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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 this woould !! 101 woould cause the underlying data area 102 data area t !! 102 to be moved */ 103 the impleme << 104 allocation << 105 is resized) << 106 } file; 103 } file; 107 104 108 /* A directory */ 105 /* A directory */ 109 struct 106 struct 110 { 107 { 111 /** the children nodes are inserted in F 108 /** the children nodes are inserted in FIFO order. This is 112 important for the readdir function t 109 important for the readdir function to be resilient against 113 mkdir/rmdir/creat/unlink */ 110 mkdir/rmdir/creat/unlink */ 114 struct virtfs_direntry * list_entries; 111 struct virtfs_direntry * list_entries; 115 112 116 /** Used by readdir to remember the last 113 /** Used by readdir to remember the last unique "creation order" 117 attributed */ 114 attributed */ 118 sos_lcount_t top_creation_order; 115 sos_lcount_t top_creation_order; 119 } dir; 116 } dir; 120 }; /* Anonymous union (gcc extension) */ 117 }; /* Anonymous union (gcc extension) */ 121 118 122 /* The virtfs nodes are chained */ 119 /* The virtfs nodes are chained */ 123 struct virtfs_node * prev, * next; 120 struct virtfs_node * prev, * next; 124 }; 121 }; 125 122 126 123 127 /** 124 /** 128 * A virtfs FS instance 125 * A virtfs FS instance 129 * 126 * 130 * Structural inheritance of sos_fs_manager_in 127 * Structural inheritance of sos_fs_manager_instance: "super" is the 131 * ancestor (in "OOP" terms). The "super" fiel 128 * ancestor (in "OOP" terms). The "super" field might not be the first 132 * field: from a sos_fs_manager_instance, the 129 * field: from a sos_fs_manager_instance, the corresponding 133 * virtfs_instance is given by the 130 * virtfs_instance is given by the 134 * sos_fs_manager_instance::custom_data field 131 * sos_fs_manager_instance::custom_data field 135 */ 132 */ 136 struct virtfs_instance 133 struct virtfs_instance 137 { 134 { 138 /** Ancestor */ 135 /** Ancestor */ 139 struct sos_fs_manager_instance super; 136 struct sos_fs_manager_instance super; 140 137 141 /** For the serialization of virtfs "disk" ( 138 /** For the serialization of virtfs "disk" (ie kernel memory) 142 accesses */ 139 accesses */ 143 struct sos_kmutex lock; 140 struct sos_kmutex lock; 144 141 145 /** The list of virtfs nodes "on disk" (ie i 142 /** The list of virtfs nodes "on disk" (ie in kernel memory) */ 146 struct virtfs_node * list_fsnodes; 143 struct virtfs_node * list_fsnodes; 147 }; 144 }; 148 145 149 146 150 /** The description of the "Virtual FS" */ 147 /** The description of the "Virtual FS" */ 151 static struct sos_fs_manager_type virtfs_type; 148 static struct sos_fs_manager_type virtfs_type; 152 149 153 150 154 /* ********** Forward declarations */ 151 /* ********** Forward declarations */ 155 static sos_ret_t virtfs_mount(struct sos_fs_ma 152 static sos_ret_t virtfs_mount(struct sos_fs_manager_type * this, 156 struct sos_fs_no 153 struct sos_fs_node * device, 157 const char * arg 154 const char * args, 158 struct sos_fs_ma 155 struct sos_fs_manager_instance ** mounted_fs); 159 156 160 157 161 static sos_ret_t virtfs_umount(struct sos_fs_m 158 static sos_ret_t virtfs_umount(struct sos_fs_manager_type * this, 162 struct sos_fs_m 159 struct sos_fs_manager_instance * mounted_fs); 163 160 164 161 165 static sos_ret_t virtfs_new_mapping(struct sos 162 static sos_ret_t virtfs_new_mapping(struct sos_umem_vmm_vr *vr); 166 163 167 164 168 sos_ret_t sos_fs_virtfs_subsystem_setup() 165 sos_ret_t sos_fs_virtfs_subsystem_setup() 169 { 166 { 170 strzcpy(virtfs_type.name, "virtfs", SOS_FS_M 167 strzcpy(virtfs_type.name, "virtfs", SOS_FS_MANAGER_NAME_MAXLEN); 171 virtfs_type.mount = virtfs_mount; 168 virtfs_type.mount = virtfs_mount; 172 virtfs_type.umount = virtfs_umount; 169 virtfs_type.umount = virtfs_umount; 173 170 174 return sos_fs_register_fs_type(& virtfs_type 171 return sos_fs_register_fs_type(& virtfs_type); 175 } 172 } 176 173 177 174 178 /* ******************************************* 175 /* ******************************************************** 179 * Helper functions 176 * Helper functions 180 */ 177 */ 181 178 182 179 183 /* Helper function to serialize "disk" accesse 180 /* Helper function to serialize "disk" accesses */ 184 inline static void virtfs_lock(struct virtfs_n 181 inline static void virtfs_lock(struct virtfs_node *a_node) 185 { 182 { 186 struct virtfs_instance * fs = (struct virtfs 183 struct virtfs_instance * fs = (struct virtfs_instance*)a_node->super.fs->custom_data; 187 sos_kmutex_lock(& fs->lock, NULL); 184 sos_kmutex_lock(& fs->lock, NULL); 188 } 185 } 189 186 190 187 191 /* Helper function to serialize "disk" accesse 188 /* Helper function to serialize "disk" accesses */ 192 inline static void virtfs_unlock(struct virtfs 189 inline static void virtfs_unlock(struct virtfs_node *a_node) 193 { 190 { 194 struct virtfs_instance * fs = (struct virtfs 191 struct virtfs_instance * fs = (struct virtfs_instance*)a_node->super.fs->custom_data; 195 sos_kmutex_unlock(& fs->lock); 192 sos_kmutex_unlock(& fs->lock); 196 } 193 } 197 194 198 195 199 /* Helper function to resize the given virts n 196 /* Helper function to resize the given virts node (ie kernel memory 200 reallocation) */ 197 reallocation) */ 201 static sos_ret_t virtfs_resize(struct virtfs_n 198 static sos_ret_t virtfs_resize(struct virtfs_node *this, 202 sos_size_t new_ 199 sos_size_t new_size) 203 { 200 { 204 void * new_data = NULL; 201 void * new_data = NULL; 205 202 206 if (this->file.size == new_size) 203 if (this->file.size == new_size) 207 return SOS_OK; 204 return SOS_OK; 208 205 209 /* Don't allow to resize the region when the 206 /* Don't allow to resize the region when the file is being mapped */ 210 if (this->file.num_mappings > 0) 207 if (this->file.num_mappings > 0) 211 return -SOS_EBUSY; 208 return -SOS_EBUSY; 212 209 213 if (new_size > 0) 210 if (new_size > 0) 214 { 211 { 215 /* Use kmem_vmm_alloc instead of kmalloc 212 /* Use kmem_vmm_alloc instead of kmalloc to make sure the data 216 WILL be page-aligned (needed by file 213 WILL be page-aligned (needed by file mapping