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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 <dirent.h> |
48 | #include <dirent.h> |
49 | #include <assert.h> |
49 | #include <assert.h> |
50 | #include <sys/types.h> |
50 | #include <sys/types.h> |
51 | #include <libadt/hash_table.h> |
51 | #include <libadt/hash_table.h> |
52 | #include <as.h> |
52 | #include <as.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 PLB_GET_CHAR(i) (tmpfs_reg.plb_ro[(i) % PLB_SIZE]) |
57 | #define PLB_GET_CHAR(i) (tmpfs_reg.plb_ro[(i) % PLB_SIZE]) |
58 | 58 | ||
59 | #define DENTRIES_BUCKETS 256 |
59 | #define DENTRIES_BUCKETS 256 |
60 | 60 | ||
61 | #define TMPFS_GET_INDEX(x) (((tmpfs_dentry_t *)(x))->index) |
61 | #define TMPFS_GET_INDEX(x) (((tmpfs_dentry_t *)(x))->index) |
62 | #define TMPFS_GET_LNKCNT(x) 1 |
62 | #define TMPFS_GET_LNKCNT(x) 1 |
63 | 63 | ||
64 | /* |
64 | /* |
65 | * Hash table of all directory entries. |
65 | * Hash table of all directory entries. |
66 | */ |
66 | */ |
67 | hash_table_t dentries; |
67 | hash_table_t dentries; |
68 | 68 | ||
69 | static hash_index_t dentries_hash(unsigned long *key) |
69 | static hash_index_t dentries_hash(unsigned long *key) |
70 | { |
70 | { |
71 | return *key % DENTRIES_BUCKETS; |
71 | return *key % DENTRIES_BUCKETS; |
72 | } |
72 | } |
73 | 73 | ||
74 | static int dentries_compare(unsigned long *key, hash_count_t keys, |
74 | static int dentries_compare(unsigned long *key, hash_count_t keys, |
75 | link_t *item) |
75 | link_t *item) |
76 | { |
76 | { |
77 | tmpfs_dentry_t *dentry = hash_table_get_instance(item, tmpfs_dentry_t, |
77 | tmpfs_dentry_t *dentry = hash_table_get_instance(item, tmpfs_dentry_t, |
78 | dh_link); |
78 | dh_link); |
79 | return dentry->index == *key; |
79 | return dentry->index == *key; |
80 | } |
80 | } |
81 | 81 | ||
82 | static void dentries_remove_callback(link_t *item) |
82 | static void dentries_remove_callback(link_t *item) |
83 | { |
83 | { |
84 | } |
84 | } |
85 | 85 | ||
86 | /** TMPFS dentries hash table operations. */ |
86 | /** TMPFS dentries hash table operations. */ |
87 | hash_table_operations_t dentries_ops = { |
87 | hash_table_operations_t dentries_ops = { |
88 | .hash = dentries_hash, |
88 | .hash = dentries_hash, |
89 | .compare = dentries_compare, |
89 | .compare = dentries_compare, |
90 | .remove_callback = dentries_remove_callback |
90 | .remove_callback = dentries_remove_callback |
91 | }; |
91 | }; |
92 | 92 | ||
93 | unsigned tmpfs_next_index = 1; |
93 | unsigned tmpfs_next_index = 1; |
94 | 94 | ||
95 | static void tmpfs_dentry_initialize(tmpfs_dentry_t *dentry) |
95 | static void tmpfs_dentry_initialize(tmpfs_dentry_t *dentry) |
96 | { |
96 | { |
97 | dentry->index = 0; |
97 | dentry->index = 0; |
98 | dentry->parent = NULL; |
98 | dentry->parent = NULL; |
99 | dentry->sibling = NULL; |
99 | dentry->sibling = NULL; |
100 | dentry->child = NULL; |
100 | dentry->child = NULL; |
101 | dentry->name = NULL; |
101 | dentry->name = NULL; |
102 | dentry->type = TMPFS_NONE; |
102 | dentry->type = TMPFS_NONE; |
103 | dentry->size = 0; |
103 | dentry->size = 0; |
104 | dentry->data = NULL; |
104 | dentry->data = NULL; |
105 | link_initialize(&dentry->dh_link); |
105 | link_initialize(&dentry->dh_link); |
106 | } |
106 | } |
107 | 107 | ||
108 | /* |
108 | /* |
109 | * For now, we don't distinguish between different dev_handles/instances. All |
109 | * For now, we don't distinguish between different dev_handles/instances. All |
110 | * requests resolve to the only instance, rooted in the following variable. |
110 | * requests resolve to the only instance, rooted in the following variable. |
111 | */ |
