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1 /*
2 * 9p backend
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
8 * Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com>
9 *
10 * This work is licensed under the terms of the GNU GPL, version 2. See
11 * the COPYING file in the top-level directory.
12 *
13 */
14
15 #ifndef QEMU_9P_COTH_H
16 #define QEMU_9P_COTH_H
17
18 #include "qemu/thread.h"
19 #include "qemu/coroutine-core.h"
20 #include "9p.h"
21
22 /*
23 * we want to use bottom half because we want to make sure the below
24 * sequence of events.
25 *
26 * 1. Yield the coroutine in the QEMU thread.
27 * 2. Submit the coroutine to a worker thread.
28 * 3. Enter the coroutine in the worker thread.
29 * we cannot swap step 1 and 2, because that would imply worker thread
30 * can enter coroutine while step1 is still running
31 *
32 * PERFORMANCE CONSIDERATIONS: As a rule of thumb, keep in mind
33 * that hopping between threads adds @b latency! So when handling a
34 * 9pfs request, avoid calling v9fs_co_run_in_worker() too often, because
35 * this might otherwise sum up to a significant, huge overall latency for
36 * providing the response for just a single request. For that reason it
37 * is highly recommended to fetch all data from fs driver with a single
38 * fs driver request on a background I/O thread (bottom half) in one rush
39 * first and then eventually assembling the final response from that data
40 * on main I/O thread (top half).
41 */
42 #define v9fs_co_run_in_worker(code_block) \
43 do { \
44 QEMUBH *co_bh; \
45 co_bh = qemu_bh_new(co_run_in_worker_bh, \
46 qemu_coroutine_self()); \
47 qemu_bh_schedule(co_bh); \
48 /* \
49 * yield in qemu thread and re-enter back \
50 * in worker thread \
51 */ \
52 qemu_coroutine_yield(); \
53 qemu_bh_delete(co_bh); \
54 do { \
55 code_block; \
56 } while (0); \
57 /* re-enter back to qemu thread */ \
58 qemu_coroutine_yield(); \
59 } while (0)
60
61 void co_run_in_worker_bh(void *);
62 int coroutine_fn v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *);
63 int coroutine_fn v9fs_co_readdir(V9fsPDU *, V9fsFidState *, struct dirent **);
64 int coroutine_fn v9fs_co_readdir_many(V9fsPDU *, V9fsFidState *,
65 struct V9fsDirEnt **, off_t, int32_t,
66 bool);
67 off_t coroutine_fn v9fs_co_telldir(V9fsPDU *, V9fsFidState *);
68 void coroutine_fn v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t);
69 void coroutine_fn v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *);
70 int coroutine_fn v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *);
71 int coroutine_fn v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *);
72 int coroutine_fn v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t);
73 int coroutine_fn v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]);
74 int coroutine_fn v9fs_co_futimens(V9fsPDU *pdu, V9fsFidState *fidp,
75 struct timespec times[2]);
76 int coroutine_fn v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t);
77 int coroutine_fn v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t);
78 int coroutine_fn v9fs_co_ftruncate(V9fsPDU *pdu, V9fsFidState *fidp,
79 off_t size);
80 int coroutine_fn v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t);
81 int coroutine_fn v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *,
82 V9fsString *, void *, size_t);
83 int coroutine_fn v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t,
84 gid_t, dev_t, mode_t, struct stat *);
85 int coroutine_fn v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *,
86 mode_t, uid_t, gid_t, struct stat *);
87 int coroutine_fn v9fs_co_remove(V9fsPDU *, V9fsPath *);
88 int coroutine_fn v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *);
89 int coroutine_fn v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *,
90 int flags);
91 int coroutine_fn v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *,
92 V9fsPath *, V9fsString *);
93 int coroutine_fn v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *);
94 int coroutine_fn v9fs_co_opendir(V9fsPDU *, V9fsFidState *);
95 int coroutine_fn v9fs_co_open(V9fsPDU *, V9fsFidState *, int);
96 int coroutine_fn v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *,
97 gid_t, int, int, struct stat *);
98 int coroutine_fn v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *,
99 void *, size_t, int);
100 int coroutine_fn v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *);
101 int coroutine_fn v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *);
102 int coroutine_fn v9fs_co_close(V9fsPDU *, V9fsFidOpenState *);
103 int coroutine_fn v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int);
104 int coroutine_fn v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *,
105 const char *, gid_t, struct stat *);
106 int coroutine_fn v9fs_co_link(V9fsPDU *, V9fsFidState *,
107 V9fsFidState *, V9fsString *);
108 int coroutine_fn v9fs_co_pwritev(V9fsPDU *, V9fsFidState *,
109 struct iovec *, int, int64_t);
110 int coroutine_fn v9fs_co_preadv(V9fsPDU *, V9fsFidState *,
111 struct iovec *, int, int64_t);
112 int coroutine_fn v9fs_co_name_to_path(V9fsPDU *, V9fsPath *,
113 const char *, V9fsPath *);
114 int coroutine_fn v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t,
115 V9fsStatDotl *v9stat);
116
117 #endif