Navigation
- Accueil
- Présentation :
- FAQ
- Bugs et errata
- Contributions de lecteurs
- Téléchargements
- LXR (référencement des sources)
- Mailing-list
- Liens et Projets reliés
Site hébergé par :
Site hébergé par :
|
[ source navigation ] [ diff markup ] [ identifier search ] [ general search ] |
|||
|
||||
001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 018 019 #include <sos/kmalloc.h> 019 #include <sos/kmalloc.h> 020 #include <sos/klibc.h> 020 #include <sos/klibc.h> 021 #include <sos/assert.h> 021 #include <sos/assert.h> 022 #include <sos/list.h> 022 #include <sos/list.h> 023 #include <sos/ksynch.h> 023 #include <sos/ksynch.h> 024 #include <sos/uaccess.h> 024 #include <sos/uaccess.h> 025 #include <sos/physmem.h> 025 #include <sos/physmem.h> 026 026 027 #include <sos/fs.h> 027 #include <sos/fs.h> 028 #include <sos/fs_nscache.h> 028 #include <sos/fs_nscache.h> 029 029 030 #include "fs_virtfs.h" 030 #include "fs_virtfs.h" 031 031 032 /** 032 /** 033 * @file fs_virtfs.c 033 * @file fs_virtfs.c 034 * 034 * 035 * All the sos_fs_nodes and their contents are 035 * All the sos_fs_nodes and their contents are stored in kernel 036 * memory. Thus, with "virtfs", the "disk" is 036 * memory. Thus, with "virtfs", the "disk" is actually the kernel 037 * memory. In a sos_fs_node, the storage_locat 037 * memory. In a sos_fs_node, the storage_location field corresponds to 038 * the kernel address of the corresponding str 038 * the kernel address of the corresponding struct sos_fs_node. 039 * 039 * 040 * Basic kernel-memory virtual FS. Highly UNDE 040 * Basic kernel-memory virtual FS. Highly UNDER-optimized filesystem: 041 * each time we resize a file, a complete real 041 * each time we resize a file, a complete reallocation is done. This 042 * somehow complicates the file mapping, as we 042 * somehow complicates the file mapping, as we cannot do this anyhow 043 * as long as the file is mapped because the k 043 * as long as the file is mapped because the kernel address of the 044 * file contents must NOT change. For that rea 044 * file contents must NOT change. For that reason, we forbid to resize 045 * a file as soon as it is mapped and the file 045 * a file as soon as it is mapped and the file's contents are aligned 046 * on a page boundary in kernel memory (use of 046 * on a page boundary in kernel memory (use of sos_kmem_vmm_alloc 047 * instead of sos_kmalloc). 047 * instead of sos_kmalloc). 048 */ 048 */ 049 049 050 050 051 /** 051 /** 052 * A directory entry, used in virtfs_node of t 052 * A directory entry, used in virtfs_node of type "directory". This is 053 * as simple as a sos_fs_node with a name. 053 * as simple as a sos_fs_node with a name. 054 */ 054 */ 055 struct virtfs_direntry 055 struct virtfs_direntry 056 { 056 { 057 char * name; 057 char * name; 058 struct sos_fs_node * fsnode; 058 struct sos_fs_node * fsnode; 059 059 060 /** 060 /** 061 * Used by readdir to be resilient against c 061 * Used by readdir to be resilient against creat/mkdir/unlink/rmdir 062 * between 2 successive readdirs. Each time 062 * between 2 successive readdirs. Each time a new child to a node is 063 * allocated, a new "creation_order" is uniq 063 * allocated, a new "creation_order" is uniquely attributed. 64bits 064 * should be large enough. 064 * should be large enough. 065 */ 065 */ 066 sos_lcount_t creation_order; 066 sos_lcount_t creation_order; 067 067 068 struct virtfs_direntry * sibling_prev, * sib 068 struct virtfs_direntry * sibling_prev, * sibling_next; 069 }; 069 }; 070 070 071 071 072 /** 072 /** 073 * Structure of a FS file or dir for virtfs. V 073 * Structure of a FS file or dir for virtfs. Virtfs only supports 074 * regular files, directories or symbolic link 074 * regular files, directories or symbolic links: 075 * - regular files correspond to an area in k 075 * - regular files correspond to an area in kernel memory 076 * - directories correspond to a list of virt 076 * - directories correspond to a list of virtfs_direntry 077 * 077 * 078 * Structural inheritance of sos_fs_node: "sup 078 * Structural inheritance of sos_fs_node: "super" is the ancestor (in 079 * "OOP" terms). The "super" field might not b 079 * "OOP" terms). The "super" field might not be the first field: from 080 * a sos_fs_node, the corresponding virtfs_nod 080 * a sos_fs_node, the corresponding virtfs_node is given by the 081 * sos_fs_node::custom_data field 081 * sos_fs_node::custom_data field 082 */ 082 */ 083 struct virtfs_node 083 struct virtfs_node 084 { 084 { 085 /** The ancestor */ 085 /** The ancestor */ 086 struct sos_fs_node super; 086 struct sos_fs_node super; 087 087 088 union 088 union 089 { 089 { 090 /* A file */ 090 /* A file */ 091 struct 091 struct 092 { 092 { 093 /* Contents of the file */ 093 /* Contents of the file */ 094 sos_size_t size; 094 sos_size_t size; 095 void * data; 095 void * data; 096 096 097 /* Yes, the file can be mapped ! */ 097 /* Yes, the file can be mapped ! */ 098 struct sos_umem_vmm_mapped_resource mapr 098 struct sos_umem_vmm_mapped_resource mapres; 099 sos_count_t num_mappings; /**< Forbids t 099 sos_count_t num_mappings; /**< Forbids the region to be resized 100 while it's 100 while it's being mapped, because this 101 woould caus 101 woould cause the underlying data area 102 to be moved 102 to be moved */ 103 } file; 103 } file; 104 104 105 /* A directory */ 105 /* A directory */ 106 struct 106 struct 107 { 107 { 108 /** the children nodes are inserted in F 108 /** the children nodes are inserted in FIFO order. This is 109 important for the readdir function t 109 important for the readdir function to be resilient against 110 mkdir/rmdir/creat/unlink */ 110 mkdir/rmdir/creat/unlink */ 111 struct virtfs_direntry * list_entries; 111 struct virtfs_direntry * list_entries; 112 112 113 /** Used by readdir to remember the last 113 /** Used by readdir to remember the last unique "creation order" 114 attributed */ 114 attributed */ 115 sos_lcount_t top_creation_order; 115 sos_lcount_t top_creation_order; 116 } dir; 116 } dir; 117 }; /* Anonymous union (gcc extension) */ 117 }; /* Anonymous union (gcc extension) */ 118 118 119 /* The virtfs nodes are chained */ 119 /* The virtfs nodes are chained */ 120 struct virtfs_node * prev, * next; 120 struct virtfs_node * prev, * next; 121 }; 121 }; 122 122 123 123 124 /** 124 /** 125 * A virtfs FS instance 125 * A virtfs FS instance 126 * 126 * 127 * Structural inheritance of sos_fs_manager_in 127 * Structural inheritance of sos_fs_manager_instance: "super" is the 128 * ancestor (in "OOP" terms). The "super" fiel 128 * ancestor (in "OOP" terms). The "super" field might not be the first 129 * field: from a sos_fs_manager_instance, the 