hw/9pfs/9p.h

   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    UINT16_MAX
 103 #define P9_NOFID    UINT32_MAX
 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 typedef struct {
 123     uint32_t size_le;
 124     uint8_t id;
 125     uint16_t tag_le;
 126 } QEMU_PACKED P9MsgHeader;
 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     struct V9fsState *s;
 136     QLIST_ENTRY(V9fsPDU) next;
 137     uint32_t idx;
 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 V9fsConf
 160 {
 161     /* tag name for the device */
 162     char *tag;
 163     char *fsdev_id;
 164 } V9fsConf;
 165
 166 typedef struct V9fsXattr
 167 {
 168     uint64_t copied_len;
 169     uint64_t len;
 170     void *value;
 171     V9fsString name;
 172     int flags;
 173     bool xattrwalk_fid;
 174 } V9fsXattr;
 175
 176 typedef struct V9fsDir {
 177     DIR *stream;
 178     QemuMutex readdir_mutex;
 179 } V9fsDir;
 180
 181 static inline void v9fs_readdir_lock(V9fsDir *dir)
 182 {
 183     qemu_mutex_lock(&dir->readdir_mutex);
 184 }
 185
 186 static inline void v9fs_readdir_unlock(V9fsDir *dir)
 187 {
 188     qemu_mutex_unlock(&dir->readdir_mutex);
 189 }
 190
 191 static inline void v9fs_readdir_init(V9fsDir *dir)
 192 {
 193     qemu_mutex_init(&dir->readdir_mutex);
 194 }
 195
 196 /*
 197  * Filled by fs driver on open and other
 198  * calls.
 199  */
 200 union V9fsFidOpenState {
 201     int fd;
 202     V9fsDir dir;
 203     V9fsXattr xattr;
 204     /*
 205      * private pointer for fs drivers, that
 206      * have its own internal representation of
 207      * open files.
 208      */
 209     void *private;
 210 };
 211
 212 struct V9fsFidState
 213 {
 214     int fid_type;
 215     int32_t fid;
 216     V9fsPath path;
 217     V9fsFidOpenState fs;
 218     V9fsFidOpenState fs_reclaim;
 219     int flags;
 220     int open_flags;
 221     uid_t uid;
 222     int ref;
 223     int clunked;
 224     V9fsFidState *next;
 225     V9fsFidState *rclm_lst;
 226 };
 227
 228 typedef struct V9fsState
 229 {
 230     QLIST_HEAD(, V9fsPDU) free_list;
 231     QLIST_HEAD(, V9fsPDU) active_list;
 232     V9fsFidState *fid_list;
 233     FileOperations *ops;
 234     FsContext ctx;
 235     char *tag;
 236     enum p9_proto_version proto_version;
 237     int32_t msize;
 238     V9fsPDU pdus[MAX_REQ];
 239     const struct V9fsTransport *transport;
 240     /*
 241      * lock ensuring atomic path update
 242      * on rename.
