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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 fat_ops.c |
34 | * @file fat_ops.c |
35 | * @brief Implementation of VFS operations for the FAT file system server. |
35 | * @brief Implementation of VFS operations for the FAT file system server. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include "fat.h" |
38 | #include "fat.h" |
39 | #include "../../vfs/vfs.h" |
39 | #include "../../vfs/vfs.h" |
40 | #include <libfs.h> |
40 | #include <libfs.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 <string.h> |
44 | #include <string.h> |
45 | #include <byteorder.h> |
45 | #include <byteorder.h> |
46 | #include <libadt/hash_table.h> |
46 | #include <libadt/hash_table.h> |
47 | #include <libadt/list.h> |
47 | #include <libadt/list.h> |
48 | #include <assert.h> |
48 | #include <assert.h> |
49 | 49 | ||
50 | #define BS_BLOCK 0 |
50 | #define BS_BLOCK 0 |
51 | 51 | ||
52 | #define FIN_KEY_DEV_HANDLE 0 |
52 | #define FIN_KEY_DEV_HANDLE 0 |
53 | #define FIN_KEY_INDEX 1 |
53 | #define FIN_KEY_INDEX 1 |
54 | 54 | ||
55 | /** Hash table of FAT in-core nodes. */ |
55 | /** Hash table of FAT in-core nodes. */ |
56 | hash_table_t fin_hash; |
56 | hash_table_t fin_hash; |
57 | 57 | ||
58 | /** List of free FAT in-core nodes. */ |
58 | /** List of free FAT in-core nodes. */ |
59 | link_t ffn_head; |
59 | link_t ffn_head; |
60 | 60 | ||
61 | #define FAT_NAME_LEN 8 |
61 | #define FAT_NAME_LEN 8 |
62 | #define FAT_EXT_LEN 3 |
62 | #define FAT_EXT_LEN 3 |
63 | 63 | ||
64 | #define FAT_PAD ' ' |
64 | #define FAT_PAD ' ' |
65 | 65 | ||
66 | #define FAT_DENTRY_UNUSED 0x00 |
66 | #define FAT_DENTRY_UNUSED 0x00 |
67 | #define FAT_DENTRY_E5_ESC 0x05 |
67 | #define FAT_DENTRY_E5_ESC 0x05 |
68 | #define FAT_DENTRY_DOT 0x2e |
68 | #define FAT_DENTRY_DOT 0x2e |
69 | #define FAT_DENTRY_ERASED 0xe5 |
69 | #define FAT_DENTRY_ERASED 0xe5 |
70 | 70 | ||
71 | static void dentry_name_canonify(fat_dentry_t *d, char *buf) |
71 | static void dentry_name_canonify(fat_dentry_t *d, char *buf) |
72 | { |
72 | { |
73 | int i; |
73 | int i; |
74 | 74 | ||
75 | for (i = 0; i < FAT_NAME_LEN; i++) { |
75 | for (i = 0; i < FAT_NAME_LEN; i++) { |
76 | if (d->name[i] == FAT_PAD) { |
76 | if (d->name[i] == FAT_PAD) { |
77 | buf++; |
77 | buf++; |
78 | break; |
78 | break; |
79 | } |
79 | } |
80 | if (d->name[i] == FAT_DENTRY_E5_ESC) |
80 | if (d->name[i] == FAT_DENTRY_E5_ESC) |
81 | *buf++ = 0xe5; |
81 | *buf++ = 0xe5; |
82 | else |
82 | else |
83 | *buf++ = d->name[i]; |
83 | *buf++ = d->name[i]; |
84 | } |
84 | } |
85 | if (d->ext[0] != FAT_PAD) |
85 | if (d->ext[0] != FAT_PAD) |
86 | *buf++ = '.'; |
86 | *buf++ = '.'; |
87 | for (i = 0; i < FAT_EXT_LEN; i++) { |
87 | for (i = 0; i < FAT_EXT_LEN; i++) { |
88 | if (d->ext[i] == FAT_PAD) { |
88 | if (d->ext[i] == FAT_PAD) { |
89 | *buf = '\0'; |
89 | *buf = '\0'; |
90 | return; |
90 | return; |
91 | } |
91 | } |
92 | if (d->ext[i] == FAT_DENTRY_E5_ESC) |
92 | if (d->ext[i] == FAT_DENTRY_E5_ESC) |
93 | *buf++ = 0xe5; |
93 | *buf++ = 0xe5; |
94 | else |
94 | else |
