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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 tmpfs_ops.c |
34 | * @file tmpfs_ops.c |
35 | * @brief Implementation of VFS operations for the TMPFS file system |
35 | * @brief Implementation of VFS operations for the TMPFS file system |
36 | * server. |
36 | * server. |
37 | */ |
37 | */ |
38 | 38 | ||
39 | #include "tmpfs.h" |
39 | #include "tmpfs.h" |
40 | #include "../../vfs/vfs.h" |
40 | #include "../../vfs/vfs.h" |
41 | #include <ipc/ipc.h> |
41 | #include <ipc/ipc.h> |
42 | #include <async.h> |
42 | #include <async.h> |
43 | #include <errno.h> |
43 | #include <errno.h> |
44 | #include <atomic.h> |
44 | #include <atomic.h> |
45 | #include <stdlib.h> |
45 | #include <stdlib.h> |
46 | #include <string.h> |
46 | #include <string.h> |
47 | #include <stdio.h> |
47 | #include <stdio.h> |
48 | #include <assert.h> |
48 | #include <assert.h> |
49 | #include <sys/types.h> |
49 | #include <sys/types.h> |
50 | #include <libadt/hash_table.h> |
50 | #include <libadt/hash_table.h> |
51 | #include <as.h> |
51 | #include <as.h> |
52 | #include <libfs.h> |
52 | #include <libfs.h> |
53 | 53 | ||
54 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
54 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
55 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
55 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
56 | 56 | ||
57 | #define DENTRIES_BUCKETS 256 |
57 | #define DENTRIES_BUCKETS 256 |
58 | 58 | ||
59 | /* |
59 | /* |
60 | * For now, we don't distinguish between different dev_handles/instances. All |
60 | * For now, we don't distinguish between different dev_handles/instances. All |
61 | * requests resolve to the only instance, rooted in the following variable. |
61 | * requests resolve to the only instance, rooted in the following variable. |
62 | */ |
62 | */ |
63 | static tmpfs_dentry_t *root; |
63 | static tmpfs_dentry_t *root; |
64 | 64 | ||
65 | /* |
65 | /* |
66 | * Implementation of the libfs interface. |
66 | * Implementation of the libfs interface. |
67 | */ |
67 | */ |
68 | 68 | ||
69 | /* Forward declarations of static functions. */ |
69 | /* Forward declarations of static functions. */ |
70 | static bool tmpfs_match(void *, const char *); |
70 | static bool tmpfs_match(void *, const char *); |
71 | static void *tmpfs_create_node(int); |
71 | static void *tmpfs_create_node(int); |
72 | static bool tmpfs_link_node(void *, void *, const char *); |
72 | static bool tmpfs_link_node(void *, void *, const char *); |
73 | static int tmpfs_unlink_node(void *); |
73 | static int tmpfs_unlink_node(void *); |
74 | static void tmpfs_destroy_node(void *); |
74 | static void tmpfs_destroy_node(void *); |
75 | 75 | ||
76 | /* Implementation of helper functions. */ |
76 | /* Implementation of helper functions. */ |
77 | static unsigned long tmpfs_index_get(void *nodep) |
77 | static unsigned long tmpfs_index_get(void *nodep) |
78 | { |
78 | { |
79 | return ((tmpfs_dentry_t *) nodep)->index; |
79 | return ((tmpfs_dentry_t *) nodep)->index; |
80 | } |
80 | } |
81 | 81 | ||
82 | static unsigned long tmpfs_size_get(void *nodep) |
82 | static unsigned long tmpfs_size_get(void *nodep) |
83 | { |
83 | { |
84 | return ((tmpfs_dentry_t *) nodep)->size; |
84 | return ((tmpfs_dentry_t *) nodep)->size; |
85 | } |
85 | } |
86 | 86 | ||
87 | static unsigned tmpfs_lnkcnt_get(void *nodep) |
