1fe52840cSWei Liu /* 2fe52840cSWei Liu * 9p backend 3fe52840cSWei Liu * 4fe52840cSWei Liu * Copyright IBM, Corp. 2010 5fe52840cSWei Liu * 6fe52840cSWei Liu * Authors: 7fe52840cSWei Liu * Harsh Prateek Bora <harsh@linux.vnet.ibm.com> 8fe52840cSWei Liu * Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com> 9fe52840cSWei Liu * 10fe52840cSWei Liu * This work is licensed under the terms of the GNU GPL, version 2. See 11fe52840cSWei Liu * the COPYING file in the top-level directory. 12fe52840cSWei Liu * 13fe52840cSWei Liu */ 14fe52840cSWei Liu 152a6a4076SMarkus Armbruster #ifndef QEMU_9P_COTH_H 162a6a4076SMarkus Armbruster #define QEMU_9P_COTH_H 17fe52840cSWei Liu 18fe52840cSWei Liu #include "qemu/thread.h" 19*68ba85ceSMarkus Armbruster #include "qemu/coroutine-core.h" 20af8b38b0SGreg Kurz #include "9p.h" 21fe52840cSWei Liu 2209d19d58SChristian Schoenebeck /* 23fe52840cSWei Liu * we want to use bottom half because we want to make sure the below 24fe52840cSWei Liu * sequence of events. 25fe52840cSWei Liu * 26fe52840cSWei Liu * 1. Yield the coroutine in the QEMU thread. 27fe52840cSWei Liu * 2. Submit the coroutine to a worker thread. 28fe52840cSWei Liu * 3. Enter the coroutine in the worker thread. 29fe52840cSWei Liu * we cannot swap step 1 and 2, because that would imply worker thread 30fe52840cSWei Liu * can enter coroutine while step1 is still running 31da9f2edaSChristian Schoenebeck * 3209d19d58SChristian Schoenebeck * PERFORMANCE CONSIDERATIONS: As a rule of thumb, keep in mind 33da9f2edaSChristian Schoenebeck * that hopping between threads adds @b latency! So when handling a 34da9f2edaSChristian Schoenebeck * 9pfs request, avoid calling v9fs_co_run_in_worker() too often, because 35da9f2edaSChristian Schoenebeck * this might otherwise sum up to a significant, huge overall latency for 36da9f2edaSChristian Schoenebeck * providing the response for just a single request. For that reason it 37da9f2edaSChristian Schoenebeck * is highly recommended to fetch all data from fs driver with a single 38da9f2edaSChristian Schoenebeck * fs driver request on a background I/O thread (bottom half) in one rush 39da9f2edaSChristian Schoenebeck * first and then eventually assembling the final response from that data 40da9f2edaSChristian Schoenebeck * on main I/O thread (top half). 41fe52840cSWei Liu */ 42fe52840cSWei Liu #define v9fs_co_run_in_worker(code_block) \ 43fe52840cSWei Liu do { \ 44fe52840cSWei Liu QEMUBH *co_bh; \ 45fe52840cSWei Liu co_bh = qemu_bh_new(co_run_in_worker_bh, \ 46fe52840cSWei Liu qemu_coroutine_self()); \ 47fe52840cSWei Liu qemu_bh_schedule(co_bh); \ 48fe52840cSWei Liu /* \ 49fe52840cSWei Liu * yield in qemu thread and re-enter back \ 50fe52840cSWei Liu * in worker thread \ 51fe52840cSWei Liu */ \ 52fe52840cSWei Liu qemu_coroutine_yield(); \ 53fe52840cSWei Liu qemu_bh_delete(co_bh); \ 54f83df009SChristian Schoenebeck do { \ 55fe52840cSWei Liu code_block; \ 56f83df009SChristian Schoenebeck } while (0); \ 57fe52840cSWei Liu /* re-enter back to qemu thread */ \ 58fe52840cSWei Liu qemu_coroutine_yield(); \ 59fe52840cSWei Liu } while (0) 60fe52840cSWei Liu 61bc70a592SGreg Kurz void co_run_in_worker_bh(void *); 625bdade66SGreg Kurz int coroutine_fn v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *); 635bdade66SGreg Kurz int coroutine_fn v9fs_co_readdir(V9fsPDU *, V9fsFidState *, struct dirent **); 642149675bSChristian Schoenebeck int coroutine_fn v9fs_co_readdir_many(V9fsPDU *, V9fsFidState *, 652149675bSChristian Schoenebeck struct V9fsDirEnt **, off_t, int32_t, 662149675bSChristian Schoenebeck bool); 675bdade66SGreg Kurz off_t