95 | *buf++ = d->ext[i]; |
95 | *buf++ = d->ext[i]; |
96 | } |
96 | } |
97 | } |
97 | } |
98 | 98 | ||
99 | /* TODO and also move somewhere else */ |
99 | /* TODO and also move somewhere else */ |
100 | typedef struct { |
100 | typedef struct { |
101 | void *data; |
101 | void *data; |
102 | } block_t; |
102 | } block_t; |
103 | 103 | ||
104 | static block_t *block_get(dev_handle_t dev_handle, off_t offset) |
104 | static block_t *block_get(dev_handle_t dev_handle, off_t offset) |
105 | { |
105 | { |
106 | return NULL; /* TODO */ |
106 | return NULL; /* TODO */ |
107 | } |
107 | } |
108 | 108 | ||
109 | static block_t *fat_block_get(dev_handle_t dev_handle, fs_index_t index, |
109 | static block_t *fat_block_get(dev_handle_t dev_handle, fs_index_t index, |
110 | off_t offset) { |
110 | off_t offset) { |
111 | return NULL; /* TODO */ |
111 | return NULL; /* TODO */ |
112 | } |
112 | } |
113 | 113 | ||
114 | static void block_put(block_t *block) |
114 | static void block_put(block_t *block) |
115 | { |
115 | { |
116 | /* TODO */ |
116 | /* TODO */ |
117 | } |
117 | } |
118 | 118 | ||
119 | static void fat_node_initialize(fat_node_t *node) |
119 | static void fat_node_initialize(fat_node_t *node) |
120 | { |
120 | { |
121 | node->type = 0; |
121 | node->type = 0; |
122 | node->index = 0; |
122 | node->index = 0; |
123 | node->pindex = 0; |
123 | node->pindex = 0; |
124 | node->dev_handle = 0; |
124 | node->dev_handle = 0; |
125 | link_initialize(&node->fin_link); |
125 | link_initialize(&node->fin_link); |
126 | link_initialize(&node->ffn_link); |
126 | link_initialize(&node->ffn_link); |
127 | node->size = 0; |
127 | node->size = 0; |
128 | node->lnkcnt = 0; |
128 | node->lnkcnt = 0; |
129 | node->refcnt = 0; |
129 | node->refcnt = 0; |
130 | node->dirty = false; |
130 | node->dirty = false; |
131 | } |
131 | } |
132 | 132 | ||
133 | static uint16_t fat_bps_get(dev_handle_t dev_handle) |
133 | static uint16_t fat_bps_get(dev_handle_t dev_handle) |
134 | { |
134 | { |
135 | block_t *bb; |
135 | block_t *bb; |
136 | uint16_t bps; |
136 | uint16_t bps; |
137 | 137 | ||
138 | bb = block_get(dev_handle, BS_BLOCK); |
138 | bb = block_get(dev_handle, BS_BLOCK); |
139 | assert(bb != NULL); |
139 | assert(bb != NULL); |
140 | bps = uint16_t_le2host(((fat_bs_t *)bb->data)->bps); |
140 | bps = uint16_t_le2host(((fat_bs_t *)bb->data)->bps); |
141 | block_put(bb); |
141 | block_put(bb); |
142 | 142 | ||
143 | return bps; |
143 | return bps; |
144 | } |
144 | } |
145 | 145 | ||
- | 146 | typedef enum { |
|
- | 147 | FAT_DENTRY_SKIP, |
|
- | 148 | FAT_DENTRY_LAST, |
|
- | 149 | FAT_DENTRY_VALID |
|
- | 150 | } fat_dentry_clsf_t; |
|
- | 151 | ||
- | 152 | static fat_dentry_clsf_t fat_classify_dentry(fat_dentry_t *d) |
|
- | 153 | { |
|
- | 154 | if (d->attr & FAT_ATTR_VOLLABEL) { |
|
- | 155 | /* volume label entry */ |
|
- | 156 | return FAT_DENTRY_SKIP; |
|
- | 157 | } |
|
- | 158 | if (d->name[0] == FAT_DENTRY_ERASED) { |
|
- | 159 | /* not-currently-used entry */ |
|
- | 160 | return FAT_DENTRY_SKIP; |
|
- | 161 | } |
|
