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 typedef struct V9fsState V9fsState;
 121
 122 typedef struct {
 123     uint32_t size_le;
 124     uint8_t id;
 125     uint16_t tag_le;
 126 } QEMU_PACKED P9MsgHeader;
 127 /* According to the specification, 9p messages start with a 7-byte header.
 128  * Since most of the code uses this header size in literal form, we must be
 129  * sure this is indeed the case.
 130  */
 131 QEMU_BUILD_BUG_ON(sizeof(P9MsgHeader) != 7);
 132
 133 struct V9fsPDU
 134 {
 135     uint32_t size;
 136     uint16_t tag;
 137     uint8_t id;
 138     uint8_t cancelled;
 139     CoQueue complete;
 140     V9fsState *s;
 141     QLIST_ENTRY(V9fsPDU) next;
 142     uint32_t idx;
 143 };
 144
 145
 146 /* FIXME
 147  * 1) change user needs to set groups and stuff
 148  */
 149
 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 enum {
 158     P9_FID_NONE = 0,
 159     P9_FID_FILE,
 160     P9_FID_DIR,
 161     P9_FID_XATTR,
 162 };
 163
 164 typedef struct V9fsConf
 165 {
 166     /* tag name for the device */
 167     char *tag;
 168     char *fsdev_id;
 169 } V9fsConf;
 170
 171 typedef struct V9fsXattr
 172 {
 173     uint64_t copied_len;
 174     uint64_t len;
 175     void *value;
 176     V9fsString name;
 177     int flags;
 178     bool xattrwalk_fid;
 179 } V9fsXattr;
 180
 181 typedef struct V9fsDir {
 182     DIR *stream;
 183     QemuMutex readdir_mutex;
 184 } V9fsDir;
 185
 186 static inline void v9fs_readdir_lock(V9fsDir *dir)
 187 {
 188     qemu_mutex_lock(&dir->readdir_mutex);
 189 }
 190
 191 static inline void v9fs_readdir_unlock(V9fsDir *dir)
 192 {
 193     qemu_mutex_unlock(&dir->readdir_mutex);
 194 }
 195
 196 static inline void v9fs_readdir_init(V9fsDir *dir)
 197 {
 198     qemu_mutex_init(&dir->readdir_mutex);
 199 }
 200
 201 /*
 202  * Filled by fs driver on open and other
 203  * calls.
 204  */
 205 union V9fsFidOpenState {
 206     int fd;
 207     V9fsDir dir;
 208     V9fsXattr xattr;
 209     /*
 210      * private pointer for fs drivers, that
 211      * have its own internal representation of
 212      * open files.
 213      */
 214     void *private;
 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 struct V9fsState
 234 {
 235     QLIST_HEAD(, V9fsPDU) free_list;
 236     QLIST_HEAD(, V9fsPDU) active_list;
 237     V9fsFidState *fid_list;
 238     FileOperations *ops;
 239     FsContext ctx;
 240     char *tag;
 241     enum p9_proto_version proto_version;
 242     int32_t msize;
 243     V9fsPDU pdus[MAX_REQ];
 244     const struct V9fsTransport *transport;
 245     /*
 246      * lock ensuring atomic path update
 247      * on rename.