111 | */ |
112 | static tmpfs_dentry_t *root; |
112 | static tmpfs_dentry_t *root; |
113 | 113 | ||
114 | static bool tmpfs_init(void) |
114 | static bool tmpfs_init(void) |
115 | { |
115 | { |
116 | if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 1, &dentries_ops)) |
116 | if (!hash_table_create(&dentries, DENTRIES_BUCKETS, 1, &dentries_ops)) |
117 | return false; |
117 | return false; |
118 | 118 | ||
119 | root = (tmpfs_dentry_t *) malloc(sizeof(tmpfs_dentry_t)); |
119 | root = (tmpfs_dentry_t *) malloc(sizeof(tmpfs_dentry_t)); |
120 | if (!root) |
120 | if (!root) |
121 | return false; |
121 | return false; |
122 | tmpfs_dentry_initialize(root); |
122 | tmpfs_dentry_initialize(root); |
123 | root->index = tmpfs_next_index++; |
123 | root->index = tmpfs_next_index++; |
124 | root->name = ""; |
124 | root->name = ""; |
125 | root->type = TMPFS_DIRECTORY; |
125 | root->type = TMPFS_DIRECTORY; |
126 | hash_table_insert(&dentries, &root->index, &root->dh_link); |
126 | hash_table_insert(&dentries, &root->index, &root->dh_link); |
127 | 127 | ||
128 | return true; |
128 | return true; |
129 | } |
129 | } |
130 | 130 | ||
131 | /** Compare one component of path to a directory entry. |
131 | /** Compare one component of path to a directory entry. |
132 | * |
132 | * |
133 | * @param nodep Node to compare the path component with. |
133 | * @param nodep Node to compare the path component with. |
134 | * @param component Array of characters holding component name. |
134 | * @param component Array of characters holding component name. |
135 | * |
135 | * |
136 | * @return True on match, false otherwise. |
136 | * @return True on match, false otherwise. |
137 | */ |
137 | */ |
138 | static bool match_component(void *nodep, const char *component) |
138 | static bool match_component(void *nodep, const char *component) |
139 | { |
139 | { |
140 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
140 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
141 | 141 | ||
142 | return !strcmp(dentry->name, component); |
142 | return !strcmp(dentry->name, component); |
143 | } |
143 | } |
144 | 144 | ||
145 | static void *create_node(void *nodep, |
145 | static void *create_node(void *nodep, |
146 | const char *component, int lflag) |
146 | const char *component, int lflag) |
147 | { |
147 | { |
148 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
148 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *) nodep; |
149 | 149 | ||
150 | assert(dentry->type == TMPFS_DIRECTORY); |
150 | assert(dentry->type == TMPFS_DIRECTORY); |
151 | assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY)); |
151 | assert((lflag & L_FILE) ^ (lflag & L_DIRECTORY)); |
152 | 152 | ||
153 | tmpfs_dentry_t *node = malloc(sizeof(tmpfs_dentry_t)); |
153 | tmpfs_dentry_t *node = malloc(sizeof(tmpfs_dentry_t)); |
154 | if (!node) |
154 | if (!node) |
155 | return NULL; |
155 | return NULL; |
156 | size_t len = strlen(component); |
156 | size_t len = strlen(component); |
157 | char *name = malloc(len + 1); |
157 | char *name = malloc(len + 1); |
158 | if (!name) { |
158 | if (!name) { |
159 | free(node); |
159 | free(node); |
160 | return NULL; |
160 | return NULL; |
161 | } |
161 | } |
162 | strcpy(name, component); |
162 | strcpy(name, component); |
163 | 163 | ||
164 | tmpfs_dentry_initialize(node); |
164 | tmpfs_dentry_initialize(node); |
165 | node->index = tmpfs_next_index++; |
165 | node->index = tmpfs_next_index++; |
166 | node->name = name; |
166 | node->name = name; |
167 | node->parent = dentry; |
167 | node->parent = dentry; |
168 | if (lflag & L_DIRECTORY) |
168 | if (lflag & L_DIRECTORY) |