129 * field: from a sos_fs_manager_instance, the corresponding 130 * virtfs_instance is given by the 130 * virtfs_instance is given by the 131 * sos_fs_manager_instance::custom_data field 131 * sos_fs_manager_instance::custom_data field 132 */ 132 */ 133 struct virtfs_instance 133 struct virtfs_instance 134 { 134 { 135 /** Ancestor */ 135 /** Ancestor */ 136 struct sos_fs_manager_instance super; 136 struct sos_fs_manager_instance super; 137 137 138 /** For the serialization of virtfs "disk" ( 138 /** For the serialization of virtfs "disk" (ie kernel memory) 139 accesses */ 139 accesses */ 140 struct sos_kmutex lock; 140 struct sos_kmutex lock; 141 141 142 /** The list of virtfs nodes "on disk" (ie i 142 /** The list of virtfs nodes "on disk" (ie in kernel memory) */ 143 struct virtfs_node * list_fsnodes; 143 struct virtfs_node * list_fsnodes; 144 }; 144 }; 145 145 146 146 147 /** The description of the "Virtual FS" */ 147 /** The description of the "Virtual FS" */ 148 static struct sos_fs_manager_type virtfs_type; 148 static struct sos_fs_manager_type virtfs_type; 149 149 150 150 151 /* ********** Forward declarations */ 151 /* ********** Forward declarations */ 152 static sos_ret_t virtfs_mount(struct sos_fs_ma 152 static sos_ret_t virtfs_mount(struct sos_fs_manager_type * this, 153 struct sos_fs_no 153 struct sos_fs_node * device, 154 const char * arg 154 const char * args, 155 struct sos_fs_ma 155 struct sos_fs_manager_instance ** mounted_fs); 156 156 157 157 158 static sos_ret_t virtfs_umount(struct sos_fs_m 158 static sos_ret_t virtfs_umount(struct sos_fs_manager_type * this, 159 struct sos_fs_m 159 struct sos_fs_manager_instance * mounted_fs); 160 160 161 161 162 static sos_ret_t virtfs_new_mapping(struct sos 162 static sos_ret_t virtfs_new_mapping(struct sos_umem_vmm_vr *vr); 163 163 164 164 165 sos_ret_t sos_fs_virtfs_subsystem_setup() 165 sos_ret_t sos_fs_virtfs_subsystem_setup() 166 { 166 { 167 strzcpy(virtfs_type.name, "virtfs", SOS_FS_M 167 strzcpy(virtfs_type.name, "virtfs", SOS_FS_MANAGER_NAME_MAXLEN); 168 virtfs_type.mount = virtfs_mount; 168 virtfs_type.mount = virtfs_mount; 169 virtfs_type.umount = virtfs_umount; 169 virtfs_type.umount = virtfs_umount; 170 170 171 return sos_fs_register_fs_type(& virtfs_type 171 return sos_fs_register_fs_type(& virtfs_type); 172 } 172 } 173 173 174 174 175 /* ******************************************* 175 /* ******************************************************** 176 * Helper functions 176 * Helper functions 177 */ 177 */ 178 178 179 179 180 /* Helper function to serialize "disk" accesse 180 /* Helper function to serialize "disk" accesses */ 181 inline static void virtfs_lock(struct virtfs_n 181 inline static void virtfs_lock(struct virtfs_node *a_node) 182 { 182 { 183 struct virtfs_instance * fs = (struct virtfs 183 struct virtfs_instance * fs = (struct virtfs_instance*)a_node->super.fs->custom_data; 184 sos_kmutex_lock(& fs->lock, NULL); 184 sos_kmutex_lock(& fs->lock, NULL); 185 } 185 } 186 186 187 187 188 /* Helper function to serialize "disk" accesse 188 /* Helper function to serialize "disk" accesses */ 189 inline static void virtfs_unlock(struct virtfs 189 inline static void virtfs_unlock(struct virtfs_node *a_node) 190 { 190 { 191 struct virtfs_instance * fs = (struct virtfs 191 struct virtfs_instance * fs = (struct virtfs_instance*)a_node->super.fs->custom_data; 192 sos_kmutex_unlock(& fs->lock); 192 sos_kmutex_unlock(& fs->lock); 193 } 193 } 194 194 195 195 196 /* Helper function to resize the given virts n 196 /* Helper function to resize the given virts node (ie kernel memory 197 reallocation) */ 197 reallocation) */ 198 static sos_ret_t virtfs_resize(struct virtfs_n 198 static sos_ret_t virtfs_resize(struct virtfs_node *this, 199 sos_size_t new_ 199 sos_size_t new_size) 200 { 200 { 201 void * new_data = NULL; 201 void * new_data = NULL; 202 202 203 if (this->file.size == new_size) 203 if (this->file.size == new_size) 204 return SOS_OK; 204 return SOS_OK; 205 205 206 /* Don't allow to resize the region when the 206 /* Don't allow to resize the region when the file is being mapped */ 207 if (this->file.num_mappings > 0) 207 if (this->file.num_mappings > 0) 208 return -SOS_EBUSY; 208 return -SOS_EBUSY; 209 209 210 if (new_size > 0) 210 if (new_size > 0) 211 { 211 { 212 /* Use kmem_vmm_alloc instead of kmalloc 212 /* Use kmem_vmm_alloc instead of kmalloc to make sure the data 213 WILL be page-aligned (needed by file 213 WILL be page-aligned (needed by file mapping stuff) */ 214 sos_ui32_t npages = SOS_PAGE_ALIGN_SUP(n 214 sos_ui32_t npages = SOS_PAGE_ALIGN_SUP(new_size) / SOS_PAGE_SIZE; 215 new_data = (void*)sos_kmem_vmm_alloc(npa 215 new_data = (void*)sos_kmem_vmm_alloc(npages, 216 SOS 216 SOS_KMEM_VMM_MAP); 217 if (! new_data) 217 if (! new_data) 218 return -SOS_OK; 218 return -SOS_OK; 219 } 219 } 220 220 221 /* Copy the data to its new location */ 221 /* Copy the data to its new location */ 222 if (this->file.size < new_size) 222 if (this->file.size < new_size) 223 { 223 { 224 if (this->file.size > 0) 224 if (this->file.size > 0) 225 memcpy(new_data, this->file.data, this 225 memcpy(new_data, this->file.data, this->file.size); 226 if (new_size > this->file.size) 226 if (new_size > this->file.size) 227 memset(new_data + this->file.size, 0x0 227 memset(new_data + this->file.size, 0x0, 228 new_size - this->file.size); 228 new_size - this->file.size); 229 } 229 } 230 else if (new_size > 0) 230 else if (new_size > 0) 231 memcpy(new_data, this->file.data, new_size 231 memcpy(new_data, this->file.data, new_size); 232 232 233 if (this->file.data) 233 if (this->file.data) 234 sos_kfree((sos_vaddr_t)this->file.data); 234 sos_kfree((sos_vaddr_t)this->file.data); 235 this->file.data = new_data; 235 this->file.data = new_data; 236 this->file.size = new_size; 236 this->file.size = new_size; 237 237 238 return SOS_OK; 238 return SOS_OK; 239 } 239 } 240 240 241 241 242 /* ******************************************* 242 /* ******************************************************** 243 * Opened file operations 243 * Opened file operations 244 */ 244 */ 245 245 246 246 247 static sos_ret_t 247 static sos_ret_t 248 virtfs_duplicate_opened_file(struct sos_fs_ope 248 virtfs_duplicate_opened_file(struct sos_fs_opened_file *this, 249 const struct sos_ 249 const struct sos_process * for_owner, 250 struct sos_fs_ope 250 struct sos_fs_opened_file **result) 251 { 251 { 252 *result = (struct sos_fs_opened_file*) 252 *result = (struct sos_fs_opened_file*) 253 sos_kmalloc(sizeof(struct sos_fs_opened_fi 253 sos_kmalloc(sizeof(struct sos_fs_opened_file), 0); 254 if (! *result) 254 if (! *result) 255 return -SOS_ENOMEM; 255 return -SOS_ENOMEM; 256 256 