stuff) */ 217 sos_ui32_t npages = SOS_PAGE_ALIGN_SUP(n 214 sos_ui32_t npages = SOS_PAGE_ALIGN_SUP(new_size) / SOS_PAGE_SIZE; 218 new_data = (void*)sos_kmem_vmm_alloc(npa 215 new_data = (void*)sos_kmem_vmm_alloc(npages, 219 SOS 216 SOS_KMEM_VMM_MAP); 220 if (! new_data) 217 if (! new_data) 221 return -SOS_OK; 218 return -SOS_OK; 222 } 219 } 223 220 224 /* Copy the data to its new location */ 221 /* Copy the data to its new location */ 225 if (this->file.size < new_size) 222 if (this->file.size < new_size) 226 { 223 { 227 if (this->file.size > 0) 224 if (this->file.size > 0) 228 memcpy(new_data, this->file.data, this 225 memcpy(new_data, this->file.data, this->file.size); 229 if (new_size > this->file.size) 226 if (new_size > this->file.size) 230 memset(new_data + this->file.size, 0x0 227 memset(new_data + this->file.size, 0x0, 231 new_size - this->file.size); 228 new_size - this->file.size); 232 } 229 } 233 else if (new_size > 0) 230 else if (new_size > 0) 234 memcpy(new_data, this->file.data, new_size 231 memcpy(new_data, this->file.data, new_size); 235 232 236 if (this->file.data) 233 if (this->file.data) 237 sos_kfree((sos_vaddr_t)this->file.data); 234 sos_kfree((sos_vaddr_t)this->file.data); 238 this->file.data = new_data; 235 this->file.data = new_data; 239 this->file.size = new_size; 236 this->file.size = new_size; 240 237 241 return SOS_OK; 238 return SOS_OK; 242 } 239 } 243 240 244 241 245 /* ******************************************* 242 /* ******************************************************** 246 * Opened file operations 243 * Opened file operations 247 */ 244 */ 248 245 249 246 250 static sos_ret_t 247 static sos_ret_t 251 virtfs_duplicate_opened_file(struct sos_fs_ope 248 virtfs_duplicate_opened_file(struct sos_fs_opened_file *this, 252 const struct sos_ 249 const struct sos_process * for_owner, 253 struct sos_fs_ope 250 struct sos_fs_opened_file **result) 254 { 251 { 255 *result = (struct sos_fs_opened_file*) 252 *result = (struct sos_fs_opened_file*) 256 sos_kmalloc(sizeof(struct sos_fs_opened_fi 253 sos_kmalloc(sizeof(struct sos_fs_opened_file), 0); 257 if (! *result) 254 if (! *result) 258 return -SOS_ENOMEM; 255 return -SOS_ENOMEM; 259 256 260 memcpy(*result, this, sizeof(*this)); 257 memcpy(*result, this, sizeof(*this)); 261 (*result)->owner = for_owner; 258 (*result)->owner = for_owner; 262 return SOS_OK; 259 return SOS_OK; 263 } 260 } 264 261 265 262 266 static sos_ret_t 263 static sos_ret_t 267 virtfs_seek(struct sos_fs_opened_file *this, 264 virtfs_seek(struct sos_fs_opened_file *this, 268 sos_lsoffset_t offset, 265 sos_lsoffset_t offset, 269 sos_seek_whence_t whence, 266 sos_seek_whence_t whence, 270 /* out */ sos_lsoffset_t * result_ 267 /* out */ sos_lsoffset_t * result_position) 271 { 268 { 272 sos_lsoffset_t ref_offs; 269 sos_lsoffset_t ref_offs; 273 struct virtfs_node * virtfsnode; 270 struct virtfs_node * virtfsnode; 274 271 275 virtfsnode = (struct virtfs_node*) 272 virtfsnode = (struct virtfs_node*) 276 sos_fs_nscache_get_fs_node(this->direntry) 273 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 277 274 278 if ( (virtfsnode->super.type != SOS_FS_NODE_ 275 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 279 && (virtfsnode->super.type != SOS_FS_NO 276 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 280 return -SOS_ENOSUP; 277 return -SOS_ENOSUP; 281 278 282 *result_position = this->position; 279 *result_position = this->position; 283 switch (whence) 280 switch (whence) 284 { 281 { 285 case SOS_SEEK_SET: 282 case SOS_SEEK_SET: 286 ref_offs = 0; 283 ref_offs = 0; 287 break; 284 break; 288 285 289 case SOS_SEEK_CUR: 286 case SOS_SEEK_CUR: 290 ref_offs = this->position; 287 ref_offs = this->position; 291 break; 288 break; 292 289 293 case SOS_SEEK_END: 290 case SOS_SEEK_END: 294 ref_offs = virtfsnode->file.size; 291 ref_offs = virtfsnode->file.size; 295 break; 292 break; 296 293 297 default: 294 default: 298 return -SOS_EINVAL; 295 return -SOS_EINVAL; 299 } 296 } 300 297 301 if (offset < -ref_offs) 298 if (offset < -ref_offs) 302 return -SOS_EINVAL; 299 return -SOS_EINVAL; 303 300 304 this->position = ref_offs + offset; 301 this->position = ref_offs + offset; 305 *result_position = this->position; 302 *result_position = this->position; 306 return SOS_OK; 303 return SOS_OK; 307 } 304 } 308 305 309 306 310 static sos_ret_t virtfs_read(struct sos_fs_ope 307 static sos_ret_t virtfs_read(struct sos_fs_opened_file *this, 311 sos_uaddr_t dest_ 308 sos_uaddr_t dest_buf, 312 sos_size_t * /* i 309 sos_size_t * /* in/out */len) 313 { 310 { 314 sos_ret_t retval; 311 sos_ret_t retval; 315 struct virtfs_node * virtfsnode; 312 struct virtfs_node * virtfsnode; 316 313 317 virtfsnode = (struct virtfs_node*) 314 virtfsnode = (struct virtfs_node*) 318 sos_fs_nscache_get_fs_node(this->direntry) 315 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 319 316 320 if ( (virtfsnode->super.type != SOS_FS_NODE_ 317 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 321 && (virtfsnode->super.type != SOS_FS_NO 318 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 322 return -SOS_ENOSUP; 319 return -SOS_ENOSUP; 323 320 324 if (this->position >= virtfsnode->file.size) 321 if (this->position >= virtfsnode->file.size) 325 { 322 { 326 *len = 0; 323 *len = 0; 327 return SOS_OK; 324 return SOS_OK; 328 } 325 } 329 326 330 virtfs_lock(virtfsnode); 327 virtfs_lock(virtfsnode); 331 328 332 if (this->position + *len >= virtfsnode->fil 329 if (this->position + *len >= virtfsnode->file.size) 333 *len = virtfsnode->file.size - this->posit 330 *len = virtfsnode->file.size - this->position; 334 331 335 retval = sos_memcpy_to_user(dest_buf, 332 retval = sos_memcpy_to_user(dest_buf, 336 ((sos_vaddr_t)vi 333 ((sos_vaddr_t)virtfsnode->file.data) 337 + this->position 334 + this->position, 338 *len); 335 *len); 339 if (retval < 0) 336 if (retval < 0) 340 { 337 { 341 virtfs_unlock(virtfsnode); 338 virtfs_unlock(virtfsnode); 342 return retval; 339 return retval; 343 } 340 } 344 341 345 this->position += retval; 342 this->position += retval; 346 *len = retval; 343 *len = retval; 347 344 348 virtfs_unlock(virtfsnode); 345 virtfs_unlock(virtfsnode); 