- | 162 | if (d->name[0] == FAT_DENTRY_UNUSED) { |
|
- | 163 | /* never used entry */ |
|
- | 164 | return FAT_DENTRY_LAST; |
|
- | 165 | } |
|
- | 166 | if (d->name[0] == FAT_DENTRY_DOT) { |
|
- | 167 | /* |
|
- | 168 | * Most likely '.' or '..'. |
|
- | 169 | * It cannot occur in a regular file name. |
|
- | 170 | */ |
|
- | 171 | return FAT_DENTRY_SKIP; |
|
- | 172 | } |
|
- | 173 | return FAT_DENTRY_VALID; |
|
- | 174 | } |
|
- | 175 | ||
146 | static void fat_sync_node(fat_node_t *node) |
176 | static void fat_sync_node(fat_node_t *node) |
147 | { |
177 | { |
148 | /* TODO */ |
178 | /* TODO */ |
149 | } |
179 | } |
150 | 180 | ||
151 | /** Instantiate a FAT in-core node. |
181 | /** Instantiate a FAT in-core node. |
152 | * |
182 | * |
153 | * FAT stores the info necessary for instantiation of a node in the parent of |
183 | * FAT stores the info necessary for instantiation of a node in the parent of |
154 | * that node. This design necessitated the addition of the parent node index |
184 | * that node. This design necessitated the addition of the parent node index |
155 | * parameter to this otherwise generic libfs API. |
185 | * parameter to this otherwise generic libfs API. |
156 | */ |
186 | */ |
157 | static void * |
187 | static void * |
158 | fat_node_get(dev_handle_t dev_handle, fs_index_t index, fs_index_t pindex) |
188 | fat_node_get(dev_handle_t dev_handle, fs_index_t index, fs_index_t pindex) |
159 | { |
189 | { |
160 | link_t *lnk; |
190 | link_t *lnk; |
161 | fat_node_t *node = NULL; |
191 | fat_node_t *node = NULL; |
162 | block_t *b; |
192 | block_t *b; |
163 | unsigned bps; |
193 | unsigned bps; |
164 | unsigned dps; |
194 | unsigned dps; |
165 | fat_dentry_t *d; |
195 | fat_dentry_t *d; |
166 | unsigned i, j; |
196 | unsigned i, j; |
167 | 197 | ||
168 | unsigned long key[] = { |
198 | unsigned long key[] = { |
169 | [FIN_KEY_DEV_HANDLE] = dev_handle, |
199 | [FIN_KEY_DEV_HANDLE] = dev_handle, |
170 | [FIN_KEY_INDEX] = index |
200 | [FIN_KEY_INDEX] = index |
171 | }; |
201 | }; |
172 | 202 | ||
173 | lnk = hash_table_find(&fin_hash, key); |
203 | lnk = hash_table_find(&fin_hash, key); |
174 | if (lnk) { |
204 | if (lnk) { |
175 | /* |
205 | /* |
176 | * The in-core node was found in the hash table. |
206 | * The in-core node was found in the hash table. |
177 | */ |
207 | */ |
178 | node = hash_table_get_instance(lnk, fat_node_t, fin_link); |
208 | node = hash_table_get_instance(lnk, fat_node_t, fin_link); |
179 | if (!node->refcnt++) |
209 | if (!node->refcnt++) |
180 | list_remove(&node->ffn_link); |
210 | list_remove(&node->ffn_link); |
181 | return (void *) node; |
211 | return (void *) node; |
182 | } |
212 | } |
183 | 213 | ||
184 | bps = fat_bps_get(dev_handle); |
214 | bps = fat_bps_get(dev_handle); |
185 | dps = bps / sizeof(fat_dentry_t); |
215 | dps = bps / sizeof(fat_dentry_t); |
186 | 216 | ||
187 | if (!list_empty(&ffn_head)) { |
217 | if (!list_empty(&ffn_head)) { |
188 | /* |
218 | /* |
189 | * We are going to reuse a node from the free list. |
219 | * We are going to reuse a node from the free list. |