257 memcpy(*result, this, sizeof(*this)); 257 memcpy(*result, this, sizeof(*this)); 258 (*result)->owner = for_owner; 258 (*result)->owner = for_owner; 259 return SOS_OK; 259 return SOS_OK; 260 } 260 } 261 261 262 262 263 static sos_ret_t 263 static sos_ret_t 264 virtfs_seek(struct sos_fs_opened_file *this, 264 virtfs_seek(struct sos_fs_opened_file *this, 265 sos_lsoffset_t offset, 265 sos_lsoffset_t offset, 266 sos_seek_whence_t whence, 266 sos_seek_whence_t whence, 267 /* out */ sos_lsoffset_t * result_ 267 /* out */ sos_lsoffset_t * result_position) 268 { 268 { 269 sos_lsoffset_t ref_offs; 269 sos_lsoffset_t ref_offs; 270 struct virtfs_node * virtfsnode; 270 struct virtfs_node * virtfsnode; 271 271 272 virtfsnode = (struct virtfs_node*) 272 virtfsnode = (struct virtfs_node*) 273 sos_fs_nscache_get_fs_node(this->direntry) 273 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 274 274 275 if ( (virtfsnode->super.type != SOS_FS_NODE_ 275 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 276 && (virtfsnode->super.type != SOS_FS_NO 276 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 277 return -SOS_ENOSUP; 277 return -SOS_ENOSUP; 278 278 279 *result_position = this->position; 279 *result_position = this->position; 280 switch (whence) 280 switch (whence) 281 { 281 { 282 case SOS_SEEK_SET: 282 case SOS_SEEK_SET: 283 ref_offs = 0; 283 ref_offs = 0; 284 break; 284 break; 285 285 286 case SOS_SEEK_CUR: 286 case SOS_SEEK_CUR: 287 ref_offs = this->position; 287 ref_offs = this->position; 288 break; 288 break; 289 289 290 case SOS_SEEK_END: 290 case SOS_SEEK_END: 291 ref_offs = virtfsnode->file.size; 291 ref_offs = virtfsnode->file.size; 292 break; 292 break; 293 293 294 default: 294 default: 295 return -SOS_EINVAL; 295 return -SOS_EINVAL; 296 } 296 } 297 297 298 if (offset < -ref_offs) 298 if (offset < -ref_offs) 299 return -SOS_EINVAL; 299 return -SOS_EINVAL; 300 300 301 this->position = ref_offs + offset; 301 this->position = ref_offs + offset; 302 *result_position = this->position; 302 *result_position = this->position; 303 return SOS_OK; 303 return SOS_OK; 304 } 304 } 305 305 306 306 307 static sos_ret_t virtfs_read(struct sos_fs_ope 307 static sos_ret_t virtfs_read(struct sos_fs_opened_file *this, 308 sos_uaddr_t dest_ 308 sos_uaddr_t dest_buf, 309 sos_size_t * /* i 309 sos_size_t * /* in/out */len) 310 { 310 { 311 sos_ret_t retval; 311 sos_ret_t retval; 312 struct virtfs_node * virtfsnode; 312 struct virtfs_node * virtfsnode; 313 313 314 virtfsnode = (struct virtfs_node*) 314 virtfsnode = (struct virtfs_node*) 315 sos_fs_nscache_get_fs_node(this->direntry) 315 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 316 316 317 if ( (virtfsnode->super.type != SOS_FS_NODE_ 317 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 318 && (virtfsnode->super.type != SOS_FS_NO 318 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 319 return -SOS_ENOSUP; 319 return -SOS_ENOSUP; 320 320 321 if (this->position >= virtfsnode->file.size) 321 if (this->position >= virtfsnode->file.size) 322 { 322 { 323 *len = 0; 323 *len = 0; 324 return SOS_OK; 324 return SOS_OK; 325 } 325 } 326 326 327 virtfs_lock(virtfsnode); 327 virtfs_lock(virtfsnode); 328 328 329 if (this->position + *len >= virtfsnode->fil 329 if (this->position + *len >= virtfsnode->file.size) 330 *len = virtfsnode->file.size - this->posit 330 *len = virtfsnode->file.size - this->position; 331 331 332 retval = sos_memcpy_to_user(dest_buf, 332 retval = sos_memcpy_to_user(dest_buf, 333 ((sos_vaddr_t)vi 333 ((sos_vaddr_t)virtfsnode->file.data) 334 + this->position 334 + this->position, 335 *len); 335 *len); 336 if (retval < 0) 336 if (retval < 0) 337 { 337 { 338 virtfs_unlock(virtfsnode); 338 virtfs_unlock(virtfsnode); 339 return retval; 339 return retval; 340 } 340 } 341 341 342 this->position += retval; 342 this->position += retval; 343 *len = retval; 343 *len = retval; 344 344 345 virtfs_unlock(virtfsnode); 345 virtfs_unlock(virtfsnode); 346 346 347 return SOS_OK; 347 return SOS_OK; 348 } 348 } 349 349 350 350 351 static sos_ret_t virtfs_write(struct sos_fs_op 351 static sos_ret_t virtfs_write(struct sos_fs_opened_file *this, 352 sos_uaddr_t src_b 352 sos_uaddr_t src_buf, 353 sos_size_t * /* i 353 sos_size_t * /* in/out */len) 354 { 354 { 355 sos_ret_t retval; 355 sos_ret_t retval; 356 struct virtfs_node * virtfsnode; 356 struct virtfs_node * virtfsnode; 357 357 358 virtfsnode = (struct virtfs_node*) 358 virtfsnode = (struct virtfs_node*) 359 sos_fs_nscache_get_fs_node(this->direntry) 359 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 360 360 361 if ( (virtfsnode->super.type != SOS_FS_NODE_ 361 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 362 && (virtfsnode->super.type != SOS_FS_NO 362 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 363 return -SOS_ENOSUP; 363 return -SOS_ENOSUP; 364 364 365 virtfs_lock(virtfsnode); 365 virtfs_lock(virtfsnode); 366 if (this->position + *len >= virtfsnode->fil 366 if (this->position + *len >= virtfsnode->file.size) 367 { 367 { 368 /* Try to resize if needed */ 368 /* Try to resize if needed */ 369 if (SOS_OK != virtfs_resize(virtfsnode, 369 if (SOS_OK != virtfs_resize(virtfsnode, this->position + *len)) 370 *len = virtfsnode->file.size - this->p 370 *len = virtfsnode->file.size - this->position; 371 } 371 } 372 372 373 retval = sos_memcpy_from_user(((sos_vaddr_t) 373 retval = sos_memcpy_from_user(((sos_vaddr_t)virtfsnode->file.data) 374 + this->posi 374 + this->position, 375 src_buf, 375 src_buf, 376 *len); 376 *len); 377 if (retval < 0) 377 if (retval < 0) 378 { 378 { 379 virtfs_unlock(virtfsnode); 379 virtfs_unlock(virtfsnode); 380 return retval; 380 return retval; 381 } 381 } 382 382 383 this->position += retval; 383 this->position += retval; 384 *len = retval; 384 *len = retval; 385 385 386 virtfs_unlock(virtfsnode); 386 virtfs_unlock(virtfsnode); 387 387 388 return SOS_OK; 388 return SOS_OK; 389 } 389 } 390 390 391 391 392 static sos_ret_t virtfs_mmap(struct sos_fs_ope 392 static sos_ret_t virtfs_mmap(struct sos_fs_opened_file *this, 393 sos_uaddr_t *uadd 393 sos_uaddr_t *uaddr, sos_size_t size, 394 sos_ui32_t access 394 sos_ui32_t access_rights, 395 sos_ui32_t flags, 395 sos_ui32_t flags, 396 sos_luoffset_t of 396 sos_luoffset_t offset) 397 { 397 { 398 struct virtfs_node * virtfsnode; 398 struct virtfs_node * virtfsnode; 399 399 400 virtfsnode = (struct virtfs_node*) 400 virtfsnode = (struct virtfs_node*) 401 sos_fs_nscache_get_fs_node(this->direntry) 401 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 402 402 403 if (virtfsnode->super.type != SOS_FS_NODE_RE 403 if (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 404 return -SOS_ENOSUP; 404 return -SOS_ENOSUP; 405 405 406 return sos_umem_vmm_map(sos_process_get_addr 406 return sos_umem_vmm_map(sos_process_get_address_space(this->owner), 407 uaddr, size, access_ 407 uaddr, size, access_rights, 408 flags, & virtfsnode- 408 flags, & virtfsnode->file.mapres, offset); 409 } 409 } 410 410 411 411 412 static sos_ret_t virtfs_readdir(struct sos_fs_ 412 static sos_ret_t virtfs_readdir(struct sos_fs_opened_file *this, 413 struct sos_fs_ 413 struct sos_fs_dirent * result) 414 { 414 { 415 /* For directories, "position" indicates the 415 /* For directories, "position" indicates the "creation_order" of the 416 last readdir operation, and "custom_data" 416 last readdir operation, and "custom_data" indicates the address 417 of the last directory entry */ 417 of the last directory entry */ 418 418 419 struct virtfs_direntry * direntry, * next_di 419 struct virtfs_direntry * direntry, * next_direntry; 420 struct virtfs_node * virtfsnode; 420 struct virtfs_node * virtfsnode; 421 int nb; 421 int nb; 422 422 423 virtfsnode = (struct virtfs_node*) 423 virtfsnode = (struct virtfs_node*) 424 sos_fs_nscache_get_fs_node(this->direntry) 424 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 425 next_direntry = NULL; 425 next_direntry = NULL; 426 426 427 /* If the "generation" of the node did not c 427 /* If the "generation" of the node did not change, the next direntry 428 is the next in the list. We can safely do 428 is the next in the list. We can safely do this because the list 429 of direntries is sorted in increasing cre 429 of direntries is sorted in increasing creation_order. */ 430 if ((this->generation == virtfsnode->super.g 430 if ((this->generation == virtfsnode->super.generation) 431 && (this->custom_data != NULL)) 431 && (this->custom_data != NULL)) 432 { 432 { 433 direntry = (struct virtfs_direntry*)this 433 direntry = (struct virtfs_direntry*)this->custom_data; 434 next_direntry = direntry->sibling_next; 434 next_direntry = direntry->sibling_next; 435 435 436 /* Did we go past the end of the list ? 436 /* Did we go past the end of the list ? */ 437 if (next_direntry == list_get_head_named 437 if (next_direntry == list_get_head_named(virtfsnode->dir.list_entries, 438 438 sibling_prev, sibling_next)) 439 next_direntry = NULL; 439 next_direntry = NULL; 440 } 440 } 441 else 441 else 442 /* Otherwise we have to lookup the next en 442 /* Otherwise we have to lookup the next entry manually */ 443 { 443 { 444 /* Lookup the entry that has next creati 444 /* Lookup the entry that has next creation_order */ 445 next_direntry = NULL; 445 next_direntry = NULL; 446 list_foreach_forward_named(virtfsnode->d 446 list_foreach_forward_named(virtfsnode->dir.list_entries, 447 direntry, nb, 447 direntry, nb, 448 sibling_prev, 448 sibling_prev, sibling_next) 449 { 449 { 450 if (direntry->creation_order <= this 450 if (direntry->creation_order <= this->position) 451 continue; 451 continue; 452 452 453 if (! next_direntry) 453 if (! next_direntry) 454 { 454 { 455 next_direntry = direntry; 455 next_direntry = direntry; 456 continue; 456 continue; 457 } 457 } 458 458 459 if (direntry->creation_order < next_ 459 if (direntry->creation_order < next_direntry->creation_order) 460 next_direntry = direntry; 460 next_direntry = direntry; 461 } 461 } 462 } 462 } 463 463 464 if (! next_direntry) 464 if (! next_direntry) 465 { 465 { 466 this->custom_data = NULL; 466 this->custom_data = NULL; 467 this->position = 0; 467 this->position = 0; 468 return -SOS_ENOENT; 468 return -SOS_ENOENT; 469 } 469 } 470 470 471 /* Update the result */ 471 /* Update the result */ 472 result->storage_location = ((sos_vaddr_t)ne 472 result->storage_location = ((sos_vaddr_t)next_direntry->fsnode); 473 result->offset_in_dirfile = next_direntry->c 473 result->offset_in_dirfile = next_direntry->creation_order; 474 result->type = next_direntry->f 474 result->type = next_direntry->fsnode->type; 475 result->namelen = strnlen(next_dir 475 result->namelen = strnlen(next_direntry->name, 476 SOS_FS_D 476 SOS_FS_DIRENT_NAME_MAXLEN); 477 strzcpy(result->name, next_direntry->name, S 477 strzcpy(result->name, next_direntry->name, SOS_FS_DIRENT_NAME_MAXLEN); 478 478 479 /* Update the custom data */ 479 /* Update the custom data */ 480 this->position = next_direntry->creation_ 480 this->position = next_direntry->creation_order; 481 this->custom_data = next_direntry; 481 this->custom_data = next_direntry; 482 482 483 return SOS_OK; 483 return SOS_OK; 484 } 484 } 485 485 486 486 487 static struct sos_fs_ops_opened_file virtfs_op 487 static struct sos_fs_ops_opened_file virtfs_ops_opened_file = 488 (struct sos_fs_ops_opened_file){ 488 (struct sos_fs_ops_opened_file){ 489 .seek = virtfs_seek, 489 .seek = virtfs_seek, 490 .read = virtfs_read, 490 .read = virtfs_read, 491 .write = virtfs_write, 491 .write = virtfs_write, 492 .mmap = virtfs_mmap 492 .mmap = virtfs_mmap 493 }; 493 }; 494 494 495 495 496 static struct sos_fs_ops_opened_dir virtfs_ops 496 static struct sos_fs_ops_opened_dir virtfs_ops_opened_dir = 497 (struct sos_fs_ops_opened_dir){ 497 (struct sos_fs_ops_opened_dir){ 498 .readdir = virtfs_readdir 498 .readdir = virtfs_readdir 499 }; 499 }; 500 500 501 501 502 /* ******************************************* 502 /* ******************************************************** 503 * FS node operations 503 * FS node operations 504 */ 504 */ 505 505 506 static sos_ret_t virtfs_stat_node(struct sos_f 506 static sos_ret_t virtfs_stat_node(struct sos_fs_node * this, 507 struct sos_f 507 struct sos_fs_stat * result) 508 { 508 { 509 struct virtfs_node * virtfsnode = (struct vi 509 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 510 result->st_type = this->type; !! 510 511 result->st_storage_location = this->storage_ !! 511 /* Establish the major/minor fields */ 512 result->st_access_rights = this->access_r !! 512 result->st_rdev.device_class = 0; 513 result->st_nlink = this->ondisk_l !! 513 result->st_rdev.device_instance = 0; >> 514 if (this->type == SOS_FS_NODE_DEVICE_CHAR) >> 515 { >> 516 /* If the current node is a special device: get the major/minor >> 517 directly from it */ >> 518 result->st_rdev.device_class = this->dev_id.device_class; >> 519 result->st_rdev.device_instance = this->dev_id.device_instance; >> 520 } >> 521 else >> 522 { >> 523 /* Otherwise, retrieve it from the device that it is mounted >> 524 on (might not exist...) */ >> 525 struct sos_fs_node * rootdev = this->fs->device; >> 526 if (rootdev) >> 527 { >> 528 result->st_rdev.device_class = rootdev->dev_id.device_class; >> 529 result->st_rdev.device_instance = rootdev->dev_id.device_instance; >> 530 } >> 531 } >> 532 >> 533 result->st_type = this->type; >> 534 result->st_storage_location = this->storage_location; >> 535 result->st_access_rights = this->access_rights; >> 536 result->st_nlink = this->ondisk_lnk_cnt; 514 if (this->type == SOS_FS_NODE_REGULAR_FILE) 537 if (this->type == SOS_FS_NODE_REGULAR_FILE) 515 result->st_size = virtfsnode->fi !! 