mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-15 15:15:47 +00:00
fa60ce2cb4
The section "19) Editor modelines and other cruft" in Documentation/process/coding-style.rst clearly says, "Do not include any of these in source files." I recently receive a patch to explicitly add a new one. Let's do treewide cleanups, otherwise some people follow the existing code and attempt to upstream their favoriate editor setups. It is even nicer if scripts/checkpatch.pl can check it. If we like to impose coding style in an editor-independent manner, I think editorconfig (patch [1]) is a saner solution. [1] https://lore.kernel.org/lkml/20200703073143.423557-1-danny@kdrag0n.dev/ Link: https://lkml.kernel.org/r/20210324054457.1477489-1-masahiroy@kernel.org Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: Miguel Ojeda <ojeda@kernel.org> [auxdisplay] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
128 lines
2.7 KiB
C
128 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* locks.c
|
|
*
|
|
* Userspace file locking support
|
|
*
|
|
* Copyright (C) 2007 Oracle. All rights reserved.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/fcntl.h>
|
|
|
|
#include <cluster/masklog.h>
|
|
|
|
#include "ocfs2.h"
|
|
|
|
#include "dlmglue.h"
|
|
#include "file.h"
|
|
#include "inode.h"
|
|
#include "locks.h"
|
|
|
|
static int ocfs2_do_flock(struct file *file, struct inode *inode,
|
|
int cmd, struct file_lock *fl)
|
|
{
|
|
int ret = 0, level = 0, trylock = 0;
|
|
struct ocfs2_file_private *fp = file->private_data;
|
|
struct ocfs2_lock_res *lockres = &fp->fp_flock;
|
|
|
|
if (fl->fl_type == F_WRLCK)
|
|
level = 1;
|
|
if (!IS_SETLKW(cmd))
|
|
trylock = 1;
|
|
|
|
mutex_lock(&fp->fp_mutex);
|
|
|
|
if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
|
|
lockres->l_level > LKM_NLMODE) {
|
|
int old_level = 0;
|
|
struct file_lock request;
|
|
|
|
if (lockres->l_level == LKM_EXMODE)
|
|
old_level = 1;
|
|
|
|
if (level == old_level)
|
|
goto out;
|
|
|
|
/*
|
|
* Converting an existing lock is not guaranteed to be
|
|
* atomic, so we can get away with simply unlocking
|
|
* here and allowing the lock code to try at the new
|
|
* level.
|
|
*/
|
|
|
|
locks_init_lock(&request);
|
|
request.fl_type = F_UNLCK;
|
|
request.fl_flags = FL_FLOCK;
|
|
locks_lock_file_wait(file, &request);
|
|
|
|
ocfs2_file_unlock(file);
|
|
}
|
|
|
|
ret = ocfs2_file_lock(file, level, trylock);
|
|
if (ret) {
|
|
if (ret == -EAGAIN && trylock)
|
|
ret = -EWOULDBLOCK;
|
|
else
|
|
mlog_errno(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = locks_lock_file_wait(file, fl);
|
|
if (ret)
|
|
ocfs2_file_unlock(file);
|
|
|
|
out:
|
|
mutex_unlock(&fp->fp_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ocfs2_do_funlock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
int ret;
|
|
struct ocfs2_file_private *fp = file->private_data;
|
|
|
|
mutex_lock(&fp->fp_mutex);
|
|
ocfs2_file_unlock(file);
|
|
ret = locks_lock_file_wait(file, fl);
|
|
mutex_unlock(&fp->fp_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Overall flow of ocfs2_flock() was influenced by gfs2_flock().
|
|
*/
|
|
int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
if (!(fl->fl_flags & FL_FLOCK))
|
|
return -ENOLCK;
|
|
if (__mandatory_lock(inode))
|
|
return -ENOLCK;
|
|
|
|
if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
|
|
ocfs2_mount_local(osb))
|
|
return locks_lock_file_wait(file, fl);
|
|
|
|
if (fl->fl_type == F_UNLCK)
|
|
return ocfs2_do_funlock(file, cmd, fl);
|
|
else
|
|
return ocfs2_do_flock(file, inode, cmd, fl);
|
|
}
|
|
|
|
int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl)
|
|
{
|
|
struct inode *inode = file->f_mapping->host;
|
|
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
|
|
|
|
if (!(fl->fl_flags & FL_POSIX))
|
|
return -ENOLCK;
|
|
if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
|
|
return -ENOLCK;
|
|
|
|
return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
|
|
}
|