hw/9pfs/virtio-9p.h

   1 #ifndef _QEMU_VIRTIO_9P_H
   2 #define _QEMU_VIRTIO_9P_H
   3
   4 #include <sys/types.h>
   5 #include <dirent.h>
   6 #include <sys/time.h>
   7 #include <utime.h>
   8 #include <sys/resource.h>
   9 #include "hw/virtio.h"
  10 #include "fsdev/file-op-9p.h"
  11 #include "qemu-thread.h"
  12 #include "qemu-coroutine.h"
  13
  14 /* The feature bitmap for virtio 9P */
  15 /* The mount point is specified in a config variable */
  16 #define VIRTIO_9P_MOUNT_TAG 0
  17
  18 enum {
  19     P9_TLERROR = 6,
  20     P9_RLERROR,
  21     P9_TSTATFS = 8,
  22     P9_RSTATFS,
  23     P9_TLOPEN = 12,
  24     P9_RLOPEN,
  25     P9_TLCREATE = 14,
  26     P9_RLCREATE,
  27     P9_TSYMLINK = 16,
  28     P9_RSYMLINK,
  29     P9_TMKNOD = 18,
  30     P9_RMKNOD,
  31     P9_TRENAME = 20,
  32     P9_RRENAME,
  33     P9_TREADLINK = 22,
  34     P9_RREADLINK,
  35     P9_TGETATTR = 24,
  36     P9_RGETATTR,
  37     P9_TSETATTR = 26,
  38     P9_RSETATTR,
  39     P9_TXATTRWALK = 30,
  40     P9_RXATTRWALK,
  41     P9_TXATTRCREATE = 32,
  42     P9_RXATTRCREATE,
  43     P9_TREADDIR = 40,
  44     P9_RREADDIR,
  45     P9_TFSYNC = 50,
  46     P9_RFSYNC,
  47     P9_TLOCK = 52,
  48     P9_RLOCK,
  49     P9_TGETLOCK = 54,
  50     P9_RGETLOCK,
  51     P9_TLINK = 70,
  52     P9_RLINK,
  53     P9_TMKDIR = 72,
  54     P9_RMKDIR,
  55     P9_TRENAMEAT = 74,
  56     P9_RRENAMEAT,
  57     P9_TUNLINKAT = 76,
  58     P9_RUNLINKAT,
  59     P9_TVERSION = 100,
  60     P9_RVERSION,
  61     P9_TAUTH = 102,
  62     P9_RAUTH,
  63     P9_TATTACH = 104,
  64     P9_RATTACH,
  65     P9_TERROR = 106,
  66     P9_RERROR,
  67     P9_TFLUSH = 108,
  68     P9_RFLUSH,
  69     P9_TWALK = 110,
  70     P9_RWALK,
  71     P9_TOPEN = 112,
  72     P9_ROPEN,
  73     P9_TCREATE = 114,
  74     P9_RCREATE,
  75     P9_TREAD = 116,
  76     P9_RREAD,
  77     P9_TWRITE = 118,
  78     P9_RWRITE,
  79     P9_TCLUNK = 120,
  80     P9_RCLUNK,
  81     P9_TREMOVE = 122,
  82     P9_RREMOVE,
  83     P9_TSTAT = 124,
  84     P9_RSTAT,
  85     P9_TWSTAT = 126,
  86     P9_RWSTAT,
  87 };
  88
  89
  90 /* qid.types */
  91 enum {
  92     P9_QTDIR = 0x80,
  93     P9_QTAPPEND = 0x40,
  94     P9_QTEXCL = 0x20,
  95     P9_QTMOUNT = 0x10,
  96     P9_QTAUTH = 0x08,
  97     P9_QTTMP = 0x04,
  98     P9_QTSYMLINK = 0x02,
  99     P9_QTLINK = 0x01,
 100     P9_QTFILE = 0x00,
 101 };
 102
 103 enum p9_proto_version {
 104     V9FS_PROTO_2000U = 0x01,
 105     V9FS_PROTO_2000L = 0x02,
 106 };
 107
 108 #define P9_NOTAG    (u16)(~0)
 109 #define P9_NOFID    (u32)(~0)
 110 #define P9_MAXWELEM 16
 111
 112 #define FID_REFERENCED          0x1
 113 #define FID_NON_RECLAIMABLE     0x2
 114 static inline const char *rpath(FsContext *ctx, const char *path, char *buffer)
 115 {
 116     snprintf(buffer, PATH_MAX, "%s/%s", ctx->fs_root, path);
 117     return buffer;
 118 }
