6 #include <sys/resource.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"
100 enum p9_proto_version {
101 V9FS_PROTO_2000U = 0x01,
102 V9FS_PROTO_2000L = 0x02,
105 #define P9_NOTAG (u16)(~0)
106 #define P9_NOFID (u32)(~0)
107 #define P9_MAXWELEM 16
109 #define FID_REFERENCED 0x1
110 #define FID_NON_RECLAIMABLE 0x2
111 static inline char *rpath(FsContext *ctx, const char *path)
113 return g_strdup_printf("%s/%s", ctx->fs_root, path);
117 * ample room for Twrite/Rread header
118 * size[4] Tread/Twrite tag[2] fid[4] offset[8] count[4]
120 #define P9_IOHDRSZ 24
122 typedef struct V9fsPDU V9fsPDU;
133 QLIST_ENTRY(V9fsPDU) next;
139 * 1) change user needs to set groups and stuff
143 #define MAX_TAG_LEN 32
145 #define BUG_ON(cond) assert(!(cond))
147 typedef struct V9fsFidState V9fsFidState;
156 typedef struct V9fsConf
158 /* tag name for the device */
163 typedef struct V9fsXattr
173 * Filled by fs driver on open and other
176 union V9fsFidOpenState {
181 * private pointer for fs drivers, that
182 * have its own internal representation of
194 V9fsFidOpenState fs_reclaim;
201 V9fsFidState *rclm_lst;
204 typedef struct V9fsState
206 QLIST_HEAD(, V9fsPDU) free_list;
207 QLIST_HEAD(, V9fsPDU) active_list;
208 V9fsFidState *fid_list;
212 enum p9_proto_version proto_version;
215 * lock ensuring atomic path update
218 CoRwlock rename_lock;
220 Error *migration_blocker;
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
245 /* 9p2000.L at flags */
246 #define P9_DOTL_AT_REMOVEDIR 0x200
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
253 #define P9_LOCK_SUCCESS 0
254 #define P9_LOCK_BLOCKED 1
255 #define P9_LOCK_ERROR 2
256 #define P9_LOCK_GRACE 3
258 #define P9_LOCK_FLAGS_BLOCK 1
259 #define P9_LOCK_FLAGS_RECLAIM 2
261 typedef struct V9fsFlock
265 uint64_t start; /* absolute offset */
268 V9fsString client_id;
271 typedef struct V9fsGetlock
274 uint64_t start; /* absolute offset */
277 V9fsString client_id;
280 extern int open_fd_hw;
281 extern int total_open_fd;
283 static inline void v9fs_path_write_lock(V9fsState *s)
285 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
286 qemu_co_rwlock_wrlock(&s->rename_lock);
290 static inline void v9fs_path_read_lock(V9fsState *s)
292 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
293 qemu_co_rwlock_rdlock(&s->rename_lock);
297 static inline void v9fs_path_unlock(V9fsState *s)
299 if (s->ctx.export_flags & V9FS_PATHNAME_FSCONTEXT) {
300 qemu_co_rwlock_unlock(&s->rename_lock);
304 static inline uint8_t v9fs_request_cancelled(V9fsPDU *pdu)
306 return pdu->cancelled;
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);
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);