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001 /* Copyright (C) 2005,2006 David Decotigny !! 001 /* Copyright (C) 2005 David Decotigny 002 Copyright (C) 2000-2005 The KOS Team (Thoma 002 Copyright (C) 2000-2005 The KOS Team (Thomas Petazzoni, David 003 Decotigny, Julien M 003 Decotigny, Julien Munier) 004 004 005 This program is free software; you can redi 005 This program is free software; you can redistribute it and/or 006 modify it under the terms of the GNU Genera 006 modify it under the terms of the GNU General Public License 007 as published by the Free Software Foundatio 007 as published by the Free Software Foundation; either version 2 008 of the License, or (at your option) any lat 008 of the License, or (at your option) any later version. 009 009 010 This program is distributed in the hope tha 010 This program is distributed in the hope that it will be useful, 011 but WITHOUT ANY WARRANTY; without even the 011 but WITHOUT ANY WARRANTY; without even the implied warranty of 012 MERCHANTABILITY or FITNESS FOR A PARTICULAR 012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 013 GNU General Public License for more details 013 GNU General Public License for more details. 014 014 015 You should have received a copy of the GNU 015 You should have received a copy of the GNU General Public License 016 along with this program; if not, write to t 016 along with this program; if not, write to the Free Software 017 Foundation, Inc., 59 Temple Place - Suite 3 017 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 018 USA. 018 USA. 019 */ 019 */ 020 #ifndef _SOS_FS_H_ 020 #ifndef _SOS_FS_H_ 021 #define _SOS_FS_H_ 021 #define _SOS_FS_H_ 022 022 023 023 024 /** 024 /** 025 * @file fs.h 025 * @file fs.h 026 * 026 * 027 * (Virtual) Filesystem management. 027 * (Virtual) Filesystem management. 028 * 028 * 029 * SOS provides a complete Unix-like file syst 029 * SOS provides a complete Unix-like file system service. Supported 030 * features of this service are: 030 * features of this service are: 031 * - mountpoints 031 * - mountpoints 032 * - generic file system support (FS) throug 032 * - generic file system support (FS) through object-oriented 033 * specialization (so-called VFS) 033 * specialization (so-called VFS) 034 * - hard & symbolic links 034 * - hard & symbolic links 035 * - regular files and directories 035 * - regular files and directories 036 * - block and character device special file 036 * - block and character device special files (from article 9 onward) 037 * - file mapping 037 * - file mapping 038 * - basic permission management ("rwx" only 038 * - basic permission management ("rwx" only, no notion of owner) 039 * - chroot 039 * - chroot 040 * - separation of disk node and namespace n 040 * - separation of disk node and namespace notions allowing hard links 041 * and to move/rename/remove files or dire 041 * and to move/rename/remove files or directories that are in use 042 * - basic FS interface (open/read/seek/crea 042 * - basic FS interface (open/read/seek/creat/mkdir/rename/link 043 * / symlink/chmod/mount/fcntl/ioctl...) 043 * / symlink/chmod/mount/fcntl/ioctl...) 044 * - deferred writes (ie file caching). @see 044 * - deferred writes (ie file caching). @see sync(3) 045 * 045 * 046 * Among the unsupported features: 046 * Among the unsupported features: 047 * - no user-based permission (uid/gid, ACLS 047 * - no user-based permission (uid/gid, ACLS) 048 * - no modification / access time accountin 048 * - no modification / access time accounting 049 * - no Fifo/socket special files (yet) 049 * - no Fifo/socket special files (yet) 050 * - no generic support library for common f 050 * - no generic support library for common fcntl commands 051 * (F_SETOWN/GETLEASE/NOTIFY, etc.) 051 * (F_SETOWN/GETLEASE/NOTIFY, etc.) 052 * - no flock-style functions 052 * - no flock-style functions 053 * 053 * 054 * Rationale 054 * Rationale 055 * ========= 055 * ========= 056 * The VFS layer is based on 3 central concept 056 * The VFS layer is based on 3 central concepts: 057 * 057 * 058 * - The meta-information for each file store 058 * - The meta-information for each file stored on disk: size, 059 * permissions, ... (struct sos_fs_node for 059 * permissions, ... (struct sos_fs_node for SOS, inode for Unix) 060 * 060 * 061 * It is sufficient to know where this meta 061 * It is sufficient to know where this meta-information is located 062 * on disk (a simple sector number most of 062 * on disk (a simple sector number most of the time) to build the 063 * corresponding struct sos_fs_node into me 063 * corresponding struct sos_fs_node into memory and to retrieve the 064 * data of the file from the disk 064 * data of the file from the disk 065 * 065 * 066 * For example, consider that we know a sec 066 * For example, consider that we know a sector that holds the meta 067 * information is located at sector 64589 o 067 * information is located at sector 64589 on disk. By retrieving 068 * this meta information directly from disk 068 * this meta information directly from disk, we can build the 069 * struct sos_fs_node, which would (for exa 069 * struct sos_fs_node, which would (for example) tell that the 070 * corresponding file spans (for example) o 070 * corresponding file spans (for example) over sectors 4345, 5645, 071 * 4539 and 6575, is 1.7kB long 071 * 4539 and 6575, is 1.7kB long 072 * 072 * 073 * Everything is stored this way on the dis 073 * Everything is stored this way on the disk, even the 074 * directories. From the disk contents' poi 074 * directories. From the disk contents' point of view, a directory 075 * is simply a file whose contents represen 075 * is simply a file whose contents represent a list of mappings 076 * "name" -> meta-information location 076 * "name" -> meta-information location 077 * 077 * 078 * - One or many nodes in the file hierarchy 078 * - One or many nodes in the file hierarchy pointing to this data 079 * (struct sos_fs_nscache_node for SOS, str 079 * (struct sos_fs_nscache_node for SOS, struct dentry for Linux). This 080 * tells that the entry "toto" in directory 080 * tells that the entry "toto" in directory "/home/zorglub" 081 * corresponds to the given struct sos_fs_n 081 * corresponds to the given struct sos_fs_node 082 * 082 * 083 * Actually, with the struct sos_fs_node ab 083 * Actually, with the struct sos_fs_node above, we can reach any 084 * file in the system. However, dealing wit 084 * file in the system. However, dealing with mountpoints requires 085 * an intermediary data structure because a 085 * an intermediary data structure because a directory on a disk 086 * cannot make reference to children struct 086 * cannot make reference to children struct sos_fs_node on other 087 * disk. This is one of the reasons why the 087 * disk. This is one of the reasons why there is this struct 088 * sos_fs_nscache_node. Another reason is t 088 * sos_fs_nscache_node. Another reason is that we kind-of "cache" the 089 * most used struct sos_fs_node: those that 089 * most used struct sos_fs_node: those that lead from the global 090 * root ("/") to the files and directories 090 * root ("/") to the files and directories currently being used 091 * (hence the name "nscache" for "namespace 091 * (hence the name "nscache" for "namespace cache"). This speeds-up 092 * the path-resolving process (aka "lookup" 092 * the path-resolving process (aka "lookup"), as the most-used path 093 * are already in-memory and the struct sos 093 * are already in-memory and the struct sos_fs_node are already 094 * in-memory too. 094 * in-memory too. 095 * 095 * 096 * A struct sos_fs_nscache_node can have at 096 * A struct sos_fs_nscache_node can have at most 1 parent (the ".." 097 * entry). It can also have 0 parent in cas 097 * entry). It can also have 0 parent in case the node is being used 098 * by a process (file is opened or mapped), 098 * by a process (file is opened or mapped), but the file is 099 * actually "removed", ie un-reachable from 099 * actually "removed", ie un-reachable from any directory. 100 * 100 * 101 * Many such structures can reference the s 101 * Many such structures can reference the same underlying struct 102 * sos_fs_node, which enables the support o 102 * sos_fs_node, which enables the support of "hard links". 