87 | static unsigned tmpfs_lnkcnt_get(void *nodep) |
88 | { |
88 | { |
89 | return ((tmpfs_dentry_t *) nodep)->lnkcnt; |
89 | return ((tmpfs_dentry_t *) nodep)->lnkcnt; |
90 | } |
90 | } |
91 | 91 | ||
92 | static void *tmpfs_child_get(void *nodep) |
92 | static void *tmpfs_child_get(void *nodep) |
93 | { |
93 | { |
94 | return ((tmpfs_dentry_t *) nodep)->child; |
94 | return ((tmpfs_dentry_t *) nodep)->child; |
95 | } |
95 | } |
96 | 96 | ||
97 | static void *tmpfs_sibling_get(void *nodep) |
97 | static void *tmpfs_sibling_get(void *nodep) |
98 | { |
98 | { |
99 | return ((tmpfs_dentry_t *) nodep)->sibling; |
99 | return ((tmpfs_dentry_t *) nodep)->sibling; |
100 | } |
100 | } |
101 | 101 | ||
102 | static void *tmpfs_root_get(void) |
102 | static void *tmpfs_root_get(void) |
103 | { |
103 | { |
104 | return root; |
104 | return root; |
105 | } |
105 | } |
106 | 106 | ||
107 | static char tmpfs_plb_get_char(unsigned pos) |
107 | static char tmpfs_plb_get_char(unsigned pos) |
108 | { |
108 | { |
109 | return tmpfs_reg.plb_ro[pos % PLB_SIZE]; |
109 | return tmpfs_reg.plb_ro[pos % PLB_SIZE]; |
110 | } |
110 | } |
111 | 111 | ||
112 | static bool tmpfs_is_directory(void *nodep) |
112 | static bool tmpfs_is_directory(void *nodep) |
113 | { |
113 | { |
114 | return ((tmpfs_dentry_t *) nodep)->type == TMPFS_DIRECTORY; |
114 | return ((tmpfs_dentry_t *) nodep)->type == TMPFS_DIRECTORY; |
115 | } |
115 | } |
116 | 116 | ||
117 | static bool tmpfs_is_file(void *nodep) |
117 | static bool tmpfs_is_file(void *nodep) |
118 | { |
118 | { |
119 | return ((tmpfs_dentry_t *) nodep)->type == TMPFS_FILE; |
119 | return ((tmpfs_dentry_t *) nodep)->type == TMPFS_FILE; |
120 | } |
120 | } |
121 | 121 | ||
122 | /** libfs operations */ |
122 | /** libfs operations */ |
123 | libfs_ops_t tmpfs_libfs_ops = { |
123 | libfs_ops_t tmpfs_libfs_ops = { |
124 | .match = tmpfs_match, |
124 | .match = tmpfs_match, |
125 | .create = tmpfs_create_node, |
125 | .create = tmpfs_create_node, |
126 | .destroy = tmpfs_destroy_node, |
126 | .destroy = tmpfs_destroy_node, |
127 | .link = tmpfs_link_node, |
127 | .link = tmpfs_link_node, |
128 | .unlink = tmpfs_unlink_node, |
128 | .unlink = tmpfs_unlink_node, |
129 | .index_get = tmpfs_index_get, |
129 | .index_get = tmpfs_index_get, |
130 | .size_get = tmpfs_size_get, |
130 | .size_get = tmpfs_size_get, |
131 | .lnkcnt_get = tmpfs_lnkcnt_get, |
131 | .lnkcnt_get = tmpfs_lnkcnt_get, |
132 | .child_get = tmpfs_child_get, |
132 | .child_get = tmpfs_child_get, |
133 | .sibling_get = tmpfs_sibling_get, |
133 | .sibling_get = tmpfs_sibling_get, |
134 | .root_get = tmpfs_root_get, |
134 | .root_get = tmpfs_root_get, |
135 | .plb_get_char = tmpfs_plb_get_char, |
135 | .plb_get_char = tmpfs_plb_get_char, |
136 | .is_directory = tmpfs_is_directory, |
136 | .is_directory = tmpfs_is_directory, |
137 | .is_file = tmpfs_is_file |
137 | .is_file = tmpfs_is_file |
138 | }; |
138 | }; |
139 | 139 | ||
140 | /** Hash table of all directory entries. */ |
140 | /** Hash table of all directory entries. */ |
141 | hash_table_t dentries; |
141 | hash_table_t dentries; |
142 | 142 | ||
143 | /* Implementation of hash table interface. */ |
143 | /* Implementation of hash table interface. */ |
144 | static hash_index_t dentries_hash(unsigned long *key) |
144 | static hash_index_t dentries_hash(unsigned long *key) |
145 | { |
145 | { |