169 | node->type = TMPFS_DIRECTORY; |
169 | node->type = TMPFS_DIRECTORY; |
170 | else |
170 | else |
171 | node->type = TMPFS_FILE; |
171 | node->type = TMPFS_FILE; |
172 | 172 | ||
173 | /* Insert the new node into the namespace. */ |
173 | /* Insert the new node into the namespace. */ |
174 | if (dentry->child) { |
174 | if (dentry->child) { |
175 | tmpfs_dentry_t *tmp = dentry->child; |
175 | tmpfs_dentry_t *tmp = dentry->child; |
176 | while (tmp->sibling) |
176 | while (tmp->sibling) |
177 | tmp = tmp->sibling; |
177 | tmp = tmp->sibling; |
178 | tmp->sibling = node; |
178 | tmp->sibling = node; |
179 | } else { |
179 | } else { |
180 | dentry->child = node; |
180 | dentry->child = node; |
181 | } |
181 | } |
182 | 182 | ||
183 | /* Insert the new node into the dentry hash table. */ |
183 | /* Insert the new node into the dentry hash table. */ |
184 | hash_table_insert(&dentries, &node->index, &node->dh_link); |
184 | hash_table_insert(&dentries, &node->index, &node->dh_link); |
185 | return (void *) node; |
185 | return (void *) node; |
186 | } |
186 | } |
187 | 187 | ||
188 | static int destroy_component(void *nodeptr) |
188 | static int destroy_component(void *nodeptr) |
189 | { |
189 | { |
190 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *)nodeptr; |
190 | tmpfs_dentry_t *dentry = (tmpfs_dentry_t *)nodeptr; |
191 | 191 | ||
192 | if (dentry->child) |
192 | if (dentry->child) |
193 | return ENOTEMPTY; |
193 | return ENOTEMPTY; |
194 | 194 | ||
195 | if (!dentry->parent) |
195 | if (!dentry->parent) |
196 | return EBUSY; |
196 | return EBUSY; |
197 | 197 | ||
198 | if (dentry->parent->child == dentry) { |
198 | if (dentry->parent->child == dentry) { |
199 | dentry->parent->child = dentry->sibling; |
199 | dentry->parent->child = dentry->sibling; |
200 | } else { |
200 | } else { |
201 | /* TODO: consider doubly linked list for organizing siblings. */ |
201 | /* TODO: consider doubly linked list for organizing siblings. */ |
202 | tmpfs_dentry_t *tmp = dentry->parent->child; |
202 | tmpfs_dentry_t *tmp = dentry->parent->child; |
203 | while (tmp->sibling != dentry) |
203 | while (tmp->sibling != dentry) |
204 | tmp = tmp->sibling; |
204 | tmp = tmp->sibling; |
205 | tmp->sibling = dentry->sibling; |
205 | tmp->sibling = dentry->sibling; |
206 | } |
206 | } |
207 | dentry->sibling = NULL; |
207 | dentry->sibling = NULL; |
208 | dentry->parent = NULL; |
208 | dentry->parent = NULL; |
209 | 209 | ||
210 | return EOK; |
210 | return EOK; |
211 | } |
211 | } |
212 | 212 | ||
213 | void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request) |
213 | void tmpfs_lookup(ipc_callid_t rid, ipc_call_t *request) |
214 | { |
214 | { |
215 | unsigned next = IPC_GET_ARG1(*request); |
215 | unsigned next = IPC_GET_ARG1(*request); |
216 | unsigned last = IPC_GET_ARG2(*request); |
216 | unsigned last = IPC_GET_ARG2(*request); |
217 | int dev_handle = IPC_GET_ARG3(*request); |
217 | int dev_handle = IPC_GET_ARG3(*request); |
218 | int lflag = IPC_GET_ARG4(*request); |
218 | int lflag = IPC_GET_ARG4(*request); |
219 | 219 | ||
220 | if (last < next) |
220 | if (last < next) |
221 | last += PLB_SIZE; |
221 | last += PLB_SIZE; |
222 | 222 | ||
223 | /* |
223 | /* |
224 | * Initialize TMPFS. |
224 | * Initialize TMPFS. |
225 | */ |
225 | */ |
226 | if (!root && !tmpfs_init()) { |
226 | if (!root && !tmpfs_init()) { |
227 | ipc_answer_0(rid, ENOMEM); |
227 | ipc_answer_0(rid, ENOMEM); |
228 | return; |
228 | return; |
229 | } |
229 | } |
230 | 230 | ||
231 | tmpfs_dentry_t *dtmp = root->child; |
231 | tmpfs_dentry_t *dtmp = root->child; |
232 | tmpfs_dentry_t *dcur = root; |
232 | tmpfs_dentry_t *dcur = root; |
