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git://sourceware.org/git/lvm2.git
synced 2025-01-09 01:18:39 +03:00
d5880f97c5
old dmfs-lv.c thats gone. o Dropped out support for multiple tables in line with ioctl interface o Some reordering to better support the userland library o Updated to 2.4.16 I'm fairly happy with the way that this is working now, so the next job is to start the integration with the ioctl interface so there is a single common dm.[ch] and selectable interfaces (fs or ioctl). Further improvements can be made even now, but I hope to wait until we've got this going and integrated and the libdm parts working as well before investigating other avenues.
103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
/*
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* dmfs-active.c
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*
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* Copyright (C) 2001 Sistina Software
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*
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* This software is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2, or (at
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* your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <linux/config.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include "dm.h"
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#include "dmfs.h"
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static void *s_start(struct seq_file *s, loff_t *pos)
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{
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struct dmfs_i *dmi = s->context;
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if (*pos > 0)
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return NULL;
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down(&dmi->sem);
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return (void *)1;
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}
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static void *s_next(struct seq_file *s, void *v, loff_t *pos)
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{
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(*pos)++;
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return NULL;
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}
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static void s_stop(struct seq_file *s, void *v)
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{
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struct dmfs_i *dmi = s->context;
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up(&dmi->sem);
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}
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static int s_show(struct seq_file *s, void *v)
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{
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struct dmfs_i *dmi = s->context;
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char msg[3] = "0\n";
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if (is_active(dmi->md)) {
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msg[1] = '1';
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}
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seq_puts(s, msg);
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return 0;
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}
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struct seq_operations dmfs_active_seq_ops = {
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start: s_start,
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next: s_next,
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stop: s_stop,
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show: s_show,
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};
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ssize_t dmfs_active_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
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{
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struct inode *dir = file->f_dentry->d_parent->d_inode;
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struct dmfs_i *dmi = DMFS_I(dir);
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int written = 0;
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if (count == 0)
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goto out;
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if (count != 1 && count != 2)
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return -EINVAL;
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if (buf[0] != '0' && buf[0] != '1')
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return -EINVAL;
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down(&dmi->sem);
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written = count;
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if (is_active(dmi->md)) {
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if (buf[0] == '0')
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dm_deactivate(dmi->md);
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} else {
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if (buf[0] == '1') {
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if (dmi->md->map) {
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dm_activate(dmi->md, dmi->md->map);
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} else {
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written = -EPERM;
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}
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}
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}
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up(&dmi->sem);
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out:
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return written;
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}
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