146 | return *key % DENTRIES_BUCKETS; |
146 | return *key % DENTRIES_BUCKETS; |
147 | } |
147 | } |
148 | 148 | ||
149 | static int dentries_compare(unsigned long *key, hash_count_t keys, |
149 | static int dentries_compare(unsigned long *key, hash_count_t keys, |
150 | link_t *item) |
150 | link_t *item) |
151 | { |
151 | { |
152 | tmpfs_dentry_t *dentry = hash_table_get_instance(item, tmpfs_dentry_t, |
152 | tmpfs_dentry_t *dentry = hash_table_get_instance(item, tmpfs_dentry_t, |
153 | dh_link); |
153 | dh_link); |
154 | return dentry->index == *key; |
154 | return dentry->index == *key; |
155 | } |
155 | } |
156 | 156 | ||
157 | static void dentries_remove_callback(link_t *item) |
157 | static void dentries_remove_callback(link_t *item) |
158 | { |
158 | { |
159 | } |
159 | } |
160 | 160 | ||
161 | /** TMPFS dentries hash table operations. */ |
161 | /** TMPFS dentries hash table operations. */ |
162 | hash_table_operations_t dentries_ops = { |
162 | hash_table_operations_t dentries_ops = { |
163 | .hash = dentries_hash, |
163 | .hash = dentries_hash, |
164 | .compare = dentries_compare, |
164 | .compare = dentries_compare, |
165 | .remove_callback = dentries_remove_callback |
165 | .remove_callback = dentries_remove_callback |
166 | }; |
166 | }; |
167 | 167 | ||
168 | unsigned tmpfs_next_index = 1; |
168 | unsigned tmpfs_next_index = 1; |
169 | 169 | ||
170 | static void tmpfs_dentry_initialize(tmpfs_dentry_t *dentry) |
170 | static void tmpfs_dentry_initialize(tmpfs_dentry_t *dentry) |
171 | { |
171 | { |
172 | dentry->index = 0; |
172 | dentry->index = 0; |
173 | dentry->parent = NULL; |
173 | dentry->parent = NULL; |
174 | dentry->sibling = NULL; |
174 | dentry->sibling = NULL; |
175 | dentry->child = NULL; |
175 | dentry->child = NULL; |
176 | dentry->name = NULL; |
176 | dentry->name = NULL; |
177 | dentry->type = TMPFS_NONE; |
177 | dentry->type = TMPFS_NONE; |
178 | dentry->lnkcnt = 0; |
178 | dentry->lnkcnt = 0; |
179 | dentry->size = 0; |
179 | dentry->size = 0; |
180 | dentry->data = NULL; |
180 | dentry->data = NULL; |
181 | link_initialize(&dentry->dh_link); |
181 | link_initialize(&dentry->dh_link); |
182 | } |
182 | } |
183 | 183 | ||
184 | static bool tmpfs_init(void) |
184 | static bool tmpfs_init(void) |
185 | { |
185 | { |
186 | if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 1, &dentries_ops)) |
186 | if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 1, &dentries_ops)) |
187 | return false; |
187 | return false; |
188 | root = (tmpfs_dentry_t *) tmpfs_create_node(L_DIRECTORY); |
188 | root = (tmpfs_dentry_t *) tmpfs_create_node(L_DIRECTORY); |
- | 189 | root->lnkcnt = 1; |
|
189 | return root != NULL; |
190 | return root != NULL; |
190 | } |
191 | } |
191 | 192 | ||
192 | /** Compare one component of path to a directory entry. |
193 | /** Compare one component of path to a directory entry. |
193 | * |
194 | * |
194 | * @param nodep Node to compare the path component with. |
195 | * @param nodep Node to compare the path component with. |
195 | * @param component Array of characters holding component name. |
196 | * @param component Array of characters holding component name. |
196 | * |
197 | * |
197 | * @return True on match, false otherwise. |
198 | * @return True on match, false otherwise. |
198 | */ |
199 | */ |
199 | bool tmpfs_match(void *nodep, const char *component) |
200 | bool tmpfs_match(void *nodep, const char *component) |