233 | 233 | ||
234 | if (PLB_GET_CHAR(next) == '/') |
234 | if (PLB_GET_CHAR(next) == '/') |
235 | next++; /* eat slash */ |
235 | next++; /* eat slash */ |
236 | 236 | ||
237 | char component[NAME_MAX + 1]; |
237 | char component[NAME_MAX + 1]; |
238 | int len = 0; |
238 | int len = 0; |
239 | while (dtmp && next <= last) { |
239 | while (dtmp && next <= last) { |
240 | 240 | ||
241 | /* collect the component */ |
241 | /* collect the component */ |
242 | if (PLB_GET_CHAR(next) != '/') { |
242 | if (PLB_GET_CHAR(next) != '/') { |
243 | if (len + 1 == NAME_MAX) { |
243 | if (len + 1 == NAME_MAX) { |
244 | /* comopnent length overflow */ |
244 | /* comopnent length overflow */ |
245 | ipc_answer_0(rid, ENAMETOOLONG); |
245 | ipc_answer_0(rid, ENAMETOOLONG); |
246 | return; |
246 | return; |
247 | } |
247 | } |
248 | component[len++] = PLB_GET_CHAR(next); |
248 | component[len++] = PLB_GET_CHAR(next); |
249 | next++; /* process next character */ |
249 | next++; /* process next character */ |
250 | if (next <= last) |
250 | if (next <= last) |
251 | continue; |
251 | continue; |
252 | } |
252 | } |
253 | 253 | ||
254 | assert(len); |
254 | assert(len); |
255 | component[len] = '\0'; |
255 | component[len] = '\0'; |
256 | next++; /* eat slash */ |
256 | next++; /* eat slash */ |
257 | len = 0; |
257 | len = 0; |
258 | 258 | ||
259 | /* match the component */ |
259 | /* match the component */ |
260 | while (dtmp && !match_component(dtmp, component)) |
260 | while (dtmp && !match_component(dtmp, component)) |
261 | dtmp = dtmp->sibling; |
261 | dtmp = dtmp->sibling; |
262 | 262 | ||
263 | /* handle miss: match amongst siblings */ |
263 | /* handle miss: match amongst siblings */ |
264 | if (!dtmp) { |
264 | if (!dtmp) { |
265 | if ((next > last) && (lflag & L_CREATE)) { |
265 | if ((next > last) && (lflag & L_CREATE)) { |
266 | /* no components left and L_CREATE specified */ |
266 | /* no components left and L_CREATE specified */ |
267 | if (dcur->type != TMPFS_DIRECTORY) { |
267 | if (dcur->type != TMPFS_DIRECTORY) { |
268 | ipc_answer_0(rid, ENOTDIR); |
268 | ipc_answer_0(rid, ENOTDIR); |
269 | return; |
269 | return; |
270 | } |
270 | } |
271 | void *nodep = create_node(dcur, |
271 | void *nodep = create_node(dcur, |
272 | component, lflag); |
272 | component, lflag); |
273 | if (nodep) { |
273 | if (nodep) { |
274 | ipc_answer_5(rid, EOK, |
274 | ipc_answer_5(rid, EOK, |
275 | tmpfs_reg.fs_handle, dev_handle, |
275 | tmpfs_reg.fs_handle, dev_handle, |
276 | TMPFS_GET_INDEX(nodep), 0, |
276 | TMPFS_GET_INDEX(nodep), 0, |
277 | TMPFS_GET_LNKCNT(nodep)); |
277 | TMPFS_GET_LNKCNT(nodep)); |
278 | } else { |
278 | } else { |
279 | ipc_answer_0(rid, ENOSPC); |
279 | ipc_answer_0(rid, ENOSPC); |
280 | } |
280 | } |
281 | return; |
281 | return; |
282 | } |
282 | } |
283 | ipc_answer_0(rid, ENOENT); |
283 | ipc_answer_0(rid, ENOENT); |
284 | return; |
284 | return; |
285 | } |
285 | } |
286 | 286 | ||
287 | /* descend one level */ |
287 | /* descend one level */ |
288 | dcur = dtmp; |
288 | dcur = dtmp; |
289 | dtmp = dtmp->child; |
289 | dtmp = dtmp->child; |
290 | } |
290 | } |
291 | 291 | ||
292 | /* handle miss: excessive components */ |
292 | /* handle miss: excessive components */ |
293 | if (!dtmp && next <= last) { |
293 | if (!dtmp && next <= last) { |
294 | if (lflag & L_CREATE) { |
294 | if (lflag & L_CREATE) { |
295 | if (dcur->type != TMPFS_DIRECTORY) { |
295 | if (dcur->type != TMPFS_DIRECTORY) { |
296 | ipc_answer_0(rid, ENOTDIR); |
296 | ipc_answer_0(rid, ENOTDIR); |
297 | return; |
297 | return; |
298 | } |
298 | } |
299 | 299 | ||
300 | /* collect next component */ |