 119
 120 /*
 121  * ample room for Twrite/Rread header
 122  * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
 123  */
 124 #define P9_IOHDRSZ 24
 125
 126 typedef struct V9fsPDU V9fsPDU;
 127 struct V9fsState;
 128
 129 struct V9fsPDU
 130 {
 131     uint32_t size;
 132     uint16_t tag;
 133     uint8_t id;
 134     uint8_t cancelled;
 135     CoQueue complete;
 136     VirtQueueElement elem;
 137     struct V9fsState *s;
 138     QLIST_ENTRY(V9fsPDU) next;
 139 };
 140
 141
 142 /* FIXME
 143  * 1) change user needs to set groups and stuff
 144  */
 145
 146 /* from Linux's linux/virtio_9p.h */
 147
 148 /* The ID for virtio console */
 149 #define VIRTIO_ID_9P    9
 150 #define MAX_REQ         128
 151 #define MAX_TAG_LEN     32
 152
 153 #define BUG_ON(cond) assert(!(cond))
 154
 155 typedef struct V9fsFidState V9fsFidState;
 156
 157 typedef struct V9fsString
 158 {
 159     int16_t size;
 160     char *data;
 161 } V9fsString;
 162
 163 typedef struct V9fsQID
 164 {
 165     int8_t type;
 166     int32_t version;
 167     int64_t path;
 168 } V9fsQID;
 169
 170 typedef struct V9fsStat
 171 {
 172     int16_t size;
 173     int16_t type;
 174     int32_t dev;
 175     V9fsQID qid;
 176     int32_t mode;
 177     int32_t atime;
 178     int32_t mtime;
 179     int64_t length;
 180     V9fsString name;
 181     V9fsString uid;
 182     V9fsString gid;
 183     V9fsString muid;
 184     /* 9p2000.u */
 185     V9fsString extension;
 186    int32_t n_uid;
 187     int32_t n_gid;
 188     int32_t n_muid;
 189 } V9fsStat;
 190
 191 enum {
 192     P9_FID_NONE = 0,
 193     P9_FID_FILE,
 194     P9_FID_DIR,
 195     P9_FID_XATTR,
 196 };
 197
 198 typedef struct V9fsXattr
 199 {
 200     int64_t copied_len;
 201     int64_t len;
 202     void *value;
 203     V9fsString name;
 204     int flags;
 205 } V9fsXattr;
 206
 207 /*
 208  * Filled by fs driver on open and other
 209  * calls.
 210  */
 211 union V9fsFidOpenState {
 212     int fd;
 213     DIR *dir;
 214     V9fsXattr xattr;
 215 };
 216
 217 struct V9fsFidState
 218 {
 219     int fid_type;
 220     int32_t fid;
 221     V9fsPath path;
 222     V9fsFidOpenState fs;
 223     V9fsFidOpenState fs_reclaim;
 224     int flags;
 225     int open_flags;
 226     uid_t uid;
 227     int ref;
 228     int clunked;
 229     V9fsFidState *next;
 230     V9fsFidState *rclm_lst;
 231 };
 232
 233 typedef struct V9fsState
 234 {
 235     VirtIODevice vdev;
 236     VirtQueue *vq;
 237     V9fsPDU pdus[MAX_REQ];
 238     QLIST_HEAD(, V9fsPDU) free_list;
 239     QLIST_HEAD(, V9fsPDU) active_list;
 240     V9fsFidState *fid_list;
 241     FileOperations *ops;
 242     FsContext ctx;
 243     uint16_t tag_len;
 244     uint8_t *tag;
 245     size_t config_size;
 246     enum p9_proto_version proto_version;
 247     int32_t msize;
 248     /*
 249      * lock ensuring atomic path update
 250      * on rename.