200 | { |
201 | { |
201 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
202 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
202 | 203 | ||
203 | return !strcmp(dentry->name, component); |
204 | return !strcmp(dentry->name, component); |
204 | } |
205 | } |
205 | 206 | ||
206 | void *tmpfs_create_node(int lflag) |
207 | void *tmpfs_create_node(int lflag) |
207 | { |
208 | { |
208 | assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY)); |
209 | assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY)); |
209 | 210 | ||
210 | tmpfs_dentry_t *node = malloc(sizeof(tmpfs_dentry_t)); |
211 | tmpfs_dentry_t *node = malloc(sizeof(tmpfs_dentry_t)); |
211 | if (!node) |
212 | if (!node) |
212 | return NULL; |
213 | return NULL; |
213 | 214 | ||
214 | tmpfs_dentry_initialize(node); |
215 | tmpfs_dentry_initialize(node); |
215 | node->index = tmpfs_next_index++; |
216 | node->index = tmpfs_next_index++; |
216 | if (lflag & L_DIRECTORY) |
217 | if (lflag & L_DIRECTORY) |
217 | node->type = TMPFS_DIRECTORY; |
218 | node->type = TMPFS_DIRECTORY; |
218 | else |
219 | else |
219 | node->type = TMPFS_FILE; |
220 | node->type = TMPFS_FILE; |
220 | 221 | ||
221 | /* Insert the new node into the dentry hash table. */ |
222 | /* Insert the new node into the dentry hash table. */ |
222 | hash_table_insert(&dentries, &node->index, &node->dh_link); |
223 | hash_table_insert(&dentries, &node->index, &node->dh_link); |
223 | return (void *) node; |
224 | return (void *) node; |
224 | } |
225 | } |
225 | 226 | ||
226 | bool tmpfs_link_node(void *prnt, void *chld, const char *nm) |
227 | bool tmpfs_link_node(void *prnt, void *chld, const char *nm) |
227 | { |
228 | { |
228 | tmpfs_dentry_t *parentp = (tmpfs_dentry_t *) prnt; |
229 | tmpfs_dentry_t *parentp = (tmpfs_dentry_t *) prnt; |
229 | tmpfs_dentry_t *childp = (tmpfs_dentry_t *) chld; |
230 | tmpfs_dentry_t *childp = (tmpfs_dentry_t *) chld; |
230 | 231 | ||
231 | assert(parentp->type == TMPFS_DIRECTORY); |
232 | assert(parentp->type == TMPFS_DIRECTORY); |
232 | 233 | ||
233 | size_t len = strlen(nm); |
234 | size_t len = strlen(nm); |
234 | char *name = malloc(len + 1); |
235 | char *name = malloc(len + 1); |
235 | if (!name) |
236 | if (!name) |
236 | return false; |
237 | return false; |
237 | 238 | ||
238 | childp->lnkcnt++; |
239 | childp->lnkcnt++; |
239 | 240 | ||
240 | strcpy(name, nm); |
241 | strcpy(name, nm); |
241 | childp->name = name; |
242 | childp->name = name; |
242 | 243 | ||
243 | /* Insert the new node into the namespace. */ |
244 | /* Insert the new node into the namespace. */ |
244 | if (parentp->child) { |
245 | if (parentp->child) { |
245 | tmpfs_dentry_t *tmp = parentp->child; |
246 | tmpfs_dentry_t *tmp = parentp->child; |
246 | while (tmp->sibling) |
247 | while (tmp->sibling) |
247 | tmp = tmp->sibling; |
248 | tmp = tmp->sibling; |
248 | tmp->sibling = childp; |
249 | tmp->sibling = childp; |
249 | } else { |
250 | } else { |
250 | parentp->child = childp; |
251 | parentp->child = childp; |
251 | } |
252 | } |
252 | childp->parent = parentp; |
253 | childp->parent = parentp; |
253 | 254 | ||
254 | return true; |
255 | return true; |
255 | } |
256 | } |
256 | 257 | ||
257 | int tmpfs_unlink_node(void *nodeptr) |
258 | int tmpfs_unlink_node(void *nodeptr) |
258 | { |
259 | { |
259 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *)nodeptr; |
