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 "fsdev/virtio-9p-marshal.h"
  12 #include "qemu-thread.h"
  13 #include "qemu-coroutine.h"
  14
  15
  16 /* The feature bitmap for virtio 9P */
  17 /* The mount point is specified in a config variable */
  18 #define VIRTIO_9P_MOUNT_TAG 0
  19
  20 enum {
  21     P9_TLERROR = 6,
  22     P9_RLERROR,
  23     P9_TSTATFS = 8,
  24     P9_RSTATFS,
  25     P9_TLOPEN = 12,
  26     P9_RLOPEN,
  27     P9_TLCREATE = 14,
  28     P9_RLCREATE,
  29     P9_TSYMLINK = 16,
  30     P9_RSYMLINK,
  31     P9_TMKNOD = 18,
  32     P9_RMKNOD,
  33     P9_TRENAME = 20,
  34     P9_RRENAME,
  35     P9_TREADLINK = 22,
  36     P9_RREADLINK,
  37     P9_TGETATTR = 24,
  38     P9_RGETATTR,
  39     P9_TSETATTR = 26,
  40     P9_RSETATTR,
  41     P9_TXATTRWALK = 30,
  42     P9_RXATTRWALK,
  43     P9_TXATTRCREATE = 32,
  44     P9_RXATTRCREATE,
  45     P9_TREADDIR = 40,
  46     P9_RREADDIR,
  47     P9_TFSYNC = 50,
  48     P9_RFSYNC,
  49     P9_TLOCK = 52,
  50     P9_RLOCK,
  51     P9_TGETLOCK = 54,
  52     P9_RGETLOCK,
  53     P9_TLINK = 70,
  54     P9_RLINK,
  55     P9_TMKDIR = 72,
  56     P9_RMKDIR,
  57     P9_TRENAMEAT = 74,
  58     P9_RRENAMEAT,
  59     P9_TUNLINKAT = 76,
  60     P9_RUNLINKAT,
  61     P9_TVERSION = 100,
  62     P9_RVERSION,
  63     P9_TAUTH = 102,
  64     P9_RAUTH,
  65     P9_TATTACH = 104,
  66     P9_RATTACH,
  67     P9_TERROR = 106,
  68     P9_RERROR,
  69     P9_TFLUSH = 108,
  70     P9_RFLUSH,
  71     P9_TWALK = 110,
  72     P9_RWALK,
  73     P9_TOPEN = 112,
  74     P9_ROPEN,
  75     P9_TCREATE = 114,
  76     P9_RCREATE,
  77     P9_TREAD = 116,
  78     P9_RREAD,
  79     P9_TWRITE = 118,
  80     P9_RWRITE,
  81     P9_TCLUNK = 120,
  82     P9_RCLUNK,
  83     P9_TREMOVE = 122,
  84     P9_RREMOVE,
  85     P9_TSTAT = 124,
  86     P9_RSTAT,
  87     P9_TWSTAT = 126,
  88     P9_RWSTAT,
  89 };
  90
  91
  92 /* qid.types */
  93 enum {
  94     P9_QTDIR = 0x80,
  95     P9_QTAPPEND = 0x40,
  96     P9_QTEXCL = 0x20,
  97     P9_QTMOUNT = 0x10,
  98     P9_QTAUTH = 0x08,
  99     P9_QTTMP = 0x04,
 100     P9_QTSYMLINK = 0x02,
 101     P9_QTLINK = 0x01,
 102     P9_QTFILE = 0x00,
 103 };
 104
 105 enum p9_proto_version {
 106     V9FS_PROTO_2000U = 0x01,
 107     V9FS_PROTO_2000L = 0x02,
 108 };
 109
 110 #define P9_NOTAG    (u16)(~0)
 111 #define P9_NOFID    (u32)(~0)
 112 #define P9_MAXWELEM 16
 113
 114 #define FID_REFERENCED          0x1
 115 #define FID_NON_RECLAIMABLE     0x2
 116 static inline const char *rpath(FsContext *ctx, const char *path, char *buffer)
 117 {
 118     snprintf(buffer, PATH_MAX, "%s/%s", ctx->fs_root, path);
 119     return buffer;
 120 }
 121
 122 /*
 123  * ample room for Twrite/Rread header
 124  * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
 125  */
 126 #define P9_IOHDRSZ 24
 127
 128 typedef struct V9fsPDU V9fsPDU;
 129 struct V9fsState;
 130
 131 struct V9fsPDU
 132 {
 133     uint32_t size;
 134     uint16_t tag;
 135     uint8_t id;
 136     uint8_t cancelled;
 137     CoQueue complete;
 138     VirtQueueElement elem;
 139     struct V9fsState *s;
 140     QLIST_ENTRY(V9fsPDU) next;
 141 };
 142
 143
 144 /* FIXME
 145  * 1) change user needs to set groups and stuff
 146  */
 147
 148 /* from Linux's linux/virtio_9p.h */
 149
 150 /* The ID for virtio console */
 151 #define VIRTIO_ID_9P    9
 152 #define MAX_REQ         128
 153 #define MAX_TAG_LEN     32
 154
 155 #define BUG_ON(cond) assert(!(cond))
 156
 157 typedef struct V9fsFidState V9fsFidState;
 158
 159 enum {
 160     P9_FID_NONE = 0,
 161     P9_FID_FILE,
 162     P9_FID_DIR,
 163     P9_FID_XATTR,
 164 };
 165
 166 typedef struct V9fsXattr
 167 {
 168     int64_t copied_len;
 169     int64_t len;
 170     void *value;
 171     V9fsString name;
 172     int flags;
 173 } V9fsXattr;
 174
 175 /*
 176  * Filled by fs driver on open and other
 177  * calls.