349 346 350 return SOS_OK; 347 return SOS_OK; 351 } 348 } 352 349 353 350 354 static sos_ret_t virtfs_write(struct sos_fs_op 351 static sos_ret_t virtfs_write(struct sos_fs_opened_file *this, 355 sos_uaddr_t src_b 352 sos_uaddr_t src_buf, 356 sos_size_t * /* i 353 sos_size_t * /* in/out */len) 357 { 354 { 358 sos_ret_t retval; 355 sos_ret_t retval; 359 struct virtfs_node * virtfsnode; 356 struct virtfs_node * virtfsnode; 360 357 361 virtfsnode = (struct virtfs_node*) 358 virtfsnode = (struct virtfs_node*) 362 sos_fs_nscache_get_fs_node(this->direntry) 359 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 363 360 364 if ( (virtfsnode->super.type != SOS_FS_NODE_ 361 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 365 && (virtfsnode->super.type != SOS_FS_NO 362 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 366 return -SOS_ENOSUP; 363 return -SOS_ENOSUP; 367 364 368 virtfs_lock(virtfsnode); 365 virtfs_lock(virtfsnode); 369 if (this->position + *len >= virtfsnode->fil 366 if (this->position + *len >= virtfsnode->file.size) 370 { 367 { 371 /* Try to resize if needed */ 368 /* Try to resize if needed */ 372 if (SOS_OK != virtfs_resize(virtfsnode, 369 if (SOS_OK != virtfs_resize(virtfsnode, this->position + *len)) 373 *len = virtfsnode->file.size - this->p 370 *len = virtfsnode->file.size - this->position; 374 } 371 } 375 372 376 retval = sos_memcpy_from_user(((sos_vaddr_t) 373 retval = sos_memcpy_from_user(((sos_vaddr_t)virtfsnode->file.data) 377 + this->posi 374 + this->position, 378 src_buf, 375 src_buf, 379 *len); 376 *len); 380 if (retval < 0) 377 if (retval < 0) 381 { 378 { 382 virtfs_unlock(virtfsnode); 379 virtfs_unlock(virtfsnode); 383 return retval; 380 return retval; 384 } 381 } 385 382 386 this->position += retval; 383 this->position += retval; 387 *len = retval; 384 *len = retval; 388 385 389 virtfs_unlock(virtfsnode); 386 virtfs_unlock(virtfsnode); 390 387 391 return SOS_OK; 388 return SOS_OK; 392 } 389 } 393 390 394 391 395 static sos_ret_t virtfs_mmap(struct sos_fs_ope 392 static sos_ret_t virtfs_mmap(struct sos_fs_opened_file *this, 396 sos_uaddr_t *uadd 393 sos_uaddr_t *uaddr, sos_size_t size, 397 sos_ui32_t access 394 sos_ui32_t access_rights, 398 sos_ui32_t flags, 395 sos_ui32_t flags, 399 sos_luoffset_t of 396 sos_luoffset_t offset) 400 { 397 { 401 struct virtfs_node * virtfsnode; 398 struct virtfs_node * virtfsnode; 402 399 403 virtfsnode = (struct virtfs_node*) 400 virtfsnode = (struct virtfs_node*) 404 sos_fs_nscache_get_fs_node(this->direntry) 401 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 405 402 406 if (virtfsnode->super.type != SOS_FS_NODE_RE 403 if (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 407 return -SOS_ENOSUP; 404 return -SOS_ENOSUP; 408 405 409 return sos_umem_vmm_map(sos_process_get_addr 406 return sos_umem_vmm_map(sos_process_get_address_space(this->owner), 410 uaddr, size, access_ 407 uaddr, size, access_rights, 411 flags, & virtfsnode- 408 flags, & virtfsnode->file.mapres, offset); 412 } 409 } 413 410 414 411 415 static sos_ret_t virtfs_readdir(struct sos_fs_ 412 static sos_ret_t virtfs_readdir(struct sos_fs_opened_file *this, 416 struct sos_fs_ 413 struct sos_fs_dirent * result) 417 { 414 { 418 /* For directories, "position" indicates the 415 /* For directories, "position" indicates the "creation_order" of the 419 last readdir operation, and "custom_data" 416 last readdir operation, and "custom_data" indicates the address 420 of the last directory entry */ 417 of the last directory entry */ 421 418 422 struct virtfs_direntry * direntry, * next_di 419 struct virtfs_direntry * direntry, * next_direntry; 423 struct virtfs_node * virtfsnode; 420 struct virtfs_node * virtfsnode; 424 int nb; 421 int nb; 425 422 426 virtfsnode = (struct virtfs_node*) 423 virtfsnode = (struct virtfs_node*) 427 sos_fs_nscache_get_fs_node(this->direntry) 424 sos_fs_nscache_get_fs_node(this->direntry)->custom_data; 428 next_direntry = NULL; 425 next_direntry = NULL; 429 426 430 /* If the "generation" of the node did not c 427 /* If the "generation" of the node did not change, the next direntry 431 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 432 of direntries is sorted in increasing cre 429 of direntries is sorted in increasing creation_order. */ 433 if ((this->generation == virtfsnode->super.g 430 if ((this->generation == virtfsnode->super.generation) 434 && (this->custom_data != NULL)) 431 && (this->custom_data != NULL)) 435 { 432 { 436 direntry = (struct virtfs_direntry*)this 433 direntry = (struct virtfs_direntry*)this->custom_data; 437 next_direntry = direntry->sibling_next; 434 next_direntry = direntry->sibling_next; 438 435 439 /* Did we go past the end of the list ? 436 /* Did we go past the end of the list ? */ 440 if (next_direntry == list_get_head_named 437 if (next_direntry == list_get_head_named(virtfsnode->dir.list_entries, 441 438 sibling_prev, sibling_next)) 442 next_direntry = NULL; 439 next_direntry = NULL; 443 } 440 } 444 else 441 else 445 /* Otherwise we have to lookup the next en 442 /* Otherwise we have to lookup the next entry manually */ 446 { 443 { 447 /* Lookup the entry that has next creati 444 /* Lookup the entry that has next creation_order */ 448 next_direntry = NULL; 445 next_direntry = NULL; 449 list_foreach_forward_named(virtfsnode->d 446 list_foreach_forward_named(virtfsnode->dir.list_entries, 450 direntry, nb, 447 direntry, nb, 451 sibling_prev, 448 sibling_prev, sibling_next) 452 { 449 { 453 if (direntry->creation_order <= this 450 if (direntry->creation_order <= this->position) 454 continue; 451 continue; 455 452 456 if (! next_direntry) 453 if (! next_direntry) 457 { 454 { 458 next_direntry = direntry; 455 next_direntry = direntry; 459 continue; 456 continue; 460 } 457 } 461 458 462 if (direntry->creation_order < next_ 459 if (direntry->creation_order < next_direntry->creation_order) 463 next_direntry = direntry; 460 next_direntry = direntry; 464 } 461 } 465 } 462 } 466 463 467 if (! next_direntry) 464 if (! next_direntry) 468 { 465 { 469 this->custom_data = NULL; 466 this->custom_data = NULL; 470 this->position = 0; 467 this->position = 