300 | /* collect next component */ |
301 | while (next <= last) { |
301 | while (next <= last) { |
302 | if (PLB_GET_CHAR(next) == '/') { |
302 | if (PLB_GET_CHAR(next) == '/') { |
303 | /* more than one component */ |
303 | /* more than one component */ |
304 | ipc_answer_0(rid, ENOENT); |
304 | ipc_answer_0(rid, ENOENT); |
305 | return; |
305 | return; |
306 | } |
306 | } |
307 | if (len + 1 == NAME_MAX) { |
307 | if (len + 1 == NAME_MAX) { |
308 | /* component length overflow */ |
308 | /* component length overflow */ |
309 | ipc_answer_0(rid, ENAMETOOLONG); |
309 | ipc_answer_0(rid, ENAMETOOLONG); |
310 | return; |
310 | return; |
311 | } |
311 | } |
312 | component[len++] = PLB_GET_CHAR(next); |
312 | component[len++] = PLB_GET_CHAR(next); |
313 | next++; /* process next character */ |
313 | next++; /* process next character */ |
314 | } |
314 | } |
315 | assert(len); |
315 | assert(len); |
316 | component[len] = '\0'; |
316 | component[len] = '\0'; |
317 | len = 0; |
317 | len = 0; |
318 | 318 | ||
319 | void *nodep = create_node(dcur, component, lflag); |
319 | void *nodep = create_node(dcur, component, lflag); |
320 | if (nodep) { |
320 | if (nodep) { |
321 | ipc_answer_5(rid, EOK, tmpfs_reg.fs_handle, |
321 | ipc_answer_5(rid, EOK, tmpfs_reg.fs_handle, |
322 | dev_handle, TMPFS_GET_INDEX(nodep), 0, |
322 | dev_handle, TMPFS_GET_INDEX(nodep), 0, |
323 | TMPFS_GET_LNKCNT(nodep)); |
323 | TMPFS_GET_LNKCNT(nodep)); |
324 | } else { |
324 | } else { |
325 | ipc_answer_0(rid, ENOSPC); |
325 | ipc_answer_0(rid, ENOSPC); |
326 | } |
326 | } |
327 | return; |
327 | return; |
328 | } |
328 | } |
329 | ipc_answer_0(rid, ENOENT); |
329 | ipc_answer_0(rid, ENOENT); |
330 | return; |
330 | return; |
331 | } |
331 | } |
332 | 332 | ||
333 | /* handle hit */ |
333 | /* handle hit */ |
334 | if (lflag & L_DESTROY) { |
334 | if (lflag & L_DESTROY) { |
335 | unsigned old_lnkcnt = TMPFS_GET_LNKCNT(dcur); |
335 | unsigned old_lnkcnt = TMPFS_GET_LNKCNT(dcur); |
336 | int res = destroy_component(dcur); |
336 | int res = destroy_component(dcur); |
337 | ipc_answer_5(rid, (ipcarg_t)res, tmpfs_reg.fs_handle, |
337 | ipc_answer_5(rid, (ipcarg_t)res, tmpfs_reg.fs_handle, |
338 | dev_handle, dcur->index, dcur->size, old_lnkcnt); |
338 | dev_handle, dcur->index, dcur->size, old_lnkcnt); |
339 | return; |
339 | return; |
340 | } |
340 | } |
341 | if ((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) { |
341 | if ((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) { |
342 | ipc_answer_0(rid, EEXIST); |
342 | ipc_answer_0(rid, EEXIST); |
343 | return; |
343 | return; |
344 | } |
344 | } |
345 | if ((lflag & L_FILE) && (dcur->type != TMPFS_FILE)) { |
345 | if ((lflag & L_FILE) && (dcur->type != TMPFS_FILE)) { |
346 | ipc_answer_0(rid, EISDIR); |
346 | ipc_answer_0(rid, EISDIR); |
347 | return; |
347 | return; |
348 | } |
348 | } |
349 | if ((lflag & L_DIRECTORY) && (dcur->type != TMPFS_DIRECTORY)) { |
349 | if ((lflag & L_DIRECTORY) && (dcur->type != TMPFS_DIRECTORY)) { |
350 | ipc_answer_0(rid, ENOTDIR); |
350 | ipc_answer_0(rid, ENOTDIR); |
351 | return; |
351 | return; |
352 | } |
352 | } |
353 | 353 | ||
354 | ipc_answer_5(rid, EOK, tmpfs_reg.fs_handle, dev_handle, dcur->index, |
354 | ipc_answer_5(rid, EOK, tmpfs_reg.fs_handle, dev_handle, dcur->index, |
355 | dcur->size, TMPFS_GET_LNKCNT(dcur)); |
355 | dcur->size, TMPFS_GET_LNKCNT(dcur)); |
356 | } |
356 | } |
357 | 357 | ||
358 | void tmpfs_read(ipc_callid_t rid, ipc_call_t *request) |
358 | void tmpfs_read(ipc_callid_t rid, ipc_call_t *request) |
359 | { |
359 | { |
360 | int dev_handle = IPC_GET_ARG1(*request); |
360 | int dev_handle = IPC_GET_ARG1(*request); |