 251      */
 252     CoRwlock rename_lock;
 253 } V9fsState;
 254
 255 typedef struct V9fsStatState {
 256     V9fsPDU *pdu;
 257     size_t offset;
 258     V9fsStat v9stat;
 259     V9fsFidState *fidp;
 260     struct stat stbuf;
 261 } V9fsStatState;
 262
 263 typedef struct V9fsStatDotl {
 264     uint64_t st_result_mask;
 265     V9fsQID qid;
 266     uint32_t st_mode;
 267     uint32_t st_uid;
 268     uint32_t st_gid;
 269     uint64_t st_nlink;
 270     uint64_t st_rdev;
 271     uint64_t st_size;
 272     uint64_t st_blksize;
 273     uint64_t st_blocks;
 274     uint64_t st_atime_sec;
 275     uint64_t st_atime_nsec;
 276     uint64_t st_mtime_sec;
 277     uint64_t st_mtime_nsec;
 278     uint64_t st_ctime_sec;
 279     uint64_t st_ctime_nsec;
 280     uint64_t st_btime_sec;
 281     uint64_t st_btime_nsec;
 282     uint64_t st_gen;
 283     uint64_t st_data_version;
 284 } V9fsStatDotl;
 285
 286 typedef struct V9fsOpenState {
 287     V9fsPDU *pdu;
 288     size_t offset;
 289     int32_t mode;
 290     V9fsFidState *fidp;
 291     V9fsQID qid;
 292     struct stat stbuf;
 293     int iounit;
 294 } V9fsOpenState;
 295
 296 typedef struct V9fsReadState {
 297     V9fsPDU *pdu;
 298     size_t offset;
 299     int32_t count;
 300     int32_t total;
 301     int64_t off;
 302     V9fsFidState *fidp;
 303     struct iovec iov[128]; /* FIXME: bad, bad, bad */
 304     struct iovec *sg;
 305     off_t dir_pos;
 306     struct dirent *dent;
 307     struct stat stbuf;
 308     V9fsString name;
 309     V9fsStat v9stat;
 310     int32_t len;
 311     int32_t cnt;
 312     int32_t max_count;
 313 } V9fsReadState;
 314
 315 typedef struct V9fsWriteState {
 316     V9fsPDU *pdu;
 317     size_t offset;
 318     int32_t len;
 319     int32_t count;
 320     int32_t total;
 321     int64_t off;
 322     V9fsFidState *fidp;
 323     struct iovec iov[128]; /* FIXME: bad, bad, bad */
 324     struct iovec *sg;
 325     int cnt;
 326 } V9fsWriteState;
 327
 328 typedef struct V9fsIattr
 329 {
 330     int32_t valid;
 331     int32_t mode;
 332     int32_t uid;
 333     int32_t gid;
 334     int64_t size;
 335     int64_t atime_sec;
 336     int64_t atime_nsec;
 337     int64_t mtime_sec;
 338     int64_t mtime_nsec;
 339 } V9fsIattr;
 340
 341 struct virtio_9p_config
 342 {
 343     /* number of characters in tag */
 344     uint16_t tag_len;
 345     /* Variable size tag name */
 346     uint8_t tag[0];
 347 } QEMU_PACKED;
 348
 349 typedef struct V9fsMkState {
 350     V9fsPDU *pdu;
 351     size_t offset;
 352     V9fsQID qid;
 353     struct stat stbuf;
 354     V9fsString name;
 355     V9fsString fullname;
 356 } V9fsMkState;
 357
 358 /* 9p2000.L open flags */
 359 #define P9_DOTL_RDONLY        00000000
 360 #define P9_DOTL_WRONLY        00000001
 361 #define P9_DOTL_RDWR          00000002
 362 #define P9_DOTL_NOACCESS      00000003
 363 #define P9_DOTL_CREATE        00000100
 364 #define P9_DOTL_EXCL          00000200
 365 #define P9_DOTL_NOCTTY        00000400
 366 #define P9_DOTL_TRUNC         00001000
 367 #define P9_DOTL_APPEND        00002000
 368 #define P9_DOTL_NONBLOCK      00004000