0; 471 return -SOS_ENOENT; 468 return -SOS_ENOENT; 472 } 469 } 473 470 474 /* Update the result */ 471 /* Update the result */ 475 result->storage_location = ((sos_vaddr_t)ne 472 result->storage_location = ((sos_vaddr_t)next_direntry->fsnode); 476 result->offset_in_dirfile = next_direntry->c 473 result->offset_in_dirfile = next_direntry->creation_order; 477 result->type = next_direntry->f 474 result->type = next_direntry->fsnode->type; 478 result->namelen = strnlen(next_dir 475 result->namelen = strnlen(next_direntry->name, 479 SOS_FS_D 476 SOS_FS_DIRENT_NAME_MAXLEN); 480 strzcpy(result->name, next_direntry->name, S 477 strzcpy(result->name, next_direntry->name, SOS_FS_DIRENT_NAME_MAXLEN); 481 478 482 /* Update the custom data */ 479 /* Update the custom data */ 483 this->position = next_direntry->creation_ 480 this->position = next_direntry->creation_order; 484 this->custom_data = next_direntry; 481 this->custom_data = next_direntry; 485 482 486 return SOS_OK; 483 return SOS_OK; 487 } 484 } 488 485 489 486 490 static struct sos_fs_ops_opened_file virtfs_op 487 static struct sos_fs_ops_opened_file virtfs_ops_opened_file = 491 (struct sos_fs_ops_opened_file){ 488 (struct sos_fs_ops_opened_file){ 492 .seek = virtfs_seek, 489 .seek = virtfs_seek, 493 .read = virtfs_read, 490 .read = virtfs_read, 494 .write = virtfs_write, 491 .write = virtfs_write, 495 .mmap = virtfs_mmap 492 .mmap = virtfs_mmap 496 }; 493 }; 497 494 498 495 499 static struct sos_fs_ops_opened_dir virtfs_ops 496 static struct sos_fs_ops_opened_dir virtfs_ops_opened_dir = 500 (struct sos_fs_ops_opened_dir){ 497 (struct sos_fs_ops_opened_dir){ 501 .readdir = virtfs_readdir 498 .readdir = virtfs_readdir 502 }; 499 }; 503 500 504 501 505 /* ******************************************* 502 /* ******************************************************** 506 * FS node operations 503 * FS node operations 507 */ 504 */ 508 505 509 static sos_ret_t virtfs_stat_node(struct sos_f 506 static sos_ret_t virtfs_stat_node(struct sos_fs_node * this, 510 struct sos_f 507 struct sos_fs_stat * result) 511 { 508 { 512 struct virtfs_node * virtfsnode = (struct vi 509 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 513 510 514 /* Establish the major/minor fields */ 511 /* Establish the major/minor fields */ 515 result->st_rdev.device_class = 0; 512 result->st_rdev.device_class = 0; 516 result->st_rdev.device_instance = 0; 513 result->st_rdev.device_instance = 0; 517 if ( (this->type == SOS_FS_NODE_DEVICE_CHAR) !! 514 if (this->type == SOS_FS_NODE_DEVICE_CHAR) 518 || (this->type == SOS_FS_NODE_DEVICE_BL << 519 { 515 { 520 /* If the current node is a special devi 516 /* If the current node is a special device: get the major/minor 521 directly from it */ 517 directly from it */ 522 result->st_rdev.device_class = this-> 518 result->st_rdev.device_class = this->dev_id.device_class; 523 result->st_rdev.device_instance = this-> 519 result->st_rdev.device_instance = this->dev_id.device_instance; 524 } 520 } 525 else 521 else 526 { 522 { 527 /* Otherwise, retrieve it from the devic 523 /* Otherwise, retrieve it from the device that it is mounted 528 on (might not exist...) */ 524 on (might not exist...) */ 529 struct sos_fs_node * rootdev = this->fs- 525 struct sos_fs_node * rootdev = this->fs->device; 530 if (rootdev) 526 if (rootdev) 531 { 527 { 532 result->st_rdev.device_class = ro 528 result->st_rdev.device_class = rootdev->dev_id.device_class; 533 result->st_rdev.device_instance = ro 529 result->st_rdev.device_instance = rootdev->dev_id.device_instance; 534 } 530 } 535 } 531 } 536 532 537 result->st_type = this->type 533 result->st_type = this->type; 538 result->st_storage_location = this->stor 534 result->st_storage_location = this->storage_location; 539 result->st_access_rights = this->acce 535 result->st_access_rights = this->access_rights; 540 result->st_nlink = this->ondi 536 result->st_nlink = this->ondisk_lnk_cnt; 541 if (this->type == SOS_FS_NODE_REGULAR_FILE) 537 if (this->type == SOS_FS_NODE_REGULAR_FILE) 542 result->st_size = virtfsnode 538 result->st_size = virtfsnode->file.size; 543 else 539 else 544 result->st_size = 0; 540 result->st_size = 0; 545 return SOS_OK; 541 return SOS_OK; 546 } 542 } 547 543 548 544 549 static sos_ret_t virtfs_truncate(struct sos_fs 545 static sos_ret_t virtfs_truncate(struct sos_fs_node *this, 550 sos_lsoffset_ 546 sos_lsoffset_t length) 551 { 547 { 552 sos_ret_t retval; 548 sos_ret_t retval; 553 struct virtfs_node * virtfsnode; 549 struct virtfs_node * virtfsnode; 554 550 555 virtfsnode = (struct virtfs_node*) this->cus 551 virtfsnode = (struct virtfs_node*) this->custom_data; 556 552 557 if ( (virtfsnode->super.type != SOS_FS_NODE_ 553 if ( (virtfsnode->super.type != SOS_FS_NODE_REGULAR_FILE) 558 && (virtfsnode->super.type != SOS_FS_NO 554 && (virtfsnode->super.type != SOS_FS_NODE_SYMLINK)) 559 return -SOS_ENOSUP; 555 return -SOS_ENOSUP; 560 556 561 virtfs_lock(virtfsnode); 557 virtfs_lock(virtfsnode); 562 retval = virtfs_resize(virtfsnode, length); 558 retval = virtfs_resize(virtfsnode, length); 563 virtfs_unlock(virtfsnode); 559 virtfs_unlock(virtfsnode); 564 560 565 return retval; 561 return retval; 566 } 562 } 567 563 568 564 569 static sos_ret_t virtfs_sync_node(struct sos_f 565 static sos_ret_t virtfs_sync_node(struct sos_fs_node *this) 570 { 566 { 571 /* No backing store for virtfs */ 567 /* No backing store for virtfs */ 572 return SOS_OK; 568 return SOS_OK; 573 } 569 } 574 570 575 571 576 static sos_ret_t virtfs_chmod_node(struct sos_ 572 static sos_ret_t virtfs_chmod_node(struct sos_fs_node * this, 577 sos_ui32_t 573 sos_ui32_t access_rights) 578 { 574 { 579 this->access_rights = access_rights; 575 this->access_rights = access_rights; 580 return SOS_OK; 576 return SOS_OK; 581 } 577 } 582 578 583 579 584 /** Callback when nothing (in particular no so 580 /** Callback when nothing (in particular no sos_fs_nscache_node) make 585 reference to the node */ 581 reference to the node */ 586 static sos_ret_t virtfs_node_destructor(struct 582 static sos_ret_t virtfs_node_destructor(struct sos_fs_node * this) 587 { 583 { 588 /* This callback is called only when the fsn 584 /* This callback is called only when the fsnode is not needed 589 anymore by any process or by the kernel. 