260 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *)nodeptr; |
260 | 261 | ||
261 | if (dentry->child) |
262 | if (dentry->child) |
262 | return ENOTEMPTY; |
263 | return ENOTEMPTY; |
263 | 264 | ||
264 | if (!dentry->parent) |
265 | if (!dentry->parent) |
265 | return EBUSY; |
266 | return EBUSY; |
266 | 267 | ||
267 | if (dentry->parent->child == dentry) { |
268 | if (dentry->parent->child == dentry) { |
268 | dentry->parent->child = dentry->sibling; |
269 | dentry->parent->child = dentry->sibling; |
269 | } else { |
270 | } else { |
270 | /* TODO: consider doubly linked list for organizing siblings. */ |
271 | /* TODO: consider doubly linked list for organizing siblings. */ |
271 | tmpfs_dentry_t *tmp = dentry->parent->child; |
272 | tmpfs_dentry_t *tmp = dentry->parent->child; |
272 | while (tmp->sibling != dentry) |
273 | while (tmp->sibling != dentry) |
273 | tmp = tmp->sibling; |
274 | tmp = tmp->sibling; |
274 | tmp->sibling = dentry->sibling; |
275 | tmp->sibling = dentry->sibling; |
275 | } |
276 | } |
276 | dentry->sibling = NULL; |
277 | dentry->sibling = NULL; |
277 | dentry->parent = NULL; |
278 | dentry->parent = NULL; |
278 | 279 | ||
279 | free(dentry->name); |
280 | free(dentry->name); |
280 | dentry->name = NULL; |
281 | dentry->name = NULL; |
281 | 282 | ||
282 | dentry->lnkcnt--; |
283 | dentry->lnkcnt--; |
283 | 284 | ||
284 | return EOK; |
285 | return EOK; |
285 | } |
286 | } |
286 | 287 | ||
287 | void tmpfs_destroy_node(void *nodep) |
288 | void tmpfs_destroy_node(void *nodep) |
288 | { |
289 | { |
289 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
290 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
290 | 291 | ||
291 | assert(!dentry->lnkcnt); |
292 | assert(!dentry->lnkcnt); |
292 | assert(!dentry->child); |
293 | assert(!dentry->child); |
293 | assert(!dentry->sibling); |
294 | assert(!dentry->sibling); |
294 | 295 | ||
295 | unsigned long index = dentry->index; |
296 | unsigned long index = dentry->index; |
296 | hash_table_remove(&dentries, &index, 1); |
297 | hash_table_remove(&dentries, &index, 1); |
297 | 298 | ||
298 | if (dentry->type == TMPFS_FILE) |
299 | if (dentry->type == TMPFS_FILE) |
299 | free(dentry->data); |
300 | free(dentry->data); |
300 | free(dentry); |
301 | free(dentry); |
301 | } |
302 | } |
302 | 303 | ||
303 | void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request) |
304 | void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request) |
304 | { |
305 | { |
305 | /* Initialize TMPFS. */ |
306 | /* Initialize TMPFS. */ |
306 | if (!root && !tmpfs_init()) { |
307 | if (!root && !tmpfs_init()) { |
307 | ipc_answer_0(rid, ENOMEM); |
308 | ipc_answer_0(rid, ENOMEM); |
308 | return; |
309 | return; |
309 | } |
310 | } |
310 | libfs_lookup(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request); |
311 | libfs_lookup(&tmpfs_libfs_ops, tmpfs_reg.fs_handle, rid, request); |
311 | } |
312 | } |
312 | 313 | ||
313 | void tmpfs_read(ipc_callid_t rid, ipc_call_t *request) |
314 | void tmpfs_read(ipc_callid_t rid, ipc_call_t *request) |
314 | { |
315 | { |
315 | int dev_handle = IPC_GET_ARG1(*request); |
316 | int dev_handle = IPC_GET_ARG1(*request); |
316 | unsigned long index = IPC_GET_ARG2(*request); |
317 | unsigned long index = IPC_GET_ARG2(*request); |
317 | off_t pos = IPC_GET_ARG3(*request); |
318 | off_t pos = IPC_GET_ARG3(*request); |