103 * 103 * 104 * - The "opened file" strucures. They store 104 * - The "opened file" strucures. They store the information 105 * pertaining to a particular usage of a fi 105 * pertaining to a particular usage of a file. The most important 106 * thing they store is the "file pointer", 106 * thing they store is the "file pointer", which holds the 107 * location in the file where the next read 107 * location in the file where the next read/write operation should 108 * start 108 * start 109 * 109 * 110 * Each process has at least 2 such opened 110 * Each process has at least 2 such opened files: its "current 111 * working directory" (RTFM chdir) and its 111 * working directory" (RTFM chdir) and its "process root" (RTFM 112 * chroot). Those are heritated across fork 112 * chroot). Those are heritated across fork() and can be changed by 113 * appropriate syscalls (resp. chdir/chroot 113 * appropriate syscalls (resp. chdir/chroot). The main "root" of 114 * the system is the process root of the "i 114 * the system is the process root of the "init" process. The usual 115 * opened files (think of open() and opendi 115 * opened files (think of open() and opendir()) are stored in the 116 * file descriptor array (fds[]). This is t 116 * file descriptor array (fds[]). This is the index in this array 117 * that is commonly called a "file descript 117 * that is commonly called a "file descriptor". 118 * 118 * 119 * 119 * 120 * The whole VFS layer comprises a series of o 120 * The whole VFS layer comprises a series of objects that can be 121 * specialized to implement different FS suppo 121 * specialized to implement different FS support (fat, ext2, ffs, ...): 122 * 122 * 123 * - The notion of "file system manager", whi 123 * - The notion of "file system manager", which basically is a 124 * container to a FS name (eg "FAT", "EXT2" 124 * container to a FS name (eg "FAT", "EXT2", etc...) and a series of 125 * functions responsible for initializing a 125 * functions responsible for initializing a particular "mounting" of 126 * a FS (the "mount" method). This is SOS's 126 * a FS (the "mount" method). This is SOS's struct sos_fs_manager_type 127 * 127 * 128 * - The notion of "file system instance" whi 128 * - The notion of "file system instance" which contains the data 129 * proper to a particular mounting of an FS 129 * proper to a particular mounting of an FS. Its most important job 130 * is to allocate new struct sos_fs_node on 130 * is to allocate new struct sos_fs_node on disk, or to retrieve the 131 * meta-information (ie struct sos_fs_node) 131 * meta-information (ie struct sos_fs_node) located at the given 132 * location on disk. This is roughly THE pr 132 * location on disk. This is roughly THE primary physical interface 133 * between the VFS and the disks. This is S 133 * between the VFS and the disks. This is SOS's struct 134 * sos_fs_manager_instance, aka the Linux's 134 * sos_fs_manager_instance, aka the Linux's superblock 135 * 135 * 136 * For each struct sos_fs_node that it allo 136 * For each struct sos_fs_node that it allocates, or that is loads 137 * from disk into memory, this "instance ma 137 * from disk into memory, this "instance manager" is responsible 138 * for inidicating the functions that imple 138 * for inidicating the functions that implement the FS-dedicated 139 * routine such as read/write/mmap/ioctl/.. 139 * routine such as read/write/mmap/ioctl/... for this precise node. 140 * 140 * 141 * The nodes (struct sos_fs_node) of a stru 141 * The nodes (struct sos_fs_node) of a struct 142 * sos_fs_manager_instance that are current 142 * sos_fs_manager_instance that are currently loaded in memory are 143 * stored in a hash-table. The key of this 143 * stored in a hash-table. The key of this map is the location of the 144 * meta-information on disk. That way, it i 144 * meta-information on disk. That way, it is very fast to look for 145 * the given meta-information whose locatio 145 * the given meta-information whose location on disk is knows: if 146 * it has already been loaded into memory, 146 * it has already been loaded into memory, its memory address is 147 * quickly resolved thanks to this hash tab 147 * quickly resolved thanks to this hash table. 148 */ 148 */ 149 149 150 #include <sos/types.h> 150 #include <sos/types.h> 151 #include <sos/errno.h> 151 #include <sos/errno.h> 152 #include <sos/hash.h> 152 #include <sos/hash.h> 153 #include <sos/umem_vmm.h> 153 #include <sos/umem_vmm.h> 154 154 155 /* Forward declarations (structures defined in 155 /* Forward declarations (structures defined in this file) */ 156 struct sos_fs_manager_type; 156 struct sos_fs_manager_type; 157 struct sos_fs_manager_instance; 157 struct sos_fs_manager_instance; 158 struct sos_fs_statfs; 158 struct sos_fs_statfs; 159 struct sos_fs_node; 159 struct sos_fs_node; 160 struct sos_fs_opened_file; 160 struct sos_fs_opened_file; 161 struct sos_fs_stat; 161 struct sos_fs_stat; 162 162 163 #include "fs_nscache.h" 163 #include "fs_nscache.h" 164 #include <sos/blkdev.h> << 165 164 166 /** 165 /** 167 * The type of filesystem object. 166 * The type of filesystem object. 168 * 167 * 169 * Each struct sos_fs_node has a type. Here ar 168 * Each struct sos_fs_node has a type. Here are the supported types. 170 */ 169 */ 171 typedef enum { 170 typedef enum { 172 SOS_FS_NODE_REGULAR_FILE = 0x42, 171 SOS_FS_NODE_REGULAR_FILE = 0x42, 173 SOS_FS_NODE_DIRECTORY = 0x24, 172 SOS_FS_NODE_DIRECTORY = 0x24, 174 SOS_FS_NODE_SYMLINK = 0x84, 173 SOS_FS_NODE_SYMLINK = 0x84, 175 SOS_FS_NODE_DEVICE_CHAR = 0x48, 174 SOS_FS_NODE_DEVICE_CHAR = 0x48, 176 SOS_FS_NODE_DEVICE_BLOCK = 0x12 << 177 } sos_fs_node_type_t; 175 } sos_fs_node_type_t; 178 176 179 177 180 #define SOS_FS_MANAGER_NAME_MAXLEN 32 178 #define SOS_FS_MANAGER_NAME_MAXLEN 32 181 /** 179 /** 182 * Description of a supported Filesystem type. 180 * Description of a supported Filesystem type. 183 * 181 * 184 * These descriptions are listed in an interna 182 * These descriptions are listed in an internal list (see 185 * fs.c:fs_list), and each time we want to mou 183 * fs.c:fs_list), and each time we want to mount a FS, we precise a 186 * name (eg "FAT", "EXT2", ...). The VFS will 184 * name (eg "FAT", "EXT2", ...). The VFS will look for this name into 187 * the list of supported filesystem types, and 185 * the list of supported filesystem types, and, when found, call its 188 * sos_fs_manager_type::mount() method. 186 * sos_fs_manager_type::mount() method. 189 * 187 * 190 * New filesystem types are registered using s 188 * New filesystem types are registered using sos_fs_register_fs_type() 191 */ 189 */ 192 struct sos_fs_manager_type 190 struct sos_fs_manager_type 193 { 191 { 194 char name[SOS_FS_MANAGER_NAME_MAXLEN]; 192 char name[SOS_FS_MANAGER_NAME_MAXLEN]; 195 193 196 /** 194 /** 197 * Responsible for making sure the underlyin 195 * Responsible for making sure the underlying device (if any) really 198 * stores the correct filesystem format, for 196 * stores the correct filesystem format, for creating the hash of fs 199 * nodes and for calling sos_fs_register_fs_ 197 * nodes and for calling sos_fs_register_fs_instance 200 * 198 * 201 * @param device May be NULL 199 * @param device May be NULL 202 * 200 * 203 * @note mandatory, may block 201 * @note mandatory, may block 204 */ 202 */ 205 sos_ret_t (*mount)(struct sos_fs_manager_typ 203 sos_ret_t (*mount)(struct sos_fs_manager_type * this, 206 struct sos_fs_node * devi 204 struct sos_fs_node * device, 207 const char * args, 205 const char * args, 208 struct sos_fs_manager_ins 206 struct sos_fs_manager_instance ** mounted_fs); 209 207 210 /** 208 /** 211 * Responsible for de-allocating the hash of 209 * Responsible for de-allocating the hash of fs nodes and for 212 * calling sos_fs_unregister_fs_instance 210 * calling sos_fs_unregister_fs_instance 213 * 211 * 214 * @note mandatory, may block 212 * @note mandatory, may block 215 */ 213 */ 216 sos_ret_t (*umount)(struct sos_fs_manager_ty 214 sos_ret_t (*umount)(struct sos_fs_manager_type * this, 217 struct sos_fs_manager_in 215 struct sos_fs_manager_instance * mounted_fs); 218 216 219 /** Free of use */ 217 /** Free of use */ 220 void * custom_data; 218 void * custom_data; 221 219 222 /** List of filesystem instances of this typ 220 /** List of filesystem instances of this type currently mounted 223 somewhere in the system */ 221 somewhere in the system */ 224 struct sos_fs_manager_instance * instances; 222 struct sos_fs_manager_instance * instances; 225 223 226 /** Linkage for the list of filesystem types 224 /** Linkage for the list of filesystem types registered in the 227 system */ 225 system */ 228 struct sos_fs_manager_type *prev, *next; 226 struct sos_fs_manager_type *prev, *next; 229 }; 227 }; 230 228 231 229 232 /** 230 /** 233 * Data related to a particular "mounting" of 231 * Data related to a particular "mounting" of a file system. A 234 * so-called "superblock" under Linux 232 * so-called "superblock" under Linux 235 * 233 * 236 * This holds the FUNDAMENTAL functions respon 234 * This holds the FUNDAMENTAL functions responsible for loading struct 237 * sos_fs_node from disk, or for allocating th 235 * sos_fs_node from disk, or for allocating thom on disk. It also 238 * holds the hash-table of struct sos_fs_node 236 * holds the hash-table of struct sos_fs_node already loaded into 239 * memory. 