0) || |
| 519 | ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) || |
532 | ((lflag & (L_FILE | L_DIRECTORY)) == (L_FILE | L_DIRECTORY)) || |
| 520 | ((lflag & L_OPEN) != 0)) { |
533 | ((lflag & L_OPEN) != 0)) { |
| 521 | ipc_answer_0(rid, EINVAL); |
534 | ipc_answer_0(rid, EINVAL); |
| 522 | return; |
535 | return; |
| 523 | } |
536 | } |
| 524 | 537 | ||
| 525 | if (oflag & O_CREAT) |
538 | if (oflag & O_CREAT) |
| 526 | lflag |= L_CREATE; |
539 | lflag |= L_CREATE; |
| 527 | if (oflag & O_EXCL) |
540 | if (oflag & O_EXCL) |
| 528 | lflag |= L_EXCLUSIVE; |
541 | lflag |= L_EXCLUSIVE; |
| 529 | 542 | ||
| 530 | ipc_callid_t callid; |
543 | ipc_callid_t callid; |
| 531 | if (!ipc_data_write_receive(&callid, &len)) { |
544 | if (!ipc_data_write_receive(&callid, &len)) { |
| 532 | ipc_answer_0(callid, EINVAL); |
545 | ipc_answer_0(callid, EINVAL); |
| 533 | ipc_answer_0(rid, EINVAL); |
546 | ipc_answer_0(rid, EINVAL); |
| 534 | return; |
547 | return; |
| 535 | } |
548 | } |
| 536 | 549 | ||
| 537 | char *path = malloc(len + 1); |
550 | char *path = malloc(len + 1); |
| 538 | if (!path) { |
551 | if (!path) { |
| 539 | ipc_answer_0(callid, ENOMEM); |
552 | ipc_answer_0(callid, ENOMEM); |
| 540 | ipc_answer_0(rid, ENOMEM); |
553 | ipc_answer_0(rid, ENOMEM); |
| 541 | return; |
554 | return; |
| 542 | } |
555 | } |
| 543 | 556 | ||
| 544 | int rc; |
557 | int rc; |
| 545 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
558 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
| 546 | ipc_answer_0(rid, rc); |
559 | ipc_answer_0(rid, rc); |
| 547 | free(path); |
560 | free(path); |
| 548 | return; |
561 | return; |
| 549 | } |
562 | } |
| 550 | path[len] = '\0'; |
563 | path[len] = '\0'; |
| 551 | 564 | ||
| 552 | /* |
565 | /* |
| 553 | * Avoid the race condition in which the file can be deleted before we |
566 | * Avoid the race condition in which the file can be deleted before we |
| 554 | * find/create-and-lock the VFS node corresponding to the looked-up |
567 | * find/create-and-lock the VFS node corresponding to the looked-up |
| 555 | * triplet. |
568 | * triplet. |
| 556 | */ |
569 | */ |
| 557 | if (lflag & L_CREATE) |
570 | if (lflag & L_CREATE) |
| 558 | fibril_rwlock_write_lock(&namespace_rwlock); |
571 | fibril_rwlock_write_lock(&namespace_rwlock); |
| 559 | else |
572 | else |
| 560 | fibril_rwlock_read_lock(&namespace_rwlock); |
573 | fibril_rwlock_read_lock(&namespace_rwlock); |
| 561 | 574 | ||
| 562 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
575 | /* The path is now populated and we can call vfs_lookup_internal(). */ |
| 563 | vfs_lookup_res_t lr; |
576 | vfs_lookup_res_t lr; |
| 564 | rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL); |
577 | rc = vfs_lookup_internal(path, lflag | L_OPEN, &lr, NULL); |
| 565 | if (rc != EOK) { |
578 | if (rc != EOK) { |
| 566 | if (lflag & L_CREATE) |
579 | if (lflag & L_CREATE) |
| 567 | fibril_rwlock_write_unlock(&namespace_rwlock); |
580 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 568 | else |
581 | else |
| 569 | fibril_rwlock_read_unlock(&namespace_rwlock); |
582 | fibril_rwlock_read_unlock(&namespace_rwlock); |
| 570 | ipc_answer_0(rid, rc); |
583 | ipc_answer_0(rid, rc); |
| 571 | free(path); |
584 | free(path); |
| 572 | return; |
585 | return; |
| 573 | } |
586 | } |
| 574 | 587 | ||
| 575 | /* Path is no longer needed. */ |
588 | /* Path is no longer needed. */ |
| 576 | free(path); |
589 | free(path); |
| 577 | 590 | ||
| 578 | vfs_node_t *node = vfs_node_get(&lr); |
591 | vfs_node_t *node = vfs_node_get(&lr); |
| 579 | if (lflag & L_CREATE) |
592 | if (lflag & L_CREATE) |
| 580 | fibril_rwlock_write_unlock(&namespace_rwlock); |
593 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 581 | else |
594 | else |
| 582 | fibril_rwlock_read_unlock(&namespace_rwlock); |
595 | fibril_rwlock_read_unlock(&namespace_rwlock); |
| 583 | 596 | ||
| 584 | /* Truncate the file if requested and if necessary. */ |
597 | /* Truncate the file if requested and if necessary. */ |
| 585 | if (oflag & O_TRUNC) { |
598 | if (oflag & O_TRUNC) { |
| 586 | fibril_rwlock_write_lock(&node->contents_rwlock); |
599 | fibril_rwlock_write_lock(&node->contents_rwlock); |
| 587 | if (node->size) { |
600 | if (node->size) { |
| 588 | rc = vfs_truncate_internal(node->fs_handle, |
601 | rc = vfs_truncate_internal(node->fs_handle, |
| 589 | node->dev_handle, node->index, 0); |
602 | node->dev_handle, node->index, 0); |
| 590 | if (rc) { |
603 | if (rc) { |
| 591 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
604 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
| 592 | vfs_node_put(node); |
605 | vfs_node_put(node); |
| 593 | ipc_answer_0(rid, rc); |
606 | ipc_answer_0(rid, rc); |
| 594 | return; |
607 | return; |
| 595 | } |
608 | } |
| 596 | node->size = 0; |
609 | node->size = 0; |
| 597 | } |
610 | } |
| 598 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
611 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
| 599 | } |
612 | } |
| 600 | 613 | ||
| 601 | /* |
614 | /* |
| 602 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
615 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
| 603 | * structure. |
616 | * structure. |
| 604 | */ |
617 | */ |
| 605 | int fd = vfs_fd_alloc(); |
618 | int fd = vfs_fd_alloc(); |
| 606 | if (fd < 0) { |
619 | if (fd < 0) { |
| 607 | vfs_node_put(node); |
620 | vfs_node_put(node); |
| 608 | ipc_answer_0(rid, fd); |
621 | ipc_answer_0(rid, fd); |
| 609 | return; |
622 | return; |
| 610 | } |
623 | } |
| 611 | vfs_file_t *file = vfs_file_get(fd); |
624 | vfs_file_t *file = vfs_file_get(fd); |
| 612 | file->node = node; |
625 | file->node = node; |
| 613 | if (oflag & O_APPEND) |
626 | if (oflag & O_APPEND) |
| 614 | file->append = true; |
627 | file->append = true; |
| 615 | 628 | ||
| 616 | /* |
629 | /* |
| 617 | * The following increase in reference count is for the fact that the |
630 | * The following increase in reference count is for the fact that the |
| 618 | * file is being opened and that a file structure is pointing to it. |
631 | * file is being opened and that a file structure is pointing to it. |
| 619 | * It is necessary so that the file will not disappear when |
632 | * It is necessary so that the file will not disappear when |
| 620 | * vfs_node_put() is called. The reference will be dropped by the |
633 | * vfs_node_put() is called. The reference will be dropped by the |