 369 #define P9_DOTL_DSYNC         00010000
 370 #define P9_DOTL_FASYNC        00020000
 371 #define P9_DOTL_DIRECT        00040000
 372 #define P9_DOTL_LARGEFILE     00100000
 373 #define P9_DOTL_DIRECTORY     00200000
 374 #define P9_DOTL_NOFOLLOW      00400000
 375 #define P9_DOTL_NOATIME       01000000
 376 #define P9_DOTL_CLOEXEC       02000000
 377 #define P9_DOTL_SYNC          04000000
 378
 379 /* 9p2000.L at flags */
 380 #define P9_DOTL_AT_REMOVEDIR         0x200
 381
 382 /* 9P2000.L lock type */
 383 #define P9_LOCK_TYPE_RDLCK 0
 384 #define P9_LOCK_TYPE_WRLCK 1
 385 #define P9_LOCK_TYPE_UNLCK 2
 386
 387 #define P9_LOCK_SUCCESS 0
 388 #define P9_LOCK_BLOCKED 1
 389 #define P9_LOCK_ERROR 2
 390 #define P9_LOCK_GRACE 3
 391
 392 #define P9_LOCK_FLAGS_BLOCK 1
 393 #define P9_LOCK_FLAGS_RECLAIM 2
 394
 395 typedef struct V9fsFlock
 396 {
 397     uint8_t type;
 398     uint32_t flags;
 399     uint64_t start; /* absolute offset */
 400     uint64_t length;
 401     uint32_t proc_id;
 402     V9fsString client_id;
 403 } V9fsFlock;
 404
 405 typedef struct V9fsGetlock
 406 {
 407     uint8_t type;
 408     uint64_t start; /* absolute offset */
 409     uint64_t length;
 410     uint32_t proc_id;
 411     V9fsString client_id;
 412 } V9fsGetlock;
 413
 414 extern int open_fd_hw;
 415 extern int total_open_fd;
 416
 417 size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
 418                       size_t offset, size_t size, int pack);
 419
 420 static inline size_t do_pdu_unpack(void *dst, struct iovec *sg, int sg_count,
 421                         size_t offset, size_t size)
 422 {
 423     return pdu_packunpack(dst, sg, sg_count, offset, size, 0);
 424 }
 425
 426 static inline void v9fs_path_write_lock(V9fsState *s)
 427 {
 428     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 429         qemu_co_rwlock_wrlock(&s->rename_lock);
 430     }
 431 }
 432
 433 static inline void v9fs_path_read_lock(V9fsState *s)
 434 {
 435     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 436         qemu_co_rwlock_rdlock(&s->rename_lock);
 437     }
 438 }
 439
 440 static inline void v9fs_path_unlock(V9fsState *s)
 441 {
 442     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 443         qemu_co_rwlock_unlock(&s->rename_lock);
 444     }
 445 }
 446
 447 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
 448 {
 449     return pdu->cancelled;
 450 }
 451
 452 extern void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq);
 453 extern void virtio_9p_set_fd_limit(void);
 454 extern void v9fs_reclaim_fd(V9fsPDU *pdu);
 455 extern void v9fs_string_init(V9fsString *str);
 456 extern void v9fs_string_free(V9fsString *str);
 457 extern void v9fs_string_null(V9fsString *str);
 458 extern void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...);
 459 extern void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs);
 460 extern void v9fs_path_init(V9fsPath *path);
 461 extern void v9fs_path_free(V9fsPath *path);
 462 extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
 463 extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
 464                              const char *name, V9fsPath *path);
 465 #endif