237 * memory. 240 */ 238 */ 241 struct sos_fs_manager_instance 239 struct sos_fs_manager_instance 242 { 240 { 243 /** 241 /** 244 * @note Publicly readable. Written only by 242 * @note Publicly readable. Written only by sos_fs_manager_type::mount() 245 */ 243 */ 246 struct sos_fs_manager_type * fs_type; 244 struct sos_fs_manager_type * fs_type; 247 245 248 /** 246 /** 249 * Usually, a filesystem relies on a device 247 * Usually, a filesystem relies on a device (disk, network, ram, 250 * ...) to fetch its data. This is the locat 248 * ...) to fetch its data. This is the location of the device. 251 * 249 * 252 * @note Publicly readable. Written only by 250 * @note Publicly readable. Written only by fs.c 253 */ 251 */ 254 struct sos_fs_node * device; 252 struct sos_fs_node * device; 255 253 256 #define SOS_FS_MOUNT_SYNC (1 << 0) 254 #define SOS_FS_MOUNT_SYNC (1 << 0) 257 #define SOS_FS_MOUNT_READONLY (1 << 1) 255 #define SOS_FS_MOUNT_READONLY (1 << 1) 258 #define SOS_FS_MOUNT_NOEXEC (1 << 2) 256 #define SOS_FS_MOUNT_NOEXEC (1 << 2) 259 /** 257 /** 260 * Is this FS read-only, without EXEC file p 258 * Is this FS read-only, without EXEC file permission, write-through 261 * ? Or-red combination of the SOS_FS_MOUNT_ 259 * ? Or-red combination of the SOS_FS_MOUNT_ flags 262 * 260 * 263 * @note Publicly readable. Written only by 261 * @note Publicly readable. Written only by fs.c 264 */ 262 */ 265 sos_ui32_t flags; 263 sos_ui32_t flags; 266 264 267 /** 265 /** 268 * The namespace node that is the root of TH 266 * The namespace node that is the root of THIS file system mounting 269 * 267 * 270 * @note Publicly readable. Written only by 268 * @note Publicly readable. Written only by fs.c 271 */ 269 */ 272 struct sos_fs_nscache_node * root; 270 struct sos_fs_nscache_node * root; 273 271 274 /** 272 /** 275 * List of dirty nodes. These are the nodes 273 * List of dirty nodes. These are the nodes that need to be written 276 * back to disk. With FS supporting deferred 274 * back to disk. With FS supporting deferred-writes, the 277 * sos_fs_sync() function will use this list 275 * sos_fs_sync() function will use this list to flush the dirty 278 * nodes back to disk. 276 * nodes back to disk. 279 * 277 * 280 * @note Reserved to fs.c 278 * @note Reserved to fs.c 281 */ 279 */ 282 struct sos_fs_node * dirty_nodes; 280 struct sos_fs_node * dirty_nodes; 283 281 284 /** 282 /** 285 * Build a fresh new FS node at the given lo 283 * Build a fresh new FS node at the given location. This implies 286 * the allocation of a new sos_fs_node struc 284 * the allocation of a new sos_fs_node structure in memory 287 * 285 * 288 * @note Mandatory, may block. Appropriate l 286 * @note Mandatory, may block. Appropriate locking MUST be implemented 289 */ 287 */ 290 sos_ret_t (*fetch_node_from_disk)(struct sos 288 sos_ret_t (*fetch_node_from_disk)(struct sos_fs_manager_instance * this, 291 sos_ui64_t 289 sos_ui64_t storage_location, 292 struct sos 290 struct sos_fs_node ** result); 293 291 294 /** 292 /** 295 * Build a fresh new FS node ON THE DISK of 293 * Build a fresh new FS node ON THE DISK of the given type (dir, 296 * plain file, symlink, ...), completely emp 294 * plain file, symlink, ...), completely empty ; return a newly 297 * allocated IN-MEMORY node structure repres 295 * allocated IN-MEMORY node structure representing it 298 * 296 * 299 * @param open_creat_flags is the open_flags 297 * @param open_creat_flags is the open_flags parameter passed to 300 * sos_fs_open() when O_CREAT is set. 0 when 298 * sos_fs_open() when O_CREAT is set. 0 when allocated trough 301 * creat/mkdir/mknod/symlink 299 * creat/mkdir/mknod/symlink 302 * 300 * 303 * @note Mandatory, may block. Appropriate l 301 * @note Mandatory, may block. Appropriate locking MUST be implemented 304 */ 302 */ 305 sos_ret_t (*allocate_new_node)(struct sos_fs 303 sos_ret_t (*allocate_new_node)(struct sos_fs_manager_instance * this, 306 sos_fs_node_t 304 sos_fs_node_type_t type, 307 const struct 305 const struct sos_process * creator, 308 sos_ui32_t ac 306 sos_ui32_t access_rights, 309 sos_ui32_t op 307 sos_ui32_t open_creat_flags, 310 struct sos_fs 308 struct sos_fs_node ** result); 311 309 312 /** 310 /** 313 * Return filesystem status (RTFM df) 311 * Return filesystem status (RTFM df) 314 * 312 * 315 * @note Optional, may block. Appropriate lo 313 * @note Optional, may block. Appropriate locking MUST be implemented 316 */ 314 */ 317 sos_ret_t (*statfs)(struct sos_fs_manager_in 315 sos_ret_t (*statfs)(struct sos_fs_manager_instance * this, 318 struct sos_fs_statfs * r 316 struct sos_fs_statfs * result); 319 317 320 /** 318 /** 321 * Comparison callback called when looking f 319 * Comparison callback called when looking for file/dirs in the 322 * namespace cache. Normally, a usual lexico 320 * namespace cache. Normally, a usual lexicographical comparison is 323 * done (when this function points to NULL). 321 * done (when this function points to NULL). But for some FS, it 324 * might be useful to use another comparison 322 * might be useful to use another comparison function (eg for 325 * case-insensitive FS) 323 * case-insensitive FS) 326 * 324 * 327 * @note Optional (may be NULL), must NOT bl 325 * @note Optional (may be NULL), must NOT block 328 */ 326 */ 329 sos_bool_t (*nsnode_same_name)(const char * 327 sos_bool_t (*nsnode_same_name)(const char * name1, sos_ui16_t namelen1, 330 const char * 328 const char * name2, sos_ui16_t namelen2); 331 329 332 /** 330 /** 333 * Hash table of the struct sos_fs_node of t 331 * Hash table of the struct sos_fs_node of this filesystem instance 334 * loaded in memory: key=storage_location, e 332 * loaded in memory: key=storage_location, element=sos_fs_node 335 */ 333 */ 336 struct sos_hash_table * nodecache; 334 struct sos_hash_table * nodecache; 337 335 338 /** 336 /** 339 * Unique identifier of this FS (used in syn 337 * Unique identifier of this FS (used in sync method, updated by 340 * fs.c). This enables sync_all_fs to be res 338 * fs.c). This enables sync_all_fs to be resilient to mount/umount 341 * and (un)register_fs_type/instance 339 * and (un)register_fs_type/instance 342 */ 340 */ 343 sos_ui64_t uid; 341 sos_ui64_t uid; 344 342 345 void * custom_data; 343 void * custom_data; 346 344 347 /** Linkage for the list of instances for th 345 /** Linkage for the list of instances for the underlying fs type */ 348 struct sos_fs_manager_instance * prev, * nex 346 struct sos_fs_manager_instance * prev, * next; 349 }; 347 }; 350 348 351 349 352 /** 350 /** 353 * The CENTRAL data structure of the whole thi 351 * The CENTRAL data structure of the whole thing. A so-called "inode" 354 * 352 * 355 * This represents the meta-information relate 353 * This represents the meta-information related to a file on disk: its 356 * permission, where its data is located. Actu 354 * permission, where its data is located. Actually, in SOS, these 357 * information are not stored in this structur 355 * information are not stored in this structure. Instead, we define a 358 * series of methods in this structure that MU 356 * series of methods in this structure that MUST be implemented by the 359 * FS and that realize the higher level operat 357 * FS and that realize the higher level operations needed by the 360 * OS. These operations will rely on the meta- 358 * OS. These operations will rely on the meta-information that the FS 361 * code MUST define and manage by itself (henc 359 * code MUST define and manage by itself (hence the 362 * sos_fs_node::custom_data field). 