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    (u16)(~0)
 103 #define P9_NOFID    (u32)(~0)
 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 struct V9fsPDU
 123 {
 124     uint32_t size;
 125     uint16_t tag;
 126     uint8_t id;
 127     uint8_t cancelled;
 128     CoQueue complete;
 129     struct V9fsState *s;
 130     QLIST_ENTRY(V9fsPDU) next;
 131     uint32_t idx;
 132 };
 133
 134
 135 /* FIXME
 136  * 1) change user needs to set groups and stuff
 137  */
 138
 139 #define MAX_REQ         128
 140 #define MAX_TAG_LEN     32
 141
 142 #define BUG_ON(cond) assert(!(cond))
 143
 144 typedef struct V9fsFidState V9fsFidState;
 145
 146 enum {
 147     P9_FID_NONE = 0,
 148     P9_FID_FILE,
 149     P9_FID_DIR,
 150     P9_FID_XATTR,
 151 };
 152
 153 typedef struct V9fsConf
 154 {
 155     /* tag name for the device */
 156     char *tag;
 157     char *fsdev_id;
 158 } V9fsConf;
 159
 160 typedef struct V9fsXattr
 161 {
 162     int64_t copied_len;
 163     int64_t len;
 164     void *value;
 165     V9fsString name;
 166     int flags;
 167 } V9fsXattr;
 168
 169 typedef struct V9fsDir {
 170     DIR *stream;
 171     QemuMutex readdir_mutex;
 172 } V9fsDir;
 173
 174 static inline void v9fs_readdir_lock(V9fsDir *dir)
 175 {
 176     qemu_mutex_lock(&dir->readdir_mutex);
 177 }
 178
 179 static inline void v9fs_readdir_unlock(V9fsDir *dir)
 180 {
 181     qemu_mutex_unlock(&dir->readdir_mutex);
 182 }
 183
 184 static inline void v9fs_readdir_init(V9fsDir *dir)
 185 {
 186     qemu_mutex_init(&dir->readdir_mutex);
 187 }
 188
 189 /*
 190  * Filled by fs driver on open and other
 191  * calls.
 192  */
 193 union V9fsFidOpenState {
 194     int fd;
 195     V9fsDir dir;
 196     V9fsXattr xattr;
 197     /*
 198      * private pointer for fs drivers, that
 199      * have its own internal representation of
 200      * open files.
 201      */
 202     void *private;
 203 };
 204
 205 struct V9fsFidState
 206 {
 207     int fid_type;
 208     int32_t fid;
 209     V9fsPath path;
 210     V9fsFidOpenState fs;
 211     V9fsFidOpenState fs_reclaim;
 212     int flags;
 213     int open_flags;
 214     uid_t uid;
 215     int ref;
 216     int clunked;
 217     V9fsFidState *next;
 218     V9fsFidState *rclm_lst;
 219 };
 220
 221 typedef struct V9fsState
 222 {
 223     QLIST_HEAD(, V9fsPDU) free_list;
 224     QLIST_HEAD(, V9fsPDU) active_list;
 225     V9fsFidState *fid_list;
 226     FileOperations *ops;
 227     FsContext ctx;
 228     char *tag;
 229     enum p9_proto_version proto_version;
 230     int32_t msize;
 231     /*
 232      * lock ensuring atomic path update
 233      * on rename.
 234      */
 235     CoRwlock rename_lock;
 236     int32_t root_fid;
 237     Error *migration_blocker;
 238     V9fsConf fsconf;
 239 } V9fsState;
 240
 241 /* 9p2000.L open flags */
 242 #define P9_DOTL_RDONLY        00000000
 243 #define P9_DOTL_WRONLY        00000001
 244 #define P9_DOTL_RDWR          00000002
 245 #define P9_DOTL_NOACCESS      00000003
 246 #define P9_DOTL_CREATE        00000100
 247 #define P9_DOTL_EXCL          00000200
 248 #define P9_DOTL_NOCTTY        00000400
 249 #define P9_DOTL_TRUNC         00001000
 250 #define P9_DOTL_APPEND        00002000
 251 #define P9_DOTL_NONBLOCK      00004000
 252 #define P9_DOTL_DSYNC         00010000
 253 #define P9_DOTL_FASYNC        00020000
 254 #define P9_DOTL_DIRECT        00040000
 255 #define P9_DOTL_LARGEFILE     00100000
 256 #define P9_DOTL_DIRECTORY     00200000
 257 #define P9_DOTL_NOFOLLOW      00400000
 258 #define P9_DOTL_NOATIME       01000000
 259 #define P9_DOTL_CLOEXEC       02000000
 260 #define P9_DOTL_SYNC          04000000
 261
 262 /* 9p2000.L at flags */
 263 #define P9_DOTL_AT_REMOVEDIR         0x200
 264
 265 /* 9P2000.L lock type */
 266 #define P9_LOCK_TYPE_RDLCK 0
 267 #define P9_LOCK_TYPE_WRLCK 1
 268 #define P9_LOCK_TYPE_UNLCK 2
 269
 270 #define P9_LOCK_SUCCESS 0
 271 #define P9_LOCK_BLOCKED 1
 272 #define P9_LOCK_ERROR 2
 273 #define P9_LOCK_GRACE 3
 274
 275 #define P9_LOCK_FLAGS_BLOCK 1
 276 #define P9_LOCK_FLAGS_RECLAIM 2
 277
 278 typedef struct V9fsFlock
 279 {
 280     uint8_t type;
 281     uint32_t flags;
 282     uint64_t start; /* absolute offset */
 283     uint64_t length;
 284     uint32_t proc_id;
 285     V9fsString client_id;
 286 } V9fsFlock;
 287
 288 typedef struct V9fsGetlock
 289 {
 290     uint8_t type;
 291     uint64_t start; /* absolute offset */
 292     uint64_t length;
 293     uint32_t proc_id;
 294     V9fsString client_id;
 295 } V9fsGetlock;
 296
 297 extern int open_fd_hw;
 298 extern int total_open_fd;
 299
 300 static inline void v9fs_path_write_lock(V9fsState *s)
 301 {
 302     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 303         qemu_co_rwlock_wrlock(&s->rename_lock);
 304     }
 305 }
 306
 307 static inline void v9fs_path_read_lock(V9fsState *s)
 308 {
 309     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 310         qemu_co_rwlock_rdlock(&s->rename_lock);
 311     }
 312 }
 313
 314 static inline void v9fs_path_unlock(V9fsState *s)
 315 {
 316     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 317         qemu_co_rwlock_unlock(&s->rename_lock);
 318     }
 319 }
 320
 321 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
 322 {
 323     return pdu->cancelled;
 324 }
 325
 326 extern void v9fs_reclaim_fd(V9fsPDU *pdu);
 327 extern void v9fs_path_init(V9fsPath *path);
 328 extern void v9fs_path_free(V9fsPath *path);
 329 extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
 330 extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
 331                              const char *name, V9fsPath *path);
 332 extern int v9fs_device_realize_common(V9fsState *s, Error **errp);
 333 extern void v9fs_device_unrealize_common(V9fsState *s, Error **errp);
 334
 335 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 336 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 337 V9fsPDU *pdu_alloc(V9fsState *s);
 338 void pdu_free(V9fsPDU *pdu);
 339 void pdu_submit(V9fsPDU *pdu);
 340
 341 #endif