318 | 319 | ||
319 | /* |
320 | /* |
320 | * Lookup the respective dentry. |
321 | * Lookup the respective dentry. |
321 | */ |
322 | */ |
322 | link_t *hlp; |
323 | link_t *hlp; |
323 | hlp = hash_table_find(&dentries, &index); |
324 | hlp = hash_table_find(&dentries, &index); |
324 | if (!hlp) { |
325 | if (!hlp) { |
325 | ipc_answer_0(rid, ENOENT); |
326 | ipc_answer_0(rid, ENOENT); |
326 | return; |
327 | return; |
327 | } |
328 | } |
328 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
329 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
329 | dh_link); |
330 | dh_link); |
330 | 331 | ||
331 | /* |
332 | /* |
332 | * Receive the read request. |
333 | * Receive the read request. |
333 | */ |
334 | */ |
334 | ipc_callid_t callid; |
335 | ipc_callid_t callid; |
335 | size_t len; |
336 | size_t len; |
336 | if (!ipc_data_read_receive(&callid, &len)) { |
337 | if (!ipc_data_read_receive(&callid, &len)) { |
337 | ipc_answer_0(callid, EINVAL); |
338 | ipc_answer_0(callid, EINVAL); |
338 | ipc_answer_0(rid, EINVAL); |
339 | ipc_answer_0(rid, EINVAL); |
339 | return; |
340 | return; |
340 | } |
341 | } |
341 | 342 | ||
342 | size_t bytes; |
343 | size_t bytes; |
343 | if (dentry->type == TMPFS_FILE) { |
344 | if (dentry->type == TMPFS_FILE) { |
344 | bytes = max(0, min(dentry->size - pos, len)); |
345 | bytes = max(0, min(dentry->size - pos, len)); |
345 | (void) ipc_data_read_finalize(callid, dentry->data + pos, |
346 | (void) ipc_data_read_finalize(callid, dentry->data + pos, |
346 | bytes); |
347 | bytes); |
347 | } else { |
348 | } else { |
348 | int i; |
349 | int i; |
349 | tmpfs_dentry_t *cur; |
350 | tmpfs_dentry_t *cur; |
350 | 351 | ||
351 | assert(dentry->type == TMPFS_DIRECTORY); |
352 | assert(dentry->type == TMPFS_DIRECTORY); |
352 | 353 | ||
353 | /* |
354 | /* |
354 | * Yes, we really use O(n) algorithm here. |
355 | * Yes, we really use O(n) algorithm here. |
355 | * If it bothers someone, it could be fixed by introducing a |
356 | * If it bothers someone, it could be fixed by introducing a |
356 | * hash table. |
357 | * hash table. |
357 | */ |
358 | */ |
358 | for (i = 0, cur = dentry->child; i < pos && cur; i++, |
359 | for (i = 0, cur = dentry->child; i < pos && cur; i++, |
359 | cur = cur->sibling) |
360 | cur = cur->sibling) |
360 | ; |
361 | ; |
361 | 362 | ||
362 | if (!cur) { |
363 | if (!cur) { |
363 | ipc_answer_0(callid, ENOENT); |
364 | ipc_answer_0(callid, ENOENT); |
364 | ipc_answer_1(rid, ENOENT, 0); |
365 | ipc_answer_1(rid, ENOENT, 0); |
365 | return; |
366 | return; |
366 | } |
367 | } |
367 | 368 | ||
368 | (void) ipc_data_read_finalize(callid, cur->name, |
369 | (void) ipc_data_read_finalize(callid, cur->name, |
369 | strlen(cur->name) + 1); |
370 | strlen(cur->name) + 1); |
370 | bytes = 1; |
371 | bytes = 1; |
371 | } |
372 | } |
372 | 373 | ||
373 | /* |
374 | /* |
374 | * Answer the VFS_READ call. |
375 | * Answer the VFS_READ call. |
375 | */ |
376 | */ |
376 | ipc_answer_1(rid, EOK, bytes); |
377 | ipc_answer_1(rid, EOK, bytes); |
377 | } |
378 | } |
378 | 379 | ||
379 | void tmpfs_write(ipc_callid_t rid, ipc_call_t *request) |
380 | void tmpfs_write(ipc_callid_t rid, ipc_call_t *request) |
380 | { |
381 | { |
381 | int dev_handle = IPC_GET_ARG1(*request); |
382 | int dev_handle = IPC_GET_ARG1(*request); |
382 | unsigned long index = IPC_GET_ARG2(*request); |
383 | unsigned long index = IPC_GET_ARG2(*request); |
