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 <glib.h>
   8 #include "standard-headers/linux/virtio_9p.h"
   9 #include "hw/virtio/virtio.h"
  10 #include "fsdev/file-op-9p.h"
  11 #include "fsdev/9p-iov-marshal.h"
  12 #include "qemu/thread.h"
  13 #include "qemu/coroutine.h"
  14
  15 enum {
  16     P9_TLERROR = 6,
  17     P9_RLERROR,
  18     P9_TSTATFS = 8,
  19     P9_RSTATFS,
  20     P9_TLOPEN = 12,
  21     P9_RLOPEN,
  22     P9_TLCREATE = 14,
  23     P9_RLCREATE,
  24     P9_TSYMLINK = 16,
  25     P9_RSYMLINK,
  26     P9_TMKNOD = 18,
  27     P9_RMKNOD,
  28     P9_TRENAME = 20,
  29     P9_RRENAME,
  30     P9_TREADLINK = 22,
  31     P9_RREADLINK,
  32     P9_TGETATTR = 24,
  33     P9_RGETATTR,
  34     P9_TSETATTR = 26,
  35     P9_RSETATTR,
  36     P9_TXATTRWALK = 30,
  37     P9_RXATTRWALK,
  38     P9_TXATTRCREATE = 32,
  39     P9_RXATTRCREATE,
  40     P9_TREADDIR = 40,
  41     P9_RREADDIR,
  42     P9_TFSYNC = 50,
  43     P9_RFSYNC,
  44     P9_TLOCK = 52,
  45     P9_RLOCK,
  46     P9_TGETLOCK = 54,
  47     P9_RGETLOCK,
  48     P9_TLINK = 70,
  49     P9_RLINK,
  50     P9_TMKDIR = 72,
  51     P9_RMKDIR,
  52     P9_TRENAMEAT = 74,
  53     P9_RRENAMEAT,
  54     P9_TUNLINKAT = 76,
  55     P9_RUNLINKAT,
  56     P9_TVERSION = 100,
  57     P9_RVERSION,
  58     P9_TAUTH = 102,
  59     P9_RAUTH,
  60     P9_TATTACH = 104,
  61     P9_RATTACH,
  62     P9_TERROR = 106,
  63     P9_RERROR,
  64     P9_TFLUSH = 108,
  65     P9_RFLUSH,
  66     P9_TWALK = 110,
  67     P9_RWALK,
  68     P9_TOPEN = 112,
  69     P9_ROPEN,
  70     P9_TCREATE = 114,
  71     P9_RCREATE,
  72     P9_TREAD = 116,
  73     P9_RREAD,
  74     P9_TWRITE = 118,
  75     P9_RWRITE,
  76     P9_TCLUNK = 120,
  77     P9_RCLUNK,
  78     P9_TREMOVE = 122,
  79     P9_RREMOVE,
  80     P9_TSTAT = 124,
  81     P9_RSTAT,
  82     P9_TWSTAT = 126,
  83     P9_RWSTAT,
  84 };
  85
  86
  87 /* qid.types */
  88 enum {
  89     P9_QTDIR = 0x80,
  90     P9_QTAPPEND = 0x40,
  91     P9_QTEXCL = 0x20,
  92     P9_QTMOUNT = 0x10,
  93     P9_QTAUTH = 0x08,
  94     P9_QTTMP = 0x04,
  95     P9_QTSYMLINK = 0x02,
  96     P9_QTLINK = 0x01,
  97     P9_QTFILE = 0x00,
  98 };
  99
 100 enum p9_proto_version {
 101     V9FS_PROTO_2000U = 0x01,
 102     V9FS_PROTO_2000L = 0x02,
 103 };
 104
 105 #define P9_NOTAG    (u16)(~0)
 106 #define P9_NOFID    (u32)(~0)
 107 #define P9_MAXWELEM 16
 108
 109 #define FID_REFERENCED          0x1
 110 #define FID_NON_RECLAIMABLE     0x2
 111 static inline char *rpath(FsContext *ctx, const char *path)
 112 {
 113     return g_strdup_printf("%s/%s", ctx->fs_root, path);
 114 }
 115
 116 /*
 117  * ample room for Twrite/Rread header
 118  * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
 119  */
 120 #define P9_IOHDRSZ 24
 121
 122 typedef struct V9fsPDU V9fsPDU;
 123 struct V9fsState;
 124
 125 struct V9fsPDU
 126 {
 127     uint32_t size;
 128     uint16_t tag;
 129     uint8_t id;
 130     uint8_t cancelled;
 131     CoQueue complete;
 132     struct V9fsState *s;
 133     QLIST_ENTRY(V9fsPDU) next;
 134     uint32_t idx;
 135 };
 136
 137
 138 /* FIXME
 139  * 1) change user needs to set groups and stuff
 140  */
 141
 142 #define MAX_REQ         128
 143 #define MAX_TAG_LEN     32
 144
 145 #define BUG_ON(cond) assert(!(cond))
 146
 147 typedef struct V9fsFidState V9fsFidState;
 148
 149 enum {
 150     P9_FID_NONE = 0,
 151     P9_FID_FILE,
 152     P9_FID_DIR,
 153     P9_FID_XATTR,
 154 };
 155
 156 typedef struct V9fsConf
 157 {
 158     /* tag name for the device */
 159     char *tag;
 160     char *fsdev_id;
 161 } V9fsConf;
 162
 163 typedef struct V9fsXattr
 164 {
 165     int64_t copied_len;
 166     int64_t len;
 167     void *value;
 168     V9fsString name;
 169     int flags;
 170 } V9fsXattr;
 171
 172 /*
 173  * Filled by fs driver on open and other
 174  * calls.
