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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /fs/ocfs2/locks.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/ocfs2/locks.c')
-rw-r--r--fs/ocfs2/locks.c124
1 files changed, 124 insertions, 0 deletions
diff --git a/fs/ocfs2/locks.c b/fs/ocfs2/locks.c
new file mode 100644
index 000000000..73a3854b2
--- /dev/null
+++ b/fs/ocfs2/locks.c
@@ -0,0 +1,124 @@
+// 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 ((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;
+
+ return ocfs2_plock(osb->cconn, OCFS2_I(inode)->ip_blkno, file, cmd, fl);
+}