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 (u16)(~0)
103 #define P9_NOFID (u32)(~0)
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;
130 QLIST_ENTRY(V9fsPDU) next;
136 * 1) change user needs to set groups and stuff
140 #define MAX_TAG_LEN 32
142 #define BUG_ON(cond) assert(!(cond))
144 typedef struct V9fsFidState V9fsFidState;
153 typedef struct V9fsConf
155 /* tag name for the device */
160 typedef struct V9fsXattr
170 typedef struct V9fsDir {
172 QemuMutex readdir_mutex;
175 static inline void v9fs_readdir_lock(V9fsDir *dir)
177 qemu_mutex_lock(&dir->readdir_mutex);
180 static inline void v9fs_readdir_unlock(V9fsDir *dir)
182 qemu_mutex_unlock(&dir->readdir_mutex);
185 static inline void v9fs_readdir_init(V9fsDir *dir)
187 qemu_mutex_init(&dir->readdir_mutex);
191 * Filled by fs driver on open and other
194 union V9fsFidOpenState {
199 * private pointer for fs drivers, that
200 * have its own internal representation of
212 V9fsFidOpenState fs_reclaim;
219 V9fsFidState *rclm_lst;
222 typedef struct V9fsState
224 QLIST_HEAD(, V9fsPDU) free_list;
225 QLIST_HEAD(, V9fsPDU) active_list;
226 V9fsFidState *fid_list;
230 enum p9_proto_version proto_version;
232 V9fsPDU pdus[MAX_REQ];
233 const struct V9fsTransport *transport;
235 * lock ensuring atomic path update
238 CoRwlock rename_lock;
240 Error *migration_blocker;
245 /* 9p2000.L open flags */
246 #define P9_DOTL_RDONLY 00000000
247 #define P9_DOTL_WRONLY 00000001
248 #define P9_DOTL_RDWR 00000002
249 #define P9_DOTL_NOACCESS 00000003
250 #define P9_DOTL_CREATE 00000100
251 #define P9_DOTL_EXCL 00000200
252 #define P9_DOTL_NOCTTY 00000400
253 #define P9_DOTL_TRUNC 00001000
254 #define P9_DOTL_APPEND 00002000
255 #define P9_DOTL_NONBLOCK 00004000
256 #define P9_DOTL_DSYNC 00010000
257 #define P9_DOTL_FASYNC 00020000
258 #define P9_DOTL_DIRECT 00040000
259 #define P9_DOTL_LARGEFILE 00100000
260 #define P9_DOTL_DIRECTORY 00200000
261 #define P9_DOTL_NOFOLLOW 00400000
262 #define P9_DOTL_NOATIME 01000000
263 #define P9_DOTL_CLOEXEC 02000000
264 #define P9_DOTL_SYNC 04000000
266 /* 9p2000.L at flags */
267 #define P9_DOTL_AT_REMOVEDIR 0x200
269 /* 9P2000.L lock type */
270 #define P9_LOCK_TYPE_RDLCK 0
271 #define P9_LOCK_TYPE_WRLCK 1
272 #define P9_LOCK_TYPE_UNLCK 2
274 #define P9_LOCK_SUCCESS 0
275 #define P9_LOCK_BLOCKED 1
276 #define P9_LOCK_ERROR 2
277 #define P9_LOCK_GRACE 3
279 #define P9_LOCK_FLAGS_BLOCK 1
280 #define P9_LOCK_FLAGS_RECLAIM 2
282 typedef struct V9fsFlock
286 uint64_t start; /* absolute offset */
289 V9fsString client_id;
292 typedef struct V9fsGetlock
295 uint64_t start; /* absolute offset */
298 V9fsString client_id;
301 extern int open_fd_hw;
302 extern int total_open_fd;
304 static inline void v9fs_path_write_lock(V9fsState *s)
306 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
307 qemu_co_rwlock_wrlock(&s->rename_lock);
311 static inline void v9fs_path_read_lock(V9fsState *s)
313 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
314 qemu_co_rwlock_rdlock(&s->rename_lock);
318 static inline void v9fs_path_unlock(V9fsState *s)
320 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
321 qemu_co_rwlock_unlock(&s->rename_lock);
325 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
327 return pdu->cancelled;
330 void coroutine_fn v9fs_reclaim_fd(V9fsPDU *pdu);
331 void v9fs_path_init(V9fsPath *path);
332 void v9fs_path_free(V9fsPath *path);
333 void v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...);
334 void v9fs_path_copy(V9fsPath *lhs, V9fsPath *rhs);
335 int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
336 const char *name, V9fsPath *path);
337 int v9fs_device_realize_common(V9fsState *s, Error **errp);
338 void v9fs_device_unrealize_common(V9fsState *s, Error **errp);
340 ssize_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
341 ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...);
342 V9fsPDU *pdu_alloc(V9fsState *s);
343 void pdu_free(V9fsPDU *pdu);
344 void pdu_submit(V9fsPDU *pdu);
345 void v9fs_reset(V9fsState *s);
347 struct V9fsTransport {
348 ssize_t (*pdu_vmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
350 ssize_t (*pdu_vunmarshal)(V9fsPDU *pdu, size_t offset, const char *fmt,
352 void (*init_iov_from_pdu)(V9fsPDU *pdu, struct iovec **piov,
353 unsigned int *pniov, bool is_write);
354 void (*push_and_notify)(V9fsPDU *pdu);
357 static inline int v9fs_register_transport(V9fsState *s,
358 const struct V9fsTransport *t)
360 assert(!s->transport);