 248      */
 249     CoRwlock rename_lock;
 250     int32_t root_fid;
 251     Error *migration_blocker;
 252     V9fsConf fsconf;
 253     V9fsQID root_qid;
 254 };
 255
 256 /* 9p2000.L open flags */
 257 #define P9_DOTL_RDONLY        00000000
 258 #define P9_DOTL_WRONLY        00000001
 259 #define P9_DOTL_RDWR          00000002
 260 #define P9_DOTL_NOACCESS      00000003
 261 #define P9_DOTL_CREATE        00000100
 262 #define P9_DOTL_EXCL          00000200
 263 #define P9_DOTL_NOCTTY        00000400
 264 #define P9_DOTL_TRUNC         00001000
 265 #define P9_DOTL_APPEND        00002000
 266 #define P9_DOTL_NONBLOCK      00004000
 267 #define P9_DOTL_DSYNC         00010000
 268 #define P9_DOTL_FASYNC        00020000
 269 #define P9_DOTL_DIRECT        00040000
 270 #define P9_DOTL_LARGEFILE     00100000
 271 #define P9_DOTL_DIRECTORY     00200000
 272 #define P9_DOTL_NOFOLLOW      00400000
 273 #define P9_DOTL_NOATIME       01000000
 274 #define P9_DOTL_CLOEXEC       02000000
 275 #define P9_DOTL_SYNC          04000000
 276
 277 /* 9p2000.L at flags */
 278 #define P9_DOTL_AT_REMOVEDIR         0x200
 279
 280 /* 9P2000.L lock type */
 281 #define P9_LOCK_TYPE_RDLCK 0
 282 #define P9_LOCK_TYPE_WRLCK 1
 283 #define P9_LOCK_TYPE_UNLCK 2
 284
 285 #define P9_LOCK_SUCCESS 0
 286 #define P9_LOCK_BLOCKED 1
 287 #define P9_LOCK_ERROR 2
 288 #define P9_LOCK_GRACE 3
 289
 290 #define P9_LOCK_FLAGS_BLOCK 1
 291 #define P9_LOCK_FLAGS_RECLAIM 2
 292
 293 typedef struct V9fsFlock
 294 {
 295     uint8_t type;
 296     uint32_t flags;
 297     uint64_t start; /* absolute offset */
 298     uint64_t length;
 299     uint32_t proc_id;
 300     V9fsString client_id;
 301 } V9fsFlock;
 302
 303 typedef struct V9fsGetlock
 304 {
 305     uint8_t type;
 306     uint64_t start; /* absolute offset */
 307     uint64_t length;
 308     uint32_t proc_id;
 309     V9fsString client_id;
 310 } V9fsGetlock;
 311
 312 extern int open_fd_hw;
 313 extern int total_open_fd;
 314
 315 static inline void v9fs_path_write_lock(V9fsState *s)
 316 {
 317     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 318         qemu_co_rwlock_wrlock(&s->rename_lock);
 319     }
 320 }
 321
 322 static inline void v9fs_path_read_lock(V9fsState *s)
 323 {
 324     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 325         qemu_co_rwlock_rdlock(&s->rename_lock);
 326     }
 327 }
 328
 329 static inline void v9fs_path_unlock(V9fsState *s)
 330 {
 331     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 332         qemu_co_rwlock_unlock(&s->rename_lock);
 333     }
 334 }
 335
 336 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
 337 {
 338     return pdu->cancelled;
 339 }
 340
 341 void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu);
 342 void v9fs_path_init(V9fsPath *path);
 343 void v9fs_path_free(V9fsPath *path);
 344 void v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...);
 345 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
 346 int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
 347                       const char *name, V9fsPath *path);
 348 int v9fs_device_realize_common(V9fsState *s, Error **errp);
 349 void v9fs_device_unrealize_common(V9fsState *s, Error **errp);
 350
 351 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 352 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 353 V9fsPDU *pdu_alloc(V9fsState *s);
 354 void pdu_free(V9fsPDU *pdu);
 355 void pdu_submit(V9fsPDU *pdu, P9MsgHeader *hdr);
 356 void v9fs_reset(V9fsState *s);
 357
 358 struct V9fsTransport {
 359     ssize_t     (*pdu_vmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
 360                                 va_list ap);
 361     ssize_t     (*pdu_vunmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
 362                                   va_list ap);
 363     void        (*init_in_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov,
 364                                         unsigned int *pniov, size_t size);
 365     void        (*init_out_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov,
 366                                          unsigned int *pniov, size_t size);
 367     void        (*push_and_notify)(V9fsPDU *pdu);
 368 };
 369
 370 static inline int v9fs_register_transport(V9fsState *s,
 371         const struct V9fsTransport *t)
 372 {
 373     assert(!s->transport);
 374     s->transport = t;
 375     return 0;
 376 }
 377
 378 #endif