190 | */ |
220 | */ |
191 | lnk = ffn_head.next; |
221 | lnk = ffn_head.next; |
192 | list_remove(lnk); |
222 | list_remove(lnk); |
193 | node = list_get_instance(lnk, fat_node_t, ffn_link); |
223 | node = list_get_instance(lnk, fat_node_t, ffn_link); |
194 | assert(!node->refcnt); |
224 | assert(!node->refcnt); |
195 | if (node->dirty) |
225 | if (node->dirty) |
196 | fat_sync_node(node); |
226 | fat_sync_node(node); |
197 | key[FIN_KEY_DEV_HANDLE] = node->dev_handle; |
227 | key[FIN_KEY_DEV_HANDLE] = node->dev_handle; |
198 | key[FIN_KEY_INDEX] = node->index; |
228 | key[FIN_KEY_INDEX] = node->index; |
199 | hash_table_remove(&fin_hash, key, sizeof(key)/sizeof(*key)); |
229 | hash_table_remove(&fin_hash, key, sizeof(key)/sizeof(*key)); |
200 | } else { |
230 | } else { |
201 | /* |
231 | /* |
202 | * We need to allocate a new node. |
232 | * We need to allocate a new node. |
203 | */ |
233 | */ |
204 | node = malloc(sizeof(fat_node_t)); |
234 | node = malloc(sizeof(fat_node_t)); |
205 | if (!node) |
235 | if (!node) |
206 | return NULL; |
236 | return NULL; |
207 | } |
237 | } |
208 | fat_node_initialize(node); |
238 | fat_node_initialize(node); |
209 | node->refcnt++; |
239 | node->refcnt++; |
210 | node->lnkcnt++; |
240 | node->lnkcnt++; |
211 | node->dev_handle = dev_handle; |
241 | node->dev_handle = dev_handle; |
212 | node->index = index; |
242 | node->index = index; |
213 | node->pindex = pindex; |
243 | node->pindex = pindex; |
214 | 244 | ||
215 | /* |
245 | /* |
216 | * Because of the design of the FAT file system, we have no clue about |
246 | * Because of the design of the FAT file system, we have no clue about |
217 | * how big (i.e. how many directory entries it contains) is the parent |
247 | * how big (i.e. how many directory entries it contains) is the parent |
218 | * of the node we are trying to instantiate. However, we know that it |
248 | * of the node we are trying to instantiate. However, we know that it |
219 | * must contain a directory entry for our node of interest. We simply |
249 | * must contain a directory entry for our node of interest. We simply |
220 | * scan the parent until we find it. |
250 | * scan the parent until we find it. |
221 | */ |
251 | */ |
222 | for (i = 0; ; i++) { |
252 | for (i = 0; ; i++) { |
223 | b = fat_block_get(node->dev_handle, node->pindex, i); |
253 | b = fat_block_get(node->dev_handle, node->pindex, i); |
224 | if (!b) { |
- | |
225 | node->refcnt--; |
- | |
226 | list_append(&node->ffn_link, &ffn_head); |
- | |
227 | return NULL; |
- | |
228 | } |
- | |
229 | for (j = 0; j < dps; j++) { |
254 | for (j = 0; j < dps; j++) { |
230 | d = ((fat_dentry_t *)b->data) + j; |
255 | d = ((fat_dentry_t *)b->data) + j; |
231 | if (d->firstc == node->index) |
256 | if (d->firstc == node->index) |
232 | goto found; |
257 | goto found; |
233 | } |
258 | } |
234 | block_put(b); |
259 | block_put(b); |
235 | } |
260 | } |
236 | 261 | ||
237 | found: |
262 | found: |
238 | if (!(d->attr & (FAT_ATTR_SUBDIR | FAT_ATTR_VOLLABEL))) |
263 | if (!(d->attr & (FAT_ATTR_SUBDIR | FAT_ATTR_VOLLABEL))) |
