static int do_remount_sb(struct super_block *sb, int flags, char *data)
{
int retval;
struct vfsmount *vfsmnt;
/*
* Invalidate the inodes, as some mount options may be changed.
* N.B. If we are changing media, we should check the return
* from invalidate_inodes ... can't allow _any_ open files.
*/
invalidate_inodes(sb);
if (!(flags & MS_RDONLY) && sb->s_dev && is_read_only(sb->s_dev))
return -EACCES;
/*flags |= MS_RDONLY;*/
/* If we are remounting RDONLY, make sure there are no rw files open */
if ((flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY))
if (!fs_may_remount_ro(sb))
return -EBUSY;
if (sb->s_op && sb->s_op->remount_fs) {
retval = sb->s_op->remount_fs(sb, &flags, data);
if (retval)
return retval;
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
vfsmnt = lookup_vfsmnt(sb->s_dev);
if (vfsmnt)
vfsmnt->mnt_flags = sb->s_flags;
return 0;
}
static void go_sync(kdev_t dev, int remount_flag)
{
printk(KERN_INFO "%sing device %s ... ",
remount_flag ? "Remount" : "Sync",
kdevname(dev));
if (remount_flag) { /* Remount R/O */
struct super_block *sb = get_super(dev);
struct vfsmount *vfsmnt;
int ret, flags;
if (!sb) {
printk("Superblock not found\n");
return;
}
if (sb->s_flags & MS_RDONLY) {
printk("R/O\n");
return;
}
DQUOT_OFF(dev);
fsync_dev(dev);
flags = MS_RDONLY;
if (sb->s_op && sb->s_op->remount_fs) {
ret = sb->s_op->remount_fs(sb, &flags, NULL);
if (ret)
printk("error %d\n", ret);
else {
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
if ((vfsmnt = lookup_vfsmnt(sb->s_dev)))
vfsmnt->mnt_flags = sb->s_flags;
printk("OK\n");
}
} else
printk("nothing to do\n");
} else {
fsync_dev(dev); /* Sync only */
printk("OK\n");
}
}
static int do_remount_sb(struct super_block *sb, int flags, char *data)
{
int retval;
struct vfsmount *vfsmnt;
if (!(flags & MS_RDONLY) && sb->s_dev && is_read_only(sb->s_dev))
return -EACCES;
/*flags |= MS_RDONLY;*/
/* If we are remounting RDONLY, make sure there are no rw files open */
if ((flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY))
if (!fs_may_remount_ro(sb->s_dev))
return -EBUSY;
if (sb->s_op && sb->s_op->remount_fs) {
retval = sb->s_op->remount_fs(sb, &flags, data);
if (retval)
return retval;
}
sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
vfsmnt = lookup_vfsmnt(sb->s_dev);
if (vfsmnt)
vfsmnt->mnt_flags = sb->s_flags;
return 0;
}
