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 <glib.h>
  10 #include "standard-headers/linux/virtio_9p.h"
  11 #include "hw/virtio/virtio.h"
  12 #include "hw/virtio/virtio-9p.h"
  13 #include "fsdev/file-op-9p.h"
  14 #include "fsdev/virtio-9p-marshal.h"
  15 #include "qemu/thread.h"
  16 #include "block/coroutine.h"
  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 char *rpath(FsContext *ctx, const char *path)
 115 {
 116     return g_strdup_printf("%s/%s", ctx->fs_root, path);
 117 }
 118
 119 /*
 120  * ample room for Twrite/Rread header
 121  * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
 122  */
 123 #define P9_IOHDRSZ 24
 124
 125 typedef struct V9fsPDU V9fsPDU;
 126 struct V9fsState;
 127
 128 struct V9fsPDU
 129 {
 130     uint32_t size;
 131     uint16_t tag;
 132     uint8_t id;
 133     uint8_t cancelled;
 134     CoQueue complete;
 135     VirtQueueElement elem;
 136     struct V9fsState *s;
 137     QLIST_ENTRY(V9fsPDU) next;
 138 };
 139
 140
 141 /* FIXME
 142  * 1) change user needs to set groups and stuff
 143  */
 144
 145 #define MAX_REQ         128
 146 #define MAX_TAG_LEN     32
 147
 148 #define BUG_ON(cond) assert(!(cond))
 149
 150 typedef struct V9fsFidState V9fsFidState;
 151
 152 enum {
 153     P9_FID_NONE = 0,
 154     P9_FID_FILE,
 155     P9_FID_DIR,
 156     P9_FID_XATTR,
 157 };
 158
 159 typedef struct V9fsXattr
 160 {
 161     int64_t copied_len;
 162     int64_t len;
 163     void *value;
 164     V9fsString name;
 165     int flags;
 166 } V9fsXattr;
 167
 168 /*
 169  * Filled by fs driver on open and other
 170  * calls.
 171  */
 172 union V9fsFidOpenState {
 173     int fd;
 174     DIR *dir;
 175     V9fsXattr xattr;
 176     /*
 177      * private pointer for fs drivers, that
 178      * have its own internal representation of
 179      * open files.
 180      */
 181     void *private;
 182 };
 183
 184 struct V9fsFidState
 185 {
 186     int fid_type;
 187     int32_t fid;
 188     V9fsPath path;
 189     V9fsFidOpenState fs;
 190     V9fsFidOpenState fs_reclaim;
 191     int flags;
 192     int open_flags;
 193     uid_t uid;
 194     int ref;
 195     int clunked;
 196     V9fsFidState *next;
 197     V9fsFidState *rclm_lst;
 198 };
 199
 200 typedef struct V9fsState
 201 {
 202     VirtIODevice parent_obj;
 203     VirtQueue *vq;
 204     V9fsPDU pdus[MAX_REQ];
 205     QLIST_HEAD(, V9fsPDU) free_list;
 206     QLIST_HEAD(, V9fsPDU) active_list;
 207     V9fsFidState *fid_list;
 208     FileOperations *ops;
 209     FsContext ctx;
 210     char *tag;
 211     size_t config_size;
 212     enum p9_proto_version proto_version;
 213     int32_t msize;
 214     /*
 215      * lock ensuring atomic path update
 216      * on rename.
 217      */
 218     CoRwlock rename_lock;
 219     int32_t root_fid;
 220     Error *migration_blocker;
 221     V9fsConf fsconf;
 222 } V9fsState;
 223
 224 typedef struct V9fsStatState {
 225     V9fsPDU *pdu;
 226     size_t offset;
 227     V9fsStat v9stat;
 228     V9fsFidState *fidp;
 229     struct stat stbuf;
 230 } V9fsStatState;
 231
 232 typedef struct V9fsOpenState {
 233     V9fsPDU *pdu;
 234     size_t offset;
 235     int32_t mode;
 236     V9fsFidState *fidp;
 237     V9fsQID qid;
 238     struct stat stbuf;
 239     int iounit;
 240 } V9fsOpenState;
 241
 242 typedef struct V9fsReadState {
 243     V9fsPDU *pdu;
 244     size_t offset;
 245     int32_t count;
 246     int32_t total;
 247     int64_t off;
 248     V9fsFidState *fidp;
 249     struct iovec iov[128]; /* FIXME: bad, bad, bad */
 250     struct iovec *sg;
 251     off_t dir_pos;
 252     struct dirent *dent;
 253     struct stat stbuf;
 254     V9fsString name;
 255     V9fsStat v9stat;
 256     int32_t len;
 257     int32_t cnt;
 258     int32_t max_count;
 259 } V9fsReadState;
 260
 261 typedef struct V9fsWriteState {
 262     V9fsPDU *pdu;
 263     size_t offset;
 264     int32_t len;
 265     int32_t count;
 266     int32_t total;
 267     int64_t off;
 268     V9fsFidState *fidp;
