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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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src/system/kernel/fs/devfs.cpp
+4 -2
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@@ -1643,7 +1643,8 @@ devfs_can_page(fs_volume _fs, fs_vnode _vnode, fs_cookie cookie)
static status_t
devfs_read_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
devfs_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)
{
struct devfs_vnode *vnode = (devfs_vnode *)_vnode;
struct devfs_cookie *cookie = (struct devfs_cookie *)_cookie;
@@ -1663,7 +1664,8 @@ devfs_read_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos, c
static status_t
devfs_write_pages(fs_volume _fs, fs_vnode _vnode, fs_cookie _cookie, off_t pos, const iovec *vecs, size_t count, size_t *_numBytes)
devfs_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)
{
struct devfs_vnode *vnode = (devfs_vnode *)_vnode;
struct devfs_cookie *cookie = (struct devfs_cookie *)_cookie;