239 | node->type = FAT_FILE; |
264 | node->type = FAT_FILE; |
240 | if ((d->attr & FAT_ATTR_SUBDIR) || !index) |
265 | if ((d->attr & FAT_ATTR_SUBDIR) || !index) |
241 | node->type = FAT_DIRECTORY; |
266 | node->type = FAT_DIRECTORY; |
242 | assert((node->type == FAT_FILE) || (node->type == FAT_DIRECTORY)); |
267 | assert((node->type == FAT_FILE) || (node->type == FAT_DIRECTORY)); |
243 | 268 | ||
244 | node->size = uint32_t_le2host(d->size); |
269 | node->size = uint32_t_le2host(d->size); |
245 | block_put(b); |
270 | block_put(b); |
246 | 271 | ||
247 | key[FIN_KEY_DEV_HANDLE] = node->dev_handle; |
272 | key[FIN_KEY_DEV_HANDLE] = node->dev_handle; |
248 | key[FIN_KEY_INDEX] = node->index; |
273 | key[FIN_KEY_INDEX] = node->index; |
249 | hash_table_insert(&fin_hash, key, &node->fin_link); |
274 | hash_table_insert(&fin_hash, key, &node->fin_link); |
250 | 275 | ||
251 | return node; |
276 | return node; |
252 | } |
277 | } |
253 | 278 | ||
254 | static void *fat_match(void *prnt, const char *component) |
279 | static void *fat_match(void *prnt, const char *component) |
255 | { |
280 | { |
256 | fat_node_t *parentp = (fat_node_t *)prnt; |
281 | fat_node_t *parentp = (fat_node_t *)prnt; |
257 | char name[FAT_NAME_LEN + 1 + FAT_EXT_LEN + 1]; |
282 | char name[FAT_NAME_LEN + 1 + FAT_EXT_LEN + 1]; |
258 | unsigned i, j; |
283 | unsigned i, j; |
259 | unsigned bps; /* bytes per sector */ |
284 | unsigned bps; /* bytes per sector */ |
260 | unsigned dps; /* dentries per sector */ |
285 | unsigned dps; /* dentries per sector */ |
261 | unsigned blocks; |
286 | unsigned blocks; |
262 | fat_dentry_t *d; |
287 | fat_dentry_t *d; |
263 | block_t *b; |
288 | block_t *b; |
264 | 289 | ||
265 | bps = fat_bps_get(parentp->dev_handle); |
290 | bps = fat_bps_get(parentp->dev_handle); |
266 | dps = bps / sizeof(fat_dentry_t); |
291 | dps = bps / sizeof(fat_dentry_t); |
267 | blocks = parentp->size / bps + (parentp->size % bps != 0); |
292 | blocks = parentp->size / bps + (parentp->size % bps != 0); |
268 | for (i = 0; i < blocks; i++) { |
293 | for (i = 0; i < blocks; i++) { |
269 | unsigned dentries; |
294 | unsigned dentries; |
270 | 295 | ||
271 | b = fat_block_get(parentp->dev_handle, parentp->index, i); |
296 | b = fat_block_get(parentp->dev_handle, parentp->index, i); |
272 | if (!b) |
- | |
273 | return NULL; |
- | |
274 | - | ||
275 | dentries = (i == blocks - 1) ? |
297 | dentries = (i == blocks - 1) ? |
276 | parentp->size % sizeof(fat_dentry_t) : |
298 | parentp->size % sizeof(fat_dentry_t) : |
277 | dps; |
299 | dps; |
278 | for (j = 0; j < dentries; j++) { |
300 | for (j = 0; j < dentries; j++) { |
279 | d = ((fat_dentry_t *)b->data) + j; |
301 | d = ((fat_dentry_t *)b->data) + j; |
280 | if (d->attr & FAT_ATTR_VOLLABEL) { |
- | |
281 | /* volume label entry */ |
302 | switch (fat_classify_dentry(d)) { |
282 | continue; |
- | |
283 | } |
- | |
284 | if (d->name[0] == FAT_DENTRY_ERASED) { |
303 | case FAT_DENTRY_SKIP: |
285 | /* not-currently-used entry */ |
- | |
286 | continue; |
304 | continue; |
287 | } |
