655 строки
17 KiB
C
655 строки
17 KiB
C
/*
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* ioctl.c - NILFS ioctl operations.
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*
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* Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>.
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*/
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#include <linux/fs.h>
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#include <linux/wait.h>
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#include <linux/smp_lock.h> /* lock_kernel(), unlock_kernel() */
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#include <linux/capability.h> /* capable() */
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#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
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#include <linux/nilfs2_fs.h>
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#include "nilfs.h"
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#include "segment.h"
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#include "bmap.h"
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#include "cpfile.h"
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#include "sufile.h"
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#include "dat.h"
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static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
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struct nilfs_argv *argv, int dir,
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ssize_t (*dofunc)(struct the_nilfs *,
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__u64 *, int,
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void *, size_t, size_t))
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{
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void *buf;
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void __user *base = (void __user *)(unsigned long)argv->v_base;
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size_t maxmembs, total, n;
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ssize_t nr;
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int ret, i;
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__u64 pos, ppos;
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if (argv->v_nmembs == 0)
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return 0;
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if (argv->v_size > PAGE_SIZE)
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return -EINVAL;
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buf = (void *)__get_free_pages(GFP_NOFS, 0);
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if (unlikely(!buf))
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return -ENOMEM;
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maxmembs = PAGE_SIZE / argv->v_size;
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ret = 0;
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total = 0;
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pos = argv->v_index;
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for (i = 0; i < argv->v_nmembs; i += n) {
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n = (argv->v_nmembs - i < maxmembs) ?
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argv->v_nmembs - i : maxmembs;
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if ((dir & _IOC_WRITE) &&
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copy_from_user(buf, base + argv->v_size * i,
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argv->v_size * n)) {
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ret = -EFAULT;
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break;
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}
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ppos = pos;
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nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
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n);
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if (nr < 0) {
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ret = nr;
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break;
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}
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if ((dir & _IOC_READ) &&
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copy_to_user(base + argv->v_size * i, buf,
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argv->v_size * nr)) {
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ret = -EFAULT;
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break;
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}
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total += nr;
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if ((size_t)nr < n)
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break;
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if (pos == ppos)
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pos += n;
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}
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argv->v_nmembs = total;
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free_pages((unsigned long)buf, 0);
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return ret;
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}
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static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
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struct nilfs_transaction_info ti;
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struct nilfs_cpmode cpmode;
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int ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
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return -EFAULT;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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ret = nilfs_cpfile_change_cpmode(
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cpfile, cpmode.cm_cno, cpmode.cm_mode);
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if (unlikely(ret < 0)) {
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nilfs_transaction_abort(inode->i_sb);
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return ret;
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}
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nilfs_transaction_commit(inode->i_sb); /* never fails */
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return ret;
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}
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static int
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nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
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struct nilfs_transaction_info ti;
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__u64 cno;
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int ret;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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if (copy_from_user(&cno, argp, sizeof(cno)))
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return -EFAULT;
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nilfs_transaction_begin(inode->i_sb, &ti, 0);
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ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
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if (unlikely(ret < 0)) {
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nilfs_transaction_abort(inode->i_sb);
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return ret;
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}
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nilfs_transaction_commit(inode->i_sb); /* never fails */
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return ret;
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}
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static ssize_t
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nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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{
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return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
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nmembs);
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}
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static int nilfs_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_cpinfo);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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return ret;
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}
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static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_cpstat cpstat;
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int ret;
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
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ret = -EFAULT;
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return ret;
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}
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static ssize_t
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nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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{
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return nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, nmembs);
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}
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static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_suinfo);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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return ret;
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}
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static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_sustat sustat;