| 621 | * respective VFS_CLOSE. |
634 | * respective VFS_CLOSE. |
| 622 | */ |
635 | */ |
| 623 | vfs_node_addref(node); |
636 | vfs_node_addref(node); |
| 624 | vfs_node_put(node); |
637 | vfs_node_put(node); |
| 625 | 638 | ||
| 626 | /* Success! Return the new file descriptor to the client. */ |
639 | /* Success! Return the new file descriptor to the client. */ |
| 627 | ipc_answer_1(rid, EOK, fd); |
640 | ipc_answer_1(rid, EOK, fd); |
| 628 | } |
641 | } |
| 629 | 642 | ||
| 630 | void vfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
643 | void vfs_open_node(ipc_callid_t rid, ipc_call_t *request) |
| 631 | { |
644 | { |
| 632 | // FIXME: check for sanity of the supplied fs, dev and index |
645 | // FIXME: check for sanity of the supplied fs, dev and index |
| 633 | 646 | ||
| 634 | if (!vfs_files_init()) { |
647 | if (!vfs_files_init()) { |
| 635 | ipc_answer_0(rid, ENOMEM); |
648 | ipc_answer_0(rid, ENOMEM); |
| 636 | return; |
649 | return; |
| 637 | } |
650 | } |
| 638 | 651 | ||
| 639 | /* |
652 | /* |
| 640 | * The interface is open_node(fs, dev, index, oflag). |
653 | * The interface is open_node(fs, dev, index, oflag). |
| 641 | */ |
654 | */ |
| 642 | vfs_lookup_res_t lr; |
655 | vfs_lookup_res_t lr; |
| 643 | 656 | ||
| 644 | lr.triplet.fs_handle = IPC_GET_ARG1(*request); |
657 | lr.triplet.fs_handle = IPC_GET_ARG1(*request); |
| 645 | lr.triplet.dev_handle = IPC_GET_ARG2(*request); |
658 | lr.triplet.dev_handle = IPC_GET_ARG2(*request); |
| 646 | lr.triplet.index = IPC_GET_ARG3(*request); |
659 | lr.triplet.index = IPC_GET_ARG3(*request); |
| 647 | int oflag = IPC_GET_ARG4(*request); |
660 | int oflag = IPC_GET_ARG4(*request); |
| 648 | 661 | ||
| 649 | fibril_rwlock_read_lock(&namespace_rwlock); |
662 | fibril_rwlock_read_lock(&namespace_rwlock); |
| 650 | 663 | ||
| 651 | int rc = vfs_open_node_internal(&lr); |
664 | int rc = vfs_open_node_internal(&lr); |
| 652 | if (rc != EOK) { |
665 | if (rc != EOK) { |
| 653 | fibril_rwlock_read_unlock(&namespace_rwlock); |
666 | fibril_rwlock_read_unlock(&namespace_rwlock); |
| 654 | ipc_answer_0(rid, rc); |
667 | ipc_answer_0(rid, rc); |
| 655 | return; |
668 | return; |
| 656 | } |
669 | } |
| 657 | 670 | ||
| 658 | vfs_node_t *node = vfs_node_get(&lr); |
671 | vfs_node_t *node = vfs_node_get(&lr); |
| 659 | fibril_rwlock_read_unlock(&namespace_rwlock); |
672 | fibril_rwlock_read_unlock(&namespace_rwlock); |
| 660 | 673 | ||
| 661 | /* Truncate the file if requested and if necessary. */ |
674 | /* Truncate the file if requested and if necessary. */ |
| 662 | if (oflag & O_TRUNC) { |
675 | if (oflag & O_TRUNC) { |
| 663 | fibril_rwlock_write_lock(&node->contents_rwlock); |
676 | fibril_rwlock_write_lock(&node->contents_rwlock); |
| 664 | if (node->size) { |
677 | if (node->size) { |
| 665 | rc = vfs_truncate_internal(node->fs_handle, |
678 | rc = vfs_truncate_internal(node->fs_handle, |
| 666 | node->dev_handle, node->index, 0); |
679 | node->dev_handle, node->index, 0); |
| 667 | if (rc) { |
680 | if (rc) { |
| 668 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
681 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
| 669 | vfs_node_put(node); |
682 | vfs_node_put(node); |
| 670 | ipc_answer_0(rid, rc); |
683 | ipc_answer_0(rid, rc); |
| 671 | return; |
684 | return; |
| 672 | } |
685 | } |
| 673 | node->size = 0; |
686 | node->size = 0; |
| 674 | } |
687 | } |
| 675 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
688 | fibril_rwlock_write_unlock(&node->contents_rwlock); |
| 676 | } |
689 | } |
| 677 | 690 | ||
| 678 | /* |
691 | /* |
| 679 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
692 | * Get ourselves a file descriptor and the corresponding vfs_file_t |
| 680 | * structure. |
693 | * structure. |
| 681 | */ |
694 | */ |
| 682 | int fd = vfs_fd_alloc(); |
695 | int fd = vfs_fd_alloc(); |
| 683 | if (fd < 0) { |
696 | if (fd < 0) { |
| 684 | vfs_node_put(node); |
697 | vfs_node_put(node); |
| 685 | ipc_answer_0(rid, fd); |
698 | ipc_answer_0(rid, fd); |
| 686 | return; |
699 | return; |
| 687 | } |
700 | } |
| 688 | vfs_file_t *file = vfs_file_get(fd); |
701 | vfs_file_t *file = vfs_file_get(fd); |
| 689 | file->node = node; |
702 | file->node = node; |
| 690 | if (oflag & O_APPEND) |
703 | if (oflag & O_APPEND) |
| 691 | file->append = true; |
704 | file->append = true; |
| 692 | 705 | ||
| 693 | /* |
706 | /* |
| 694 | * The following increase in reference count is for the fact that the |
707 | * The following increase in reference count is for the fact that the |
| 695 | * file is being opened and that a file structure is pointing to it. |
708 | * file is being opened and that a file structure is pointing to it. |
| 696 | * It is necessary so that the file will not disappear when |
709 | * It is necessary so that the file will not disappear when |
| 697 | * vfs_node_put() is called. The reference will be dropped by the |
710 | * vfs_node_put() is called. The reference will be dropped by the |
| 698 | * respective VFS_CLOSE. |
711 | * respective VFS_CLOSE. |
| 699 | */ |
712 | */ |
| 700 | vfs_node_addref(node); |
713 | vfs_node_addref(node); |
| 701 | vfs_node_put(node); |
714 | vfs_node_put(node); |
| 702 | 715 | ||
| 703 | /* Success! Return the new file descriptor to the client. */ |
716 | /* Success! Return the new file descriptor to the client. */ |
| 704 | ipc_answer_1(rid, EOK, fd); |
717 | ipc_answer_1(rid, EOK, fd); |
| 705 | } |
718 | } |
| 706 | 719 | ||
| 707 | void vfs_node(ipc_callid_t rid, ipc_call_t *request) |
720 | void vfs_node(ipc_callid_t rid, ipc_call_t *request) |
| 708 | { |
721 | { |
| 709 | int fd = IPC_GET_ARG1(*request); |
722 | int fd = IPC_GET_ARG1(*request); |
| 710 | 723 | ||
| 711 | /* Lookup the file structure corresponding to the file descriptor. */ |
724 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 712 | vfs_file_t *file = vfs_file_get(fd); |
725 | vfs_file_t *file = vfs_file_get(fd); |
| 713 | if (!file) { |
726 | if (!file) { |
| 714 | ipc_answer_0(rid, ENOENT); |
727 | ipc_answer_0(rid, ENOENT); |
| 715 | return; |
728 | return; |
| 716 | } |
729 | } |
| 717 | 730 | ||
| 718 | ipc_answer_3(rid, EOK, file->node->fs_handle, file->node->dev_handle, |
731 | ipc_answer_3(rid, EOK, file->node->fs_handle, file->node->dev_handle, |
| 719 | file->node->index); |
732 | file->node->index); |
| 720 | } |
733 | } |
| 721 | 734 | ||
| 722 | void vfs_device(ipc_callid_t rid, ipc_call_t *request) |
