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.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 #define v9fs_co_run_in_worker(code_block) \ 33 do { \ 34 QEMUBH *co_bh; \ 35 co_bh = qemu_bh_new(co_run_in_worker_bh, \ 36 qemu_coroutine_self()); \ 37 qemu_bh_schedule(co_bh); \ 38 /* \ 39 * yield in qemu thread and re-enter back \ 40 * in worker thread \ 41 */ \ 42 qemu_coroutine_yield(); \ 43 qemu_bh_delete(co_bh); \ 44 code_block; \ 45 /* re-enter back to qemu thread */ \ 46 qemu_coroutine_yield(); \ 47 } while (0) 48 49 void co_run_in_worker_bh(void *); 50 int coroutine_fn v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *); 51 int coroutine_fn v9fs_co_readdir(V9fsPDU *, V9fsFidState *, struct dirent **); 52 off_t coroutine_fn v9fs_co_telldir(V9fsPDU *, V9fsFidState *); 53 void coroutine_fn v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t); 54 void coroutine_fn v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *); 55 int coroutine_fn v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *); 56 int coroutine_fn v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *); 57 int coroutine_fn v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t); 58 int coroutine_fn v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]); 59 int coroutine_fn v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t); 60 int coroutine_fn v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t); 61 int coroutine_fn v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t); 62 int coroutine_fn v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *, 63 V9fsString *, void *, size_t); 64 int coroutine_fn v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t, 65 gid_t, dev_t, mode_t, struct stat *); 66 int coroutine_fn v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *, 67 mode_t, uid_t, gid_t, struct stat *); 68 int coroutine_fn v9fs_co_remove(V9fsPDU *, V9fsPath *); 69 int coroutine_fn v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *); 70 int coroutine_fn v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *, 71 int flags); 72 int coroutine_fn v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *, 73 V9fsPath *, V9fsString *); 74 int coroutine_fn v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *); 75 int coroutine_fn v9fs_co_opendir(V9fsPDU *, V9fsFidState *); 76 int coroutine_fn v9fs_co_open(V9fsPDU *, V9fsFidState *, int); 77 int coroutine_fn v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *, 78 gid_t, int, int, struct stat *); 79 int coroutine_fn v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *, 80 void *, size_t, int); 81 int coroutine_fn v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *); 82 int coroutine_fn v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *); 83 int coroutine_fn v9fs_co_close(V9fsPDU *, V9fsFidOpenState *); 84 int coroutine_fn v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int); 85 int coroutine_fn v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *, 86 const char *, gid_t, struct stat *); 87 int coroutine_fn v9fs_co_link(V9fsPDU *, V9fsFidState *, 88 V9fsFidState *, V9fsString *); 89 int coroutine_fn v9fs_co_pwritev(V9fsPDU *, V9fsFidState *, 90 struct iovec *, int, int64_t); 91 int coroutine_fn v9fs_co_preadv(V9fsPDU *, V9fsFidState *, 92 struct iovec *, int, int64_t); 93 int coroutine_fn v9fs_co_name_to_path(V9fsPDU *, V9fsPath *, 94 const char *, V9fsPath *); 95 int coroutine_fn v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t, 96 V9fsStatDotl *v9stat); 97 98 #endif 99