360 * sos_fs_node::custom_data field). 363 */ 361 */ 364 struct sos_fs_node 362 struct sos_fs_node 365 { 363 { 366 /** 364 /** 367 * An struct sos_fs_node always belong to ex 365 * An struct sos_fs_node always belong to exactly ONE file system 368 */ 366 */ 369 struct sos_fs_manager_instance * fs; 367 struct sos_fs_manager_instance * fs; 370 368 371 /** 369 /** 372 * The so-called "inode": location of this n 370 * The so-called "inode": location of this node inside the FS 373 * instance. Updated by struct 371 * instance. Updated by struct 374 * sos_fs_manager_instance::fetch_node_from_ 372 * sos_fs_manager_instance::fetch_node_from_disk() 375 */ 373 */ 376 sos_ui64_t storage_location; 374 sos_ui64_t storage_location; 377 375 378 /** 376 /** 379 * Number of ON-DISK links to this node. 377 * Number of ON-DISK links to this node. 380 * 378 * 381 * - For everything but directories: the num 379 * - For everything but directories: the number of hard links to the file 382 * - For directories: 1 + the number of chil 380 * - For directories: 1 + the number of children nodes 383 * 381 * 384 * @note Publicly readable. Written only by 382 * @note Publicly readable. Written only by 385 * sos_fs_node_ops_dir::link() and sos_fs_no 383 * sos_fs_node_ops_dir::link() and sos_fs_node_ops_dir::unlink() 386 */ 384 */ 387 sos_count_t ondisk_lnk_cnt; 385 sos_count_t ondisk_lnk_cnt; 388 386 389 /** 387 /** 390 * Number of IN-MEMORY nscache_nodes referen 388 * Number of IN-MEMORY nscache_nodes referencing this FS node. 391 * 389 * 392 * Corresponds to the number of struct sos_f 390 * Corresponds to the number of struct sos_fs_nscache_node pointing 393 * to this node. This could be as much as on 391 * to this node. This could be as much as ondisk_lnk_cnt + 1, but is 394 * usually less 392 * usually less 395 * 393 * 396 * @note Reserved to fs.c 394 * @note Reserved to fs.c 397 */ 395 */ 398 sos_count_t inmem_ref_cnt; 396 sos_count_t inmem_ref_cnt; 399 397 400 /** 398 /** 401 * Directory, symlink, ... 399 * Directory, symlink, ... 402 * 400 * 403 * @see sos_fs_node_type_t 401 * @see sos_fs_node_type_t 404 * 402 * 405 * @note Publicly readable. Written only by 403 * @note Publicly readable. Written only by fs.c 406 */ 404 */ 407 sos_fs_node_type_t type; 405 sos_fs_node_type_t type; 408 406 409 #define SOS_FS_READABLE 00400 407 #define SOS_FS_READABLE 00400 410 #define SOS_FS_WRITABLE 00200 408 #define SOS_FS_WRITABLE 00200 411 #define SOS_FS_EXECUTABLE 00100 409 #define SOS_FS_EXECUTABLE 00100 412 /** 410 /** 413 * read/write, ... @see the SOS_FS_*ABLE fla 411 * read/write, ... @see the SOS_FS_*ABLE flags 414 * @note Publicly readable. Written only by 412 * @note Publicly readable. Written only by fs.c 415 */ 413 */ 416 sos_ui32_t access_rights; 414 sos_ui32_t access_rights; 417 415 418 /** 416 /** 419 * @note Reserved to fs.c 417 * @note Reserved to fs.c 420 */ 418 */ 421 sos_bool_t dirty; 419 sos_bool_t dirty; 422 420 423 /** 421 /** 424 * Incremented each time one of the opened f 422 * Incremented each time one of the opened files for this node is 425 * modified 423 * modified 426 * @note Publicly readable. Written only by 424 * @note Publicly readable. Written only by fs.c 427 */ 425 */ 428 sos_lcount_t generation; 426 sos_lcount_t generation; 429 427 430 /** 428 /** 431 * @note Available only for device files (ch 429 * @note Available only for device files (char/block) 432 * @note Publicly readable. Written only by 430 * @note Publicly readable. Written only by 433 * sos_fs_manager_instance::fetch_node_from_ 431 * sos_fs_manager_instance::fetch_node_from_disk() and mknod() 434 */ 432 */ 435 struct sos_fs_dev_id_t 433 struct sos_fs_dev_id_t 436 { 434 { 437 sos_ui32_t device_class; /**< aka "majo 435 sos_ui32_t device_class; /**< aka "major" */ 438 sos_ui32_t device_instance; /**< aka "mino 436 sos_ui32_t device_instance; /**< aka "minor" */ 439 } dev_id; 437 } dev_id; 440 438 441 /** Operations common to all node types */ 439 /** Operations common to all node types */ 442 struct sos_fs_node_ops_file *ops_file; 440 struct sos_fs_node_ops_file *ops_file; 443 441 444 /** Operations specific to some node types * 442 /** Operations specific to some node types */ 445 union 443 union 446 { 444 { 447 /** when type == SOS_FS_NODE_DIRECTORY */ 445 /** when type == SOS_FS_NODE_DIRECTORY */ 448 struct sos_fs_node_ops_dir *ops_dir; 446 struct sos_fs_node_ops_dir *ops_dir; 449 447 450 /** << 451 * when type == SOS_FS_NODE_DEVICE_BLOCK << 452 * The FS node has a link to some data per << 453 * not to any special operations << 454 * @see blkdev.c for a definition of this << 455 */ << 456 struct sos_blockdev_instance *block_device << 457 << 458 /** when type == SOS_FS_NODE_SYMLINK */ 448 /** when type == SOS_FS_NODE_SYMLINK */ 459 struct sos_fs_node_ops_symlink *ops_symli 449 struct sos_fs_node_ops_symlink *ops_symlink; 460 }; /* Anonymous union (gcc extension) */ 450 }; /* Anonymous union (gcc extension) */ 461 451 462 452 463 /** 453 /** >> 454 * Flush any change to disk >> 455 * >> 456 * @note Mandatory, may block. Appropriate locking MUST be implemented >> 457 */ >> 458 sos_ret_t (*sync)(struct sos_fs_node *this); >> 459 >> 460 >> 461 /** 464 * Simply free this FS node from the kernel 462 * Simply free this FS node from the kernel memory: it does NOT 465 * mean that the corresponding on-disk node 463 * mean that the corresponding on-disk node is free ! Actually, the 466 * corresponding ON-DISK node is free iff on 464 * corresponding ON-DISK node is free iff ondisk_lnk_cnt == 0. No 467 * need to sync anything to disk, as the VFS 465 * need to sync anything to disk, as the VFS will sync the node 468 * before calling this method 466 * before calling this method 469 * 467 * 470 * @note Mandatory, may block, no special lo 468 * @note Mandatory, may block, no special locking needed 471 */ 469 */ 472 sos_ret_t (*destructor)(struct sos_fs_node * 470 sos_ret_t (*destructor)(struct sos_fs_node * this); 473 471 474 /** 472 /** 475 * Called when a process opens the node 473 * Called when a process opens the node 476 * 474 * 477 * @note Mandatory, may block. Appropriate l 475 * @note Mandatory, may block. Appropriate locking MUST be implemented 478 * @note FS-specific EXCPET for device speci 476 * @note FS-specific EXCPET for device special files (char & 479 * block) because they are handled in an uni 477 * block) because they are handled in an uniform way by the 480 * chardev/blockdev subsystems 478 * chardev/blockdev subsystems 481 * @note As a consequence, FS code can safel 479 * @note As a consequence, FS code can safely assume that "this" is 482 * never a character or block device 480 * never a character or block device 483 */ 481 */ 484 sos_ret_t (*new_opened_file)(struct sos_fs_n 482 sos_ret_t (*new_opened_file)(struct sos_fs_node * this, 485 const struct so 483 const struct sos_process * owner, 486 sos_ui32_t open 484 sos_ui32_t open_flags, 487 struct sos_fs_o 485 struct sos_fs_opened_file ** result_of); 488 486 489 /** 487 /** 490 * Called when a process opens the node 488 * Called when a process opens the node 491 * 489 * 492 * @note Mandatory, may block. Appropriate l 490 * @note Mandatory, may block. Appropriate locking MUST be implemented 493 * @note FS-specific EXCEPT for device speci 491 * @note FS-specific EXCEPT for device special files (char & 494 * block) because they are handled in an uni 492 * block) because they are handled in an uniform way by the 495 * chardev/blockdev subsystems 493 * chardev/blockdev subsystems 496 * @note As a consequence, FS code can safel 494 * @note As a consequence, FS code can safely assume that "this" is 497 * never a character or block device 495 * never a character or block device 498 */ 496 */ 499 sos_ret_t (*close_opened_file)(struct sos_fs 497 sos_ret_t (*close_opened_file)(struct sos_fs_node * this, 500 struct sos_fs 498 struct sos_fs_opened_file * of); 501 499 502 /** 500 /** 503 * This should hold the meta information for 501 * This should hold the meta information for this node as needed by 504 * the FS instance. 502 * the FS instance. 