735 | void vfs_device(ipc_callid_t rid, ipc_call_t *request) |
| 723 | { |
736 | { |
| 724 | int fd = IPC_GET_ARG1(*request); |
737 | int fd = IPC_GET_ARG1(*request); |
| 725 | 738 | ||
| 726 | /* Lookup the file structure corresponding to the file descriptor. */ |
739 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 727 | vfs_file_t *file = vfs_file_get(fd); |
740 | vfs_file_t *file = vfs_file_get(fd); |
| 728 | if (!file) { |
741 | if (!file) { |
| 729 | ipc_answer_0(rid, ENOENT); |
742 | ipc_answer_0(rid, ENOENT); |
| 730 | return; |
743 | return; |
| 731 | } |
744 | } |
| 732 | 745 | ||
| 733 | /* |
746 | /* |
| 734 | * Lock the open file structure so that no other thread can manipulate |
747 | * Lock the open file structure so that no other thread can manipulate |
| 735 | * the same open file at a time. |
748 | * the same open file at a time. |
| 736 | */ |
749 | */ |
| 737 | fibril_mutex_lock(&file->lock); |
750 | fibril_mutex_lock(&file->lock); |
| 738 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
751 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
| 739 | 752 | ||
| 740 | /* Make a VFS_DEVICE request at the destination FS server. */ |
753 | /* Make a VFS_DEVICE request at the destination FS server. */ |
| 741 | aid_t msg; |
754 | aid_t msg; |
| 742 | ipc_call_t answer; |
755 | ipc_call_t answer; |
| 743 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
756 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
| 744 | file->node->dev_handle, file->node->index, &answer); |
757 | file->node->dev_handle, file->node->index, &answer); |
| 745 | 758 | ||
| 746 | vfs_release_phone(fs_phone); |
759 | vfs_release_phone(fs_phone); |
| 747 | 760 | ||
| 748 | /* Wait for reply from the FS server. */ |
761 | /* Wait for reply from the FS server. */ |
| 749 | ipcarg_t rc; |
762 | ipcarg_t rc; |
| 750 | async_wait_for(msg, &rc); |
763 | async_wait_for(msg, &rc); |
| 751 | 764 | ||
| 752 | fibril_mutex_unlock(&file->lock); |
765 | fibril_mutex_unlock(&file->lock); |
| 753 | 766 | ||
| 754 | ipc_answer_1(rid, EOK, IPC_GET_ARG1(answer)); |
767 | ipc_answer_1(rid, EOK, IPC_GET_ARG1(answer)); |
| 755 | } |
768 | } |
| 756 | 769 | ||
| 757 | void vfs_sync(ipc_callid_t rid, ipc_call_t *request) |
770 | void vfs_sync(ipc_callid_t rid, ipc_call_t *request) |
| 758 | { |
771 | { |
| 759 | int fd = IPC_GET_ARG1(*request); |
772 | int fd = IPC_GET_ARG1(*request); |
| 760 | 773 | ||
| 761 | /* Lookup the file structure corresponding to the file descriptor. */ |
774 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 762 | vfs_file_t *file = vfs_file_get(fd); |
775 | vfs_file_t *file = vfs_file_get(fd); |
| 763 | if (!file) { |
776 | if (!file) { |
| 764 | ipc_answer_0(rid, ENOENT); |
777 | ipc_answer_0(rid, ENOENT); |
| 765 | return; |
778 | return; |
| 766 | } |
779 | } |
| 767 | 780 | ||
| 768 | /* |
781 | /* |
| 769 | * Lock the open file structure so that no other thread can manipulate |
782 | * Lock the open file structure so that no other thread can manipulate |
| 770 | * the same open file at a time. |
783 | * the same open file at a time. |
| 771 | */ |
784 | */ |
| 772 | fibril_mutex_lock(&file->lock); |
785 | fibril_mutex_lock(&file->lock); |
| 773 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
786 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
| 774 | 787 | ||
| 775 | /* Make a VFS_SYMC request at the destination FS server. */ |
788 | /* Make a VFS_SYMC request at the destination FS server. */ |
| 776 | aid_t msg; |
789 | aid_t msg; |
| 777 | ipc_call_t answer; |
790 | ipc_call_t answer; |
| 778 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
791 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
| 779 | file->node->dev_handle, file->node->index, &answer); |
792 | file->node->dev_handle, file->node->index, &answer); |
| 780 | 793 | ||
| 781 | vfs_release_phone(fs_phone); |
794 | vfs_release_phone(fs_phone); |
| 782 | 795 | ||
| 783 | /* Wait for reply from the FS server. */ |
796 | /* Wait for reply from the FS server. */ |
| 784 | ipcarg_t rc; |
797 | ipcarg_t rc; |
| 785 | async_wait_for(msg, &rc); |
798 | async_wait_for(msg, &rc); |
| 786 | 799 | ||
| 787 | fibril_mutex_unlock(&file->lock); |
800 | fibril_mutex_unlock(&file->lock); |
| 788 | 801 | ||
| 789 | ipc_answer_0(rid, rc); |
802 | ipc_answer_0(rid, rc); |
| 790 | } |
803 | } |
| 791 | 804 | ||
| 792 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
805 | void vfs_close(ipc_callid_t rid, ipc_call_t *request) |
| 793 | { |
806 | { |
| 794 | int fd = IPC_GET_ARG1(*request); |
807 | int fd = IPC_GET_ARG1(*request); |
| 795 | 808 | ||
| 796 | /* Lookup the file structure corresponding to the file descriptor. */ |
809 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 797 | vfs_file_t *file = vfs_file_get(fd); |
810 | vfs_file_t *file = vfs_file_get(fd); |
| 798 | if (!file) { |
811 | if (!file) { |
| 799 | ipc_answer_0(rid, ENOENT); |
812 | ipc_answer_0(rid, ENOENT); |
| 800 | return; |
813 | return; |
| 801 | } |
814 | } |
| 802 | 815 | ||
| 803 | /* |
816 | /* |
| 804 | * Lock the open file structure so that no other thread can manipulate |
817 | * Lock the open file structure so that no other thread can manipulate |
| 805 | * the same open file at a time. |
818 | * the same open file at a time. |
| 806 | */ |
819 | */ |
| 807 | fibril_mutex_lock(&file->lock); |
820 | fibril_mutex_lock(&file->lock); |
| 808 | 821 | ||
| 809 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
822 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
| 810 | 823 | ||
| 811 | /* Make a VFS_CLOSE request at the destination FS server. */ |
824 | /* Make a VFS_CLOSE request at the destination FS server. */ |
| 812 | aid_t msg; |
825 | aid_t msg; |
| 813 | ipc_call_t answer; |
826 | ipc_call_t answer; |
| 814 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
827 | msg = async_send_2(fs_phone, IPC_GET_METHOD(*request), |
| 815 | file->node->dev_handle, file->node->index, &answer); |
828 | file->node->dev_handle, file->node->index, &answer); |
| 816 | 829 | ||
| 817 | vfs_release_phone(fs_phone); |
830 | vfs_release_phone(fs_phone); |
| 818 | 831 | ||
| 819 | /* Wait for reply from the FS server. */ |
832 | /* Wait for reply from the FS server. */ |
| 820 | ipcarg_t rc; |
833 | ipcarg_t rc; |
| 821 | async_wait_for(msg, &rc); |
834 | async_wait_for(msg, &rc); |
| 822 | 835 | ||
| 823 | fibril_mutex_unlock(&file->lock); |