361 | unsigned long index = IPC_GET_ARG2(*request); |
361 | unsigned long index = IPC_GET_ARG2(*request); |
362 | off_t pos = IPC_GET_ARG3(*request); |
362 | off_t pos = IPC_GET_ARG3(*request); |
363 | 363 | ||
364 | /* |
364 | /* |
365 | * Lookup the respective dentry. |
365 | * Lookup the respective dentry. |
366 | */ |
366 | */ |
367 | link_t *hlp; |
367 | link_t *hlp; |
368 | hlp = hash_table_find(&dentries, &index); |
368 | hlp = hash_table_find(&dentries, &index); |
369 | if (!hlp) { |
369 | if (!hlp) { |
370 | ipc_answer_0(rid, ENOENT); |
370 | ipc_answer_0(rid, ENOENT); |
371 | return; |
371 | return; |
372 | } |
372 | } |
373 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
373 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
374 | dh_link); |
374 | dh_link); |
375 | 375 | ||
376 | /* |
376 | /* |
377 | * Receive the read request. |
377 | * Receive the read request. |
378 | */ |
378 | */ |
379 | ipc_callid_t callid; |
379 | ipc_callid_t callid; |
380 | size_t len; |
380 | size_t len; |
381 | if (!ipc_data_read_receive(&callid, &len)) { |
381 | if (!ipc_data_read_receive(&callid, &len)) { |
382 | ipc_answer_0(callid, EINVAL); |
382 | ipc_answer_0(callid, EINVAL); |
383 | ipc_answer_0(rid, EINVAL); |
383 | ipc_answer_0(rid, EINVAL); |
384 | return; |
384 | return; |
385 | } |
385 | } |
386 | 386 | ||
387 | size_t bytes; |
387 | size_t bytes; |
388 | if (dentry->type == TMPFS_FILE) { |
388 | if (dentry->type == TMPFS_FILE) { |
389 | bytes = max(0, min(dentry->size - pos, len)); |
389 | bytes = max(0, min(dentry->size - pos, len)); |
390 | (void) ipc_data_read_finalize(callid, dentry->data + pos, |
390 | (void) ipc_data_read_finalize(callid, dentry->data + pos, |
391 | bytes); |
391 | bytes); |
392 | } else { |
392 | } else { |
393 | int i; |
393 | int i; |
394 | tmpfs_dentry_t *cur = dentry->child; |
394 | tmpfs_dentry_t *cur; |
395 | 395 | ||
396 | assert(dentry->type == TMPFS_DIRECTORY); |
396 | assert(dentry->type == TMPFS_DIRECTORY); |
397 | 397 | ||
398 | /* |
398 | /* |
399 | * Yes, we really use O(n) algorithm here. |
399 | * Yes, we really use O(n) algorithm here. |
400 | * If it bothers someone, it could be fixed by introducing a |
400 | * If it bothers someone, it could be fixed by introducing a |
401 | * hash table. |
401 | * hash table. |
402 | */ |
402 | */ |
403 | for (i = 0, cur = dentry->child; i < pos && cur; i++, |
403 | for (i = 0, cur = dentry->child; i < pos && cur; i++, |
404 | cur = cur->sibling) |
404 | cur = cur->sibling) |
405 | ; |
405 | ; |
406 | 406 | ||
407 | if (!cur) { |
407 | if (!cur) { |
408 | ipc_answer_0(callid, ENOENT); |
408 | ipc_answer_0(callid, ENOENT); |
409 | ipc_answer_1(rid, ENOENT, 0); |
409 | ipc_answer_1(rid, ENOENT, 0); |
410 | return; |
410 | return; |
411 | } |
411 | } |
412 | 412 | ||
413 | (void) ipc_data_read_finalize(callid, cur->name, |
413 | (void) ipc_data_read_finalize(callid, cur->name, |
414 | strlen(cur->name) + 1); |
414 | strlen(cur->name) + 1); |
415 | bytes = 1; |
415 | bytes = 1; |
416 | } |
416 | } |
417 | 417 | ||
418 | /* |
418 | /* |
419 | * Answer the VFS_READ call. |
419 | * Answer the VFS_READ call. |
420 | */ |
420 | */ |
421 | ipc_answer_1(rid, EOK, bytes); |
421 | ipc_answer_1(rid, EOK, bytes); |
422 | } |
422 | } |
423 | 423 | ||
424 | void tmpfs_write(ipc_callid_t rid, ipc_call_t *request) |
424 | void tmpfs_write(ipc_callid_t rid, ipc_call_t *request) |
425 | { |
425 | { |
426 | int dev_handle = IPC_GET_ARG1(*request); |
426 | int dev_handle = IPC_GET_ARG1(*request); |
427 | unsigned long index = IPC_GET_ARG2(*request); |
427 | unsigned long index = IPC_GET_ARG2(*request); |