- | |
288 | if (d->name[0] == FAT_DENTRY_UNUSED) { |
305 | case FAT_DENTRY_LAST: |
289 | /* never used entry */ |
- | |
290 | block_put(b); |
306 | block_put(b); |
291 | return NULL; |
307 | return NULL; |
292 | } |
308 | default: |
293 | if (d->name[0] == FAT_DENTRY_DOT) { |
309 | case FAT_DENTRY_VALID: |
294 | /* |
- | |
295 | * Most likely '.' or '..'. |
- | |
296 | * It cannot occur in a regular file name. |
- | |
297 | */ |
- | |
298 | continue; |
- | |
299 | } |
- | |
300 | - | ||
301 | dentry_name_canonify(d, name); |
310 | dentry_name_canonify(d, name); |
- | 311 | break; |
|
- | 312 | } |
|
302 | if (strcmp(name, component) == 0) { |
313 | if (strcmp(name, component) == 0) { |
303 | /* hit */ |
314 | /* hit */ |
304 | void *node = fat_node_get(parentp->dev_handle, |
315 | void *node = fat_node_get(parentp->dev_handle, |
305 | (fs_index_t)uint16_t_le2host(d->firstc), |
316 | (fs_index_t)uint16_t_le2host(d->firstc), |
306 | parentp->index); |
317 | parentp->index); |
307 | block_put(b); |
318 | block_put(b); |
308 | return node; |
319 | return node; |
309 | } |
320 | } |
310 | } |
321 | } |
311 | block_put(b); |
322 | block_put(b); |
312 | } |
323 | } |
313 | 324 | ||
314 | return NULL; |
325 | return NULL; |
315 | } |
326 | } |
316 | 327 | ||
317 | static fs_index_t fat_index_get(void *node) |
328 | static fs_index_t fat_index_get(void *node) |
318 | { |
329 | { |
319 | fat_node_t *fnodep = (fat_node_t *)node; |
330 | fat_node_t *fnodep = (fat_node_t *)node; |
320 | if (!fnodep) |
331 | if (!fnodep) |
321 | return 0; |
332 | return 0; |
322 | return fnodep->index; |
333 | return fnodep->index; |
323 | } |
334 | } |
324 | 335 | ||
325 | static size_t fat_size_get(void *node) |
336 | static size_t fat_size_get(void *node) |
326 | { |
337 | { |
327 | return ((fat_node_t *)node)->size; |
338 | return ((fat_node_t *)node)->size; |
328 | } |
339 | } |
329 | 340 | ||
330 | static unsigned fat_lnkcnt_get(void *node) |
341 | static unsigned fat_lnkcnt_get(void *node) |
331 | { |
342 | { |
332 | return ((fat_node_t *)node)->lnkcnt; |
343 | return ((fat_node_t *)node)->lnkcnt; |
333 | } |
344 | } |
334 | 345 | ||
- | 346 | static bool fat_has_children(void *node) |
|
- | 347 | { |
|
- | 348 | fat_node_t *nodep = (fat_node_t *)node; |
|
- | 349 | unsigned bps; |
|
- | 350 | unsigned dps; |
|
- | 351 | unsigned blocks; |
|
- | 352 | block_t *b; |
|
- | 353 | unsigned i, j; |
|
- | 354 | ||
- | 355 | if (nodep->type != FAT_DIRECTORY) |
|
- | 356 | return false; |
|
- | 357 | ||
- | 358 | bps = fat_bps_get(nodep->dev_handle); |
|
- | 359 | dps = bps / sizeof(fat_dentry_t); |
|
- | 360 | ||
- | 361 | blocks = nodep->size / bps + (nodep->size % bps != 0); |
|
- | 362 | ||
- | 363 | for (i = 0; i < blocks; i++) { |
|
- | 364 | unsigned dentries; |
|
- | 365 | fat_dentry_t *d; |
|
- | 366 | ||
- | 367 | b = fat_block_get(nodep->dev_handle, nodep->index, i); |
|
- | 368 | dentries = (i == blocks - 1) ? |
|
- | 369 | nodep->size % sizeof(fat_dentry_t) : |
|
- | 370 | dps; |
|
- | 371 | for (j = 0; j < dentries; j++) { |
|