505 */ 503 */ 506 void * custom_data; 504 void * custom_data; 507 505 508 /** Hash linkage entry for this FS node in t 506 /** Hash linkage entry for this FS node in the nodecache 509 dictionary */ 507 dictionary */ 510 struct sos_hash_linkage hlink_nodecache; 508 struct sos_hash_linkage hlink_nodecache; 511 509 512 /** Linkage to list the dirty nodes of the g 510 /** Linkage to list the dirty nodes of the given FS */ 513 struct sos_fs_node *prev_dirty, *next_dirty; 511 struct sos_fs_node *prev_dirty, *next_dirty; 514 }; 512 }; 515 513 516 514 517 515 518 /** 516 /** 519 * The list of methods implementing the basic 517 * The list of methods implementing the basic VFS operations on the 520 * given struct sos_fs_node 518 * given struct sos_fs_node 521 * 519 * 522 * @see sos_fs_node::ops_file 520 * @see sos_fs_node::ops_file 523 */ 521 */ 524 struct sos_fs_node_ops_file 522 struct sos_fs_node_ops_file 525 { 523 { 526 /** 524 /** 527 * Change size of file 525 * Change size of file 528 * 526 * 529 * @note Optional, may block. Appropriate lo 527 * @note Optional, may block. Appropriate locking MUST be implemented 530 */ 528 */ 531 sos_ret_t (*truncate)(struct sos_fs_node *th 529 sos_ret_t (*truncate)(struct sos_fs_node *this, 532 sos_lsoffset_t length) 530 sos_lsoffset_t length); 533 531 534 /** 532 /** 535 * Retrieve the status (eg size) of the file 533 * Retrieve the status (eg size) of the file 536 * 534 * 537 * @note Mandatory, may block. Appropriate l 535 * @note Mandatory, may block. Appropriate locking MUST be implemented 538 */ 536 */ 539 sos_ret_t (*stat)(struct sos_fs_node * this, 537 sos_ret_t (*stat)(struct sos_fs_node * this, 540 struct sos_fs_stat * resul 538 struct sos_fs_stat * result); 541 539 542 /** 540 /** 543 * Change the sos_fs_node::access_rights att 541 * Change the sos_fs_node::access_rights attribute 544 * 542 * 545 * @note Mandatory, may block. Appropriate l 543 * @note Mandatory, may block. Appropriate locking MUST be implemented 546 */ 544 */ 547 sos_ret_t (*chmod)(struct sos_fs_node * this 545 sos_ret_t (*chmod)(struct sos_fs_node * this, 548 sos_ui32_t new_access_rig 546 sos_ui32_t new_access_rights); 549 << 550 << 551 /** << 552 * Flush any change to the node back to the << 553 * << 554 * @note Mandatory, may block. Appropriate l << 555 */ << 556 sos_ret_t (*sync)(struct sos_fs_node *this); << 557 }; 547 }; 558 548 559 549 560 /** 550 /** 561 * The list of methods implementing the basic 551 * The list of methods implementing the basic VFS symlink operations 562 * 552 * 563 * @see sos_fs_node::ops_symlink 553 * @see sos_fs_node::ops_symlink 564 */ 554 */ 565 struct sos_fs_node_ops_symlink 555 struct sos_fs_node_ops_symlink 566 { 556 { 567 /** 557 /** 568 * Used by the _kernel_ to resolve the symli 558 * Used by the _kernel_ to resolve the symlinks. To change/create a 569 * symlink target, it is needed only from us 559 * symlink target, it is needed only from userland: the read/write 570 * methods are made for this 560 * methods are made for this 571 * 561 * 572 * @param target Pointer to the string repre 562 * @param target Pointer to the string representing the target's 573 * path, allocated for the fs_node's lifetim 563 * path, allocated for the fs_node's lifetime ! 574 * 564 * 575 * @note Mandatory, may block. Appropriate l 565 * @note Mandatory, may block. Appropriate locking MUST be implemented 576 */ 566 */ 577 sos_ret_t (*expand)(struct sos_fs_node *this 567 sos_ret_t (*expand)(struct sos_fs_node *this, 578 char const ** target, 568 char const ** target, 579 sos_size_t * target_len) 569 sos_size_t * target_len); 580 }; 570 }; 581 571 582 572 583 /** 573 /** 584 * The list of methods implementing the basic 574 * The list of methods implementing the basic VFS directory operations 585 * 575 * 586 * @see sos_fs_node::ops_dir 576 * @see sos_fs_node::ops_dir 587 */ 577 */ 588 struct sos_fs_node_ops_dir 578 struct sos_fs_node_ops_dir 589 { 579 { 590 /** 580 /** 591 * Look for the on-disk location of the sos_ 581 * Look for the on-disk location of the sos_fs_node having the given 592 * name 582 * name 593 * 583 * 594 * @note Mandatory, may block. Appropriate l 584 * @note Mandatory, may block. Appropriate locking MUST be implemented 595 */ 585 */ 596 sos_ret_t (*lookup)(struct sos_fs_node *this 586 sos_ret_t (*lookup)(struct sos_fs_node *this, 597 const char * name, sos_u 587 const char * name, sos_ui16_t namelen, 598 sos_ui64_t * result_stor 588 sos_ui64_t * result_storage_location); 599 589 600 /** 590 /** 601 * Add a new reference in the current sos_fs 591 * Add a new reference in the current sos_fs_node to the on-disk 602 * location of the given sos_fs_node 592 * location of the given sos_fs_node 603 * 593 * 604 * @note Responsible for updating this->ondi 594 * @note Responsible for updating this->ondisk_lnk_cnt 605 * @note Mandatory for writable directories, 595 * @note Mandatory for writable directories, may block. Appropriate 606 * locking MUST be implemented 596 * locking MUST be implemented 607 */ 597 */ 608 sos_ret_t (*link)(struct sos_fs_node *this, 598 sos_ret_t (*link)(struct sos_fs_node *this, 609 const struct sos_process * 599 const struct sos_process *actor, 610 const char * entry_name, s 600 const char * entry_name, sos_ui16_t entry_namelen, 611 struct sos_fs_node * node) 601 struct sos_fs_node * node); 612 602 613 /** 603 /** 614 * Remove the entry in the current sos_fs_no 604 * Remove the entry in the current sos_fs_node for the on-disk 615 * location with the given name 605 * location with the given name 616 * 606 * 617 * @note Responsible for updating this->ondi 607 * @note Responsible for updating this->ondisk_lnk_cnt 618 * @note Mandatory for writable directories, 608 * @note Mandatory for writable directories, may block. Appropriate 619 * locking MUST be implemented 609 * locking MUST be implemented 620 */ 610 */ 621 sos_ret_t (*unlink)(struct sos_fs_node *this 611 sos_ret_t (*unlink)(struct sos_fs_node *this, 622 const struct sos_process 612 const struct sos_process *actor, 623 const char * entry_name, 613 const char * entry_name, sos_ui16_t entry_namelen); 624 }; 614 }; 625 615 626 616 627 /** 617 /** 628 * The data structure holding information and 618 * The data structure holding information and method related to a 629 * particular usage of a file. A so-called "st 619 * particular usage of a file. A so-called "struct file" 630 * 620 * 631 * This represents the kernel structure behind 621 * This represents the kernel structure behind a "file descriptor" or 632 * behind a chdir/chroot. Among other things, 622 * behind a chdir/chroot. Among other things, it holds the methods 633 * responsible for reading/writing into the fi 623 * responsible for reading/writing into the file, and for moving the 634 * file pointer (see @sos_fs_opened_file::posi 624 * file pointer (see @sos_fs_opened_file::position) inside it. 635 */ 625 */ 636 struct sos_fs_opened_file 626 struct sos_fs_opened_file 637 { 627 { 638 /** The process that opened the file/dir */ 628 /** The process that opened the file/dir */ 639 const struct sos_process * owner; 629 const struct sos_process * owner; 640 630 641 /** 631 /** 642 * The reference to the sos_fs_nscache_node 632 * The reference to the sos_fs_nscache_node and, hence, to the underlying sos_fs_node. 643 * 633 * 644 * Used to cache the in-memory fs nodes 634 * Used to cache the in-memory fs nodes 645 */ 635 */ 646 struct sos_fs_nscache_node * direntry; 636 struct sos_fs_nscache_node * direntry; 647 637 648 /** Use for memory-management */ 638 /** Use for memory-management */ 649 sos_count_t ref_cnt; 639 sos_count_t ref_cnt; 650 640 651 /** 641 /** 652 * Always > 0 (ie max size = 2^63-1 = 9.2 10 642 * Always > 0 (ie max size = 2^63-1 = 9.2 10^18). We make it 653 * "signed" here to limit its range. Because 643 * "signed" here to limit its range. Because we must be able to 654 * seek to the begining of the file with SEE 644 * seek to the begining of the file with SEEK_END and a negative 655 * offset, so the max size of the file must 645 * offset, so the max size of the file must be reachable by a lseek 656 * offset 646 * offset 657 * 647 * 658 * @note reserved to filesystem instance cod 648 * @note reserved to filesystem instance code. Not modified nor used 659 * by fs.c 649 * by fs.c 660 */ 650 */ 661 sos_lsoffset_t position; 651 sos_lsoffset_t position; 662 652 663 /** 653 /** 664 * Incremented each time this opened file is 654 * Incremented each time this opened file is modified 665 * 655 * 666 * Used to implement a readdir method resili 656 * Used to implement a readdir method resilient