 178  */
 179 union V9fsFidOpenState {
 180     int fd;
 181     DIR *dir;
 182     V9fsXattr xattr;
 183     /*
 184      * private pointer for fs drivers, that
 185      * have its own internal representation of
 186      * open files.
 187      */
 188     void *private;
 189 };
 190
 191 struct V9fsFidState
 192 {
 193     int fid_type;
 194     int32_t fid;
 195     V9fsPath path;
 196     V9fsFidOpenState fs;
 197     V9fsFidOpenState fs_reclaim;
 198     int flags;
 199     int open_flags;
 200     uid_t uid;
 201     int ref;
 202     int clunked;
 203     V9fsFidState *next;
 204     V9fsFidState *rclm_lst;
 205 };
 206
 207 typedef struct V9fsState
 208 {
 209     VirtIODevice vdev;
 210     VirtQueue *vq;
 211     V9fsPDU pdus[MAX_REQ];
 212     QLIST_HEAD(, V9fsPDU) free_list;
 213     QLIST_HEAD(, V9fsPDU) active_list;
 214     V9fsFidState *fid_list;
 215     FileOperations *ops;
 216     FsContext ctx;
 217     char *tag;
 218     size_t config_size;
 219     enum p9_proto_version proto_version;
 220     int32_t msize;
 221     /*
 222      * lock ensuring atomic path update
 223      * on rename.
 224      */
 225     CoRwlock rename_lock;
 226     int32_t root_fid;
 227     Error *migration_blocker;
 228 } V9fsState;
 229
 230 typedef struct V9fsStatState {
 231     V9fsPDU *pdu;
 232     size_t offset;
 233     V9fsStat v9stat;
 234     V9fsFidState *fidp;
 235     struct stat stbuf;
 236 } V9fsStatState;
 237
 238 typedef struct V9fsOpenState {
 239     V9fsPDU *pdu;
 240     size_t offset;
 241     int32_t mode;
 242     V9fsFidState *fidp;
 243     V9fsQID qid;
 244     struct stat stbuf;
 245     int iounit;
 246 } V9fsOpenState;
 247
 248 typedef struct V9fsReadState {
 249     V9fsPDU *pdu;
 250     size_t offset;
 251     int32_t count;
 252     int32_t total;
 253     int64_t off;
 254     V9fsFidState *fidp;
 255     struct iovec iov[128]; /* FIXME: bad, bad, bad */
 256     struct iovec *sg;
 257     off_t dir_pos;
 258     struct dirent *dent;
 259     struct stat stbuf;
 260     V9fsString name;
 261     V9fsStat v9stat;
 262     int32_t len;
 263     int32_t cnt;
 264     int32_t max_count;
 265 } V9fsReadState;
 266
 267 typedef struct V9fsWriteState {
 268     V9fsPDU *pdu;
 269     size_t offset;
 270     int32_t len;
 271     int32_t count;
 272     int32_t total;
 273     int64_t off;
 274     V9fsFidState *fidp;
 275     struct iovec iov[128]; /* FIXME: bad, bad, bad */
 276     struct iovec *sg;
 277     int cnt;
 278 } V9fsWriteState;
 279
 280 struct virtio_9p_config
 281 {
 282     /* number of characters in tag */
 283     uint16_t tag_len;
 284     /* Variable size tag name */
 285     uint8_t tag[0];
 286 } QEMU_PACKED;
 287
 288 typedef struct V9fsMkState {
 289     V9fsPDU *pdu;
 290     size_t offset;
 291     V9fsQID qid;
 292     struct stat stbuf;
 293     V9fsString name;
 294     V9fsString fullname;
 295 } V9fsMkState;
 296
 297 /* 9p2000.L open flags */
 298 #define P9_DOTL_RDONLY        00000000
 299 #define P9_DOTL_WRONLY        00000001
 300 #define P9_DOTL_RDWR          00000002
 301 #define P9_DOTL_NOACCESS      00000003
 302 #define P9_DOTL_CREATE        00000100
 303 #define P9_DOTL_EXCL          00000200
 304 #define P9_DOTL_NOCTTY        00000400
 305 #define P9_DOTL_TRUNC         00001000