836 | fibril_mutex_unlock(&file->lock); |
| 824 | 837 | ||
| 825 | int retval = IPC_GET_ARG1(answer); |
838 | int retval = IPC_GET_ARG1(answer); |
| 826 | if (retval != EOK) |
839 | if (retval != EOK) |
| 827 | ipc_answer_0(rid, retval); |
840 | ipc_answer_0(rid, retval); |
| 828 | 841 | ||
| 829 | retval = vfs_fd_free(fd); |
842 | retval = vfs_fd_free(fd); |
| 830 | ipc_answer_0(rid, retval); |
843 | ipc_answer_0(rid, retval); |
| 831 | } |
844 | } |
| 832 | 845 | ||
| 833 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
846 | static void vfs_rdwr(ipc_callid_t rid, ipc_call_t *request, bool read) |
| 834 | { |
847 | { |
| 835 | 848 | ||
| 836 | /* |
849 | /* |
| 837 | * The following code strongly depends on the fact that the files data |
850 | * The following code strongly depends on the fact that the files data |
| 838 | * structure can be only accessed by a single fibril and all file |
851 | * structure can be only accessed by a single fibril and all file |
| 839 | * operations are serialized (i.e. the reads and writes cannot |
852 | * operations are serialized (i.e. the reads and writes cannot |
| 840 | * interleave and a file cannot be closed while it is being read). |
853 | * interleave and a file cannot be closed while it is being read). |
| 841 | * |
854 | * |
| 842 | * Additional synchronization needs to be added once the table of |
855 | * Additional synchronization needs to be added once the table of |
| 843 | * open files supports parallel access! |
856 | * open files supports parallel access! |
| 844 | */ |
857 | */ |
| 845 | 858 | ||
| 846 | int fd = IPC_GET_ARG1(*request); |
859 | int fd = IPC_GET_ARG1(*request); |
| 847 | 860 | ||
| 848 | /* Lookup the file structure corresponding to the file descriptor. */ |
861 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 849 | vfs_file_t *file = vfs_file_get(fd); |
862 | vfs_file_t *file = vfs_file_get(fd); |
| 850 | if (!file) { |
863 | if (!file) { |
| 851 | ipc_answer_0(rid, ENOENT); |
864 | ipc_answer_0(rid, ENOENT); |
| 852 | return; |
865 | return; |
| 853 | } |
866 | } |
| 854 | 867 | ||
| 855 | /* |
868 | /* |
| 856 | * Now we need to receive a call with client's |
869 | * Now we need to receive a call with client's |
| 857 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
870 | * IPC_M_DATA_READ/IPC_M_DATA_WRITE request. |
| 858 | */ |
871 | */ |
| 859 | ipc_callid_t callid; |
872 | ipc_callid_t callid; |
| 860 | int res; |
873 | int res; |
| 861 | if (read) |
874 | if (read) |
| 862 | res = ipc_data_read_receive(&callid, NULL); |
875 | res = ipc_data_read_receive(&callid, NULL); |
| 863 | else |
876 | else |
| 864 | res = ipc_data_write_receive(&callid, NULL); |
877 | res = ipc_data_write_receive(&callid, NULL); |
| 865 | if (!res) { |
878 | if (!res) { |
| 866 | ipc_answer_0(callid, EINVAL); |
879 | ipc_answer_0(callid, EINVAL); |
| 867 | ipc_answer_0(rid, EINVAL); |
880 | ipc_answer_0(rid, EINVAL); |
| 868 | return; |
881 | return; |
| 869 | } |
882 | } |
| 870 | 883 | ||
| 871 | /* |
884 | /* |
| 872 | * Lock the open file structure so that no other thread can manipulate |
885 | * Lock the open file structure so that no other thread can manipulate |
| 873 | * the same open file at a time. |
886 | * the same open file at a time. |
| 874 | */ |
887 | */ |
| 875 | fibril_mutex_lock(&file->lock); |
888 | fibril_mutex_lock(&file->lock); |
| 876 | 889 | ||
| 877 | /* |
890 | /* |
| 878 | * Lock the file's node so that no other client can read/write to it at |
891 | * Lock the file's node so that no other client can read/write to it at |
| 879 | * the same time. |
892 | * the same time. |
| 880 | */ |
893 | */ |
| 881 | if (read) |
894 | if (read) |
| 882 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
895 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
| 883 | else |
896 | else |
| 884 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
897 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
| 885 | 898 | ||
| 886 | if (file->node->type == VFS_NODE_DIRECTORY) { |
899 | if (file->node->type == VFS_NODE_DIRECTORY) { |
| 887 | /* |
900 | /* |
| 888 | * Make sure that no one is modifying the namespace |
901 | * Make sure that no one is modifying the namespace |
| 889 | * while we are in readdir(). |
902 | * while we are in readdir(). |
| 890 | */ |
903 | */ |
| 891 | assert(read); |
904 | assert(read); |
| 892 | fibril_rwlock_read_lock(&namespace_rwlock); |
905 | fibril_rwlock_read_lock(&namespace_rwlock); |
| 893 | } |
906 | } |
| 894 | 907 | ||
| 895 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
908 | int fs_phone = vfs_grab_phone(file->node->fs_handle); |
| 896 | 909 | ||
| 897 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
910 | /* Make a VFS_READ/VFS_WRITE request at the destination FS server. */ |
| 898 | aid_t msg; |
911 | aid_t msg; |
| 899 | ipc_call_t answer; |
912 | ipc_call_t answer; |
| 900 | if (!read && file->append) |
913 | if (!read && file->append) |
| 901 | file->pos = file->node->size; |
914 | file->pos = file->node->size; |
| 902 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
915 | msg = async_send_3(fs_phone, IPC_GET_METHOD(*request), |
| 903 | file->node->dev_handle, file->node->index, file->pos, &answer); |
916 | file->node->dev_handle, file->node->index, file->pos, &answer); |
| 904 | 917 | ||
| 905 | /* |
918 | /* |
| 906 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
919 | * Forward the IPC_M_DATA_READ/IPC_M_DATA_WRITE request to the |
| 907 | * destination FS server. The call will be routed as if sent by |
920 | * destination FS server. The call will be routed as if sent by |
| 908 | * ourselves. Note that call arguments are immutable in this case so we |
921 | * ourselves. Note that call arguments are immutable in this case so we |
| 909 | * don't have to bother. |
922 | * don't have to bother. |
| 910 | */ |
923 | */ |
| 911 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
924 | ipc_forward_fast(callid, fs_phone, 0, 0, 0, IPC_FF_ROUTE_FROM_ME); |
| 912 | 925 | ||
| 913 | vfs_release_phone(fs_phone); |
926 | vfs_release_phone(fs_phone); |
| 914 | 927 | ||
| 915 | /* Wait for reply from the FS server. */ |
928 | /* Wait for reply from the FS server. */ |
| 916 | ipcarg_t rc; |
929 | ipcarg_t rc; |
| 917 | async_wait_for(msg, &rc); |
930 | async_wait_for(msg, &rc); |
| 918 | 931 | ||
| 919 | size_t bytes = IPC_GET_ARG1(answer); |
932 | size_t bytes = IPC_GET_ARG1(answer); |