538 result->st_size = virtfsnode->file.size; 516 else 539 else 517 result->st_size = 0; !! 540 result->st_size = 0; 518 return SOS_OK; 541 return SOS_OK; 519 } 542 } 520 543 521 544 522 static sos_ret_t virtfs_truncate(struct sos_fs 545 static sos_ret_t virtfs_truncate(struct sos_fs_node *this, 523 sos_lsoffset_ 546 sos_lsoffset_t length) 524 { 547 { 525 sos_ret_t retval; 548 sos_ret_t retval; 526 struct virtfs_node * virtfsnode; 549 struct virtfs_node * virtfsnode; 527 550 528 virtfsnode = (struct virtfs_node*) this->cus 551 virtfsnode = (struct virtfs_node*) this->custom_data; 529 552 530 if ( (virtfsnode->super.type != SOS_FS_NODE_ 553 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 531 && (virtfsnode->super.type != SOS_FS_NO 554 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 532 return -SOS_ENOSUP; 555 return -SOS_ENOSUP; 533 556 534 virtfs_lock(virtfsnode); 557 virtfs_lock(virtfsnode); 535 retval = virtfs_resize(virtfsnode, length); 558 retval = virtfs_resize(virtfsnode, length); 536 virtfs_unlock(virtfsnode); 559 virtfs_unlock(virtfsnode); 537 560 538 return retval; 561 return retval; 539 } 562 } 540 563 541 564 542 static sos_ret_t virtfs_sync_node(struct sos_f 565 static sos_ret_t virtfs_sync_node(struct sos_fs_node *this) 543 { 566 { 544 /* No backing store for virtfs */ 567 /* No backing store for virtfs */ 545 return SOS_OK; 568 return SOS_OK; 546 } 569 } 547 570 548 571 549 static sos_ret_t virtfs_chmod_node(struct sos_ 572 static sos_ret_t virtfs_chmod_node(struct sos_fs_node * this, 550 sos_ui32_t 573 sos_ui32_t access_rights) 551 { 574 { 552 this->access_rights = access_rights; 575 this->access_rights = access_rights; 553 return SOS_OK; 576 return SOS_OK; 554 } 577 } 555 578 556 579 557 /** Callback when nothing (in particular no so 580 /** Callback when nothing (in particular no sos_fs_nscache_node) make 558 reference to the node */ 581 reference to the node */ 559 static sos_ret_t virtfs_node_destructor(struct 582 static sos_ret_t virtfs_node_destructor(struct sos_fs_node * this) 560 { 583 { 561 /* This callback is called only when the fsn 584 /* This callback is called only when the fsnode is not needed 562 anymore by any process or by the kernel. 585 anymore by any process or by the kernel. But the node must remain 563 stored "on disk" as long as the FS is mou 586 stored "on disk" as long as the FS is mounted AND the node is 564 still "on disk" */ 587 still "on disk" */ 565 if (this->ondisk_lnk_cnt <= 0) 588 if (this->ondisk_lnk_cnt <= 0) 566 { 589 { 567 struct virtfs_instance * virtfs = (struc 590 struct virtfs_instance * virtfs = (struct virtfs_instance*)this->fs->custom_data; 568 struct virtfs_node * virtfsnode = (struc 591 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 569 592 570 list_delete(virtfs->list_fsnodes, virtfs 593 list_delete(virtfs->list_fsnodes, virtfsnode); 571 sos_kfree((sos_vaddr_t) this->custom_dat 594 sos_kfree((sos_vaddr_t) this->custom_data); 572 } 595 } 573 596 574 return SOS_OK; 597 return SOS_OK; 575 } 598 } 576 599 577 600 578 static struct sos_fs_node_ops_file virtfs_ops_ 601 static struct sos_fs_node_ops_file virtfs_ops_file = 579 (struct sos_fs_node_ops_file){ 602 (struct sos_fs_node_ops_file){ 580 .truncate = virtfs_truncate, 603 .truncate = virtfs_truncate, 581 .stat = virtfs_stat_node, 604 .stat = virtfs_stat_node, 582 .sync = virtfs_sync_node, << 583 .chmod = virtfs_chmod_node 605 .chmod = virtfs_chmod_node 584 }; 606 }; 585 607 586 608 587 static sos_ret_t virtfs_new_opened_file(struct 609 static sos_ret_t virtfs_new_opened_file(struct sos_fs_node * this, 588 const 610 const struct sos_process * owner, 589 sos_ui 611 sos_ui32_t open_flags, 590 struct 612 struct sos_fs_opened_file ** result_of) 591 { 613 { 592 struct sos_fs_opened_file * of 614 struct sos_fs_opened_file * of 593 = (struct sos_fs_opened_file*)sos_kmalloc( 615 = (struct sos_fs_opened_file*)sos_kmalloc(sizeof(*of), 0); 594 if (! of) 616 if (! of) 595 return -SOS_ENOMEM; 617 return -SOS_ENOMEM; 596 618 597 memset(of, 0x0, sizeof(*of)); 619 memset(of, 0x0, sizeof(*of)); 598 of->owner = owner; 620 of->owner = owner; 599 of->duplicate = virtfs_duplicate_opened_fil 621 of->duplicate = virtfs_duplicate_opened_file; 600 of->open_flags = open_flags; 622 of->open_flags = open_flags; 601 of->ops_file = & virtfs_ops_opened_file; 623 of->ops_file = & virtfs_ops_opened_file; 602 if (this->type == SOS_FS_NODE_DIRECTORY) 624 if (this->type == SOS_FS_NODE_DIRECTORY) 603 of->ops_dir = & virtfs_ops_opened_dir; 625 of->ops_dir = & virtfs_ops_opened_dir; 604 626 605 *result_of = of; 627 *result_of = of; 606 return SOS_OK; 628 return SOS_OK; 607 } 629 } 608 630 609 631 610 static sos_ret_t virtfs_close_opened_file(stru 632 static sos_ret_t virtfs_close_opened_file(struct sos_fs_node * this, 611 stru 633 struct sos_fs_opened_file * of) 612 { 634 { 613 sos_kfree((sos_vaddr_t)of); 635 sos_kfree((sos_vaddr_t)of); 614 return SOS_OK; 636 return SOS_OK; 615 } 637 } 616 638 617 639 618 static sos_ret_t virtfs_symlink_expand(struct 640 static sos_ret_t virtfs_symlink_expand(struct sos_fs_node *this, 619 char co 641 char const ** target, 620 sos_siz 642 sos_size_t * target_len) 621 { 643 { 622 struct virtfs_node * virtfsnode = (struct vi 644 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 623 645 624 *target = virtfsnode->file.data; 646 *target = virtfsnode->file.data; 625 *target_len = virtfsnode->file.size; 647 *target_len = virtfsnode->file.size; 626 648 627 return SOS_OK; 649 return SOS_OK; 628 } 650 } 629 651 630 652 631 static struct sos_fs_node_ops_symlink virtfs_o 653 static struct sos_fs_node_ops_symlink virtfs_ops_symlink 632 = (struct sos_fs_node_ops_symlink){ 654 = (struct sos_fs_node_ops_symlink){ 633 .expand = virtfs_symlink_expand 655 .expand = virtfs_symlink_expand 634 }; 656 }; 635 657 636 658 637 static sos_ret_t virtfs_dir_lookup(struct sos_ 659 static sos_ret_t virtfs_dir_lookup(struct sos_fs_node *this, 638 const char 660 const char * name, sos_ui16_t namelen, 639 sos_ui64_t 661 sos_ui64_t * result_storage_location) 640 { 662 { 641 struct virtfs_node * virtfsnode = (struct vi 663 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 642 struct virtfs_direntry * direntry; 664 struct virtfs_direntry * direntry; 643 int nbentries; 665 int nbentries; 644 666 645 list_foreach_forward_named(virtfsnode->dir.l 667 list_foreach_forward_named(virtfsnode->dir.list_entries, 646 direntry, nbentri 668 