1 #ifndef QEMU_9P_H 2 #define QEMU_9P_H 3 4 #include <dirent.h> 5 #include <utime.h> 6 #include <sys/resource.h> 7 #include "fsdev/file-op-9p.h" 8 #include "fsdev/9p-iov-marshal.h" 9 #include "qemu/thread.h" 10 #include "qemu/coroutine.h" 11 12 enum { 13 P9_TLERROR = 6, 14 P9_RLERROR, 15 P9_TSTATFS = 8, 16 P9_RSTATFS, 17 P9_TLOPEN = 12, 18 P9_RLOPEN, 19 P9_TLCREATE = 14, 20 P9_RLCREATE, 21 P9_TSYMLINK = 16, 22 P9_RSYMLINK, 23 P9_TMKNOD = 18, 24 P9_RMKNOD, 25 P9_TRENAME = 20, 26 P9_RRENAME, 27 P9_TREADLINK = 22, 28 P9_RREADLINK, 29 P9_TGETATTR = 24, 30 P9_RGETATTR, 31 P9_TSETATTR = 26, 32 P9_RSETATTR, 33 P9_TXATTRWALK = 30, 34 P9_RXATTRWALK, 35 P9_TXATTRCREATE = 32, 36 P9_RXATTRCREATE, 37 P9_TREADDIR = 40, 38 P9_RREADDIR, 39 P9_TFSYNC = 50, 40 P9_RFSYNC, 41 P9_TLOCK = 52, 42 P9_RLOCK, 43 P9_TGETLOCK = 54, 44 P9_RGETLOCK, 45 P9_TLINK = 70, 46 P9_RLINK, 47 P9_TMKDIR = 72, 48 P9_RMKDIR, 49 P9_TRENAMEAT = 74, 50 P9_RRENAMEAT, 51 P9_TUNLINKAT = 76, 52 P9_RUNLINKAT, 53 P9_TVERSION = 100, 54 P9_RVERSION, 55 P9_TAUTH = 102, 56 P9_RAUTH, 57 P9_TATTACH = 104, 58 P9_RATTACH, 59 P9_TERROR = 106, 60 P9_RERROR, 61 P9_TFLUSH = 108, 62 P9_RFLUSH, 63 P9_TWALK = 110, 64 P9_RWALK, 65 P9_TOPEN = 112, 66 P9_ROPEN, 67 P9_TCREATE = 114, 68 P9_RCREATE, 69 P9_TREAD = 116, 70 P9_RREAD, 71 P9_TWRITE = 118, 72 P9_RWRITE, 73 P9_TCLUNK = 120, 74 P9_RCLUNK, 75 P9_TREMOVE = 122, 76 P9_RREMOVE, 77 P9_TSTAT = 124, 78 P9_RSTAT, 79 P9_TWSTAT = 126, 80 P9_RWSTAT, 81 }; 82 83 84 /* qid.types */ 85 enum { 86 P9_QTDIR = 0x80, 87 P9_QTAPPEND = 0x40, 88 P9_QTEXCL = 0x20, 89 P9_QTMOUNT = 0x10, 90 P9_QTAUTH = 0x08, 91 P9_QTTMP = 0x04, 92 P9_QTSYMLINK = 0x02, 93 P9_QTLINK = 0x01, 94 P9_QTFILE = 0x00, 95 }; 96 97 enum p9_proto_version { 98 V9FS_PROTO_2000U = 0x01, 99 V9FS_PROTO_2000L = 0x02, 100 }; 101 102 #define P9_NOTAG (u16)(~0) 103 #define P9_NOFID (u32)(~0) 104 #define P9_MAXWELEM 16 105 106 #define FID_REFERENCED 0x1 107 #define FID_NON_RECLAIMABLE 0x2 108 static inline char *rpath(FsContext *ctx, const char *path) 109 { 110 return g_strdup_printf("%s/%s", ctx->fs_root, path); 111 } 112 113 /* 114 * ample room for Twrite/Rread header 115 * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4] 116 */ 117 #define P9_IOHDRSZ 24 118 119 typedef struct V9fsPDU V9fsPDU; 120 struct V9fsState; 121 122 struct V9fsPDU 123 { 124 uint32_t size; 125 uint16_t tag; 126 uint8_t id; 127 uint8_t cancelled; 128 CoQueue complete; 129 struct V9fsState *s; 130 QLIST_ENTRY(V9fsPDU) next; 131 uint32_t idx; 132 }; 133 134 135 /* FIXME 136 * 1) change user needs to set groups and stuff 137 */ 138 139 #define MAX_REQ 128 140 #define MAX_TAG_LEN 32 141 142 #define BUG_ON(cond) assert(!(cond)) 143 144 typedef struct V9fsFidState V9fsFidState; 145 146 enum { 147 P9_FID_NONE = 0, 148 P9_FID_FILE, 149 P9_FID_DIR, 150 P9_FID_XATTR, 151 }; 152 153 typedef struct V9fsConf 154 { 155 /* tag name for the device */ 156 char *tag; 157 char *fsdev_id; 158 } V9fsConf; 159 160 typedef struct V9fsXattr 161 { 162 int64_t copied_len; 163 int64_t len; 164 void *value; 165 V9fsString name; 166 int flags; 167 } V9fsXattr; 168 169 typedef struct V9fsDir { 170 DIR *stream; 171 QemuMutex readdir_mutex; 172 } V9fsDir; 173 174 static inline void v9fs_readdir_lock(V9fsDir *dir) 175 { 176 qemu_mutex_lock(&dir->readdir_mutex); 177 } 178 179 static inline void v9fs_readdir_unlock(V9fsDir *dir) 180 { 181 qemu_mutex_unlock(&dir->readdir_mutex); 182 } 183 184 static inline void v9fs_readdir_init(V9fsDir *dir) 185 { 186 qemu_mutex_init(&dir->readdir_mutex); 187 } 188 189 /* 190 * Filled by fs driver on open and other 191 * calls. 192 */ 193 union V9fsFidOpenState { 194 int fd; 195 V9fsDir dir; 196 V9fsXattr xattr; 197 /* 198 * private pointer for fs drivers, that 199 * have its own internal representation of 200 * open files. 