585 anymore by any process or by the kernel. But the node must remain 590 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 591 still "on disk" */ 587 still "on disk" */ 592 if (this->ondisk_lnk_cnt <= 0) 588 if (this->ondisk_lnk_cnt <= 0) 593 { 589 { 594 struct virtfs_instance * virtfs = (struc 590 struct virtfs_instance * virtfs = (struct virtfs_instance*)this->fs->custom_data; 595 struct virtfs_node * virtfsnode = (struc 591 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 596 592 597 list_delete(virtfs->list_fsnodes, virtfs 593 list_delete(virtfs->list_fsnodes, virtfsnode); 598 sos_kfree((sos_vaddr_t) this->custom_dat 594 sos_kfree((sos_vaddr_t) this->custom_data); 599 } 595 } 600 596 601 return SOS_OK; 597 return SOS_OK; 602 } 598 } 603 599 604 600 605 static struct sos_fs_node_ops_file virtfs_ops_ 601 static struct sos_fs_node_ops_file virtfs_ops_file = 606 (struct sos_fs_node_ops_file){ 602 (struct sos_fs_node_ops_file){ 607 .truncate = virtfs_truncate, 603 .truncate = virtfs_truncate, 608 .stat = virtfs_stat_node, 604 .stat = virtfs_stat_node, 609 .chmod = virtfs_chmod_node, !! 605 .chmod = virtfs_chmod_node 610 .sync = virtfs_sync_node << 611 }; 606 }; 612 607 613 608 614 static sos_ret_t virtfs_new_opened_file(struct 609 static sos_ret_t virtfs_new_opened_file(struct sos_fs_node * this, 615 const 610 const struct sos_process * owner, 616 sos_ui 611 sos_ui32_t open_flags, 617 struct 612 struct sos_fs_opened_file ** result_of) 618 { 613 { 619 struct sos_fs_opened_file * of 614 struct sos_fs_opened_file * of 620 = (struct sos_fs_opened_file*)sos_kmalloc( 615 = (struct sos_fs_opened_file*)sos_kmalloc(sizeof(*of), 0); 621 if (! of) 616 if (! of) 622 return -SOS_ENOMEM; 617 return -SOS_ENOMEM; 623 618 624 memset(of, 0x0, sizeof(*of)); 619 memset(of, 0x0, sizeof(*of)); 625 of->owner = owner; 620 of->owner = owner; 626 of->duplicate = virtfs_duplicate_opened_fil 621 of->duplicate = virtfs_duplicate_opened_file; 627 of->open_flags = open_flags; 622 of->open_flags = open_flags; 628 of->ops_file = & virtfs_ops_opened_file; 623 of->ops_file = & virtfs_ops_opened_file; 629 if (this->type == SOS_FS_NODE_DIRECTORY) 624 if (this->type == SOS_FS_NODE_DIRECTORY) 630 of->ops_dir = & virtfs_ops_opened_dir; 625 of->ops_dir = & virtfs_ops_opened_dir; 631 626 632 *result_of = of; 627 *result_of = of; 633 return SOS_OK; 628 return SOS_OK; 634 } 629 } 635 630 636 631 637 static sos_ret_t virtfs_close_opened_file(stru 632 static sos_ret_t virtfs_close_opened_file(struct sos_fs_node * this, 638 stru 633 struct sos_fs_opened_file * of) 639 { 634 { 640 sos_kfree((sos_vaddr_t)of); 635 sos_kfree((sos_vaddr_t)of); 641 return SOS_OK; 636 return SOS_OK; 642 } 637 } 643 638 644 639 645 static sos_ret_t virtfs_symlink_expand(struct 640 static sos_ret_t virtfs_symlink_expand(struct sos_fs_node *this, 646 char co 641 char const ** target, 647 sos_siz 642 sos_size_t * target_len) 648 { 643 { 649 struct virtfs_node * virtfsnode = (struct vi 644 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 650 645 651 *target = virtfsnode->file.data; 646 *target = virtfsnode->file.data; 652 *target_len = virtfsnode->file.size; 647 *target_len = virtfsnode->file.size; 653 648 654 return SOS_OK; 649 return SOS_OK; 655 } 650 } 656 651 657 652 658 static struct sos_fs_node_ops_symlink virtfs_o 653 static struct sos_fs_node_ops_symlink virtfs_ops_symlink 659 = (struct sos_fs_node_ops_symlink){ 654 = (struct sos_fs_node_ops_symlink){ 660 .expand = virtfs_symlink_expand 655 .expand = virtfs_symlink_expand 661 }; 656 }; 662 657 663 658 664 static sos_ret_t virtfs_dir_lookup(struct sos_ 659 static sos_ret_t virtfs_dir_lookup(struct sos_fs_node *this, 665 const char 660 const char * name, sos_ui16_t namelen, 666 sos_ui64_t 661 sos_ui64_t * result_storage_location) 667 { 662 { 668 struct virtfs_node * virtfsnode = (struct vi 663 struct virtfs_node * virtfsnode = (struct virtfs_node*)this->custom_data; 669 struct virtfs_direntry * direntry; 664 struct virtfs_direntry * direntry; 670 int nbentries; 665 int nbentries; 671 666 672 list_foreach_forward_named(virtfsnode->dir.l 667 list_foreach_forward_named(virtfsnode->dir.list_entries, 673 direntry, nbentri 668 direntry, nbentries, 674 sibling_prev, sib 669 sibling_prev, sibling_next) 675 { 670 { 676 if (!memcmp(name, direntry->name, namele 671 if (!memcmp(name, direntry->name, namelen) && !direntry->name[namelen]) 677 { 672 { 678 *result_storage_location = direntry- 673 *result_storage_location = direntry->fsnode->storage_location; 679 return SOS_OK; 674 return SOS_OK; 680 } 675 } 681 } 676 } 682 677 683 return -SOS_ENOENT; 678 return -SOS_ENOENT; 684 } 679 } 685 680 686 681 687 static sos_ret_t virtfs_link(struct sos_fs_nod 682 static sos_ret_t virtfs_link(struct sos_fs_node *this, 688 const struct sos_ 683 const struct sos_process *actor, 689 const char * entr 684 const char * entry_name, sos_ui16_t entry_namelen, 690 struct sos_fs_nod 685 struct sos_fs_node * node) 691 { 686 { 692 struct virtfs_node * parent = (struct virtfs 687 struct virtfs_node * parent = (struct virtfs_node*)this->custom_data; 693 struct virtfs_direntry * direntry; 688 struct virtfs_direntry * direntry; 694 689 695 direntry = (struct virtfs_direntry*)sos_kmal 690 direntry = (struct virtfs_direntry*)sos_kmalloc(sizeof(*direntry), 0); 696 if (! direntry) 691 if (! direntry) 697 return -SOS_ENOMEM; 692 return -SOS_ENOMEM; 698 693 699 direntry->name = (char*)sos_kmalloc(entry_na 694 direntry->name = (char*)sos_kmalloc(entry_namelen + 1, 0); 700 if (! direntry->name) 695 if (! direntry->name) 701 { 696 { 702 sos_kfree((sos_vaddr_t)direntry->name); 697 sos_kfree((sos_vaddr_t)direntry->name); 703 return -SOS_ENOMEM; 698 return -SOS_ENOMEM; 704 } 699 } 705 700 706 memcpy(direntry->name, entry_name, entry_nam 701 memcpy(direntry->name, entry_name, entry_namelen); 707 direntry->name[entry_namelen] = '\0'; 702 direntry->name[entry_namelen] = '\0'; 708 703 709 direntry->fsnode = node; 704 direntry->fsnode = node; 710 node->ondisk_lnk_cnt ++; 705 