| 920 | 933 | ||
| 921 | if (file->node->type == VFS_NODE_DIRECTORY) |
934 | if (file->node->type == VFS_NODE_DIRECTORY) |
| 922 | fibril_rwlock_read_unlock(&namespace_rwlock); |
935 | fibril_rwlock_read_unlock(&namespace_rwlock); |
| 923 | 936 | ||
| 924 | /* Unlock the VFS node. */ |
937 | /* Unlock the VFS node. */ |
| 925 | if (read) |
938 | if (read) |
| 926 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
939 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
| 927 | else { |
940 | else { |
| 928 | /* Update the cached version of node's size. */ |
941 | /* Update the cached version of node's size. */ |
| 929 | if (rc == EOK) |
942 | if (rc == EOK) |
| 930 | file->node->size = IPC_GET_ARG2(answer); |
943 | file->node->size = IPC_GET_ARG2(answer); |
| 931 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
944 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
| 932 | } |
945 | } |
| 933 | 946 | ||
| 934 | /* Update the position pointer and unlock the open file. */ |
947 | /* Update the position pointer and unlock the open file. */ |
| 935 | if (rc == EOK) |
948 | if (rc == EOK) |
| 936 | file->pos += bytes; |
949 | file->pos += bytes; |
| 937 | fibril_mutex_unlock(&file->lock); |
950 | fibril_mutex_unlock(&file->lock); |
| 938 | 951 | ||
| 939 | /* |
952 | /* |
| 940 | * FS server's reply is the final result of the whole operation we |
953 | * FS server's reply is the final result of the whole operation we |
| 941 | * return to the client. |
954 | * return to the client. |
| 942 | */ |
955 | */ |
| 943 | ipc_answer_1(rid, rc, bytes); |
956 | ipc_answer_1(rid, rc, bytes); |
| 944 | } |
957 | } |
| 945 | 958 | ||
| 946 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
959 | void vfs_read(ipc_callid_t rid, ipc_call_t *request) |
| 947 | { |
960 | { |
| 948 | vfs_rdwr(rid, request, true); |
961 | vfs_rdwr(rid, request, true); |
| 949 | } |
962 | } |
| 950 | 963 | ||
| 951 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
964 | void vfs_write(ipc_callid_t rid, ipc_call_t *request) |
| 952 | { |
965 | { |
| 953 | vfs_rdwr(rid, request, false); |
966 | vfs_rdwr(rid, request, false); |
| 954 | } |
967 | } |
| 955 | 968 | ||
| 956 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
969 | void vfs_seek(ipc_callid_t rid, ipc_call_t *request) |
| 957 | { |
970 | { |
| 958 | int fd = (int) IPC_GET_ARG1(*request); |
971 | int fd = (int) IPC_GET_ARG1(*request); |
| 959 | off_t off = (off_t) IPC_GET_ARG2(*request); |
972 | off_t off = (off_t) IPC_GET_ARG2(*request); |
| 960 | int whence = (int) IPC_GET_ARG3(*request); |
973 | int whence = (int) IPC_GET_ARG3(*request); |
| 961 | 974 | ||
| 962 | 975 | ||
| 963 | /* Lookup the file structure corresponding to the file descriptor. */ |
976 | /* Lookup the file structure corresponding to the file descriptor. */ |
| 964 | vfs_file_t *file = vfs_file_get(fd); |
977 | vfs_file_t *file = vfs_file_get(fd); |
| 965 | if (!file) { |
978 | if (!file) { |
| 966 | ipc_answer_0(rid, ENOENT); |
979 | ipc_answer_0(rid, ENOENT); |
| 967 | return; |
980 | return; |
| 968 | } |
981 | } |
| 969 | 982 | ||
| 970 | off_t newpos; |
983 | off_t newpos; |
| 971 | fibril_mutex_lock(&file->lock); |
984 | fibril_mutex_lock(&file->lock); |
| 972 | if (whence == SEEK_SET) { |
985 | if (whence == SEEK_SET) { |
| 973 | file->pos = off; |
986 | file->pos = off; |
| 974 | fibril_mutex_unlock(&file->lock); |
987 | fibril_mutex_unlock(&file->lock); |
| 975 | ipc_answer_1(rid, EOK, off); |
988 | ipc_answer_1(rid, EOK, off); |
| 976 | return; |
989 | return; |
| 977 | } |
990 | } |
| 978 | if (whence == SEEK_CUR) { |
991 | if (whence == SEEK_CUR) { |
| 979 | if (file->pos + off < file->pos) { |
992 | if (file->pos + off < file->pos) { |
| 980 | fibril_mutex_unlock(&file->lock); |
993 | fibril_mutex_unlock(&file->lock); |
| 981 | ipc_answer_0(rid, EOVERFLOW); |
994 | ipc_answer_0(rid, EOVERFLOW); |
| 982 | return; |
995 | return; |
| 983 | } |
996 | } |
| 984 | file->pos += off; |
997 | file->pos += off; |
| 985 | newpos = file->pos; |
998 | newpos = file->pos; |
| 986 | fibril_mutex_unlock(&file->lock); |
999 | fibril_mutex_unlock(&file->lock); |
| 987 | ipc_answer_1(rid, EOK, newpos); |
1000 | ipc_answer_1(rid, EOK, newpos); |
| 988 | return; |
1001 | return; |
| 989 | } |
1002 | } |
| 990 | if (whence == SEEK_END) { |
1003 | if (whence == SEEK_END) { |
| 991 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
1004 | fibril_rwlock_read_lock(&file->node->contents_rwlock); |
| 992 | size_t size = file->node->size; |
1005 | size_t size = file->node->size; |
| 993 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
1006 | fibril_rwlock_read_unlock(&file->node->contents_rwlock); |
| 994 | if (size + off < size) { |
1007 | if (size + off < size) { |
| 995 | fibril_mutex_unlock(&file->lock); |
1008 | fibril_mutex_unlock(&file->lock); |
| 996 | ipc_answer_0(rid, EOVERFLOW); |
1009 | ipc_answer_0(rid, EOVERFLOW); |
| 997 | return; |
1010 | return; |
| 998 | } |
1011 | } |
| 999 | newpos = size + off; |
1012 | newpos = size + off; |
| 1000 | fibril_mutex_unlock(&file->lock); |
1013 | fibril_mutex_unlock(&file->lock); |
| 1001 | ipc_answer_1(rid, EOK, newpos); |
1014 | ipc_answer_1(rid, EOK, newpos); |
| 1002 | return; |
1015 | return; |
| 1003 | } |
1016 | } |
| 1004 | fibril_mutex_unlock(&file->lock); |
1017 | fibril_mutex_unlock(&file->lock); |
| 1005 | ipc_answer_0(rid, EINVAL); |
1018 | ipc_answer_0(rid, EINVAL); |
| 1006 | } |
1019 | } |
| 1007 | 1020 | ||
| 1008 | int |
1021 | int |
| 1009 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
1022 | vfs_truncate_internal(fs_handle_t fs_handle, dev_handle_t dev_handle, |
| 1010 | fs_index_t index, size_t size) |
1023 | fs_index_t index, size_t size) |
| 1011 | { |
1024 | { |
| 1012 | ipcarg_t rc; |
1025 | ipcarg_t rc; |
| 1013 | int fs_phone; |
1026 | int fs_phone; |
| 1014 | 1027 | ||
| 1015 | fs_phone = vfs_grab_phone(fs_handle); |
1028 | fs_phone = vfs_grab_phone(fs_handle); |
| 1016 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
1029 | rc = async_req_3_0(fs_phone, VFS_TRUNCATE, (ipcarg_t)dev_handle, |
| 1017 | (ipcarg_t)index, (ipcarg_t)size); |
1030 | (ipcarg_t)index, (ipcarg_t)size); |
| 1018 | vfs_release_phone(fs_phone); |
1031 | vfs_release_phone(fs_phone); |
| 1019 | return (int)rc; |
1032 | return (int)rc; |
| 1020 | } |
1033 | } |
| 1021 | 1034 | ||
| 1022 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