201 */ 202 void *private; 203 }; 204 205 struct V9fsFidState 206 { 207 int fid_type; 208 int32_t fid; 209 V9fsPath path; 210 V9fsFidOpenState fs; 211 V9fsFidOpenState fs_reclaim; 212 int flags; 213 int open_flags; 214 uid_t uid; 215 int ref; 216 int clunked; 217 V9fsFidState *next; 218 V9fsFidState *rclm_lst; 219 }; 220 221 typedef struct V9fsState 222 { 223 QLIST_HEAD(, V9fsPDU) free_list; 224 QLIST_HEAD(, V9fsPDU) active_list; 225 V9fsFidState *fid_list; 226 FileOperations *ops; 227 FsContext ctx; 228 char *tag; 229 enum p9_proto_version proto_version; 230 int32_t msize; 231 /* 232 * lock ensuring atomic path update 233 * on rename. 234 */ 235 CoRwlock rename_lock; 236 int32_t root_fid; 237 Error *migration_blocker; 238 V9fsConf fsconf; 239 V9fsQID root_qid; 240 } V9fsState; 241 242 /* 9p2000.L open flags */ 243 #define P9_DOTL_RDONLY 00000000 244 #define P9_DOTL_WRONLY 00000001 245 #define P9_DOTL_RDWR 00000002 246 #define P9_DOTL_NOACCESS 00000003 247 #define P9_DOTL_CREATE 00000100 248 #define P9_DOTL_EXCL 00000200 249 #define P9_DOTL_NOCTTY 00000400 250 #define P9_DOTL_TRUNC 00001000 251 #define P9_DOTL_APPEND 00002000 252 #define P9_DOTL_NONBLOCK 00004000 253 #define P9_DOTL_DSYNC 00010000 254 #define P9_DOTL_FASYNC 00020000 255 #define P9_DOTL_DIRECT 00040000 256 #define P9_DOTL_LARGEFILE 00100000 257 #define P9_DOTL_DIRECTORY 00200000 258 #define P9_DOTL_NOFOLLOW 00400000 259 #define P9_DOTL_NOATIME 01000000 260 #define P9_DOTL_CLOEXEC 02000000 261 #define P9_DOTL_SYNC 04000000 262 263 /* 9p2000.L at flags */ 264 #define P9_DOTL_AT_REMOVEDIR 0x200 265 266 /* 9P2000.L lock type */ 267 #define P9_LOCK_TYPE_RDLCK 0 268 #define P9_LOCK_TYPE_WRLCK 1 269 #define P9_LOCK_TYPE_UNLCK 2 270 271 #define P9_LOCK_SUCCESS 0 272 #define P9_LOCK_BLOCKED 1 273 #define P9_LOCK_ERROR 2 274 #define P9_LOCK_GRACE 3 275 276 #define P9_LOCK_FLAGS_BLOCK 1 277 #define P9_LOCK_FLAGS_RECLAIM 2 278 279 typedef struct V9fsFlock 280 { 281 uint8_t type; 282 uint32_t flags; 283 uint64_t start; /* absolute offset */ 284 uint64_t length; 285 uint32_t proc_id; 286 V9fsString client_id; 287 } V9fsFlock; 288 289 typedef struct V9fsGetlock 290 { 291 uint8_t type; 292 uint64_t start; /* absolute offset */ 293 uint64_t length; 294 uint32_t proc_id; 295 V9fsString client_id; 296 } V9fsGetlock; 297 298 extern int open_fd_hw; 299 extern int total_open_fd; 300 301 static inline void v9fs_path_write_lock(V9fsState *s) 302 { 303 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 304 qemu_co_rwlock_wrlock(&s->rename_lock); 305 } 306 } 307 308 static inline void v9fs_path_read_lock(V9fsState *s) 309 { 310 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 311 qemu_co_rwlock_rdlock(&s->rename_lock); 312 } 313 } 314 315 static inline void v9fs_path_unlock(V9fsState *s) 316 { 317 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) { 318 qemu_co_rwlock_unlock(&s->rename_lock); 319 } 320 } 321 322 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu) 323 { 324 return pdu->cancelled; 325 } 326 327 void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu); 328 void v9fs_path_init(V9fsPath *path); 329 void v9fs_path_free(V9fsPath *path); 330 void v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...); 331 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs); 332 int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath, 333 const char *name, V9fsPath *path); 334 int v9fs_device_realize_common(V9fsState *s, Error **errp); 335 void v9fs_device_unrealize_common(V9fsState *s, Error **errp); 336 337 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...); 338 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...); 339 V9fsPDU *pdu_alloc(V9fsState *s); 340 void pdu_free(V9fsPDU *pdu); 341 void pdu_submit(V9fsPDU *pdu); 342 void v9fs_reset(V9fsState *s); 343 344 #endif 345