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-rw-r--r--qemu/hw/9pfs/coth.h99
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diff --git a/qemu/hw/9pfs/coth.h b/qemu/hw/9pfs/coth.h
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+++ b/qemu/hw/9pfs/coth.h
@@ -0,0 +1,99 @@
+/*
+ * 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 "virtio-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
+ */
+#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); \
+ code_block; \
+ /* re-enter back to qemu thread */ \
+ qemu_coroutine_yield(); \
+ } while (0)
+
+extern void co_run_in_worker_bh(void *);
+extern int v9fs_init_worker_threads(void);
+extern int v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *);
+extern int v9fs_co_readdir_r(V9fsPDU *, V9fsFidState *,
+ struct dirent *, struct dirent **result);
+extern off_t v9fs_co_telldir(V9fsPDU *, V9fsFidState *);
+extern void v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t);
+extern void v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *);
+extern int v9fs_co_statfs(V9fsPDU *, V9fsPath *, struct statfs *);
+extern int v9fs_co_lstat(V9fsPDU *, V9fsPath *, struct stat *);
+extern int v9fs_co_chmod(V9fsPDU *, V9fsPath *, mode_t);
+extern int v9fs_co_utimensat(V9fsPDU *, V9fsPath *, struct timespec [2]);
+extern int v9fs_co_chown(V9fsPDU *, V9fsPath *, uid_t, gid_t);
+extern int v9fs_co_truncate(V9fsPDU *, V9fsPath *, off_t);
+extern int v9fs_co_llistxattr(V9fsPDU *, V9fsPath *, void *, size_t);
+extern int v9fs_co_lgetxattr(V9fsPDU *, V9fsPath *,
+ V9fsString *, void *, size_t);
+extern int v9fs_co_mknod(V9fsPDU *, V9fsFidState *, V9fsString *, uid_t,
+ gid_t, dev_t, mode_t, struct stat *);
+extern int v9fs_co_mkdir(V9fsPDU *, V9fsFidState *, V9fsString *,
+ mode_t, uid_t, gid_t, struct stat *);
+extern int v9fs_co_remove(V9fsPDU *, V9fsPath *);
+extern int v9fs_co_rename(V9fsPDU *, V9fsPath *, V9fsPath *);
+extern int v9fs_co_unlinkat(V9fsPDU *, V9fsPath *, V9fsString *, int flags);
+extern int v9fs_co_renameat(V9fsPDU *, V9fsPath *, V9fsString *,
+ V9fsPath *, V9fsString *);
+extern int v9fs_co_fstat(V9fsPDU *, V9fsFidState *, struct stat *);
+extern int v9fs_co_opendir(V9fsPDU *, V9fsFidState *);
+extern int v9fs_co_open(V9fsPDU *, V9fsFidState *, int);
+extern int v9fs_co_open2(V9fsPDU *, V9fsFidState *, V9fsString *,
+ gid_t, int, int, struct stat *);
+extern int v9fs_co_lsetxattr(V9fsPDU *, V9fsPath *, V9fsString *,
+ void *, size_t, int);
+extern int v9fs_co_lremovexattr(V9fsPDU *, V9fsPath *, V9fsString *);
+extern int v9fs_co_closedir(V9fsPDU *, V9fsFidOpenState *);
+extern int v9fs_co_close(V9fsPDU *, V9fsFidOpenState *);
+extern int v9fs_co_fsync(V9fsPDU *, V9fsFidState *, int);
+extern int v9fs_co_symlink(V9fsPDU *, V9fsFidState *, V9fsString *,
+ const char *, gid_t, struct stat *);
+extern int v9fs_co_link(V9fsPDU *, V9fsFidState *,
+ V9fsFidState *, V9fsString *);
+extern int v9fs_co_pwritev(V9fsPDU *, V9fsFidState *,
+ struct iovec *, int, int64_t);
+extern int v9fs_co_preadv(V9fsPDU *, V9fsFidState *,
+ struct iovec *, int, int64_t);
+extern int v9fs_co_name_to_path(V9fsPDU *, V9fsPath *,
+ const char *, V9fsPath *);
+extern int v9fs_co_st_gen(V9fsPDU *pdu, V9fsPath *path, mode_t,
+ V9fsStatDotl *v9stat);
+
+#endif