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Annotation of qemu/hw/9pfs/virtio-9p-coth.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Virtio 9p backend
        !             3:  *
        !             4:  * Copyright IBM, Corp. 2010
        !             5:  *
        !             6:  * Authors:
        !             7:  *  Harsh Prateek Bora <[email protected]>
        !             8:  *  Venkateswararao Jujjuri(JV) <[email protected]>
        !             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_VIRTIO_9P_COTH_H
        !            16: #define _QEMU_VIRTIO_9P_COTH_H
        !            17: 
        !            18: #include "qemu-thread.h"
        !            19: #include "qemu-coroutine.h"
        !            20: #include "virtio-9p.h"
        !            21: #include <glib.h>
        !            22: 
        !            23: typedef struct V9fsThPool {
        !            24:     int rfd;
        !            25:     int wfd;
        !            26:     GThreadPool *pool;
        !            27:     GAsyncQueue *completed;
        !            28: } V9fsThPool;
        !            29: 
        !            30: /*
        !            31:  * we want to use bottom half because we want to make sure the below
        !            32:  * sequence of events.
        !            33:  *
        !            34:  *   1. Yield the coroutine in the QEMU thread.
        !            35:  *   2. Submit the coroutine to a worker thread.
        !            36:  *   3. Enter the coroutine in the worker thread.
        !            37:  * we cannot swap step 1 and 2, because that would imply worker thread
        !            38:  * can enter coroutine while step1 is still running
        !            39:  */
        !            40: #define v9fs_co_run_in_worker(code_block)                               \
        !            41:     do {                                                                \
        !            42:         QEMUBH *co_bh;                                                  \
        !            43:         co_bh = qemu_bh_new(co_run_in_worker_bh,                        \
        !            44:                             qemu_coroutine_self());                     \
        !            45:         qemu_bh_schedule(co_bh);                                        \
        !            46:         /*                                                              \
        !            47:          * yeild in qemu thread and re-enter back                       \
        !            48:          * in glib worker thread                                        \
        !            49:          */                                                             \
        !            50:         qemu_coroutine_yield();                                         \
        !            51:         qemu_bh_delete(co_bh);                                          \
        !            52:         code_block;                                                     \
        !            53:         /* re-enter back to qemu thread */                              \
        !            54:         qemu_coroutine_yield();                                         \
        !            55:     } while (0)
        !            56: 
        !            57: extern void co_run_in_worker_bh(void *);
        !            58: extern int v9fs_init_worker_threads(void);
        !            59: extern int v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *);
        !            60: extern int v9fs_co_readdir_r(V9fsPDU *, V9fsFidState *,
        !            61:                            struct dirent *, struct dirent **result);
        !            62: extern off_t v9fs_co_telldir(V9fsPDU *, V9fsFidState *);
        !            63: extern void v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t);
        !            64: extern void v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *);
        !            65: extern int v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *);
        !            66: extern int v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *);
        !            67: extern int v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t);
        !            68: extern int v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]);
        !            69: extern int v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t);
        !            70: extern int v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t);
        !            71: extern int v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t);
        !            72: extern int v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *,
        !            73:                              V9fsString *, void *, size_t);
        !            74: extern int v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t,
        !            75:                          gid_t, dev_t, mode_t, struct stat *);
        !            76: extern int v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *,
        !            77:                          mode_t, uid_t, gid_t, struct stat *);
        !            78: extern int v9fs_co_remove(V9fsPDU *, V9fsPath *);
        !            79: extern int v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *);
        !            80: extern int v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *, int flags);
        !            81: extern int v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *,
        !            82:                             V9fsPath *, V9fsString *);
        !            83: extern int v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *);
        !            84: extern int v9fs_co_opendir(V9fsPDU *, V9fsFidState *);
        !            85: extern int v9fs_co_open(V9fsPDU *, V9fsFidState *, int);
        !            86: extern int v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *,
        !            87:                          gid_t, int, int, struct stat *);
        !            88: extern int v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *,
        !            89:                              void *, size_t, int);
        !            90: extern int v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *);
        !            91: extern int v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *);
        !            92: extern int v9fs_co_close(V9fsPDU *, V9fsFidOpenState *);
        !            93: extern int v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int);
        !            94: extern int v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *,
        !            95:                            const char *, gid_t, struct stat *);
        !            96: extern int v9fs_co_link(V9fsPDU *, V9fsFidState *,
        !            97:                         V9fsFidState *, V9fsString *);
        !            98: extern int v9fs_co_pwritev(V9fsPDU *, V9fsFidState *,
        !            99:                            struct iovec *, int, int64_t);
        !           100: extern int v9fs_co_preadv(V9fsPDU *, V9fsFidState *,
        !           101:                           struct iovec *, int, int64_t);
        !           102: extern int v9fs_co_name_to_path(V9fsPDU *, V9fsPath *,
        !           103:                                 const char *, V9fsPath *);
        !           104: extern int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t,
        !           105:                           V9fsStatDotl *v9stat);
        !           106: 
        !           107: #endif

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