 175  */
 176 union V9fsFidOpenState {
 177     int fd;
 178     DIR *dir;
 179     V9fsXattr xattr;
 180     /*
 181      * private pointer for fs drivers, that
 182      * have its own internal representation of
 183      * open files.
 184      */
 185     void *private;
 186 };
 187
 188 struct V9fsFidState
 189 {
 190     int fid_type;
 191     int32_t fid;
 192     V9fsPath path;
 193     V9fsFidOpenState fs;
 194     V9fsFidOpenState fs_reclaim;
 195     int flags;
 196     int open_flags;
 197     uid_t uid;
 198     int ref;
 199     int clunked;
 200     V9fsFidState *next;
 201     V9fsFidState *rclm_lst;
 202 };
 203
 204 typedef struct V9fsState
 205 {
 206     QLIST_HEAD(, V9fsPDU) free_list;
 207     QLIST_HEAD(, V9fsPDU) active_list;
 208     V9fsFidState *fid_list;
 209     FileOperations *ops;
 210     FsContext ctx;
 211     char *tag;
 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 /* 9p2000.L open flags */
 225 #define P9_DOTL_RDONLY        00000000
 226 #define P9_DOTL_WRONLY        00000001
 227 #define P9_DOTL_RDWR          00000002
 228 #define P9_DOTL_NOACCESS      00000003
 229 #define P9_DOTL_CREATE        00000100
 230 #define P9_DOTL_EXCL          00000200
 231 #define P9_DOTL_NOCTTY        00000400
 232 #define P9_DOTL_TRUNC         00001000
 233 #define P9_DOTL_APPEND        00002000
 234 #define P9_DOTL_NONBLOCK      00004000
 235 #define P9_DOTL_DSYNC         00010000
 236 #define P9_DOTL_FASYNC        00020000
 237 #define P9_DOTL_DIRECT        00040000
 238 #define P9_DOTL_LARGEFILE     00100000
 239 #define P9_DOTL_DIRECTORY     00200000
 240 #define P9_DOTL_NOFOLLOW      00400000
 241 #define P9_DOTL_NOATIME       01000000
 242 #define P9_DOTL_CLOEXEC       02000000
 243 #define P9_DOTL_SYNC          04000000
 244
 245 /* 9p2000.L at flags */
 246 #define P9_DOTL_AT_REMOVEDIR         0x200
 247
 248 /* 9P2000.L lock type */
 249 #define P9_LOCK_TYPE_RDLCK 0
 250 #define P9_LOCK_TYPE_WRLCK 1
 251 #define P9_LOCK_TYPE_UNLCK 2
 252
 253 #define P9_LOCK_SUCCESS 0
 254 #define P9_LOCK_BLOCKED 1
 255 #define P9_LOCK_ERROR 2
 256 #define P9_LOCK_GRACE 3
 257
 258 #define P9_LOCK_FLAGS_BLOCK 1
 259 #define P9_LOCK_FLAGS_RECLAIM 2
 260
 261 typedef struct V9fsFlock
 262 {
 263     uint8_t type;
 264     uint32_t flags;
 265     uint64_t start; /* absolute offset */
 266     uint64_t length;
 267     uint32_t proc_id;
 268     V9fsString client_id;
 269 } V9fsFlock;
 270
 271 typedef struct V9fsGetlock
 272 {
 273     uint8_t type;
 274     uint64_t start; /* absolute offset */
 275     uint64_t length;
 276     uint32_t proc_id;
 277     V9fsString client_id;
 278 } V9fsGetlock;
 279
 280 extern int open_fd_hw;
 281 extern int total_open_fd;
 282
 283 static inline void v9fs_path_write_lock(V9fsState *s)
 284 {
 285     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 286         qemu_co_rwlock_wrlock(&s->rename_lock);
 287     }
 288 }
 289
 290 static inline void v9fs_path_read_lock(V9fsState *s)
 291 {
 292     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 293         qemu_co_rwlock_rdlock(&s->rename_lock);
 294     }
 295 }
 296
 297 static inline void v9fs_path_unlock(V9fsState *s)
 298 {
 299     if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
 300         qemu_co_rwlock_unlock(&s->rename_lock);
 301     }
 302 }
 303
 304 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
 305 {
 306     return pdu->cancelled;
 307 }
 308
 309 extern void v9fs_reclaim_fd(V9fsPDU *pdu);
 310 extern void v9fs_path_init(V9fsPath *path);
 311 extern void v9fs_path_free(V9fsPath *path);
 312 extern void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
 313 extern int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
 314                              const char *name, V9fsPath *path);
 315 extern int v9fs_device_realize_common(V9fsState *s, Error **errp);
 316 extern void v9fs_device_unrealize_common(V9fsState *s, Error **errp);
 317
 318 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 319 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
 320 V9fsPDU *pdu_alloc(V9fsState *s);
 321 void pdu_free(V9fsPDU *pdu);
 322 void pdu_submit(V9fsPDU *pdu);
 323
 324 #endif