to 667 * creat/mkdir/rmdir/unlink 657 * creat/mkdir/rmdir/unlink 668 */ 658 */ 669 sos_lcount_t generation; 659 sos_lcount_t generation; 670 660 671 /** 661 /** 672 * @see SOS_FS_OPEN_* flags 662 * @see SOS_FS_OPEN_* flags 673 */ 663 */ 674 sos_ui32_t open_flags; 664 sos_ui32_t open_flags; 675 665 676 /** Operations common to all node types */ 666 /** Operations common to all node types */ 677 struct sos_fs_ops_opened_file * ops_file; 667 struct sos_fs_ops_opened_file * ops_file; 678 668 679 /** Operations specific to some node types * 669 /** Operations specific to some node types */ 680 union 670 union 681 { 671 { 682 /** when direntry->fs_node->type == SOS_FS 672 /** when direntry->fs_node->type == SOS_FS_NODE_DIRECTORY */ 683 struct sos_fs_ops_opened_dir * ops_di 673 struct sos_fs_ops_opened_dir * ops_dir; 684 674 685 /** when direntry->fs_node->type == SOS_FS 675 /** when direntry->fs_node->type == SOS_FS_NODE_DEVICE_CHAR */ 686 struct sos_fs_ops_opened_chardev * ops_ch 676 struct sos_fs_ops_opened_chardev * ops_chardev; 687 << 688 /** when direntry->fs_node->type == SOS_FS << 689 struct sos_fs_ops_opened_blockdev * ops_bl << 690 }; /* Anonymous union (gcc extension) */ 677 }; /* Anonymous union (gcc extension) */ 691 678 692 /** 679 /** 693 * Called upon fork() to duplicate all the o 680 * Called upon fork() to duplicate all the opened files 694 * 681 * 695 * @note FS-specific EXCEPT for device speci 682 * @note FS-specific EXCEPT for device special files (char & 696 * block) because they are handled in an uni 683 * block) because they are handled in an uniform way by the 697 * chardev/blockdev subsystems 684 * chardev/blockdev subsystems 698 * @note As a consequence, FS code can safel 685 * @note As a consequence, FS code can safely assume that "this" is 699 * never a character or block device 686 * never a character or block device 700 */ 687 */ 701 sos_ret_t (*duplicate)(struct sos_fs_opened_ 688 sos_ret_t (*duplicate)(struct sos_fs_opened_file *this, 702 const struct sos_proc 689 const struct sos_process * for_owner, 703 struct sos_fs_opened_ 690 struct sos_fs_opened_file **result); 704 691 705 void * custom_data; 692 void * custom_data; 706 }; 693 }; 707 694 708 695 709 /** 696 /** 710 * Reference position for sos_fs_seek 697 * Reference position for sos_fs_seek 711 */ 698 */ 712 typedef enum { SOS_SEEK_SET=42, 699 typedef enum { SOS_SEEK_SET=42, 713 SOS_SEEK_CUR=24, 700 SOS_SEEK_CUR=24, 714 SOS_SEEK_END=84 } sos_seek_when 701 SOS_SEEK_END=84 } sos_seek_whence_t; 715 /** 702 /** 716 * The list of methods implementing the basic 703 * The list of methods implementing the basic VFS opened file 717 * operations 704 * operations 718 * 705 * 719 * See the Unix manual pages, they basically f 706 * See the Unix manual pages, they basically form the interfaces to to 720 * these functions 707 * these functions 721 * 708 * 722 * @see sos_fs_opened_file::ops_file 709 * @see sos_fs_opened_file::ops_file 723 */ 710 */ 724 struct sos_fs_ops_opened_file 711 struct sos_fs_ops_opened_file 725 { 712 { 726 /** 713 /** 727 * @note Mandatory, may block. Appropriate l 714 * @note Mandatory, may block. Appropriate locking MUST be implemented 728 * @note Please call sos_fs_mark_dirty() if 715 * @note Please call sos_fs_mark_dirty() if disk contents is changed 729 */ 716 */ 730 sos_ret_t (*seek)(struct sos_fs_opened_file 717 sos_ret_t (*seek)(struct sos_fs_opened_file *this, 731 sos_lsoffset_t offset, 718 sos_lsoffset_t offset, 732 sos_seek_whence_t whence, 719 sos_seek_whence_t whence, 733 /* out */ sos_lsoffset_t * 720 /* out */ sos_lsoffset_t * result_position); 734 721 735 /** 722 /** 736 * @note Mandatory, may block. Appropriate l 723 * @note Mandatory, may block. Appropriate locking MUST be implemented 737 * @note Please call sos_fs_mark_dirty() if 724 * @note Please call sos_fs_mark_dirty() if disk contents is changed 738 */ 725 */ 739 sos_ret_t (*read)(struct sos_fs_opened_file 726 sos_ret_t (*read)(struct sos_fs_opened_file *this, 740 sos_uaddr_t dest_buf, 727 sos_uaddr_t dest_buf, 741 sos_size_t * /* in/out */l 728 sos_size_t * /* in/out */len); 742 729 743 /** 730 /** 744 * @note Optional (might be NULL), may block 731 * @note Optional (might be NULL), may block. Appropriate locking 745 * MUST be implemented 732 * MUST be implemented 746 * @note Please call sos_fs_mark_dirty() if 733 * @note Please call sos_fs_mark_dirty() if disk contents is changed 747 */ 734 */ 748 sos_ret_t (*write)(struct sos_fs_opened_file 735 sos_ret_t (*write)(struct sos_fs_opened_file *this, 749 sos_uaddr_t src_buf, 736 sos_uaddr_t src_buf, 750 sos_size_t * /* in/out */ 737 sos_size_t * /* in/out */len); 751 738 752 /** 739 /** 753 * @note Optional (might be NULL), may block 740 * @note Optional (might be NULL), may block. Appropriate locking 754 * MUST be implemented 741 * MUST be implemented 755 * @note Please call sos_fs_mark_dirty() if 742 * @note Please call sos_fs_mark_dirty() if disk contents is changed 756 */ 743 */ 757 sos_ret_t (*mmap)(struct sos_fs_opened_file 744 sos_ret_t (*mmap)(struct sos_fs_opened_file *this, 758 sos_uaddr_t *uaddr, sos_si 745 sos_uaddr_t *uaddr, sos_size_t size, 759 sos_ui32_t access_rights, 746 sos_ui32_t access_rights, 760 sos_ui32_t flags, 747 sos_ui32_t flags, 761 sos_luoffset_t offset); 748 sos_luoffset_t offset); 762 749 763 /** 750 /** 764 * @note Optional (might be NULL), may block 751 * @note Optional (might be NULL), may block. Appropriate locking 765 * MUST be implemented 752 * MUST be implemented 766 * @note Please call sos_fs_mark_dirty() if 753 * @note Please call sos_fs_mark_dirty() if disk contents is changed 767 */ 754 */ 768 sos_ret_t (*fcntl)(struct sos_fs_opened_file 755 sos_ret_t (*fcntl)(struct sos_fs_opened_file *this, 769 int req_id, 756 int req_id, 770 sos_ui32_t req_arg /* Usu 757 sos_ui32_t req_arg /* Usually: sos_uaddr_t */); 771 }; 758 }; 772 759 773 760 774 /** 761 /** 775 * The list of methods implementing the basic 762 * The list of methods implementing the basic VFS opened character device 776 * operations 763 * operations 777 * 764 * 778 * @see sos_fs_opened_file::ops_file 765 * @see sos_fs_opened_file::ops_file 779 */ 766 */ 780 struct sos_fs_ops_opened_chardev 767 struct sos_fs_ops_opened_chardev 781 { 768 { 782 /** 769 /** 783 * @note Optional (might be NULL), may block 770 * @note Optional (might be NULL), may block. Appropriate locking 784 * MUST be implemented 771 * MUST be implemented 785 * @note Please call sos_fs_mark_dirty() if 772 * @note Please call sos_fs_mark_dirty() if disk contents is changed 786 */ 773 */ 787 sos_ret_t (*ioctl)(struct sos_fs_opened_file 774 sos_ret_t (*ioctl)(struct sos_fs_opened_file *this, 788 int req_id, 775 int req_id, 789 sos_ui32_t req_arg /* Usu 776 sos_ui32_t req_arg /* Usually: sos_uaddr_t */); 790 }; 777 }; 791 778 792 779 793 /** << 794 * The list of methods implementing the basic << 795 * operations << 796 * << 797 * @see sos_fs_opened_file::ops_file << 798 */ << 799 struct sos_fs_ops_opened_blockdev << 800 { << 801 /** << 802 * @note Optional (might be NULL), may block << 803 * MUST be implemented << 804 * @note Please call sos_fs_mark_dirty() if << 805 */ << 806 sos_ret_t (*ioctl)(struct sos_fs_opened_file << 807 int req_id, << 808 sos_ui32_t req_arg /* Usu << 809 }; << 810 << 811 << 812 /** Data structure that is to be filled by rea 780 /** Data structure that is to be filled by readdir */ 813 struct sos_fs_dirent 781 struct sos_fs_dirent 814 { 782 { 815 sos_ui64_t storage_location; 783 sos_ui64_t storage_location; 816 sos_si64_t offset_in_dirfile; 784 sos_si64_t offset_in_dirfile; 817 sos_ui32_t type; 785 sos_ui32_t type; 818 sos_ui16_t namelen; 786 sos_ui16_t namelen; 819 787 820 #define SOS_FS_DIRENT_NAME_MAXLEN 128 788 #define SOS_FS_DIRENT_NAME_MAXLEN 128 821 char name[SOS_FS_DIRENT_NAME_MAXLEN]; 789 char name[SOS_FS_DIRENT_NAME_MAXLEN]; 822 }; 790 }; 823 791 824 792 825 /** 793 /** 826 * The list of methods implementing the basic 794 * The list of methods implementing the basic VFS opened directory 827 * operations 795 * operations 828 * 796 * 829 * @see sos_fs_opened_file::ops_file 797 * @see sos_fs_opened_file::ops_file 830 */ 798 */ 831 struct sos_fs_ops_opened_dir 799 struct sos_fs_ops_opened_dir 832 { 800 { 833 /** 801 /** 834 * Each time it is called, responsible for f 802 * Each time it is called, responsible for filling the