383 | off_t pos = IPC_GET_ARG3(*request); |
384 | off_t pos = IPC_GET_ARG3(*request); |
384 | 385 | ||
385 | /* |
386 | /* |
386 | * Lookup the respective dentry. |
387 | * Lookup the respective dentry. |
387 | */ |
388 | */ |
388 | link_t *hlp; |
389 | link_t *hlp; |
389 | hlp = hash_table_find(&dentries, &index); |
390 | hlp = hash_table_find(&dentries, &index); |
390 | if (!hlp) { |
391 | if (!hlp) { |
391 | ipc_answer_0(rid, ENOENT); |
392 | ipc_answer_0(rid, ENOENT); |
392 | return; |
393 | return; |
393 | } |
394 | } |
394 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
395 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
395 | dh_link); |
396 | dh_link); |
396 | 397 | ||
397 | /* |
398 | /* |
398 | * Receive the write request. |
399 | * Receive the write request. |
399 | */ |
400 | */ |
400 | ipc_callid_t callid; |
401 | ipc_callid_t callid; |
401 | size_t len; |
402 | size_t len; |
402 | if (!ipc_data_write_receive(&callid, &len)) { |
403 | if (!ipc_data_write_receive(&callid, &len)) { |
403 | ipc_answer_0(callid, EINVAL); |
404 | ipc_answer_0(callid, EINVAL); |
404 | ipc_answer_0(rid, EINVAL); |
405 | ipc_answer_0(rid, EINVAL); |
405 | return; |
406 | return; |
406 | } |
407 | } |
407 | 408 | ||
408 | /* |
409 | /* |
409 | * Check whether the file needs to grow. |
410 | * Check whether the file needs to grow. |
410 | */ |
411 | */ |
411 | if (pos + len <= dentry->size) { |
412 | if (pos + len <= dentry->size) { |
412 | /* The file size is not changing. */ |
413 | /* The file size is not changing. */ |
413 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
414 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
414 | ipc_answer_2(rid, EOK, len, dentry->size); |
415 | ipc_answer_2(rid, EOK, len, dentry->size); |
415 | return; |
416 | return; |
416 | } |
417 | } |
417 | size_t delta = (pos + len) - dentry->size; |
418 | size_t delta = (pos + len) - dentry->size; |
418 | /* |
419 | /* |
419 | * At this point, we are deliberately extremely straightforward and |
420 | * At this point, we are deliberately extremely straightforward and |
420 | * simply realloc the contents of the file on every write that grows the |
421 | * simply realloc the contents of the file on every write that grows the |
421 | * file. In the end, the situation might not be as bad as it may look: |
422 | * file. In the end, the situation might not be as bad as it may look: |
422 | * our heap allocator can save us and just grow the block whenever |
423 | * our heap allocator can save us and just grow the block whenever |
423 | * possible. |
424 | * possible. |
424 | */ |
425 | */ |
425 | void *newdata = realloc(dentry->data, dentry->size + delta); |
426 | void *newdata = realloc(dentry->data, dentry->size + delta); |
426 | if (!newdata) { |
427 | if (!newdata) { |
427 | ipc_answer_0(callid, ENOMEM); |
428 | ipc_answer_0(callid, ENOMEM); |
428 | ipc_answer_2(rid, EOK, 0, dentry->size); |
429 | ipc_answer_2(rid, EOK, 0, dentry->size); |
429 | return; |
430 | return; |
430 | } |
431 | } |
431 | /* Clear any newly allocated memory in order to emulate gaps. */ |
432 | /* Clear any newly allocated memory in order to emulate gaps. */ |
432 | memset(newdata + dentry->size, 0, delta); |
433 | memset(newdata + dentry->size, 0, delta); |
433 | dentry->size += delta; |
434 | dentry->size += delta; |
434 | dentry->data = newdata; |