428 | off_t pos = IPC_GET_ARG3(*request); |
428 | off_t pos = IPC_GET_ARG3(*request); |
429 | 429 | ||
430 | /* |
430 | /* |
431 | * Lookup the respective dentry. |
431 | * Lookup the respective dentry. |
432 | */ |
432 | */ |
433 | link_t *hlp; |
433 | link_t *hlp; |
434 | hlp = hash_table_find(&dentries, &index); |
434 | hlp = hash_table_find(&dentries, &index); |
435 | if (!hlp) { |
435 | if (!hlp) { |
436 | ipc_answer_0(rid, ENOENT); |
436 | ipc_answer_0(rid, ENOENT); |
437 | return; |
437 | return; |
438 | } |
438 | } |
439 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
439 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
440 | dh_link); |
440 | dh_link); |
441 | 441 | ||
442 | /* |
442 | /* |
443 | * Receive the write request. |
443 | * Receive the write request. |
444 | */ |
444 | */ |
445 | ipc_callid_t callid; |
445 | ipc_callid_t callid; |
446 | size_t len; |
446 | size_t len; |
447 | if (!ipc_data_write_receive(&callid, &len)) { |
447 | if (!ipc_data_write_receive(&callid, &len)) { |
448 | ipc_answer_0(callid, EINVAL); |
448 | ipc_answer_0(callid, EINVAL); |
449 | ipc_answer_0(rid, EINVAL); |
449 | ipc_answer_0(rid, EINVAL); |
450 | return; |
450 | return; |
451 | } |
451 | } |
452 | 452 | ||
453 | /* |
453 | /* |
454 | * Check whether the file needs to grow. |
454 | * Check whether the file needs to grow. |
455 | */ |
455 | */ |
456 | if (pos + len <= dentry->size) { |
456 | if (pos + len <= dentry->size) { |
457 | /* The file size is not changing. */ |
457 | /* The file size is not changing. */ |
458 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
458 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
459 | ipc_answer_2(rid, EOK, len, dentry->size); |
459 | ipc_answer_2(rid, EOK, len, dentry->size); |
460 | return; |
460 | return; |
461 | } |
461 | } |
462 | size_t delta = (pos + len) - dentry->size; |
462 | size_t delta = (pos + len) - dentry->size; |
463 | /* |
463 | /* |
464 | * At this point, we are deliberately extremely straightforward and |
464 | * At this point, we are deliberately extremely straightforward and |
465 | * simply realloc the contents of the file on every write that grows the |
465 | * simply realloc the contents of the file on every write that grows the |
466 | * file. In the end, the situation might not be as bad as it may look: |
466 | * file. In the end, the situation might not be as bad as it may look: |
467 | * our heap allocator can save us and just grow the block whenever |
467 | * our heap allocator can save us and just grow the block whenever |
468 | * possible. |
468 | * possible. |
469 | */ |
469 | */ |
470 | void *newdata = realloc(dentry->data, dentry->size + delta); |
470 | void *newdata = realloc(dentry->data, dentry->size + delta); |
471 | if (!newdata) { |
471 | if (!newdata) { |
472 | ipc_answer_0(callid, ENOMEM); |
472 | ipc_answer_0(callid, ENOMEM); |
473 | ipc_answer_2(rid, EOK, 0, dentry->size); |
473 | ipc_answer_2(rid, EOK, 0, dentry->size); |
474 | return; |
474 | return; |
475 | } |
475 | } |
476 | /* Clear any newly allocated memory in order to emulate gaps. */ |
476 | /* Clear any newly allocated memory in order to emulate gaps. */ |
477 | memset(newdata + dentry->size, 0, delta); |
477 | memset(newdata + dentry->size, 0, delta); |
478 | dentry->size += delta; |
478 | dentry->size += delta; |
479 | dentry->data = newdata; |
479 | dentry->data = newdata; |
480 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
480 | (void) ipc_data_write_finalize(callid, dentry->data + pos, len); |
481 | ipc_answer_2(rid, EOK, len, dentry->size); |
481 | ipc_answer_2(rid, EOK, len, dentry->size); |
482 | } |
482 | } |
483 | 483 | ||