sos_fs_dirent 835 * structure, return -SOS_ENOENT when done. 803 * structure, return -SOS_ENOENT when done. 836 * 804 * 837 * @note Mandatory, may block. Appropriate l 805 * @note Mandatory, may block. Appropriate locking MUST be implemented 838 * @note Please call sos_fs_mark_dirty() if 806 * @note Please call sos_fs_mark_dirty() if disk contents is changed 839 */ 807 */ 840 sos_ret_t (*readdir)(struct sos_fs_opened_fi 808 sos_ret_t (*readdir)(struct sos_fs_opened_file *this, 841 struct sos_fs_dirent * 809 struct sos_fs_dirent * result); 842 }; 810 }; 843 811 844 812 845 813 846 /** 814 /** 847 * Used by the stat calls 815 * Used by the stat calls 848 * 816 * 849 * @see sos_fs_node_ops_file::stat 817 * @see sos_fs_node_ops_file::stat 850 */ 818 */ 851 struct sos_fs_stat 819 struct sos_fs_stat 852 { 820 { 853 struct sos_fs_dev_id_t st_rdev; 821 struct sos_fs_dev_id_t st_rdev; 854 sos_fs_node_type_t st_type; 822 sos_fs_node_type_t st_type; 855 sos_ui64_t st_storage_location; 823 sos_ui64_t st_storage_location; 856 sos_ui32_t st_access_rights; 824 sos_ui32_t st_access_rights; 857 sos_count_t st_nlink; 825 sos_count_t st_nlink; 858 sos_si64_t st_size; 826 sos_si64_t st_size; 859 }; 827 }; 860 828 861 829 862 /** 830 /** 863 * Used by the statvfs calls 831 * Used by the statvfs calls 864 * 832 * 865 * @see sos_fs_manager_instance::statfs 833 * @see sos_fs_manager_instance::statfs 866 */ 834 */ 867 struct sos_fs_statfs 835 struct sos_fs_statfs 868 { 836 { 869 struct sos_fs_dev_id_t f_rdev; 837 struct sos_fs_dev_id_t f_rdev; 870 sos_size_t f_sz_total; /**< Tot 838 sos_size_t f_sz_total; /**< Total size */ 871 sos_size_t f_sz_free; /**< Siz 839 sos_size_t f_sz_free; /**< Size left on device */ 872 sos_count_t f_node_total;/**< Tot 840 sos_count_t f_node_total;/**< Total allocatable FS nodes */ 873 sos_count_t f_node_avail;/**< Num 841 sos_count_t f_node_avail;/**< Number of available free FS nodes */ 874 sos_ui32_t f_flags; 842 sos_ui32_t f_flags; 875 }; 843 }; 876 844 877 845 878 /** 846 /** 879 * Must be called AFTER the FS manager types n 847 * Must be called AFTER the FS manager types needed to mount the root 880 * filesystem have been registered 848 * filesystem have been registered 881 */ 849 */ 882 sos_ret_t sos_fs_subsystem_setup(const char * 850 sos_ret_t sos_fs_subsystem_setup(const char * root_device, 883 const char * 851 const char * fs_type, 884 const char * 852 const char * mount_args, 885 struct sos_fs 853 struct sos_fs_manager_instance ** result_rootfs); 886 854 887 855 888 /* ****************************************** 856 /* *************************************************************** 889 * The Following functions are relatively stan 857 * The Following functions are relatively standard 890 * 858 * 891 * @see Unix manual pages for details 859 * @see Unix manual pages for details 892 */ 860 */ 893 861 894 862 895 /** 863 /** 896 * mount a file system 864 * mount a file system 897 * 865 * 898 * @param actor process calling mount 866 * @param actor process calling mount 899 * @param _src_path(len) may be NULL (as for v 867 * @param _src_path(len) may be NULL (as for virtfs or /proc) 900 * @fsname the name of the filesystem type to 868 * @fsname the name of the filesystem type to mount 901 * @args any args passed to the sos_fs_manager 869 * @args any args passed to the sos_fs_manager_type::mount method 902 * @result_fs the resulting filesystem instanc 870 * @result_fs the resulting filesystem instance 903 */ 871 */ 904 sos_ret_t sos_fs_mount(struct sos_process * ac 872 sos_ret_t sos_fs_mount(struct sos_process * actor, 905 const char * _src_path, 873 const char * _src_path, 906 sos_size_t _src_pathlen 874 sos_size_t _src_pathlen, 907 const char * _dst_path, 875 const char * _dst_path, 908 sos_size_t _dst_pathlen 876 sos_size_t _dst_pathlen, 909 const char * fsname, 877 const char * fsname, 910 sos_ui32_t mountflags, 878 sos_ui32_t mountflags, 911 const char * args, 879 const char * args, 912 struct sos_fs_manager_i 880 struct sos_fs_manager_instance ** /*out*/result_fs); 913 881 914 /** 882 /** 915 * unmount the filesystem at the given locatio 883 * unmount the filesystem at the given location 916 */ 884 */ 917 sos_ret_t sos_fs_umount(struct sos_process * a 885 sos_ret_t sos_fs_umount(struct sos_process * actor, 918 const char * _mountpoi 886 const char * _mountpoint_path, 919 sos_size_t _mountpoint 887 sos_size_t _mountpoint_pathlen); 920 888 921 /** 889 /** 922 * Flush all the dirty nodes of all the FS to 890 * Flush all the dirty nodes of all the FS to disk 923 */ 891 */ 924 sos_ret_t sos_fs_sync_all_fs(void); !! 892 sos_ret_t sos_fs_sync_all_fs(); 925 893 926 /** 894 /** 927 * Retrieve filesystem status, or return -SOS_ 895 * Retrieve filesystem status, or return -SOS_ENOSYS if filesystem 928 * cannot report this 896 * cannot report this 929 */ 897 */ 930 sos_ret_t sos_fs_vfstat(const struct sos_proce 898 sos_ret_t sos_fs_vfstat(const struct sos_process * actor, 931 const char * _path, 899 const char * _path, 932 sos_size_t _pathlen, 900 sos_size_t _pathlen, 933 struct sos_fs_statfs * 901 struct sos_fs_statfs * result); 934 902 935 /** 903 /** 936 * Open flags 904 * Open flags 937 */ 905 */ 938 #define SOS_FS_OPEN_EXCL (1 << 0) 906 #define SOS_FS_OPEN_EXCL (1 << 0) 939 #define SOS_FS_OPEN_CREAT (1 << 1) 907 #define SOS_FS_OPEN_CREAT (1 << 1) 940 #define SOS_FS_OPEN_TRUNC (1 << 2) 908 #define SOS_FS_OPEN_TRUNC (1 << 2) 941 #define SOS_FS_OPEN_NOFOLLOW (1 << 3) 909 #define SOS_FS_OPEN_NOFOLLOW (1 << 3) 942 #define SOS_FS_OPEN_DIRECTORY (1 << 4) /* In 910 #define SOS_FS_OPEN_DIRECTORY (1 << 4) /* Incompatible with CREAT/TRUNC */ 943 #define SOS_FS_OPEN_SYNC (1 << 5) 911 #define SOS_FS_OPEN_SYNC (1 << 5) 944 #define SOS_FS_OPEN_CLOSEONEXEC (1 << 6) /* By 912 #define SOS_FS_OPEN_CLOSEONEXEC (1 << 6) /* By default, files are kept 945 op 913 open upon an exec() */ 946 914 947 #define SOS_FS_OPEN_READ (1 << 16) 915 #define SOS_FS_OPEN_READ (1 << 16) 948 #define SOS_FS_OPEN_WRITE (1 << 17) 916 #define SOS_FS_OPEN_WRITE (1 << 17) 949 917 950 918 951 /** 919 /** 952 * FS access rights 920 * FS access rights 953 */ 921 */ 954 #define SOS_FS_S_IRUSR 00400 922 #define SOS_FS_S_IRUSR 00400 955 #define SOS_FS_S_IWUSR 00200 923 #define SOS_FS_S_IWUSR 00200 956 #define SOS_FS_S_IXUSR 00100 924 #define SOS_FS_S_IXUSR 00100 957 925 958 #define SOS_FS_S_IRWXALL 07777 /* For symlinks 926 #define SOS_FS_S_IRWXALL 07777 /* For symlinks */ 959 927 960 sos_ret_t sos_fs_open(const struct sos_process 928 sos_ret_t sos_fs_open(const struct sos_process *owner, 961 const char *_path, 929 const char *_path, 962 sos_size_t _pathlen, 930 sos_size_t _pathlen, 963 sos_ui32_t open_flags, 931 sos_ui32_t open_flags, 964 sos_ui32_t creat_access_ 932 sos_ui32_t creat_access_rights, 965 struct sos_fs_opened_fil 933 struct sos_fs_opened_file ** of); 966 934 967 sos_ret_t sos_fs_close(struct sos_fs_opened_fi 935 sos_ret_t sos_fs_close(struct sos_fs_opened_file * of); 968 936 969 sos_ret_t sos_fs_read(struct sos_fs_opened_fil 937 sos_ret_t sos_fs_read(struct sos_fs_opened_file * of, 970 sos_uaddr_t dest_buf, 938 sos_uaddr_t dest_buf, 971 sos_size_t * /* in/ou */ 939 sos_size_t * /* in/ou */len); 972 940 973 sos_ret_t sos_fs_readdir(struct sos_fs_opened_ 941 sos_ret_t sos_fs_readdir(struct sos_fs_opened_file * of, 974 struct sos_fs_dirent 942 struct sos_fs_dirent * result); 975 943 976 sos_ret_t sos_fs_write(struct sos_fs_opened_fi 944 sos_ret_t sos_fs_write(struct sos_fs_opened_file * of, 977 sos_uaddr_t src_buf, 945 sos_uaddr_t src_buf, 978 sos_size_t * /* in/out 946 sos_size_t * /* in/out */len); 979 947 980 sos_ret_t sos_fs_seek(struct sos_fs_opened_fil 948 sos_ret_t sos_fs_seek(struct sos_fs_opened_file *of, 981 sos_lsoffset_t offset, 949 sos_lsoffset_t offset, 982 sos_seek_whence_t whence 950 sos_seek_whence_t whence, 983 sos_lsoffset_t * result_ 951 sos_lsoffset_t * result_position); 984 952 985 sos_ret_t sos_fs_ftruncate(struct sos_fs_opene 953 sos_ret_t sos_fs_ftruncate(struct sos_fs_opened_file *of, 986 sos_lsoffset_t leng 954 sos_lsoffset_t length); 987 955 988 sos_ret_t sos_fs_mmap(struct sos_fs_opened_fil 956 sos_ret_t sos_fs_mmap(struct sos_fs_opened_file *of, 989 sos_uaddr_t *uaddr, sos_ 957 sos_uaddr_t *uaddr, sos_size_t size, 990 sos_ui32_t access_rights 958 sos_ui32_t access_rights, 991 sos_ui32_t flags, 959 sos_ui32_t flags, 992 sos_luoffset_t offset); 