- | 372 | d = ((fat_dentry_t *)b->data) + j; |
|
- | 373 | switch (fat_classify_dentry(d)) { |
|
- | 374 | case FAT_DENTRY_SKIP: |
|
- | 375 | continue; |
|
- | 376 | case FAT_DENTRY_LAST: |
|
- | 377 | block_put(b); |
|
- | 378 | return false; |
|
- | 379 | default: |
|
- | 380 | case FAT_DENTRY_VALID: |
|
- | 381 | block_put(b); |
|
- | 382 | return true; |
|
- | 383 | } |
|
- | 384 | block_put(b); |
|
- | 385 | return true; |
|
- | 386 | } |
|
- | 387 | block_put(b); |
|
- | 388 | } |
|
- | 389 | ||
- | 390 | return false; |
|
- | 391 | } |
|
- | 392 | ||
335 | static void *fat_root_get(dev_handle_t dev_handle) |
393 | static void *fat_root_get(dev_handle_t dev_handle) |
336 | { |
394 | { |
337 | return fat_node_get(dev_handle, 0, 0); |
395 | return fat_node_get(dev_handle, 0, 0); |
338 | } |
396 | } |
339 | 397 | ||
340 | static char fat_plb_get_char(unsigned pos) |
398 | static char fat_plb_get_char(unsigned pos) |
341 | { |
399 | { |
342 | return fat_reg.plb_ro[pos % PLB_SIZE]; |
400 | return fat_reg.plb_ro[pos % PLB_SIZE]; |
343 | } |
401 | } |
344 | 402 | ||
345 | static bool fat_is_directory(void *node) |
403 | static bool fat_is_directory(void *node) |
346 | { |
404 | { |
347 | return ((fat_node_t *)node)->type == FAT_DIRECTORY; |
405 | return ((fat_node_t *)node)->type == FAT_DIRECTORY; |
348 | } |
406 | } |
349 | 407 | ||
350 | static bool fat_is_file(void *node) |
408 | static bool fat_is_file(void *node) |
351 | { |
409 | { |
352 | return ((fat_node_t *)node)->type == FAT_FILE; |
410 | return ((fat_node_t *)node)->type == FAT_FILE; |
353 | } |
411 | } |
354 | 412 | ||
355 | /** libfs operations */ |
413 | /** libfs operations */ |
356 | libfs_ops_t fat_libfs_ops = { |
414 | libfs_ops_t fat_libfs_ops = { |
357 | .match = fat_match, |
415 | .match = fat_match, |
358 | .node_get = fat_node_get, |
416 | .node_get = fat_node_get, |
359 | .create = NULL, |
417 | .create = NULL, |
360 | .destroy = NULL, |
418 | .destroy = NULL, |
361 | .link = NULL, |
419 | .link = NULL, |
362 | .unlink = NULL, |
420 | .unlink = NULL, |
363 | .index_get = fat_index_get, |
421 | .index_get = fat_index_get, |
364 | .size_get = fat_size_get, |
422 | .size_get = fat_size_get, |
365 | .lnkcnt_get = fat_lnkcnt_get, |
423 | .lnkcnt_get = fat_lnkcnt_get, |
366 | .has_children = NULL, |
424 | .has_children = fat_has_children, |
367 | .root_get = fat_root_get, |
425 | .root_get = fat_root_get, |
368 | .plb_get_char = fat_plb_get_char, |
426 | .plb_get_char = fat_plb_get_char, |
369 | .is_directory = fat_is_directory, |
427 | .is_directory = fat_is_directory, |
370 | .is_file = fat_is_file |
428 | .is_file = fat_is_file |
371 | }; |
429 | }; |
372 | 430 | ||
373 | void fat_lookup(ipc_callid_t rid, ipc_call_t *request) |
431 | void fat_lookup(ipc_callid_t rid, ipc_call_t *request) |
374 | { |
432 | { |
375 | libfs_lookup(&fat_libfs_ops, fat_reg.fs_handle, rid, request); |
433 | libfs_lookup(&fat_libfs_ops, fat_reg.fs_handle, rid, request); |
376 | } |
434 | } |
377 | 435 | ||
378 | /** |
436 | /** |
379 | * @} |
437 | * @} |
380 | */ |
438 | */ |
381 | 439 |