direntry, nbentries, 647 sibling_prev, sib 669 sibling_prev, sibling_next) 648 { 670 { 649 if (!memcmp(name, direntry->name, namele 671 if (!memcmp(name, direntry->name, namelen) && !direntry->name[namelen]) 650 { 672 { 651 *result_storage_location = direntry- 673 *result_storage_location = direntry->fsnode->storage_location; 652 return SOS_OK; 674 return SOS_OK; 653 } 675 } 654 } 676 } 655 677 656 return -SOS_ENOENT; 678 return -SOS_ENOENT; 657 } 679 } 658 680 659 681 660 static sos_ret_t virtfs_link(struct sos_fs_nod 682 static sos_ret_t virtfs_link(struct sos_fs_node *this, 661 const struct sos_ 683 const struct sos_process *actor, 662 const char * entr 684 const char * entry_name, sos_ui16_t entry_namelen, 663 struct sos_fs_nod 685 struct sos_fs_node * node) 664 { 686 { 665 struct virtfs_node * parent = (struct virtfs 687 struct virtfs_node * parent = (struct virtfs_node*)this->custom_data; 666 struct virtfs_direntry * direntry; 688 struct virtfs_direntry * direntry; 667 689 668 direntry = (struct virtfs_direntry*)sos_kmal 690 direntry = (struct virtfs_direntry*)sos_kmalloc(sizeof(*direntry), 0); 669 if (! direntry) 691 if (! direntry) 670 return -SOS_ENOMEM; 692 return -SOS_ENOMEM; 671 693 672 direntry->name = (char*)sos_kmalloc(entry_na 694 direntry->name = (char*)sos_kmalloc(entry_namelen + 1, 0); 673 if (! direntry->name) 695 if (! direntry->name) 674 { 696 { 675 sos_kfree((sos_vaddr_t)direntry->name); 697 sos_kfree((sos_vaddr_t)direntry->name); 676 return -SOS_ENOMEM; 698 return -SOS_ENOMEM; 677 } 699 } 678 700 679 memcpy(direntry->name, entry_name, entry_nam 701 memcpy(direntry->name, entry_name, entry_namelen); 680 direntry->name[entry_namelen] = '\0'; 702 direntry->name[entry_namelen] = '\0'; 681 703 682 direntry->fsnode = node; 704 direntry->fsnode = node; 683 node->ondisk_lnk_cnt ++; 705 node->ondisk_lnk_cnt ++; 684 this->ondisk_lnk_cnt ++; 706 this->ondisk_lnk_cnt ++; 685 list_add_tail_named(parent->dir.list_entries 707 list_add_tail_named(parent->dir.list_entries, direntry, 686 sibling_prev, sibling_ne 708 sibling_prev, sibling_next); 687 709 688 /* Update the index of the new entry in orde 710 /* Update the index of the new entry in order for the next readdirs 689 to fetch this new entry */ 711 to fetch this new entry */ 690 parent->dir.top_creation_order ++; 712 parent->dir.top_creation_order ++; 691 direntry->creation_order = parent->dir.top_c 713 direntry->creation_order = parent->dir.top_creation_order; 692 714 693 return SOS_OK; 715 return SOS_OK; 694 } 716 } 695 717 696 718 697 static sos_ret_t 719 static sos_ret_t 698 virtfs_unlink(struct sos_fs_node *this, 720 virtfs_unlink(struct sos_fs_node *this, 699 const struct sos_process *actor, 721 const struct sos_process *actor, 700 const char * entry_name, sos_ui1 722 const char * entry_name, sos_ui16_t entry_namelen) 701 { 723 { 702 struct virtfs_node * parent = (struct virtfs 724 struct virtfs_node * parent = (struct virtfs_node*)this->custom_data; 703 struct virtfs_direntry * direntry; 725 struct virtfs_direntry * direntry; 704 int nbentries; 726 int nbentries; 705 727 706 list_foreach_forward_named(parent->dir.list_ 728 list_foreach_forward_named(parent->dir.list_entries, 707 direntry, nbentri 729 direntry, nbentries, 708 sibling_prev, sib 730 sibling_prev, sibling_next) 709 { 731 { 710 if (!memcmp(entry_name, direntry->name, 732 if (!memcmp(entry_name, direntry->name, entry_namelen) 711 && !direntry->name[entry_namelen]) 733 && !direntry->name[entry_namelen]) 712 { 734 { 713 list_delete_named(parent->dir.list_e 735 list_delete_named(parent->dir.list_entries, direntry, 714 sibling_prev, sibl 736 sibling_prev, sibling_next); 715 direntry->fsnode->ondisk_lnk_cnt --; 737 direntry->fsnode->ondisk_lnk_cnt --; 716 this->ondisk_lnk_cnt --; 738 this->ondisk_lnk_cnt --; 717 sos_kfree((sos_vaddr_t)direntry); 739 sos_kfree((sos_vaddr_t)direntry); 718 return SOS_OK; 740 return SOS_OK; 719 } 741 } 720 } 742 } 721 743 722 return -SOS_ENOENT; 744 return -SOS_ENOENT; 723 } 745 } 724 746 725 747 726 static struct sos_fs_node_ops_dir virtfs_ops_d 748 static struct sos_fs_node_ops_dir virtfs_ops_dir 727 = (struct sos_fs_node_ops_dir){ 749 = (struct sos_fs_node_ops_dir){ 728 .lookup = virtfs_dir_lookup, 750 .lookup = virtfs_dir_lookup, 729 .link = virtfs_link, 751 .link = virtfs_link, 730 .unlink = virtfs_unlink 752 .unlink = virtfs_unlink 731 }; 753 }; 732 754 733 755 734 /* ******************************************* 756 /* ******************************************************** 735 * FS instance operations 757 * FS instance operations 736 */ 758 */ 737 759 738 760 739 /** Simulate the access to a node located on d 761 /** Simulate the access to a node located on disk. In virtfs, the 740 "disk" is directly the kernel memory, so t 762 "disk" is directly the kernel memory, so the 741 "sos_fs_node::storage_location field corre 763 "sos_fs_node::storage_location field corresponds to a kernel 742 address */ 764 address */ 743 static sos_ret_t 765 static sos_ret_t 744 virtfs_fetch_node_from_disk(struct sos_fs_mana 766 virtfs_fetch_node_from_disk(struct sos_fs_manager_instance * this, 745 sos_ui64_t storage 767 sos_ui64_t storage_location, 746 struct sos_fs_node 768 struct sos_fs_node ** result) 747 { 769 { 748 /* The "disk" is simply the ram */ 770 /* The "disk" is simply the ram */ 749 struct virtfs_node * virtfsnode; 771 struct virtfs_node * virtfsnode; 750 772 751 virtfsnode = (struct virtfs_node *)((sos_vad 773 virtfsnode = (struct virtfs_node *)((sos_vaddr_t)storage_location); 752 *result = & virtfsnode->super; 774 *result = & virtfsnode->super; 753 775 754 return SOS_OK; 776 return SOS_OK; 755 } 777 } 756 778 757 779 758 static sos_ret_t 780 static sos_ret_t 759 virtfs_allocate_new_node(struct sos_fs_manager 781 virtfs_allocate_new_node(struct sos_fs_manager_instance * this, 760 sos_fs_node_type_t ty 782 sos_fs_node_type_t type, 761 const struct sos_proc 783 const struct sos_process * creator, 762 sos_ui32_t access_rig 784 sos_ui32_t access_rights, 763 sos_ui32_t flags, 785 sos_ui32_t flags, 764 struct sos_fs_node ** 786 struct sos_fs_node ** result) 765 { 787 { 766 struct virtfs_node * virtfsnode; 788 struct virtfs_node * virtfsnode; 767 789 768 /* Allow only DIRs or FILEs */ !! 790 /* Allow only DIRs, FILEs or special device files */ 769 if ((type != SOS_FS_NODE_REGULAR_FILE) 791 if ((type != SOS_FS_NODE_REGULAR_FILE) 770 && (type != SOS_FS_NODE_SYMLINK) 792 && (type != SOS_FS_NODE_SYMLINK) 771 && (type != SOS_FS_NODE_DIRECTORY)) !! 