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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
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/*
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* locks.c
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*
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* Userspace file locking support
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*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "dlmglue.h"
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#include "file.h"
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#include "inode.h"
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#include "locks.h"
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static int ocfs2_do_flock(struct file *file, struct inode *inode,
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int cmd, struct file_lock *fl)
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{
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int ret = 0, level = 0, trylock = 0;
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struct ocfs2_file_private *fp = file->private_data;
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struct ocfs2_lock_res *lockres = &fp->fp_flock;
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if (fl->fl_type == F_WRLCK)
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level = 1;
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if (!IS_SETLKW(cmd))
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trylock = 1;
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mutex_lock(&fp->fp_mutex);
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if (lockres->l_flags & OCFS2_LOCK_ATTACHED &&
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lockres->l_level > LKM_NLMODE) {
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int old_level = 0;
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struct file_lock request;
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if (lockres->l_level == LKM_EXMODE)
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old_level = 1;
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if (level == old_level)
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goto out;
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/*
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* Converting an existing lock is not guaranteed to be
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* atomic, so we can get away with simply unlocking
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* here and allowing the lock code to try at the new
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* level.
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*/
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locks_init_lock(&request);
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request.fl_type = F_UNLCK;
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request.fl_flags = FL_FLOCK;
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locks_lock_file_wait(file, &request);
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ocfs2_file_unlock(file);
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}
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ret = ocfs2_file_lock(file, level, trylock);
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if (ret) {
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if (ret == -EAGAIN && trylock)
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ret = -EWOULDBLOCK;
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else
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mlog_errno(ret);
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goto out;
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}
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ret = locks_lock_file_wait(file, fl);
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if (ret)
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ocfs2_file_unlock(file);
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out:
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mutex_unlock(&fp->fp_mutex);
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return ret;
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}
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static int ocfs2_do_funlock(struct file *file, int cmd, struct file_lock *fl)
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{
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int ret;
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struct ocfs2_file_private *fp = file->private_data;
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mutex_lock(&fp->fp_mutex);
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ocfs2_file_unlock(file);
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ret = locks_lock_file_wait(file, fl);
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mutex_unlock(&fp->fp_mutex);
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return ret;
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}
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/*
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* Overall flow of ocfs2_flock() was influenced by gfs2_flock().
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*/
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int ocfs2_flock(struct file *file, int cmd, struct file_lock *fl)
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{
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struct inode *inode = file->f_mapping->host;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (!(fl->fl_flags & FL_FLOCK))
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return -ENOLCK;
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if (__mandatory_lock(inode))
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return -ENOLCK;
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if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
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ocfs2_mount_local(osb))
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return locks_lock_file_wait(file, fl);
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if (fl->fl_type == F_UNLCK)
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return ocfs2_do_funlock(file, cmd, fl);
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else
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return ocfs2_do_flock(file, inode, cmd, fl);
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}
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int ocfs2_lock(struct file *file, int cmd, struct file_lock *fl)
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{
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struct inode *inode = file->f_mapping->host;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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if (!(fl->fl_flags & FL_POSIX))
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return -ENOLCK;
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if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
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return -ENOLCK;
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return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
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}
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