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Added a "reenter" parameter to the {read|write}_pages() functions to give file

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systems a chance to know if they have locked already.
This fixes a locking problem in BFS where one thread tried to acquire two read
locks (where someone else trying to acquire a write lock would have caused a
dead lock).


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17108 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler
2006-04-12 13:34:04 +00:00
parent 4d89d3e7e1
commit 97e069713b
18 changed files with 104 additions and 80 deletions
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headers/os/drivers/fs_interface.h
+5 -3
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@@ -1,6 +1,6 @@
/* File System Interface Layer Definition
*
* Copyright 2004-2005, Haiku Inc. All Rights Reserved.
* Copyright 2004-2006, Haiku Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*/
#ifndef _FS_INTERFACE_H
@@ -87,8 +87,10 @@ typedef struct file_system_module_info {
/* VM file access */
bool (*can_page)(fs_volume fs, fs_vnode vnode, fs_cookie cookie);
status_t (*read_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes);
status_t (*write_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes);
status_t (*read_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
const iovec *vecs, size_t count, size_t *_numBytes, bool reenter);
status_t (*write_pages)(fs_volume fs, fs_vnode vnode, fs_cookie cookie, off_t pos,
const iovec *vecs, size_t count, size_t *_numBytes, bool reenter);
/* cache file access */
status_t (*get_file_map)(fs_volume fs, fs_vnode vnode, off_t offset, size_t size, struct file_io_vec *vecs, size_t *_count);