793 && (type != SOS_FS_NODE_DIRECTORY) >> 794 && (type != SOS_FS_NODE_DEVICE_CHAR)) 772 return -SOS_ENOSUP; 795 return -SOS_ENOSUP; 773 796 774 virtfsnode = (struct virtfs_node*) sos_kmall 797 virtfsnode = (struct virtfs_node*) sos_kmalloc(sizeof(*virtfsnode), 0); 775 if (! virtfsnode) 798 if (! virtfsnode) 776 return -SOS_ENOMEM; 799 return -SOS_ENOMEM; 777 800 778 memset(virtfsnode, 0x0, sizeof(*virtfsnode)) 801 memset(virtfsnode, 0x0, sizeof(*virtfsnode)); 779 *result = & virtfsnode->super; 802 *result = & virtfsnode->super; 780 803 781 /* Initialize "file" */ 804 /* Initialize "file" */ 782 (*result)->inmem_ref_cnt = 1; 805 (*result)->inmem_ref_cnt = 1; 783 (*result)->custom_data = virtfsnode; 806 (*result)->custom_data = virtfsnode; 784 (*result)->storage_location = (sos_ui64_t)( 807 (*result)->storage_location = (sos_ui64_t)((sos_vaddr_t)virtfsnode); 785 (*result)->type = type; 808 (*result)->type = type; 786 (*result)->access_rights = access_rights 809 (*result)->access_rights = access_rights; 787 (*result)->destructor = virtfs_node_d 810 (*result)->destructor = virtfs_node_destructor; 788 (*result)->new_opened_file = virtfs_new_op << 789 (*result)->close_opened_file = virtfs_close_ << 790 (*result)->ops_file = & virtfs_ops_ 811 (*result)->ops_file = & virtfs_ops_file; >> 812 >> 813 /* The "file" functions are defined by the FS code only for >> 814 non-special device files */ >> 815 if (type != SOS_FS_NODE_DEVICE_CHAR) >> 816 { >> 817 (*result)->sync = virtfs_sync_node; >> 818 (*result)->new_opened_file = virtfs_new_opened_file; >> 819 (*result)->close_opened_file = virtfs_close_opened_file; >> 820 } >> 821 791 if (type == SOS_FS_NODE_SYMLINK) 822 if (type == SOS_FS_NODE_SYMLINK) 792 (*result)->ops_symlink = & virtfs_ops_syml 823 (*result)->ops_symlink = & virtfs_ops_symlink; 793 else if (type == SOS_FS_NODE_DIRECTORY) 824 else if (type == SOS_FS_NODE_DIRECTORY) 794 (*result)->ops_dir = & virtfs_ops_dir; 825 (*result)->ops_dir = & virtfs_ops_dir; 795 826 796 /* Initialize mapping structure */ 827 /* Initialize mapping structure */ 797 if (type == SOS_FS_NODE_REGULAR_FILE) 828 if (type == SOS_FS_NODE_REGULAR_FILE) 798 { 829 { 799 virtfsnode->file.mapres.allowed_access_r 830 virtfsnode->file.mapres.allowed_access_rights 800 = SOS_VM_MAP_PROT_READ 831 = SOS_VM_MAP_PROT_READ 801 | SOS_VM_MAP_PROT_WRITE 832 | SOS_VM_MAP_PROT_WRITE 802 | SOS_VM_MAP_PROT_EXEC; 833 | SOS_VM_MAP_PROT_EXEC; 803 virtfsnode->file.mapres.custom_data = 834 virtfsnode->file.mapres.custom_data = virtfsnode; 804 virtfsnode->file.mapres.mmap = 835 virtfsnode->file.mapres.mmap = virtfs_new_mapping; 805 } 836 } 806 837 807 list_add_tail(((struct virtfs_instance*)this 838 list_add_tail(((struct virtfs_instance*)this->custom_data)->list_fsnodes, 808 virtfsnode); 839 virtfsnode); 809 840 810 return SOS_OK; 841 return SOS_OK; 811 } 842 } 812 843 813 844 814 /* ******************************************* 845 /* ******************************************************** 815 * FS type (mount/umount) operations 846 * FS type (mount/umount) operations 816 */ 847 */ 817 848 818 static sos_ret_t virtfs_mount(struct sos_fs_ma 849 static sos_ret_t virtfs_mount(struct sos_fs_manager_type * this, 819 struct sos_fs_no 850 struct sos_fs_node * device, 820 const char * arg 851 const char * args, 821 struct sos_fs_ma 852 struct sos_fs_manager_instance ** mounted_fs) 822 { 853 { 823 sos_ret_t retval; 854 sos_ret_t retval; 824 struct virtfs_instance * fs; 855 struct virtfs_instance * fs; 825 struct sos_fs_node * fsnode_root; 856 struct sos_fs_node * fsnode_root; 826 struct sos_hash_table * hash; 857 struct sos_hash_table * hash; 827 858 828 *mounted_fs = (struct sos_fs_manager_instanc 859 *mounted_fs = (struct sos_fs_manager_instance*)NULL; 829 860 830 /* Create FS node hash table */ 861 /* Create FS node hash table */ 831 hash = sos_hash_create("virtfs H", struct so 862 hash = sos_hash_create("virtfs H", struct sos_fs_node, 832 sos_hash_ui64, 863 sos_hash_ui64, 833 sos_hash_key_eq_ui64, 864 sos_hash_key_eq_ui64, 17, 834 storage_location, hli 865 storage_location, hlink_nodecache); 835 if (! hash) 866 if (! hash) 836 return -SOS_ENOMEM; 867 return -SOS_ENOMEM; 837 868 838 fs = (struct virtfs_instance*) 869 fs = (struct virtfs_instance*) 839 sos_kmalloc(sizeof(struct virtfs_instance) 870 sos_kmalloc(sizeof(struct virtfs_instance), 0); 840 if (! fs) 871 if (! fs) 841 { 872 { 842 sos_hash_dispose(hash); 873 sos_hash_dispose(hash); 843 return -SOS_ENOMEM; 874 return -SOS_ENOMEM; 844 } 875 } 845 876 846 memset(fs, 0x0, sizeof(struct virtfs_instanc 877 memset(fs, 0x0, sizeof(struct virtfs_instance)); 847 retval = sos_kmutex_init(& fs->lock, "virtfs 878 retval = sos_kmutex_init(& fs->lock, "virtfs", SOS_KWQ_ORDER_FIFO); 848 if (SOS_OK != retval) 879 if (SOS_OK != retval) 849 { 880 { 850 sos_hash_dispose(hash); 881 sos_hash_dispose(hash); 851 sos_kfree((sos_vaddr_t) fs); 882 sos_kfree((sos_vaddr_t) fs); 852 return retval; 883 return retval; 853 } 884 } 854 fs->super.custom_data = fs; 885 fs->super.custom_data = fs; 855 fs->super.fs_type = this; 886 fs->super.fs_type = this; 856 fs->super.allocate_new_node = virtfs_allo 887 fs->super.allocate_new_node = virtfs_allocate_new_node; 857 fs->super.fetch_node_from_disk = virtfs_fetc 888 fs->super.fetch_node_from_disk = virtfs_fetch_node_from_disk; 858 fs->super.nodecache = hash; 889 fs->super.nodecache = hash; 859 890 860 retval = virtfs_allocate_new_node(& fs->supe 891 retval = virtfs_allocate_new_node(& fs->super, SOS_FS_NODE_DIRECTORY, 861 NULL, 892 NULL, 862 SOS_FS_REA 893 SOS_FS_READABLE | SOS_FS_WRITABLE 863 | SOS_FS_E 894 | SOS_FS_EXECUTABLE, 864 0, 895 0, 865 & fsnode_r 896 & fsnode_root); 866 if (SOS_OK != retval) 897 if (SOS_OK != retval) 867 { 898 { 868 sos_hash_dispose(hash); 899 sos_hash_dispose(hash); 869 sos_kmutex_dispose(& fs->lock); 900 sos_kmutex_dispose(& fs->lock); 870 sos_kfree((sos_vaddr_t) fs); 901 sos_kfree((sos_vaddr_t) fs); 871 return retval; 902 return retval; 872 } 903 } 873 904 874 retval = sos_fs_register_fs_instance(& fs->s 905 retval = sos_fs_register_fs_instance(& fs->super, fsnode_root); 875 sos_fs_unref_fsnode(fsnode_root); 906 sos_fs_unref_fsnode(fsnode_root); 876 if (SOS_OK != retval) 907 if (SOS_OK != retval) 877 { 908 { 878 sos_hash_dispose(hash); 909 sos_hash_dispose(hash); 879 sos_kmutex_dispose(& fs->lock); 910 sos_kmutex_dispose(& fs->lock); 880 sos_kfree((sos_vaddr_t) fs); 911 sos_kfree((sos_vaddr_t) fs); 881 return retval; 912 return retval; 882 } 913 } 883 914 884 *mounted_fs = & fs->super; 915 *mounted_fs = & fs->super; 885 return SOS_OK; 916 return SOS_OK; 886 } 917 } 887 918 888 919 889 static sos_ret_t virtfs_umount(struct sos_fs_m 920 static sos_ret_t virtfs_umount(struct sos_fs_manager_type * this, 890 struct sos_fs_m 921 struct sos_fs_manager_instance * mounted_fs) 891 { 922 { 892 struct virtfs_instance * virtfs = (struct vi 923 