 306 #define P9_DOTL_APPEND        00002000
 307 #define P9_DOTL_NONBLOCK      00004000
 308 #define P9_DOTL_DSYNC         00010000
 309 #define P9_DOTL_FASYNC        00020000
 310 #define P9_DOTL_DIRECT        00040000
 311 #define P9_DOTL_LARGEFILE     00100000
 312 #define P9_DOTL_DIRECTORY     00200000
 313 #define P9_DOTL_NOFOLLOW      00400000
 314 #define P9_DOTL_NOATIME       01000000
 315 #define P9_DOTL_CLOEXEC       02000000
 316 #define P9_DOTL_SYNC          04000000
 317
 318 /* 9p2000.L at flags */
 319 #define P9_DOTL_AT_REMOVEDIR         0x200
 320
 321 /* 9P2000.L lock type */
 322 #define P9_LOCK_TYPE_RDLCK 0
 323 #define P9_LOCK_TYPE_WRLCK 1
 324 #define P9_LOCK_TYPE_UNLCK 2
 325
 326 #define P9_LOCK_SUCCESS 0
 327 #define P9_LOCK_BLOCKED 1
 328 #define P9_LOCK_ERROR 2
 329 #define P9_LOCK_GRACE 3
 330
 331 #define P9_LOCK_FLAGS_BLOCK 1
 332 #define P9_LOCK_FLAGS_RECLAIM 2
 333
 334 typedef struct V9fsFlock
 335 {
 336     uint8_t type;
 337     uint32_t flags;
 338     uint64_t start; /* absolute offset */
 339     uint64_t length;
 340     uint32_t proc_id;
 341     V9fsString client_id;
 342 } V9fsFlock;
 343
 344 typedef struct V9fsGetlock
 345 {
 346     uint8_t type;
 347     uint64_t start; /* absolute offset */
 348     uint64_t length;
 349     uint32_t proc_id;
 350     V9fsString client_id;
 351 } V9fsGetlock;
 352
 353 extern int open_fd_hw;
 354 extern int total_open_fd;
 355
 356 size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count,
 357                       size_t offset, size_t size, int pack);
 358
 359 static inline size_t do_pdu_unpack(void *dst, struct iovec *sg, int sg_count,
 360                         size_t offset, size_t size)
 361 {
 362     return pdu_packunpack(dst, sg, sg_count, offset, size, 0);
 363 }
 364
 365 static inline void v9fs_path_write_lock(V9fsState *s)
 366 {
 367     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 368         qemu_co_rwlock_wrlock(&s->rename_lock);
 369     }
 370 }
 371
 372 static inline void v9fs_path_read_lock(V9fsState *s)
 373 {
 374     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 375         qemu_co_rwlock_rdlock(&s->rename_lock);
 376     }
 377 }
 378
 379 static inline void v9fs_path_unlock(V9fsState *s)
 380 {
 381     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 382         qemu_co_rwlock_unlock(&s->rename_lock);
 383     }
 384 }
 385
 386 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
 387 {
 388     return pdu->cancelled;
 389 }
 390
 391 extern void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq);
 392 extern void virtio_9p_set_fd_limit(void);
 393 extern void v9fs_reclaim_fd(V9fsPDU *pdu);
 394 extern void v9fs_path_init(V9fsPath *path);
 395 extern void v9fs_path_free(V9fsPath *path);
 396 extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
 397 extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
 398                              const char *name, V9fsPath *path);
 399
 400 #define pdu_marshal(pdu, offset, fmt, args...)  \
 401     v9fs_marshal(pdu->elem.in_sg, pdu->elem.in_num, offset, 1, fmt, ##args)
 402 #define pdu_unmarshal(pdu, offset, fmt, args...)  \
 403     v9fs_unmarshal(pdu->elem.out_sg, pdu->elem.out_num, offset, 1, fmt, ##args)
 404
 405 #endif