 269     struct iovec iov[128]; /* FIXME: bad, bad, bad */
 270     struct iovec *sg;
 271     int cnt;
 272 } V9fsWriteState;
 273
 274 typedef struct V9fsMkState {
 275     V9fsPDU *pdu;
 276     size_t offset;
 277     V9fsQID qid;
 278     struct stat stbuf;
 279     V9fsString name;
 280     V9fsString fullname;
 281 } V9fsMkState;
 282
 283 /* 9p2000.L open flags */
 284 #define P9_DOTL_RDONLY        00000000
 285 #define P9_DOTL_WRONLY        00000001
 286 #define P9_DOTL_RDWR          00000002
 287 #define P9_DOTL_NOACCESS      00000003
 288 #define P9_DOTL_CREATE        00000100
 289 #define P9_DOTL_EXCL          00000200
 290 #define P9_DOTL_NOCTTY        00000400
 291 #define P9_DOTL_TRUNC         00001000
 292 #define P9_DOTL_APPEND        00002000
 293 #define P9_DOTL_NONBLOCK      00004000
 294 #define P9_DOTL_DSYNC         00010000
 295 #define P9_DOTL_FASYNC        00020000
 296 #define P9_DOTL_DIRECT        00040000
 297 #define P9_DOTL_LARGEFILE     00100000
 298 #define P9_DOTL_DIRECTORY     00200000
 299 #define P9_DOTL_NOFOLLOW      00400000
 300 #define P9_DOTL_NOATIME       01000000
 301 #define P9_DOTL_CLOEXEC       02000000
 302 #define P9_DOTL_SYNC          04000000
 303
 304 /* 9p2000.L at flags */
 305 #define P9_DOTL_AT_REMOVEDIR         0x200
 306
 307 /* 9P2000.L lock type */
 308 #define P9_LOCK_TYPE_RDLCK 0
 309 #define P9_LOCK_TYPE_WRLCK 1
 310 #define P9_LOCK_TYPE_UNLCK 2
 311
 312 #define P9_LOCK_SUCCESS 0
 313 #define P9_LOCK_BLOCKED 1
 314 #define P9_LOCK_ERROR 2
 315 #define P9_LOCK_GRACE 3
 316
 317 #define P9_LOCK_FLAGS_BLOCK 1
 318 #define P9_LOCK_FLAGS_RECLAIM 2
 319
 320 typedef struct V9fsFlock
 321 {
 322     uint8_t type;
 323     uint32_t flags;
 324     uint64_t start; /* absolute offset */
 325     uint64_t length;
 326     uint32_t proc_id;
 327     V9fsString client_id;
 328 } V9fsFlock;
 329
 330 typedef struct V9fsGetlock
 331 {
 332     uint8_t type;
 333     uint64_t start; /* absolute offset */
 334     uint64_t length;
 335     uint32_t proc_id;
 336     V9fsString client_id;
 337 } V9fsGetlock;
 338
 339 extern int open_fd_hw;
 340 extern int total_open_fd;
 341
 342 size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
 343                       size_t offset, size_t size, int pack);
 344
 345 static inline size_t do_pdu_unpack(void *dst, struct iovec *sg, int sg_count,
 346                         size_t offset, size_t size)
 347 {
 348     return pdu_packunpack(dst, sg, sg_count, offset, size, 0);
 349 }
 350
 351 static inline void v9fs_path_write_lock(V9fsState *s)
 352 {
 353     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 354         qemu_co_rwlock_wrlock(&s->rename_lock);
 355     }
 356 }
 357
 358 static inline void v9fs_path_read_lock(V9fsState *s)
 359 {
 360     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 361         qemu_co_rwlock_rdlock(&s->rename_lock);
 362     }
 363 }
 364
 365 static inline void v9fs_path_unlock(V9fsState *s)
 366 {
 367     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 368         qemu_co_rwlock_unlock(&s->rename_lock);
 369     }
 370 }
 371
 372 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
 373 {
 374     return pdu->cancelled;
 375 }
 376
 377 extern void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq);
 378 extern void v9fs_reclaim_fd(V9fsPDU *pdu);
 379 extern void v9fs_path_init(V9fsPath *path);
 380 extern void v9fs_path_free(V9fsPath *path);
 381 extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
 382 extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
 383                              const char *name, V9fsPath *path);
 384
 385 #define pdu_marshal(pdu, offset, fmt, args...)  \
 386     v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset, 1, fmt, ##args)
 387 #define pdu_unmarshal(pdu, offset, fmt, args...)  \
 388     v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset, 1, fmt, ##args)
 389
 390 #define TYPE_VIRTIO_9P "virtio-9p-device"
 391 #define VIRTIO_9P(obj) \
 392         OBJECT_CHECK(V9fsState, (obj), TYPE_VIRTIO_9P)
 393
 394 #endif