 243      */
 244     CoRwlock rename_lock;
 245     int32_t root_fid;
 246     Error *migration_blocker;
 247     V9fsConf fsconf;
 248     V9fsQID root_qid;
 249 } V9fsState;
 250
 251 /* 9p2000.L open flags */
 252 #define P9_DOTL_RDONLY        00000000
 253 #define P9_DOTL_WRONLY        00000001
 254 #define P9_DOTL_RDWR          00000002
 255 #define P9_DOTL_NOACCESS      00000003
 256 #define P9_DOTL_CREATE        00000100
 257 #define P9_DOTL_EXCL          00000200
 258 #define P9_DOTL_NOCTTY        00000400
 259 #define P9_DOTL_TRUNC         00001000
 260 #define P9_DOTL_APPEND        00002000
 261 #define P9_DOTL_NONBLOCK      00004000
 262 #define P9_DOTL_DSYNC         00010000
 263 #define P9_DOTL_FASYNC        00020000
 264 #define P9_DOTL_DIRECT        00040000
 265 #define P9_DOTL_LARGEFILE     00100000
 266 #define P9_DOTL_DIRECTORY     00200000
 267 #define P9_DOTL_NOFOLLOW      00400000
 268 #define P9_DOTL_NOATIME       01000000
 269 #define P9_DOTL_CLOEXEC       02000000
 270 #define P9_DOTL_SYNC          04000000
 271
 272 /* 9p2000.L at flags */
 273 #define P9_DOTL_AT_REMOVEDIR         0x200
 274
 275 /* 9P2000.L lock type */
 276 #define P9_LOCK_TYPE_RDLCK 0
 277 #define P9_LOCK_TYPE_WRLCK 1
 278 #define P9_LOCK_TYPE_UNLCK 2
 279
 280 #define P9_LOCK_SUCCESS 0
 281 #define P9_LOCK_BLOCKED 1
 282 #define P9_LOCK_ERROR 2
 283 #define P9_LOCK_GRACE 3
 284
 285 #define P9_LOCK_FLAGS_BLOCK 1
 286 #define P9_LOCK_FLAGS_RECLAIM 2
 287
 288 typedef struct V9fsFlock
 289 {
 290     uint8_t type;
 291     uint32_t flags;
 292     uint64_t start; /* absolute offset */
 293     uint64_t length;
 294     uint32_t proc_id;
 295     V9fsString client_id;
 296 } V9fsFlock;
 297
 298 typedef struct V9fsGetlock
 299 {
 300     uint8_t type;
 301     uint64_t start; /* absolute offset */
 302     uint64_t length;
 303     uint32_t proc_id;
 304     V9fsString client_id;
 305 } V9fsGetlock;
 306
 307 extern int open_fd_hw;
 308 extern int total_open_fd;
 309
 310 static inline void v9fs_path_write_lock(V9fsState *s)
 311 {
 312     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 313         qemu_co_rwlock_wrlock(&s->rename_lock);
 314     }
 315 }
 316
 317 static inline void v9fs_path_read_lock(V9fsState *s)
 318 {
 319     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 320         qemu_co_rwlock_rdlock(&s->rename_lock);
 321     }
 322 }
 323
 324 static inline void v9fs_path_unlock(V9fsState *s)
 325 {
 326     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 327         qemu_co_rwlock_unlock(&s->rename_lock);
 328     }
 329 }
 330
 331 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
 332 {
 333     return pdu->cancelled;
 334 }
 335
 336 void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu);
 337 void v9fs_path_init(V9fsPath *path);
 338 void v9fs_path_free(V9fsPath *path);
 339 void v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...);
 340 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
 341 int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
 342                       const char *name, V9fsPath *path);
 343 int v9fs_device_realize_common(V9fsState *s, Error **errp);
 344 void v9fs_device_unrealize_common(V9fsState *s, Error **errp);
 345
 346 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 347 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 348 V9fsPDU *pdu_alloc(V9fsState *s);
 349 void pdu_free(V9fsPDU *pdu);
 350 void pdu_submit(V9fsPDU *pdu);
 351 void v9fs_reset(V9fsState *s);
 352
 353 struct V9fsTransport {
 354     ssize_t     (*pdu_vmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
 355                                 va_list ap);
 356     ssize_t     (*pdu_vunmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
 357                                   va_list ap);
 358     void        (*init_in_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov,
 359                                         unsigned int *pniov, size_t size);
 360     void        (*init_out_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov,
 361                                          unsigned int *pniov);
 362     void        (*push_and_notify)(V9fsPDU *pdu);
 363 };
 364
 365 static inline int v9fs_register_transport(V9fsState *s,
 366         const struct V9fsTransport *t)
 367 {
 368     assert(!s->transport);
 369     s->transport = t;
 370     return 0;
 371 }
 372
 373 #endif