484 | void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
484 | void tmpfs_truncate(ipc_callid_t rid, ipc_call_t *request) |
485 | { |
485 | { |
486 | int dev_handle = IPC_GET_ARG1(*request); |
486 | int dev_handle = IPC_GET_ARG1(*request); |
487 | unsigned long index = IPC_GET_ARG2(*request); |
487 | unsigned long index = IPC_GET_ARG2(*request); |
488 | size_t size = IPC_GET_ARG3(*request); |
488 | size_t size = IPC_GET_ARG3(*request); |
489 | 489 | ||
490 | /* |
490 | /* |
491 | * Lookup the respective dentry. |
491 | * Lookup the respective dentry. |
492 | */ |
492 | */ |
493 | link_t *hlp; |
493 | link_t *hlp; |
494 | hlp = hash_table_find(&dentries, &index); |
494 | hlp = hash_table_find(&dentries, &index); |
495 | if (!hlp) { |
495 | if (!hlp) { |
496 | ipc_answer_0(rid, ENOENT); |
496 | ipc_answer_0(rid, ENOENT); |
497 | return; |
497 | return; |
498 | } |
498 | } |
499 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
499 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
500 | dh_link); |
500 | dh_link); |
501 | 501 | ||
502 | if (size == dentry->size) { |
502 | if (size == dentry->size) { |
503 | ipc_answer_0(rid, EOK); |
503 | ipc_answer_0(rid, EOK); |
504 | return; |
504 | return; |
505 | } |
505 | } |
506 | 506 | ||
507 | void *newdata = realloc(dentry->data, size); |
507 | void *newdata = realloc(dentry->data, size); |
508 | if (!newdata) { |
508 | if (!newdata) { |
509 | ipc_answer_0(rid, ENOMEM); |
509 | ipc_answer_0(rid, ENOMEM); |
510 | return; |
510 | return; |
511 | } |
511 | } |
512 | if (size > dentry->size) { |
512 | if (size > dentry->size) { |
513 | size_t delta = size - dentry->size; |
513 | size_t delta = size - dentry->size; |
514 | memset(newdata + dentry->size, 0, delta); |
514 | memset(newdata + dentry->size, 0, delta); |
515 | } |
515 | } |
516 | dentry->size = size; |
516 | dentry->size = size; |
517 | dentry->data = newdata; |
517 | dentry->data = newdata; |
518 | ipc_answer_0(rid, EOK); |
518 | ipc_answer_0(rid, EOK); |
519 | } |
519 | } |
520 | 520 | ||
521 | void tmpfs_free(ipc_callid_t rid, ipc_call_t *request) |
521 | void tmpfs_free(ipc_callid_t rid, ipc_call_t *request) |
522 | { |
522 | { |
523 | int dev_handle = IPC_GET_ARG1(*request); |
523 | int dev_handle = IPC_GET_ARG1(*request); |
524 | unsigned long index = IPC_GET_ARG2(*request); |
524 | unsigned long index = IPC_GET_ARG2(*request); |
525 | 525 | ||
526 | link_t *hlp; |
526 | link_t *hlp; |
527 | hlp = hash_table_find(&dentries, &index); |
527 | hlp = hash_table_find(&dentries, &index); |
528 | if (!hlp) { |
528 | if (!hlp) { |
529 | ipc_answer_0(rid, ENOENT); |
529 | ipc_answer_0(rid, ENOENT); |
530 | return; |
530 | return; |
531 | } |
531 | } |
532 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
532 | tmpfs_dentry_t *dentry = hash_table_get_instance(hlp, tmpfs_dentry_t, |
533 | dh_link); |
533 | dh_link); |
534 | 534 | ||
535 | assert(!dentry->parent); |
535 | assert(!dentry->parent); |
536 | assert(!dentry->child); |
536 | assert(!dentry->child); |
537 | assert(!dentry->sibling); |
537 | assert(!dentry->sibling); |
538 | 538 | ||
539 | hash_table_remove(&dentries, &index, 1); |
539 | hash_table_remove(&dentries, &index, 1); |
540 | 540 | ||
541 | if (dentry->type == TMPFS_FILE) |
541 | if (dentry->type == TMPFS_FILE) |
542 | free(dentry->data); |
542 | free(dentry->data); |
543 | free(dentry->name); |
543 | free(dentry->name); |
544 | free(dentry); |
544 | free(dentry); |
545 | 545 | ||
546 | ipc_answer_0(rid, EOK); |
546 | ipc_answer_0(rid, EOK); |
547 | } |
547 | } |
548 | 548 | ||
549 | /** |
549 | /** |
550 | * @} |
550 | * @} |
551 | */ |
551 | */ |
552 | 552 |