435 | dentry->data = newdata; |
435 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
436 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
436 | ipc_answer_2(rid, EOK, len, dentry->size); |
437 | ipc_answer_2(rid, EOK, len, dentry->size); |
437 | } |
438 | } |
438 | 439 | ||
439 | void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
440 | void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
440 | { |
441 | { |
441 | int dev_handle = IPC_GET_ARG1(*request); |
442 | int dev_handle = IPC_GET_ARG1(*request); |
442 | unsigned long index = IPC_GET_ARG2(*request); |
443 | unsigned long index = IPC_GET_ARG2(*request); |
443 | size_t size = IPC_GET_ARG3(*request); |
444 | size_t size = IPC_GET_ARG3(*request); |
444 | 445 | ||
445 | /* |
446 | /* |
446 | * Lookup the respective dentry. |
447 | * Lookup the respective dentry. |
447 | */ |
448 | */ |
448 | link_t *hlp; |
449 | link_t *hlp; |
449 | hlp = hash_table_find(&dentries, &index); |
450 | hlp = hash_table_find(&dentries, &index); |
450 | if (!hlp) { |
451 | if (!hlp) { |
451 | ipc_answer_0(rid, ENOENT); |
452 | ipc_answer_0(rid, ENOENT); |
452 | return; |
453 | return; |
453 | } |
454 | } |
454 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
455 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
455 | dh_link); |
456 | dh_link); |
456 | 457 | ||
457 | if (size == dentry->size) { |
458 | if (size == dentry->size) { |
458 | ipc_answer_0(rid, EOK); |
459 | ipc_answer_0(rid, EOK); |
459 | return; |
460 | return; |
460 | } |
461 | } |
461 | 462 | ||
462 | void *newdata = realloc(dentry->data, size); |
463 | void *newdata = realloc(dentry->data, size); |
463 | if (!newdata) { |
464 | if (!newdata) { |
464 | ipc_answer_0(rid, ENOMEM); |
465 | ipc_answer_0(rid, ENOMEM); |
465 | return; |
466 | return; |
466 | } |
467 | } |
467 | if (size > dentry->size) { |
468 | if (size > dentry->size) { |
468 | size_t delta = size - dentry->size; |
469 | size_t delta = size - dentry->size; |
469 | memset(newdata + dentry->size, 0, delta); |
470 | memset(newdata + dentry->size, 0, delta); |
470 | } |
471 | } |
471 | dentry->size = size; |
472 | dentry->size = size; |
472 | dentry->data = newdata; |
473 | dentry->data = newdata; |
473 | ipc_answer_0(rid, EOK); |
474 | ipc_answer_0(rid, EOK); |
474 | } |
475 | } |
475 | 476 | ||
476 | void tmpfs_destroy(ipc_callid_t rid, ipc_call_t *request) |
477 | void tmpfs_destroy(ipc_callid_t rid, ipc_call_t *request) |
477 | { |
478 | { |
478 | int dev_handle = IPC_GET_ARG1(*request); |
479 | int dev_handle = IPC_GET_ARG1(*request); |
479 | unsigned long index = IPC_GET_ARG2(*request); |
480 | unsigned long index = IPC_GET_ARG2(*request); |
480 | 481 | ||
481 | link_t *hlp; |
482 | link_t *hlp; |
482 | hlp = hash_table_find(&dentries, &index); |
483 | hlp = hash_table_find(&dentries, &index); |
483 | if (!hlp) { |
484 | if (!hlp) { |
484 | ipc_answer_0(rid, ENOENT); |
485 | ipc_answer_0(rid, ENOENT); |
485 | return; |
486 | return; |
486 | } |
487 | } |
487 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
488 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
488 | dh_link); |
489 | dh_link); |
489 | tmpfs_destroy_node(dentry); |
490 | tmpfs_destroy_node(dentry); |
490 | ipc_answer_0(rid, EOK); |
491 | ipc_answer_0(rid, EOK); |
491 | } |
492 | } |
492 | 493 | ||
493 | /** |
494 | /** |
494 | * @} |
495 | * @} |
495 | */ |
496 | */ |
496 | 497 |