1035 | void vfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
| 1023 | { |
1036 | { |
| 1024 | int fd = IPC_GET_ARG1(*request); |
1037 | int fd = IPC_GET_ARG1(*request); |
| 1025 | size_t size = IPC_GET_ARG2(*request); |
1038 | size_t size = IPC_GET_ARG2(*request); |
| 1026 | int rc; |
1039 | int rc; |
| 1027 | 1040 | ||
| 1028 | vfs_file_t *file = vfs_file_get(fd); |
1041 | vfs_file_t *file = vfs_file_get(fd); |
| 1029 | if (!file) { |
1042 | if (!file) { |
| 1030 | ipc_answer_0(rid, ENOENT); |
1043 | ipc_answer_0(rid, ENOENT); |
| 1031 | return; |
1044 | return; |
| 1032 | } |
1045 | } |
| 1033 | fibril_mutex_lock(&file->lock); |
1046 | fibril_mutex_lock(&file->lock); |
| 1034 | 1047 | ||
| 1035 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
1048 | fibril_rwlock_write_lock(&file->node->contents_rwlock); |
| 1036 | rc = vfs_truncate_internal(file->node->fs_handle, |
1049 | rc = vfs_truncate_internal(file->node->fs_handle, |
| 1037 | file->node->dev_handle, file->node->index, size); |
1050 | file->node->dev_handle, file->node->index, size); |
| 1038 | if (rc == EOK) |
1051 | if (rc == EOK) |
| 1039 | file->node->size = size; |
1052 | file->node->size = size; |
| 1040 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
1053 | fibril_rwlock_write_unlock(&file->node->contents_rwlock); |
| 1041 | 1054 | ||
| 1042 | fibril_mutex_unlock(&file->lock); |
1055 | fibril_mutex_unlock(&file->lock); |
| 1043 | ipc_answer_0(rid, (ipcarg_t)rc); |
1056 | ipc_answer_0(rid, (ipcarg_t)rc); |
| 1044 | } |
1057 | } |
| 1045 | 1058 | ||
| 1046 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
1059 | void vfs_mkdir(ipc_callid_t rid, ipc_call_t *request) |
| 1047 | { |
1060 | { |
| 1048 | int mode = IPC_GET_ARG1(*request); |
1061 | int mode = IPC_GET_ARG1(*request); |
| 1049 | 1062 | ||
| 1050 | size_t len; |
1063 | size_t len; |
| 1051 | ipc_callid_t callid; |
1064 | ipc_callid_t callid; |
| 1052 | 1065 | ||
| 1053 | if (!ipc_data_write_receive(&callid, &len)) { |
1066 | if (!ipc_data_write_receive(&callid, &len)) { |
| 1054 | ipc_answer_0(callid, EINVAL); |
1067 | ipc_answer_0(callid, EINVAL); |
| 1055 | ipc_answer_0(rid, EINVAL); |
1068 | ipc_answer_0(rid, EINVAL); |
| 1056 | return; |
1069 | return; |
| 1057 | } |
1070 | } |
| 1058 | char *path = malloc(len + 1); |
1071 | char *path = malloc(len + 1); |
| 1059 | if (!path) { |
1072 | if (!path) { |
| 1060 | ipc_answer_0(callid, ENOMEM); |
1073 | ipc_answer_0(callid, ENOMEM); |
| 1061 | ipc_answer_0(rid, ENOMEM); |
1074 | ipc_answer_0(rid, ENOMEM); |
| 1062 | return; |
1075 | return; |
| 1063 | } |
1076 | } |
| 1064 | int rc; |
1077 | int rc; |
| 1065 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1078 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
| 1066 | ipc_answer_0(rid, rc); |
1079 | ipc_answer_0(rid, rc); |
| 1067 | free(path); |
1080 | free(path); |
| 1068 | return; |
1081 | return; |
| 1069 | } |
1082 | } |
| 1070 | path[len] = '\0'; |
1083 | path[len] = '\0'; |
| 1071 | 1084 | ||
| 1072 | fibril_rwlock_write_lock(&namespace_rwlock); |
1085 | fibril_rwlock_write_lock(&namespace_rwlock); |
| 1073 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
1086 | int lflag = L_DIRECTORY | L_CREATE | L_EXCLUSIVE; |
| 1074 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
1087 | rc = vfs_lookup_internal(path, lflag, NULL, NULL); |
| 1075 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1088 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1076 | free(path); |
1089 | free(path); |
| 1077 | ipc_answer_0(rid, rc); |
1090 | ipc_answer_0(rid, rc); |
| 1078 | } |
1091 | } |
| 1079 | 1092 | ||
| 1080 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
1093 | void vfs_unlink(ipc_callid_t rid, ipc_call_t *request) |
| 1081 | { |
1094 | { |
| 1082 | int lflag = IPC_GET_ARG1(*request); |
1095 | int lflag = IPC_GET_ARG1(*request); |
| 1083 | 1096 | ||
| 1084 | size_t len; |
1097 | size_t len; |
| 1085 | ipc_callid_t callid; |
1098 | ipc_callid_t callid; |
| 1086 | 1099 | ||
| 1087 | if (!ipc_data_write_receive(&callid, &len)) { |
1100 | if (!ipc_data_write_receive(&callid, &len)) { |
| 1088 | ipc_answer_0(callid, EINVAL); |
1101 | ipc_answer_0(callid, EINVAL); |
| 1089 | ipc_answer_0(rid, EINVAL); |
1102 | ipc_answer_0(rid, EINVAL); |
| 1090 | return; |
1103 | return; |
| 1091 | } |
1104 | } |
| 1092 | char *path = malloc(len + 1); |
1105 | char *path = malloc(len + 1); |
| 1093 | if (!path) { |
1106 | if (!path) { |
| 1094 | ipc_answer_0(callid, ENOMEM); |
1107 | ipc_answer_0(callid, ENOMEM); |
| 1095 | ipc_answer_0(rid, ENOMEM); |
1108 | ipc_answer_0(rid, ENOMEM); |
| 1096 | return; |
1109 | return; |
| 1097 | } |
1110 | } |
| 1098 | int rc; |
1111 | int rc; |
| 1099 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
1112 | if ((rc = ipc_data_write_finalize(callid, path, len))) { |
| 1100 | ipc_answer_0(rid, rc); |
1113 | ipc_answer_0(rid, rc); |
| 1101 | free(path); |
1114 | free(path); |
| 1102 | return; |
1115 | return; |
| 1103 | } |
1116 | } |
| 1104 | path[len] = '\0'; |
1117 | path[len] = '\0'; |
| 1105 | 1118 | ||
| 1106 | fibril_rwlock_write_lock(&namespace_rwlock); |
1119 | fibril_rwlock_write_lock(&namespace_rwlock); |
| 1107 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
1120 | lflag &= L_DIRECTORY; /* sanitize lflag */ |
| 1108 | vfs_lookup_res_t lr; |
1121 | vfs_lookup_res_t lr; |
| 1109 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
1122 | rc = vfs_lookup_internal(path, lflag | L_UNLINK, &lr, NULL); |
| 1110 | free(path); |
1123 | free(path); |
| 1111 | if (rc != EOK) { |
1124 | if (rc != EOK) { |
| 1112 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1125 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1113 | ipc_answer_0(rid, rc); |
1126 | ipc_answer_0(rid, rc); |
| 1114 | return; |
1127 | return; |
| 1115 | } |
1128 | } |
| 1116 | 1129 | ||
| 1117 | /* |
1130 | /* |
| 1118 | * The name has already been unlinked by vfs_lookup_internal(). |
1131 | * The name has already been unlinked by vfs_lookup_internal(). |
| 1119 | * We have to get and put the VFS node to ensure that it is |
1132 | * We have to get and put the VFS node to ensure that it is |
| 1120 | * VFS_DESTROY'ed after the last reference to it is dropped. |
1133 | * VFS_DESTROY'ed after the last reference to it is dropped. |
| 1121 | */ |
1134 | */ |
| 1122 | vfs_node_t *node = vfs_node_get(&lr); |
1135 | vfs_node_t *node = vfs_node_get(&lr); |
