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"
97 enum p9_proto_version {
98 V9FS_PROTO_2000U = 0x01,
99 V9FS_PROTO_2000L = 0x02,
102 #define P9_NOTAG UINT16_MAX
103 #define P9_NOFID UINT32_MAX
104 #define P9_MAXWELEM 16
106 #define FID_REFERENCED 0x1
107 #define FID_NON_RECLAIMABLE 0x2
108 static inline char *rpath(FsContext *ctx, const char *path)
110 return g_strdup_printf("%s/%s", ctx->fs_root, path);
114 * ample room for Twrite/Rread header
115 * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
117 #define P9_IOHDRSZ 24
119 typedef struct V9fsPDU V9fsPDU;
126 } QEMU_PACKED P9MsgHeader;
136 QLIST_ENTRY(V9fsPDU) next;
142 * 1) change user needs to set groups and stuff
146 #define MAX_TAG_LEN 32
148 #define BUG_ON(cond) assert(!(cond))
150 typedef struct V9fsFidState V9fsFidState;
159 typedef struct V9fsConf
161 /* tag name for the device */
166 typedef struct V9fsXattr
176 typedef struct V9fsDir {
178 QemuMutex readdir_mutex;
181 static inline void v9fs_readdir_lock(V9fsDir *dir)
183 qemu_mutex_lock(&dir->readdir_mutex);
186 static inline void v9fs_readdir_unlock(V9fsDir *dir)
188 qemu_mutex_unlock(&dir->readdir_mutex);
191 static inline void v9fs_readdir_init(V9fsDir *dir)
193 qemu_mutex_init(&dir->readdir_mutex);
197 * Filled by fs driver on open and other
200 union V9fsFidOpenState {
205 * private pointer for fs drivers, that
206 * have its own internal representation of
218 V9fsFidOpenState fs_reclaim;
225 V9fsFidState *rclm_lst;
228 typedef struct V9fsState
230 QLIST_HEAD(, V9fsPDU) free_list;
231 QLIST_HEAD(, V9fsPDU) active_list;
232 V9fsFidState *fid_list;
236 enum p9_proto_version proto_version;
238 V9fsPDU pdus[MAX_REQ];
239 const struct V9fsTransport *transport;
241 * lock ensuring atomic path update
244 CoRwlock rename_lock;
246 Error *migration_blocker;
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
272 /* 9p2000.L at flags */
273 #define P9_DOTL_AT_REMOVEDIR 0x200
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
280 #define P9_LOCK_SUCCESS 0
281 #define P9_LOCK_BLOCKED 1
282 #define P9_LOCK_ERROR 2
283 #define P9_LOCK_GRACE 3
285 #define P9_LOCK_FLAGS_BLOCK 1
286 #define P9_LOCK_FLAGS_RECLAIM 2
288 typedef struct V9fsFlock
292 uint64_t start; /* absolute offset */
295 V9fsString client_id;
298 typedef struct V9fsGetlock
301 uint64_t start; /* absolute offset */
304 V9fsString client_id;
307 extern int open_fd_hw;
308 extern int total_open_fd;
310 static inline void v9fs_path_write_lock(V9fsState *s)
312 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
313 qemu_co_rwlock_wrlock(&s->rename_lock);
317 static inline void v9fs_path_read_lock(V9fsState *s)
319 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
320 qemu_co_rwlock_rdlock(&s->rename_lock);
324 static inline void v9fs_path_unlock(V9fsState *s)
326 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
327 qemu_co_rwlock_unlock(&s->rename_lock);
331 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
333 return pdu->cancelled;
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);
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, P9MsgHeader *hdr);
351 void v9fs_reset(V9fsState *s);
353 struct V9fsTransport {
354 ssize_t (*pdu_vmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
356 ssize_t (*pdu_vunmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
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);
365 static inline int v9fs_register_transport(V9fsState *s,
366 const struct V9fsTransport *t)
368 assert(!s->transport);