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Diffstat (limited to 'hw/9pfs/coth.h')
| -rw-r--r-- | hw/9pfs/coth.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/hw/9pfs/coth.h b/hw/9pfs/coth.h new file mode 100644 index 000000000..f83c7dda7 --- /dev/null +++ b/hw/9pfs/coth.h @@ -0,0 +1,113 @@ +/* + * 9p backend + * + * Copyright IBM, Corp. 2010 + * + * Authors: + * Harsh Prateek Bora <harsh@linux.vnet.ibm.com> + * Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#ifndef QEMU_9P_COTH_H +#define QEMU_9P_COTH_H + +#include "qemu/thread.h" +#include "qemu/coroutine.h" +#include "9p.h" + +/** + * we want to use bottom half because we want to make sure the below + * sequence of events. + * + * 1. Yield the coroutine in the QEMU thread. + * 2. Submit the coroutine to a worker thread. + * 3. Enter the coroutine in the worker thread. + * we cannot swap step 1 and 2, because that would imply worker thread + * can enter coroutine while step1 is still running + * + * @b PERFORMANCE @b CONSIDERATIONS: As a rule of thumb, keep in mind + * that hopping between threads adds @b latency! So when handling a + * 9pfs request, avoid calling v9fs_co_run_in_worker() too often, because + * this might otherwise sum up to a significant, huge overall latency for + * providing the response for just a single request. For that reason it + * is highly recommended to fetch all data from fs driver with a single + * fs driver request on a background I/O thread (bottom half) in one rush + * first and then eventually assembling the final response from that data + * on main I/O thread (top half). + */ +#define v9fs_co_run_in_worker(code_block) \ + do { \ + QEMUBH *co_bh; \ + co_bh = qemu_bh_new(co_run_in_worker_bh, \ + qemu_coroutine_self()); \ + qemu_bh_schedule(co_bh); \ + /* \ + * yield in qemu thread and re-enter back \ + * in worker thread \ + */ \ + qemu_coroutine_yield(); \ + qemu_bh_delete(co_bh); \ + do { \ + code_block; \ + } while (0); \ + /* re-enter back to qemu thread */ \ + qemu_coroutine_yield(); \ + } while (0) + +void co_run_in_worker_bh(void *); +int coroutine_fn v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *); +int coroutine_fn v9fs_co_readdir(V9fsPDU *, V9fsFidState *, struct dirent **); +int coroutine_fn v9fs_co_readdir_many(V9fsPDU *, V9fsFidState *, + struct V9fsDirEnt **, off_t, int32_t, + bool); +off_t coroutine_fn v9fs_co_telldir(V9fsPDU *, V9fsFidState *); +void coroutine_fn v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t); +void coroutine_fn v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *); +int coroutine_fn v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *); +int coroutine_fn v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *); +int coroutine_fn v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t); +int coroutine_fn v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]); +int coroutine_fn v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t); +int coroutine_fn v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t); +int coroutine_fn v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t); +int coroutine_fn v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *, + V9fsString *, void *, size_t); +int coroutine_fn v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t, + gid_t, dev_t, mode_t, struct stat *); +int coroutine_fn v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *, + mode_t, uid_t, gid_t, struct stat *); +int coroutine_fn v9fs_co_remove(V9fsPDU *, V9fsPath *); +int coroutine_fn v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *); +int coroutine_fn v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *, + int flags); +int coroutine_fn v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *, + V9fsPath *, V9fsString *); +int coroutine_fn v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *); +int coroutine_fn v9fs_co_opendir(V9fsPDU *, V9fsFidState *); +int coroutine_fn v9fs_co_open(V9fsPDU *, V9fsFidState *, int); +int coroutine_fn v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *, + gid_t, int, int, struct stat *); +int coroutine_fn v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *, + void *, size_t, int); +int coroutine_fn v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *); +int coroutine_fn v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *); +int coroutine_fn v9fs_co_close(V9fsPDU *, V9fsFidOpenState *); +int coroutine_fn v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int); +int coroutine_fn v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *, + const char *, gid_t, struct stat *); +int coroutine_fn v9fs_co_link(V9fsPDU *, V9fsFidState *, + V9fsFidState *, V9fsString *); +int coroutine_fn v9fs_co_pwritev(V9fsPDU *, V9fsFidState *, + struct iovec *, int, int64_t); +int coroutine_fn v9fs_co_preadv(V9fsPDU *, V9fsFidState *, + struct iovec *, int, int64_t); +int coroutine_fn v9fs_co_name_to_path(V9fsPDU *, V9fsPath *, + const char *, V9fsPath *); +int coroutine_fn v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t, + V9fsStatDotl *v9stat); + +#endif |