struct virtfs_instance * virtfs = (struct virtfs_instance*)mounted_fs->custom_data; 893 924 894 sos_hash_dispose(virtfs->super.nodecache); 925 sos_hash_dispose(virtfs->super.nodecache); 895 while (! list_is_empty(virtfs->list_fsnodes) 926 while (! list_is_empty(virtfs->list_fsnodes)) 896 { 927 { 897 struct virtfs_node * virtfsnode = list_p 928 struct virtfs_node * virtfsnode = list_pop_head(virtfs->list_fsnodes); 898 929 899 if (virtfsnode->super.type == SOS_FS_NOD 930 if (virtfsnode->super.type == SOS_FS_NODE_REGULAR_FILE) 900 { 931 { 901 if (virtfsnode->file.size > 0) 932 if (virtfsnode->file.size > 0) 902 sos_kfree((sos_vaddr_t) virtfsnode 933 sos_kfree((sos_vaddr_t) virtfsnode->file.data); 903 } 934 } 904 else if (virtfsnode->super.type == SOS_F 935 else if (virtfsnode->super.type == SOS_FS_NODE_DIRECTORY) 905 { 936 { 906 while (! list_is_empty_named(virtfsn 937 while (! list_is_empty_named(virtfsnode->dir.list_entries, 907 sibling 938 sibling_prev, sibling_next)) 908 { 939 { 909 struct virtfs_direntry * direntr 940 struct virtfs_direntry * direntry 910 = list_pop_head_named(virtfsno 941 = list_pop_head_named(virtfsnode->dir.list_entries, 911 sibling_ 942 sibling_prev, sibling_next); 912 943 913 sos_kfree((sos_vaddr_t)direntry- 944 sos_kfree((sos_vaddr_t)direntry->name); 914 sos_kfree((sos_vaddr_t)direntry) 945 sos_kfree((sos_vaddr_t)direntry); 915 } 946 } 916 } 947 } 917 948 918 sos_kfree((sos_vaddr_t)virtfsnode); 949 sos_kfree((sos_vaddr_t)virtfsnode); 919 } 950 } 920 951 921 sos_fs_unregister_fs_instance(& virtfs->supe 952 sos_fs_unregister_fs_instance(& virtfs->super); 922 sos_kmutex_dispose(& virtfs->lock); 953 sos_kmutex_dispose(& virtfs->lock); 923 sos_kfree((sos_vaddr_t)virtfs); 954 sos_kfree((sos_vaddr_t)virtfs); 924 return SOS_OK; 955 return SOS_OK; 925 } 956 } 926 957 927 958 928 /* ******************************************* 959 /* ******************************************************** 929 * File mapping stuff 960 * File mapping stuff 930 */ 961 */ 931 inline static struct virtfs_node * 962 inline static struct virtfs_node * 932 get_virtfsnode_of_vr(struct sos_umem_vmm_vr * 963 get_virtfsnode_of_vr(struct sos_umem_vmm_vr * vr) 933 { 964 { 934 struct sos_umem_vmm_mapped_resource *mr 965 struct sos_umem_vmm_mapped_resource *mr 935 = sos_umem_vmm_get_mapped_resource_of_vr(v 966 = sos_umem_vmm_get_mapped_resource_of_vr(vr); 936 967 937 return (struct virtfs_node *)mr->custom_data 968 return (struct virtfs_node *)mr->custom_data; 938 } 969 } 939 970 940 971 941 static void virtfs_map_ref(struct sos_umem_vmm 972 static void virtfs_map_ref(struct sos_umem_vmm_vr * vr) 942 { 973 { 943 struct virtfs_node * virtfsnode = get_virtfs 974 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 944 sos_fs_ref_fsnode(& virtfsnode->super); 975 sos_fs_ref_fsnode(& virtfsnode->super); 945 virtfsnode->file.num_mappings ++; 976 virtfsnode->file.num_mappings ++; 946 } 977 } 947 978 948 979 949 static void virtfs_map_unref(struct sos_umem_v 980 static void virtfs_map_unref(struct sos_umem_vmm_vr * vr) 950 { 981 { 951 struct virtfs_node * virtfsnode = get_virtfs 982 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 952 983 953 SOS_ASSERT_FATAL(virtfsnode->file.num_mappin 984 SOS_ASSERT_FATAL(virtfsnode->file.num_mappings > 0); 954 virtfsnode->file.num_mappings --; 985 virtfsnode->file.num_mappings --; 955 986 956 _sos_fs_unref_fsnode(& virtfsnode->super); 987 _sos_fs_unref_fsnode(& virtfsnode->super); 957 } 988 } 958 989 959 990 960 static sos_ret_t virtfs_map_page_in(struct sos 991 static sos_ret_t virtfs_map_page_in(struct sos_umem_vmm_vr * vr, 961 sos_uaddr_ 992 sos_uaddr_t uaddr, 962 sos_bool_t 993 sos_bool_t write_access) 963 { 994 { 964 struct virtfs_node * virtfsnode = get_virtfs 995 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 965 sos_luoffset_t offset = uaddr - sos_umem_vmm 996 sos_luoffset_t offset = uaddr - sos_umem_vmm_get_start_of_vr(vr); 966 sos_ret_t retval = SOS_OK; 997 sos_ret_t retval = SOS_OK; 967 sos_paddr_t ppage_paddr; 998 sos_paddr_t ppage_paddr; 968 999 969 /* The region is not allowed to be resized * 1000 /* The region is not allowed to be resized */ 970 if (SOS_PAGE_ALIGN_SUP(offset) > virtfsnode- 1001 if (SOS_PAGE_ALIGN_SUP(offset) > virtfsnode->file.size) 971 return -SOS_EFAULT; 1002 return -SOS_EFAULT; 972 1003 973 /* Lookup physical kernel page */ 1004 /* Lookup physical kernel page */ 974 ppage_paddr = sos_paging_get_paddr(SOS_PAGE_ 1005 ppage_paddr = sos_paging_get_paddr(SOS_PAGE_ALIGN_INF(virtfsnode->file.data 975 1006 + offset)); 976 1007 977 /* Cannot access unmapped kernel pages */ 1008 /* Cannot access unmapped kernel pages */ 978 if (! ppage_paddr) 1009 if (! ppage_paddr) 979 return -SOS_EFAULT; 1010 return -SOS_EFAULT; 980 1011 981 /* Remap it in user space */ 1012 /* Remap it in user space */ 982 retval = sos_paging_map(ppage_paddr, 1013 retval = sos_paging_map(ppage_paddr, 983 SOS_PAGE_ALIGN_INF(u 1014 SOS_PAGE_ALIGN_INF(uaddr), 984 TRUE, 1015 TRUE, 985 sos_umem_vmm_get_pro 1016 sos_umem_vmm_get_prot_of_vr(vr)); 986 1017 987 return retval; 1018 return retval; 988 } 1019 } 989 1020 990 1021 991 static struct sos_umem_vmm_vr_ops virtfs_map_o 1022 static struct sos_umem_vmm_vr_ops virtfs_map_ops 992 = (struct sos_umem_vmm_vr_ops){ 1023 = (struct sos_umem_vmm_vr_ops){ 993 .ref = virtfs_map_ref, 1024 .ref = virtfs_map_ref, 994 .unref = virtfs_map_unref, 1025 .unref = virtfs_map_unref, 995 .page_in = virtfs_map_page_in 1026 .page_in = virtfs_map_page_in 996 }; 1027 }; 997 1028 998 static sos_ret_t virtfs_new_mapping(struct sos 1029 static sos_ret_t virtfs_new_mapping(struct sos_umem_vmm_vr *vr) 999 { 1030 { 1000 struct virtfs_node * virtfsnode = get_virtf 1031 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 1001 sos_size_t reqsize; 1032 sos_size_t reqsize; 1002 sos_ret_t retval; 1033 sos_ret_t retval; 1003 1034 1004 reqsize = sos_umem_vmm_get_offset_in_resou 1035 reqsize = sos_umem_vmm_get_offset_in_resource(vr); 1005 reqsize += sos_umem_vmm_get_size_of_vr(vr); 1036 reqsize += sos_umem_vmm_get_size_of_vr(vr); 1006 1037 1007 /* Resize the region NOW */ 1038 /* Resize the region NOW */ 1008 if (reqsize > virtfsnode->file.size) 1039 if (reqsize > virtfsnode->file.size) 1009 { 1040 { 1010 retval = virtfs_resize(virtfsnode, 1041 retval = virtfs_resize(virtfsnode, 1011 SOS_PAGE_ALIGN_S 1042 SOS_PAGE_ALIGN_SUP(reqsize)); 1012 if (SOS_OK != retval) 1043 if (SOS_OK != retval) 1013 return retval; 1044 return retval; 1014 } 1045 } 1015 1046 1016 return sos_umem_vmm_set_ops_of_vr(vr, &virt 1047 return sos_umem_vmm_set_ops_of_vr(vr, &virtfs_map_ops); 1017 } 1048 }
| [ source navigation ] | [ diff markup ] | [ identifier search ] | [ general search ] |