960 sos_luoffset_t offset); 993 961 994 sos_ret_t sos_fs_fsync(struct sos_fs_opened_fi 962 sos_ret_t sos_fs_fsync(struct sos_fs_opened_file * of); 995 963 996 sos_ret_t sos_fs_fcntl(struct sos_fs_opened_fi 964 sos_ret_t sos_fs_fcntl(struct sos_fs_opened_file *of, 997 int req_id, 965 int req_id, 998 sos_ui32_t req_arg /* U 966 sos_ui32_t req_arg /* Usually: sos_uaddr_t */); 999 967 1000 sos_ret_t sos_fs_ioctl(struct sos_fs_opened_f 968 sos_ret_t sos_fs_ioctl(struct sos_fs_opened_file *of, 1001 int req_id, 969 int req_id, 1002 sos_ui32_t req_arg /* 970 sos_ui32_t req_arg /* Usually: sos_uaddr_t */); 1003 971 1004 sos_ret_t sos_fs_creat(const struct sos_proce 972 sos_ret_t sos_fs_creat(const struct sos_process * creator, 1005 const char * _path, 973 const char * _path, 1006 sos_size_t _pathlen, 974 sos_size_t _pathlen, 1007 sos_ui32_t access_righ 975 sos_ui32_t access_rights); 1008 976 1009 sos_ret_t sos_fs_link(const struct sos_proces 977 sos_ret_t sos_fs_link(const struct sos_process * creator, 1010 const char * _old_path, 978 const char * _old_path, 1011 sos_size_t _old_pathlen 979 sos_size_t _old_pathlen, 1012 const char * _dest_path 980 const char * _dest_path, 1013 sos_size_t _dest_pathle 981 sos_size_t _dest_pathlen); 1014 982 1015 sos_ret_t sos_fs_rename(const struct sos_proc 983 sos_ret_t sos_fs_rename(const struct sos_process * creator, 1016 const char * _old_pat 984 const char * _old_path, 1017 sos_size_t _old_pathl 985 sos_size_t _old_pathlen, 1018 const char * _dest_pa 986 const char * _dest_path, 1019 sos_size_t _dest_path 987 sos_size_t _dest_pathlen); 1020 988 1021 sos_ret_t sos_fs_unlink(const struct sos_proc 989 sos_ret_t sos_fs_unlink(const struct sos_process * actor, 1022 const char * _path, 990 const char * _path, 1023 sos_size_t _pathlen); 991 sos_size_t _pathlen); 1024 992 1025 sos_ret_t sos_fs_symlink(const struct sos_pro 993 sos_ret_t sos_fs_symlink(const struct sos_process * creator, 1026 const char * _path, 994 const char * _path, 1027 sos_size_t _pathlen, 995 sos_size_t _pathlen, 1028 sos_uaddr_t symlink_ 996 sos_uaddr_t symlink_target, 1029 sos_size_t symlink_t 997 sos_size_t symlink_target_len); 1030 998 1031 sos_ret_t sos_fs_mknod(const struct sos_proce 999 sos_ret_t sos_fs_mknod(const struct sos_process * creator, 1032 const char * _path, 1000 const char * _path, 1033 sos_size_t _pathlen, 1001 sos_size_t _pathlen, 1034 sos_fs_node_type_t typ 1002 sos_fs_node_type_t type /* only block/char allowed */, 1035 sos_ui32_t access_righ 1003 sos_ui32_t access_rights, 1036 const struct sos_fs_de 1004 const struct sos_fs_dev_id_t * devid); 1037 1005 1038 sos_ret_t sos_fs_mkdir(const struct sos_proce 1006 sos_ret_t sos_fs_mkdir(const struct sos_process * creator, 1039 const char * _path, 1007 const char * _path, 1040 sos_size_t _pathlen, 1008 sos_size_t _pathlen, 1041 sos_ui32_t access_righ 1009 sos_ui32_t access_rights); 1042 1010 1043 sos_ret_t sos_fs_rmdir(const struct sos_proce 1011 sos_ret_t sos_fs_rmdir(const struct sos_process * actor, 1044 const char * _path, 1012 const char * _path, 1045 sos_size_t _pathlen); 1013 sos_size_t _pathlen); 1046 1014 1047 sos_ret_t sos_fs_chmod(const struct sos_proce 1015 sos_ret_t sos_fs_chmod(const struct sos_process * actor, 1048 const char * _path, 1016 const char * _path, 1049 sos_size_t _pathlen, 1017 sos_size_t _pathlen, 1050 sos_ui32_t access_righ 1018 sos_ui32_t access_rights); 1051 1019 1052 sos_ret_t sos_fs_stat(const struct sos_proces 1020 sos_ret_t sos_fs_stat(const struct sos_process * actor, 1053 const char * _path, 1021 const char * _path, 1054 sos_size_t _pathlen, 1022 sos_size_t _pathlen, 1055 int nofollow, 1023 int nofollow, 1056 struct sos_fs_stat * re 1024 struct sos_fs_stat * result); 1057 1025 1058 1026 1059 /* ****************************************** 1027 /* *************************************************************** 1060 * Restricted functions reserved to FS code a 1028 * Restricted functions reserved to FS code and block/char devices 1061 */ 1029 */ 1062 1030 1063 /** 1031 /** 1064 * Function to be called when proposing a new 1032 * Function to be called when proposing a new File system type 1065 */ 1033 */ 1066 sos_ret_t sos_fs_register_fs_type(struct sos_ 1034 sos_ret_t sos_fs_register_fs_type(struct sos_fs_manager_type * fstype); 1067 sos_ret_t sos_fs_unregister_fs_type(struct so 1035 sos_ret_t sos_fs_unregister_fs_type(struct sos_fs_manager_type * fstype); 1068 1036 1069 /** 1037 /** 1070 * Marthe given file as dirty, for FS support 1038 * Marthe given file as dirty, for FS supporting deferred write access 1071 * mode 1039 * mode 1072 */ 1040 */ 1073 sos_ret_t sos_fs_mark_dirty(struct sos_fs_ope 1041 sos_ret_t sos_fs_mark_dirty(struct sos_fs_opened_file * of); 1074 1042 1075 /** 1043 /** 1076 * Helper function to be called from the moun 1044 * Helper function to be called from the mount() method of the FS 1077 * instance code. Responsible for creating an 1045 * instance code. Responsible for creating and updating the "root" 1078 * field of the FS instance structure and for 1046 * field of the FS instance structure and for connecting this FS in 1079 * the nscache 1047 * the nscache 1080 * @param root_fsnode The root of the FS bein 1048 * @param root_fsnode The root of the FS being mounted 1081 */ 1049 */ 1082 sos_ret_t sos_fs_register_fs_instance(struct 1050 sos_ret_t sos_fs_register_fs_instance(struct sos_fs_manager_instance * fs, 1083 struct 1051 struct sos_fs_node * root_fsnode); 1084 1052 1085 /** 1053 /** 1086 * Helper function to be called from the umou 1054 * Helper function to be called from the umount() method of the FS 1087 * instance code. Responsible for unregisteri 1055 * instance code. Responsible for unregistering the instance from the 1088 * FS type's instances list and for disconnec 1056 * FS type's instances list and for disconnecting this mountpoint in 1089 * the nscache. 1057 * the nscache. 1090 */ 1058 */ 1091 sos_ret_t sos_fs_unregister_fs_instance(struc 1059 sos_ret_t sos_fs_unregister_fs_instance(struct sos_fs_manager_instance * fs); 1092 1060 1093 1061 1094 /* ****************************************** 1062 /* *************************************************************** 1095 * Restricted functions reserved to syscall.c 1063 * Restricted functions reserved to syscall.c 1096 */ 1064 */ 1097 sos_ret_t sos_fs_ref_opened_file(struct sos_f 1065 sos_ret_t sos_fs_ref_opened_file(struct sos_fs_opened_file * of); 1098 sos_ret_t _sos_fs_unref_opened_file(struct so 1066 sos_ret_t _sos_fs_unref_opened_file(struct sos_fs_opened_file ** of); 1099 #define sos_fs_unref_opened_file(f) _sos_fs_u 1067 #define sos_fs_unref_opened_file(f) _sos_fs_unref_opened_file(&(f)) 1100 1068 1101 1069 1102 /* ****************************************** 1070 /* *************************************************************** 1103 * Restricted functions to be used only by fs 1071 * Restricted functions to be used only by fs_nscache.c 1104 */ 1072 */ 1105 1073 1106 sos_ret_t sos_fs_ref_fsnode(struct sos_fs_nod 1074 sos_ret_t sos_fs_ref_fsnode(struct sos_fs_node * fsnode); 1107 1075 1108 sos_ret_t _sos_fs_unref_fsnode(struct sos_fs_ 1076 sos_ret_t _sos_fs_unref_fsnode(struct sos_fs_node * fsnode); 1109 #define sos_fs_unref_fsnode(n) \ 1077 #define sos_fs_unref_fsnode(n) \ 1110 ({ sos_ret_t __retval = _sos_fs_unref_fsnod 1078 ({ sos_ret_t __retval = _sos_fs_unref_fsnode(n); (n)=NULL; __retval; }) 1111 1079 1112 1080 1113 /* ****************************************** 1081 /* *************************************************************** 1114 * Restricted functions reserved to process.c 1082 * Restricted functions reserved to process.c and main.c:start_init() 1115 */ 1083 */ 1116 sos_ret_t sos_fs_new_opened_file(const struct 1084 sos_ret_t sos_fs_new_opened_file(const struct sos_process * proc, 1117 struct sos_f 1085 struct sos_fs_nscache_node * nsnode, 1118 sos_ui32_t o 1086 sos_ui32_t open_flags, 1119 struct sos_f 1087 struct sos_fs_opened_file ** result_of); 1120 1088 1121 1089 1122 sos_ret_t sos_fs_duplicate_opened_file(struct 1090 sos_ret_t sos_fs_duplicate_opened_file(struct sos_fs_opened_file * src_of, 1123 const 1091 const struct sos_process * dst_proc, 1124 struct 1092 struct sos_fs_opened_file ** result_of); 1125 1093 1126 1094 1127 1095 1128 #endif /* _SOS_FS_H_ */ 1096 #endif /* _SOS_FS_H_ */
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