| 1123 | futex_down(&nodes_futex); |
1136 | futex_down(&nodes_futex); |
| 1124 | node->lnkcnt--; |
1137 | node->lnkcnt--; |
| 1125 | futex_up(&nodes_futex); |
1138 | futex_up(&nodes_futex); |
| 1126 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1139 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1127 | vfs_node_put(node); |
1140 | vfs_node_put(node); |
| 1128 | ipc_answer_0(rid, EOK); |
1141 | ipc_answer_0(rid, EOK); |
| 1129 | } |
1142 | } |
| 1130 | 1143 | ||
| 1131 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
1144 | void vfs_rename(ipc_callid_t rid, ipc_call_t *request) |
| 1132 | { |
1145 | { |
| 1133 | size_t olen, nlen; |
1146 | size_t olen, nlen; |
| 1134 | ipc_callid_t callid; |
1147 | ipc_callid_t callid; |
| 1135 | int rc; |
1148 | int rc; |
| 1136 | 1149 | ||
| 1137 | /* Retrieve the old path. */ |
1150 | /* Retrieve the old path. */ |
| 1138 | if (!ipc_data_write_receive(&callid, &olen)) { |
1151 | if (!ipc_data_write_receive(&callid, &olen)) { |
| 1139 | ipc_answer_0(callid, EINVAL); |
1152 | ipc_answer_0(callid, EINVAL); |
| 1140 | ipc_answer_0(rid, EINVAL); |
1153 | ipc_answer_0(rid, EINVAL); |
| 1141 | return; |
1154 | return; |
| 1142 | } |
1155 | } |
| 1143 | char *old = malloc(olen + 1); |
1156 | char *old = malloc(olen + 1); |
| 1144 | if (!old) { |
1157 | if (!old) { |
| 1145 | ipc_answer_0(callid, ENOMEM); |
1158 | ipc_answer_0(callid, ENOMEM); |
| 1146 | ipc_answer_0(rid, ENOMEM); |
1159 | ipc_answer_0(rid, ENOMEM); |
| 1147 | return; |
1160 | return; |
| 1148 | } |
1161 | } |
| 1149 | if ((rc = ipc_data_write_finalize(callid, old, olen))) { |
1162 | if ((rc = ipc_data_write_finalize(callid, old, olen))) { |
| 1150 | ipc_answer_0(rid, rc); |
1163 | ipc_answer_0(rid, rc); |
| 1151 | free(old); |
1164 | free(old); |
| 1152 | return; |
1165 | return; |
| 1153 | } |
1166 | } |
| 1154 | old[olen] = '\0'; |
1167 | old[olen] = '\0'; |
| 1155 | 1168 | ||
| 1156 | /* Retrieve the new path. */ |
1169 | /* Retrieve the new path. */ |
| 1157 | if (!ipc_data_write_receive(&callid, &nlen)) { |
1170 | if (!ipc_data_write_receive(&callid, &nlen)) { |
| 1158 | ipc_answer_0(callid, EINVAL); |
1171 | ipc_answer_0(callid, EINVAL); |
| 1159 | ipc_answer_0(rid, EINVAL); |
1172 | ipc_answer_0(rid, EINVAL); |
| 1160 | free(old); |
1173 | free(old); |
| 1161 | return; |
1174 | return; |
| 1162 | } |
1175 | } |
| 1163 | char *new = malloc(nlen + 1); |
1176 | char *new = malloc(nlen + 1); |
| 1164 | if (!new) { |
1177 | if (!new) { |
| 1165 | ipc_answer_0(callid, ENOMEM); |
1178 | ipc_answer_0(callid, ENOMEM); |
| 1166 | ipc_answer_0(rid, ENOMEM); |
1179 | ipc_answer_0(rid, ENOMEM); |
| 1167 | free(old); |
1180 | free(old); |
| 1168 | return; |
1181 | return; |
| 1169 | } |
1182 | } |
| 1170 | if ((rc = ipc_data_write_finalize(callid, new, nlen))) { |
1183 | if ((rc = ipc_data_write_finalize(callid, new, nlen))) { |
| 1171 | ipc_answer_0(rid, rc); |
1184 | ipc_answer_0(rid, rc); |
| 1172 | free(old); |
1185 | free(old); |
| 1173 | free(new); |
1186 | free(new); |
| 1174 | return; |
1187 | return; |
| 1175 | } |
1188 | } |
| 1176 | new[nlen] = '\0'; |
1189 | new[nlen] = '\0'; |
| 1177 | 1190 | ||
| 1178 | char *oldc = canonify(old, &olen); |
1191 | char *oldc = canonify(old, &olen); |
| 1179 | char *newc = canonify(new, &nlen); |
1192 | char *newc = canonify(new, &nlen); |
| 1180 | if (!oldc || !newc) { |
1193 | if (!oldc || !newc) { |
| 1181 | ipc_answer_0(rid, EINVAL); |
1194 | ipc_answer_0(rid, EINVAL); |
| 1182 | free(old); |
1195 | free(old); |
| 1183 | free(new); |
1196 | free(new); |
| 1184 | return; |
1197 | return; |
| 1185 | } |
1198 | } |
| 1186 | oldc[olen] = '\0'; |
1199 | oldc[olen] = '\0'; |
| 1187 | newc[nlen] = '\0'; |
1200 | newc[nlen] = '\0'; |
| 1188 | if ((!str_lcmp(newc, oldc, str_length(oldc))) && |
1201 | if ((!str_lcmp(newc, oldc, str_length(oldc))) && |
| 1189 | ((newc[str_length(oldc)] == '/') || |
1202 | ((newc[str_length(oldc)] == '/') || |
| 1190 | (str_length(oldc) == 1) || |
1203 | (str_length(oldc) == 1) || |
| 1191 | (str_length(oldc) == str_length(newc)))) { |
1204 | (str_length(oldc) == str_length(newc)))) { |
| 1192 | /* |
1205 | /* |
| 1193 | * oldc is a prefix of newc and either |
1206 | * oldc is a prefix of newc and either |
| 1194 | * - newc continues with a / where oldc ends, or |
1207 | * - newc continues with a / where oldc ends, or |
| 1195 | * - oldc was / itself, or |
1208 | * - oldc was / itself, or |
| 1196 | * - oldc and newc are equal. |
1209 | * - oldc and newc are equal. |
| 1197 | */ |
1210 | */ |
| 1198 | ipc_answer_0(rid, EINVAL); |
1211 | ipc_answer_0(rid, EINVAL); |
| 1199 | free(old); |
1212 | free(old); |
| 1200 | free(new); |
1213 | free(new); |
| 1201 | return; |
1214 | return; |
| 1202 | } |
1215 | } |
| 1203 | 1216 | ||
| 1204 | vfs_lookup_res_t old_lr; |
1217 | vfs_lookup_res_t old_lr; |
| 1205 | vfs_lookup_res_t new_lr; |
1218 | vfs_lookup_res_t new_lr; |
| 1206 | vfs_lookup_res_t new_par_lr; |
1219 | vfs_lookup_res_t new_par_lr; |
| 1207 | fibril_rwlock_write_lock(&namespace_rwlock); |
1220 | fibril_rwlock_write_lock(&namespace_rwlock); |
| 1208 | /* Lookup the node belonging to the old file name. */ |
1221 | /* Lookup the node belonging to the old file name. */ |
| 1209 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
1222 | rc = vfs_lookup_internal(oldc, L_NONE, &old_lr, NULL); |
| 1210 | if (rc != EOK) { |
1223 | if (rc != EOK) { |
| 1211 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1224 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1212 | ipc_answer_0(rid, rc); |
1225 | ipc_answer_0(rid, rc); |
| 1213 | free(old); |
1226 | free(old); |
| 1214 | free(new); |
1227 | free(new); |
| 1215 | return; |
1228 | return; |
| 1216 | } |
1229 | } |
| 1217 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
1230 | vfs_node_t *old_node = vfs_node_get(&old_lr); |
| 1218 | if (!old_node) { |
1231 | if (!old_node) { |
| 1219 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1232 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1220 | ipc_answer_0(rid, ENOMEM); |
1233 | ipc_answer_0(rid, ENOMEM); |
| 1221 | free(old); |
1234 | free(old); |
| 1222 | free(new); |
1235 | free(new); |
| 1223 | return; |
1236 | return; |
| 1224 | } |
1237 | } |
| 1225 | /* Determine the path to the parent of the node with the new name. */ |
1238 | /* Determine the path to the parent of the node with the new name. */ |