node->ondisk_lnk_cnt ++; 711 this->ondisk_lnk_cnt ++; 706 this->ondisk_lnk_cnt ++; 712 list_add_tail_named(parent->dir.list_entries 707 list_add_tail_named(parent->dir.list_entries, direntry, 713 sibling_prev, sibling_ne 708 sibling_prev, sibling_next); 714 709 715 /* Update the index of the new entry in orde 710 /* Update the index of the new entry in order for the next readdirs 716 to fetch this new entry */ 711 to fetch this new entry */ 717 parent->dir.top_creation_order ++; 712 parent->dir.top_creation_order ++; 718 direntry->creation_order = parent->dir.top_c 713 direntry->creation_order = parent->dir.top_creation_order; 719 714 720 return SOS_OK; 715 return SOS_OK; 721 } 716 } 722 717 723 718 724 static sos_ret_t 719 static sos_ret_t 725 virtfs_unlink(struct sos_fs_node *this, 720 virtfs_unlink(struct sos_fs_node *this, 726 const struct sos_process *actor, 721 const struct sos_process *actor, 727 const char * entry_name, sos_ui1 722 const char * entry_name, sos_ui16_t entry_namelen) 728 { 723 { 729 struct virtfs_node * parent = (struct virtfs 724 struct virtfs_node * parent = (struct virtfs_node*)this->custom_data; 730 struct virtfs_direntry * direntry; 725 struct virtfs_direntry * direntry; 731 int nbentries; 726 int nbentries; 732 727 733 list_foreach_forward_named(parent->dir.list_ 728 list_foreach_forward_named(parent->dir.list_entries, 734 direntry, nbentri 729 direntry, nbentries, 735 sibling_prev, sib 730 sibling_prev, sibling_next) 736 { 731 { 737 if (!memcmp(entry_name, direntry->name, 732 if (!memcmp(entry_name, direntry->name, entry_namelen) 738 && !direntry->name[entry_namelen]) 733 && !direntry->name[entry_namelen]) 739 { 734 { 740 list_delete_named(parent->dir.list_e 735 list_delete_named(parent->dir.list_entries, direntry, 741 sibling_prev, sibl 736 sibling_prev, sibling_next); 742 direntry->fsnode->ondisk_lnk_cnt --; 737 direntry->fsnode->ondisk_lnk_cnt --; 743 this->ondisk_lnk_cnt --; 738 this->ondisk_lnk_cnt --; 744 sos_kfree((sos_vaddr_t)direntry); 739 sos_kfree((sos_vaddr_t)direntry); 745 return SOS_OK; 740 return SOS_OK; 746 } 741 } 747 } 742 } 748 743 749 return -SOS_ENOENT; 744 return -SOS_ENOENT; 750 } 745 } 751 746 752 747 753 static struct sos_fs_node_ops_dir virtfs_ops_d 748 static struct sos_fs_node_ops_dir virtfs_ops_dir 754 = (struct sos_fs_node_ops_dir){ 749 = (struct sos_fs_node_ops_dir){ 755 .lookup = virtfs_dir_lookup, 750 .lookup = virtfs_dir_lookup, 756 .link = virtfs_link, 751 .link = virtfs_link, 757 .unlink = virtfs_unlink 752 .unlink = virtfs_unlink 758 }; 753 }; 759 754 760 755 761 /* ******************************************* 756 /* ******************************************************** 762 * FS instance operations 757 * FS instance operations 763 */ 758 */ 764 759 765 760 766 /** Simulate the access to a node located on d 761 /** Simulate the access to a node located on disk. In virtfs, the 767 "disk" is directly the kernel memory, so t 762 "disk" is directly the kernel memory, so the 768 "sos_fs_node::storage_location field corre 763 "sos_fs_node::storage_location field corresponds to a kernel 769 address */ 764 address */ 770 static sos_ret_t 765 static sos_ret_t 771 virtfs_fetch_node_from_disk(struct sos_fs_mana 766 virtfs_fetch_node_from_disk(struct sos_fs_manager_instance * this, 772 sos_ui64_t storage 767 sos_ui64_t storage_location, 773 struct sos_fs_node 768 struct sos_fs_node ** result) 774 { 769 { 775 /* The "disk" is simply the ram */ 770 /* The "disk" is simply the ram */ 776 struct virtfs_node * virtfsnode; 771 struct virtfs_node * virtfsnode; 777 772 778 virtfsnode = (struct virtfs_node *)((sos_vad 773 virtfsnode = (struct virtfs_node *)((sos_vaddr_t)storage_location); 779 *result = & virtfsnode->super; 774 *result = & virtfsnode->super; 780 775 781 return SOS_OK; 776 return SOS_OK; 782 } 777 } 783 778 784 779 785 static sos_ret_t 780 static sos_ret_t 786 virtfs_allocate_new_node(struct sos_fs_manager 781 virtfs_allocate_new_node(struct sos_fs_manager_instance * this, 787 sos_fs_node_type_t ty 782 sos_fs_node_type_t type, 788 const struct sos_proc 783 const struct sos_process * creator, 789 sos_ui32_t access_rig 784 sos_ui32_t access_rights, 790 sos_ui32_t flags, 785 sos_ui32_t flags, 791 struct sos_fs_node ** 786 struct sos_fs_node ** result) 792 { 787 { 793 struct virtfs_node * virtfsnode; 788 struct virtfs_node * virtfsnode; 794 789 795 /* Allow only DIRs, FILEs or special device 790 /* Allow only DIRs, FILEs or special device files */ 796 if ((type != SOS_FS_NODE_REGULAR_FILE) 791 if ((type != SOS_FS_NODE_REGULAR_FILE) 797 && (type != SOS_FS_NODE_SYMLINK) 792 && (type != SOS_FS_NODE_SYMLINK) 798 && (type != SOS_FS_NODE_DIRECTORY) 793 && (type != SOS_FS_NODE_DIRECTORY) 799 && (type != SOS_FS_NODE_DEVICE_CHAR) !! 794 && (type != SOS_FS_NODE_DEVICE_CHAR)) 800 && (type != SOS_FS_NODE_DEVICE_BLOCK)) << 801 return -SOS_ENOSUP; 795 return -SOS_ENOSUP; 802 796 803 virtfsnode = (struct virtfs_node*) sos_kmall 797 virtfsnode = (struct virtfs_node*) sos_kmalloc(sizeof(*virtfsnode), 0); 804 if (! virtfsnode) 798 if (! virtfsnode) 805 return -SOS_ENOMEM; 799 return -SOS_ENOMEM; 806 800 807 memset(virtfsnode, 0x0, sizeof(*virtfsnode)) 801 memset(virtfsnode, 0x0, sizeof(*virtfsnode)); 808 *result = & virtfsnode->super; 802 *result = & virtfsnode->super; 809 803 810 /* Initialize "file" */ 804 /* Initialize "file" */ 811 (*result)->inmem_ref_cnt = 1; 805 (*result)->inmem_ref_cnt = 1; 812 (*result)->custom_data = virtfsnode; 806 (*result)->custom_data = virtfsnode; 813 (*result)->storage_location = (sos_ui64_t)( 807 (*result)->storage_location = (sos_ui64_t)((sos_vaddr_t)virtfsnode); 814 (*result)->type = type; 808 (*result)->type = type; 815 (*result)->access_rights = access_rights 809 (*result)->access_rights = access_rights; 816 (*result)->destructor = virtfs_node_d 810 (*result)->destructor = virtfs_node_destructor; 817 (*result)->ops_file = & virtfs_ops_ 811 (*result)->ops_file = & virtfs_ops_file; 818 812 819 /* The "file" functions are defined by the F 813 /* The "file" functions are defined by the FS code only for 820 non-special device files */ 814 non-special device files */ 821 if ((type != SOS_FS_NODE_DEVICE_CHAR) !! 