coroutine_fn v9fs_co_telldir(V9fsPDU *, V9fsFidState *); 685bdade66SGreg Kurz void coroutine_fn v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t); 695bdade66SGreg Kurz void coroutine_fn v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *); 705bdade66SGreg Kurz int coroutine_fn v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *); 715bdade66SGreg Kurz int coroutine_fn v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *); 725bdade66SGreg Kurz int coroutine_fn v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t); 735bdade66SGreg Kurz int coroutine_fn v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]); 745bdade66SGreg Kurz int coroutine_fn v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t); 755bdade66SGreg Kurz int coroutine_fn v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t); 765bdade66SGreg Kurz int coroutine_fn v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t); 775bdade66SGreg Kurz int coroutine_fn v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *, 78fe52840cSWei Liu V9fsString *, void *, size_t); 795bdade66SGreg Kurz int coroutine_fn v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t, 80fe52840cSWei Liu gid_t, dev_t, mode_t, struct stat *); 815bdade66SGreg Kurz int coroutine_fn v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *, 82fe52840cSWei Liu mode_t, uid_t, gid_t, struct stat *); 835bdade66SGreg Kurz int coroutine_fn v9fs_co_remove(V9fsPDU *, V9fsPath *); 845bdade66SGreg Kurz int coroutine_fn v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *); 855bdade66SGreg Kurz int coroutine_fn v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *, 865bdade66SGreg Kurz int flags); 875bdade66SGreg Kurz int coroutine_fn v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *, 88fe52840cSWei Liu V9fsPath *, V9fsString *); 895bdade66SGreg Kurz int coroutine_fn v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *); 905bdade66SGreg Kurz int coroutine_fn v9fs_co_opendir(V9fsPDU *, V9fsFidState *); 915bdade66SGreg Kurz int coroutine_fn v9fs_co_open(V9fsPDU *, V9fsFidState *, int); 925bdade66SGreg Kurz int coroutine_fn v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *, 93fe52840cSWei Liu gid_t, int, int, struct stat *); 945bdade66SGreg Kurz int coroutine_fn v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *, 95fe52840cSWei Liu void *, size_t, int); 965bdade66SGreg Kurz int coroutine_fn v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *); 975bdade66SGreg Kurz int coroutine_fn v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *); 985bdade66SGreg Kurz int coroutine_fn v9fs_co_close(V9fsPDU *, V9fsFidOpenState *); 995bdade66SGreg Kurz int coroutine_fn v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int); 1005bdade66SGreg Kurz int coroutine_fn v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *, 101fe52840cSWei Liu const char *, gid_t, struct stat *); 1025bdade66SGreg Kurz int coroutine_fn v9fs_co_link(V9fsPDU *, V9fsFidState *, 103fe52840cSWei Liu V9fsFidState *, V9fsString *); 1045bdade66SGreg Kurz int coroutine_fn v9fs_co_pwritev(V9fsPDU *, V9fsFidState *, 105fe52840cSWei Liu struct iovec *, int, int64_t); 1065bdade66SGreg Kurz int coroutine_fn v9fs_co_preadv(V9fsPDU *, V9fsFidState *, 107fe52840cSWei Liu struct iovec *, int, int64_t); 1085bdade66SGreg Kurz int coroutine_fn v9fs_co_name_to_path(V9fsPDU *, V9fsPath *, 109fe52840cSWei Liu const char *, V9fsPath *); 1105bdade66SGreg Kurz int coroutine_fn v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t, 111fe52840cSWei Liu V9fsStatDotl *v9stat); 112fe52840cSWei Liu 113fe52840cSWei Liu #endif 114