| 1226 | char *parentc = str_dup(newc); |
1239 | char *parentc = str_dup(newc); |
| 1227 | if (!parentc) { |
1240 | if (!parentc) { |
| 1228 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1241 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1229 | ipc_answer_0(rid, rc); |
1242 | ipc_answer_0(rid, rc); |
| 1230 | free(old); |
1243 | free(old); |
| 1231 | free(new); |
1244 | free(new); |
| 1232 | return; |
1245 | return; |
| 1233 | } |
1246 | } |
| 1234 | char *lastsl = str_rchr(parentc + 1, '/'); |
1247 | char *lastsl = str_rchr(parentc + 1, '/'); |
| 1235 | if (lastsl) |
1248 | if (lastsl) |
| 1236 | *lastsl = '\0'; |
1249 | *lastsl = '\0'; |
| 1237 | else |
1250 | else |
| 1238 | parentc[1] = '\0'; |
1251 | parentc[1] = '\0'; |
| 1239 | /* Lookup parent of the new file name. */ |
1252 | /* Lookup parent of the new file name. */ |
| 1240 | rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL); |
1253 | rc = vfs_lookup_internal(parentc, L_NONE, &new_par_lr, NULL); |
| 1241 | free(parentc); /* not needed anymore */ |
1254 | free(parentc); /* not needed anymore */ |
| 1242 | if (rc != EOK) { |
1255 | if (rc != EOK) { |
| 1243 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1256 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1244 | ipc_answer_0(rid, rc); |
1257 | ipc_answer_0(rid, rc); |
| 1245 | free(old); |
1258 | free(old); |
| 1246 | free(new); |
1259 | free(new); |
| 1247 | return; |
1260 | return; |
| 1248 | } |
1261 | } |
| 1249 | /* Check whether linking to the same file system instance. */ |
1262 | /* Check whether linking to the same file system instance. */ |
| 1250 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
1263 | if ((old_node->fs_handle != new_par_lr.triplet.fs_handle) || |
| 1251 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
1264 | (old_node->dev_handle != new_par_lr.triplet.dev_handle)) { |
| 1252 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1265 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1253 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
1266 | ipc_answer_0(rid, EXDEV); /* different file systems */ |
| 1254 | free(old); |
1267 | free(old); |
| 1255 | free(new); |
1268 | free(new); |
| 1256 | return; |
1269 | return; |
| 1257 | } |
1270 | } |
| 1258 | /* Destroy the old link for the new name. */ |
1271 | /* Destroy the old link for the new name. */ |
| 1259 | vfs_node_t *new_node = NULL; |
1272 | vfs_node_t *new_node = NULL; |
| 1260 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
1273 | rc = vfs_lookup_internal(newc, L_UNLINK, &new_lr, NULL); |
| 1261 | switch (rc) { |
1274 | switch (rc) { |
| 1262 | case ENOENT: |
1275 | case ENOENT: |
| 1263 | /* simply not in our way */ |
1276 | /* simply not in our way */ |
| 1264 | break; |
1277 | break; |
| 1265 | case EOK: |
1278 | case EOK: |
| 1266 | new_node = vfs_node_get(&new_lr); |
1279 | new_node = vfs_node_get(&new_lr); |
| 1267 | if (!new_node) { |
1280 | if (!new_node) { |
| 1268 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1281 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1269 | ipc_answer_0(rid, ENOMEM); |
1282 | ipc_answer_0(rid, ENOMEM); |
| 1270 | free(old); |
1283 | free(old); |
| 1271 | free(new); |
1284 | free(new); |
| 1272 | return; |
1285 | return; |
| 1273 | } |
1286 | } |
| 1274 | futex_down(&nodes_futex); |
1287 | futex_down(&nodes_futex); |
| 1275 | new_node->lnkcnt--; |
1288 | new_node->lnkcnt--; |
| 1276 | futex_up(&nodes_futex); |
1289 | futex_up(&nodes_futex); |
| 1277 | break; |
1290 | break; |
| 1278 | default: |
1291 | default: |
| 1279 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1292 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1280 | ipc_answer_0(rid, ENOTEMPTY); |
1293 | ipc_answer_0(rid, ENOTEMPTY); |
| 1281 | free(old); |
1294 | free(old); |
| 1282 | free(new); |
1295 | free(new); |
| 1283 | return; |
1296 | return; |
| 1284 | } |
1297 | } |
| 1285 | /* Create the new link for the new name. */ |
1298 | /* Create the new link for the new name. */ |
| 1286 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
1299 | rc = vfs_lookup_internal(newc, L_LINK, NULL, NULL, old_node->index); |
| 1287 | if (rc != EOK) { |
1300 | if (rc != EOK) { |
| 1288 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1301 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1289 | if (new_node) |
1302 | if (new_node) |
| 1290 | vfs_node_put(new_node); |
1303 | vfs_node_put(new_node); |
| 1291 | ipc_answer_0(rid, rc); |
1304 | ipc_answer_0(rid, rc); |
| 1292 | free(old); |
1305 | free(old); |
| 1293 | free(new); |
1306 | free(new); |
| 1294 | return; |
1307 | return; |
| 1295 | } |
1308 | } |
| 1296 | futex_down(&nodes_futex); |
1309 | futex_down(&nodes_futex); |
| 1297 | old_node->lnkcnt++; |
1310 | old_node->lnkcnt++; |
| 1298 | futex_up(&nodes_futex); |
1311 | futex_up(&nodes_futex); |
| 1299 | /* Destroy the link for the old name. */ |
1312 | /* Destroy the link for the old name. */ |
| 1300 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
1313 | rc = vfs_lookup_internal(oldc, L_UNLINK, NULL, NULL); |
| 1301 | if (rc != EOK) { |
1314 | if (rc != EOK) { |
| 1302 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1315 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1303 | vfs_node_put(old_node); |
1316 | vfs_node_put(old_node); |
| 1304 | if (new_node) |
1317 | if (new_node) |
| 1305 | vfs_node_put(new_node); |
1318 | vfs_node_put(new_node); |
| 1306 | ipc_answer_0(rid, rc); |
1319 | ipc_answer_0(rid, rc); |
| 1307 | free(old); |
1320 | free(old); |
| 1308 | free(new); |
1321 | free(new); |
| 1309 | return; |
1322 | return; |
| 1310 | } |
1323 | } |
| 1311 | futex_down(&nodes_futex); |
1324 | futex_down(&nodes_futex); |
| 1312 | old_node->lnkcnt--; |
1325 | old_node->lnkcnt--; |
| 1313 | futex_up(&nodes_futex); |
1326 | futex_up(&nodes_futex); |
| 1314 | fibril_rwlock_write_unlock(&namespace_rwlock); |
1327 | fibril_rwlock_write_unlock(&namespace_rwlock); |
| 1315 | vfs_node_put(old_node); |
1328 | vfs_node_put(old_node); |
| 1316 | if (new_node) |
1329 | if (new_node) |
| 1317 | vfs_node_put(new_node); |
1330 | vfs_node_put(new_node); |
| 1318 | free(old); |
1331 | free(old); |
| 1319 | free(new); |
1332 | free(new); |
| 1320 | ipc_answer_0(rid, EOK); |
1333 | ipc_answer_0(rid, EOK); |
| 1321 | } |
1334 | } |
| 1322 | 1335 | ||
| 1323 | /** |
1336 | /** |
| 1324 | * @} |
1337 | * @} |
| 1325 | */ |
1338 | */ |
| 1326 | 1339 | ||