815 if (type != SOS_FS_NODE_DEVICE_CHAR) 822 && (type != SOS_FS_NODE_DEVICE_BLOCK)) << 823 { 816 { >> 817 (*result)->sync = virtfs_sync_node; 824 (*result)->new_opened_file = virtfs_ne 818 (*result)->new_opened_file = virtfs_new_opened_file; 825 (*result)->close_opened_file = virtfs_cl 819 (*result)->close_opened_file = virtfs_close_opened_file; 826 } 820 } 827 821 828 if (type == SOS_FS_NODE_SYMLINK) 822 if (type == SOS_FS_NODE_SYMLINK) 829 (*result)->ops_symlink = & virtfs_ops_syml 823 (*result)->ops_symlink = & virtfs_ops_symlink; 830 else if (type == SOS_FS_NODE_DIRECTORY) 824 else if (type == SOS_FS_NODE_DIRECTORY) 831 (*result)->ops_dir = & virtfs_ops_dir; 825 (*result)->ops_dir = & virtfs_ops_dir; 832 826 833 /* Initialize mapping structure */ 827 /* Initialize mapping structure */ 834 if (type == SOS_FS_NODE_REGULAR_FILE) 828 if (type == SOS_FS_NODE_REGULAR_FILE) 835 { 829 { 836 virtfsnode->file.mapres.allowed_access_r 830 virtfsnode->file.mapres.allowed_access_rights 837 = SOS_VM_MAP_PROT_READ 831 = SOS_VM_MAP_PROT_READ 838 | SOS_VM_MAP_PROT_WRITE 832 | SOS_VM_MAP_PROT_WRITE 839 | SOS_VM_MAP_PROT_EXEC; 833 | SOS_VM_MAP_PROT_EXEC; 840 virtfsnode->file.mapres.custom_data = 834 virtfsnode->file.mapres.custom_data = virtfsnode; 841 virtfsnode->file.mapres.mmap = 835 virtfsnode->file.mapres.mmap = virtfs_new_mapping; 842 } 836 } 843 837 844 list_add_tail(((struct virtfs_instance*)this 838 list_add_tail(((struct virtfs_instance*)this->custom_data)->list_fsnodes, 845 virtfsnode); 839 virtfsnode); 846 840 847 return SOS_OK; 841 return SOS_OK; 848 } 842 } 849 843 850 844 851 /* ******************************************* 845 /* ******************************************************** 852 * FS type (mount/umount) operations 846 * FS type (mount/umount) operations 853 */ 847 */ 854 848 855 static sos_ret_t virtfs_mount(struct sos_fs_ma 849 static sos_ret_t virtfs_mount(struct sos_fs_manager_type * this, 856 struct sos_fs_no 850 struct sos_fs_node * device, 857 const char * arg 851 const char * args, 858 struct sos_fs_ma 852 struct sos_fs_manager_instance ** mounted_fs) 859 { 853 { 860 sos_ret_t retval; 854 sos_ret_t retval; 861 struct virtfs_instance * fs; 855 struct virtfs_instance * fs; 862 struct sos_fs_node * fsnode_root; 856 struct sos_fs_node * fsnode_root; 863 struct sos_hash_table * hash; 857 struct sos_hash_table * hash; 864 858 865 *mounted_fs = (struct sos_fs_manager_instanc 859 *mounted_fs = (struct sos_fs_manager_instance*)NULL; 866 860 867 /* Create FS node hash table */ 861 /* Create FS node hash table */ 868 hash = sos_hash_create("virtfs H", struct so 862 hash = sos_hash_create("virtfs H", struct sos_fs_node, 869 sos_hash_ui64, 863 sos_hash_ui64, 870 sos_hash_key_eq_ui64, 864 sos_hash_key_eq_ui64, 17, 871 storage_location, hli 865 storage_location, hlink_nodecache); 872 if (! hash) 866 if (! hash) 873 return -SOS_ENOMEM; 867 return -SOS_ENOMEM; 874 868 875 fs = (struct virtfs_instance*) 869 fs = (struct virtfs_instance*) 876 sos_kmalloc(sizeof(struct virtfs_instance) 870 sos_kmalloc(sizeof(struct virtfs_instance), 0); 877 if (! fs) 871 if (! fs) 878 { 872 { 879 sos_hash_dispose(hash); 873 sos_hash_dispose(hash); 880 return -SOS_ENOMEM; 874 return -SOS_ENOMEM; 881 } 875 } 882 876 883 memset(fs, 0x0, sizeof(struct virtfs_instanc 877 memset(fs, 0x0, sizeof(struct virtfs_instance)); 884 retval = sos_kmutex_init(& fs->lock, "virtfs 878 retval = sos_kmutex_init(& fs->lock, "virtfs", SOS_KWQ_ORDER_FIFO); 885 if (SOS_OK != retval) 879 if (SOS_OK != retval) 886 { 880 { 887 sos_hash_dispose(hash); 881 sos_hash_dispose(hash); 888 sos_kfree((sos_vaddr_t) fs); 882 sos_kfree((sos_vaddr_t) fs); 889 return retval; 883 return retval; 890 } 884 } 891 fs->super.custom_data = fs; 885 fs->super.custom_data = fs; 892 fs->super.fs_type = this; 886 fs->super.fs_type = this; 893 fs->super.allocate_new_node = virtfs_allo 887 fs->super.allocate_new_node = virtfs_allocate_new_node; 894 fs->super.fetch_node_from_disk = virtfs_fetc 888 fs->super.fetch_node_from_disk = virtfs_fetch_node_from_disk; 895 fs->super.nodecache = hash; 889 fs->super.nodecache = hash; 896 890 897 retval = virtfs_allocate_new_node(& fs->supe 891 retval = virtfs_allocate_new_node(& fs->super, SOS_FS_NODE_DIRECTORY, 898 NULL, 892 NULL, 899 SOS_FS_REA 893 SOS_FS_READABLE | SOS_FS_WRITABLE 900 | SOS_FS_E 894 | SOS_FS_EXECUTABLE, 901 0, 895 0, 902 & fsnode_r 896 & fsnode_root); 903 if (SOS_OK != retval) 897 if (SOS_OK != retval) 904 { 898 { 905 sos_hash_dispose(hash); 899 sos_hash_dispose(hash); 906 sos_kmutex_dispose(& fs->lock); 900 sos_kmutex_dispose(& fs->lock); 907 sos_kfree((sos_vaddr_t) fs); 901 sos_kfree((sos_vaddr_t) fs); 908 return retval; 902 return retval; 909 } 903 } 910 904 911 retval = sos_fs_register_fs_instance(& fs->s 905 retval = sos_fs_register_fs_instance(& fs->super, fsnode_root); 912 sos_fs_unref_fsnode(fsnode_root); 906 sos_fs_unref_fsnode(fsnode_root); 913 if (SOS_OK != retval) 907 if (SOS_OK != retval) 914 { 908 { 915 sos_hash_dispose(hash); 909 sos_hash_dispose(hash); 916 sos_kmutex_dispose(& fs->lock); 910 sos_kmutex_dispose(& fs->lock); 917 sos_kfree((sos_vaddr_t) fs); 911 sos_kfree((sos_vaddr_t) fs); 918 return retval; 912 return retval; 919 } 913 } 920 914 921 *mounted_fs = & fs->super; 915 *mounted_fs = & fs->super; 922 return SOS_OK; 916 return SOS_OK; 923 } 917 } 924 918 925 919 926 static sos_ret_t virtfs_umount(struct sos_fs_m 920 static sos_ret_t virtfs_umount(struct sos_fs_manager_type * this, 927 struct sos_fs_m 921 struct sos_fs_manager_instance * mounted_fs) 928 { 922 { 929 struct virtfs_instance * virtfs = (struct vi 923 struct virtfs_instance * virtfs = (struct virtfs_instance*)mounted_fs->custom_data; 930 924 931 sos_hash_dispose(virtfs->super.nodecache); 925 sos_hash_dispose(virtfs->super.nodecache); 932 while (! list_is_empty(virtfs->list_fsnodes) 926 while (! list_is_empty(virtfs->list_fsnodes)) 933 { 927 { 934 struct virtfs_node * virtfsnode = list_p 928 struct virtfs_node * virtfsnode = list_pop_head(virtfs->list_fsnodes); 935 929 936 if (virtfsnode->super.type == SOS_FS_NOD 930 if (virtfsnode->super.type == SOS_FS_NODE_REGULAR_FILE) 937 { 931 { 938 if (virtfsnode->file.size > 0) 932 if (virtfsnode->file.size > 0) 939 sos_kfree((sos_vaddr_t) virtfsnode 933 sos_kfree((sos_vaddr_t) virtfsnode->file.data); 940 } 934 } 941 else if (virtfsnode->super.type == SOS_F 935 else if (virtfsnode->super.type == SOS_FS_NODE_DIRECTORY) 942 { 936 { 943 while (! list_is_empty_named(virtfsn 937 while (! list_is_empty_named(virtfsnode->dir.list_entries, 944 sibling 938 sibling_prev, sibling_next)) 945 { 939 { 946 struct virtfs_direntry * direntr 940 struct virtfs_direntry * direntry 947 = list_pop_head_named(virtfsno 941 = list_pop_head_named(virtfsnode->dir.list_entries, 948 sibling_ 942 sibling_prev, sibling_next); 949 943 950 sos_kfree((sos_vaddr_t)direntry- 944 sos_kfree((sos_vaddr_t)direntry->name); 951 sos_kfree((sos_vaddr_t)direntry) 945 sos_kfree((sos_vaddr_t)direntry); 952 } 946 } 953 } 947 } 954 948 955 sos_kfree((sos_vaddr_t)virtfsnode); 949 sos_kfree((sos_vaddr_t)virtfsnode); 956 } 950 } 957 951 958 sos_fs_unregister_fs_instance(& virtfs->supe 952 sos_fs_unregister_fs_instance(& virtfs->super); 959 sos_kmutex_dispose(& virtfs->lock); 953 sos_kmutex_dispose(& virtfs->lock); 960 sos_kfree((sos_vaddr_t)virtfs); 954 sos_kfree((sos_vaddr_t)virtfs); 961 return SOS_OK; 955 return SOS_OK; 962 } 956 } 963 957 964 958 965 /* ******************************************* 959 /* ******************************************************** 966 * File mapping stuff 960 * File mapping stuff 967 */ 961 */ 968 inline static struct virtfs_node * 962 inline static struct virtfs_node * 969 get_virtfsnode_of_vr(struct sos_umem_vmm_vr * 963 get_virtfsnode_of_vr(struct sos_umem_vmm_vr * vr) 970 { 964 { 971 struct sos_umem_vmm_mapped_resource *mr 965 struct sos_umem_vmm_mapped_resource *mr 972 = sos_umem_vmm_get_mapped_resource_of_vr(v 966 = sos_umem_vmm_get_mapped_resource_of_vr(vr); 973 967 974 return (struct virtfs_node *)mr->custom_data 968 return (struct virtfs_node *)mr->custom_data; 975 } 969 } 976 970 977 971 978 static void virtfs_map_ref(struct sos_umem_vmm 972 static void virtfs_map_ref(struct sos_umem_vmm_vr * vr) 979 { 973 { 980 struct virtfs_node * virtfsnode = get_virtfs 974 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 981 sos_fs_ref_fsnode(& virtfsnode->super); 975 sos_fs_ref_fsnode(& virtfsnode->super); 982 virtfsnode->file.num_mappings ++; 976 virtfsnode->file.num_mappings ++; 983 } 977 } 984 978 985 979 986 static void virtfs_map_unref(struct sos_umem_v 980 static void virtfs_map_unref(struct sos_umem_vmm_vr * vr) 987 { 981 { 988 struct virtfs_node * virtfsnode = get_virtfs 982 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 989 983 990 SOS_ASSERT_FATAL(virtfsnode->file.num_mappin 984 SOS_ASSERT_FATAL(virtfsnode->file.num_mappings > 0); 991 virtfsnode->file.num_mappings --; 985 virtfsnode->file.num_mappings --; 992 986 993 _sos_fs_unref_fsnode(& virtfsnode->super); 987 _sos_fs_unref_fsnode(& virtfsnode->super); 994 } 988 } 995 989 996 990 997 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, 998 sos_uaddr_ 992 sos_uaddr_t uaddr, 999 sos_bool_t 993 sos_bool_t write_access) 1000 { 994 { 1001 struct virtfs_node * virtfsnode = get_virtf 995 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 1002 sos_luoffset_t offset = uaddr - sos_umem_vm 996 sos_luoffset_t offset = uaddr - sos_umem_vmm_get_start_of_vr(vr); 1003 sos_ret_t retval = SOS_OK; 997 sos_ret_t retval = SOS_OK; 1004 sos_paddr_t ppage_paddr; 998 sos_paddr_t ppage_paddr; 1005 999 1006 /* The region is not allowed to be resized 1000 /* The region is not allowed to be resized */ 1007 if (SOS_PAGE_ALIGN_SUP(offset) > virtfsnode 1001 if (SOS_PAGE_ALIGN_SUP(offset) > virtfsnode->file.size) 1008 return -SOS_EFAULT; 1002 return -SOS_EFAULT; 1009 1003 1010 /* Lookup physical kernel page */ 1004 /* Lookup physical kernel page */ 1011 ppage_paddr = sos_paging_get_paddr(SOS_PAGE 1005 ppage_paddr = sos_paging_get_paddr(SOS_PAGE_ALIGN_INF(virtfsnode->file.data 1012 1006 + offset)); 1013 1007 1014 /* Cannot access unmapped kernel pages */ 1008 /* Cannot access unmapped kernel pages */ 1015 if (! ppage_paddr) 1009 if (! ppage_paddr) 1016 return -SOS_EFAULT; 1010 return -SOS_EFAULT; 1017 1011 1018 /* Remap it in user space */ 1012 /* Remap it in user space */ 1019 retval = sos_paging_map(ppage_paddr, 1013 retval = sos_paging_map(ppage_paddr, 1020 SOS_PAGE_ALIGN_INF( 1014 SOS_PAGE_ALIGN_INF(uaddr), 1021 TRUE, 1015 TRUE, 1022 sos_umem_vmm_get_pr 1016 sos_umem_vmm_get_prot_of_vr(vr)); 1023 1017 1024 return retval; 1018 return retval; 1025 } 1019 } 1026 1020 1027 1021 1028 static struct sos_umem_vmm_vr_ops virtfs_map_ 1022 static struct sos_umem_vmm_vr_ops virtfs_map_ops 1029 = (struct sos_umem_vmm_vr_ops){ 1023 = (struct sos_umem_vmm_vr_ops){ 1030 .ref = virtfs_map_ref, 1024 .ref = virtfs_map_ref, 1031 .unref = virtfs_map_unref, 1025 .unref = virtfs_map_unref, 1032 .page_in = virtfs_map_page_in 1026 .page_in = virtfs_map_page_in 1033 }; 1027 }; 1034 1028 1035 static sos_ret_t virtfs_new_mapping(struct so 1029 static sos_ret_t virtfs_new_mapping(struct sos_umem_vmm_vr *vr) 1036 { 1030 { 1037 struct virtfs_node * virtfsnode = get_virtf 1031 struct virtfs_node * virtfsnode = get_virtfsnode_of_vr(vr); 1038 sos_size_t reqsize; 1032 sos_size_t reqsize; 1039 sos_ret_t retval; 1033 sos_ret_t retval; 1040 1034 1041 reqsize = sos_umem_vmm_get_offset_in_resou 1035 reqsize = sos_umem_vmm_get_offset_in_resource(vr); 1042 reqsize += sos_umem_vmm_get_size_of_vr(vr); 1036 reqsize += sos_umem_vmm_get_size_of_vr(vr); 1043 1037 1044 /* Resize the region NOW */ 1038 /* Resize the region NOW */ 1045 if (reqsize > virtfsnode->file.size) 1039 if (reqsize > virtfsnode->file.size) 1046 { 1040 { 1047 retval = virtfs_resize(virtfsnode, 1041 retval = virtfs_resize(virtfsnode, 1048 SOS_PAGE_ALIGN_S 1042 SOS_PAGE_ALIGN_SUP(reqsize)); 1049 if (SOS_OK != retval) 1043 if (SOS_OK != retval) 1050 return retval; 1044 return retval; 1051 } 1045 } 1052 1046 1053 return sos_umem_vmm_set_ops_of_vr(vr, &virt 1047 return sos_umem_vmm_set_ops_of_vr(vr, &virtfs_map_ops); 1054 } 1048 }
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