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int ret;
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &sustat, sizeof(sustat)))
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ret = -EFAULT;
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return ret;
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}
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static ssize_t
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nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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{
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return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
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}
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static int nilfs_ioctl_get_vinfo(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_vinfo);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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return ret;
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}
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static ssize_t
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nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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{
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struct inode *dat = nilfs_dat_inode(nilfs);
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struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
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struct nilfs_bdesc *bdescs = buf;
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int ret, i;
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for (i = 0; i < nmembs; i++) {
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ret = nilfs_bmap_lookup_at_level(bmap,
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bdescs[i].bd_offset,
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bdescs[i].bd_level + 1,
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&bdescs[i].bd_blocknr);
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if (ret < 0) {
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if (ret != -ENOENT)
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return ret;
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bdescs[i].bd_blocknr = 0;
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}
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}
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return nmembs;
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}
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static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
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unsigned int cmd, void __user *argp)
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{
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struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
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struct nilfs_argv argv;
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int ret;
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if (copy_from_user(&argv, argp, sizeof(argv)))
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return -EFAULT;
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down_read(&nilfs->ns_segctor_sem);
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ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
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nilfs_ioctl_do_get_bdescs);
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up_read(&nilfs->ns_segctor_sem);
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if (ret < 0)
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return ret;
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if (copy_to_user(argp, &argv, sizeof(argv)))
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ret = -EFAULT;
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return ret;
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}
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static int nilfs_ioctl_move_inode_block(struct inode *inode,
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struct nilfs_vdesc *vdesc,
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struct list_head *buffers)
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{
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struct buffer_head *bh;
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int ret;
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if (vdesc->vd_flags == 0)
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ret = nilfs_gccache_submit_read_data(
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inode, vdesc->vd_offset, vdesc->vd_blocknr,
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vdesc->vd_vblocknr, &bh);
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else
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ret = nilfs_gccache_submit_read_node(
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inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
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if (unlikely(ret < 0)) {
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if (ret == -ENOENT)
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printk(KERN_CRIT
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"%s: invalid virtual block address (%s): "
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"ino=%llu, cno=%llu, offset=%llu, "
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"blocknr=%llu, vblocknr=%llu\n",
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__func__, vdesc->vd_flags ? "node" : "data",
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(unsigned long long)vdesc->vd_ino,
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(unsigned long long)vdesc->vd_cno,
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(unsigned long long)vdesc->vd_offset,
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(unsigned long long)vdesc->vd_blocknr,
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(unsigned long long)vdesc->vd_vblocknr);
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return ret;
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}
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bh->b_private = vdesc;
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list_add_tail(&bh->b_assoc_buffers, buffers);
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return 0;
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}
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static ssize_t
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nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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{
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struct inode *inode;
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struct nilfs_vdesc *vdesc;
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struct buffer_head *bh, *n;
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LIST_HEAD(buffers);
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ino_t ino;
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__u64 cno;
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int i, ret;
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for (i = 0, vdesc = buf; i < nmembs; ) {
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ino = vdesc->vd_ino;
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cno = vdesc->vd_cno;
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inode = nilfs_gc_iget(nilfs, ino, cno);
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if (unlikely(inode == NULL)) {
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ret = -ENOMEM;
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goto failed;
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}
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do {
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ret = nilfs_ioctl_move_inode_block(inode, vdesc,
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&buffers);
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if (unlikely(ret < 0))
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goto failed;
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vdesc++;
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} while (++i < nmembs &&
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vdesc->vd_ino == ino && vdesc->vd_cno == cno);
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}
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list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
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ret = nilfs_gccache_wait_and_mark_dirty(bh);
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if (unlikely(ret < 0)) {
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if (ret == -EEXIST) {
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vdesc = bh->b_private;
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printk(KERN_CRIT
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"%s: conflicting %s buffer: "
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"ino=%llu, cno=%llu, offset=%llu, "
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"blocknr=%llu, vblocknr=%llu\n",
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__func__,
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vdesc->vd_flags ? "node" : "data",
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(unsigned long long)vdesc->vd_ino,
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(unsigned long long)vdesc->vd_cno,
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(unsigned long long)vdesc->vd_offset,
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(unsigned long long)vdesc->vd_blocknr,
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(unsigned long long)vdesc->vd_vblocknr);
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}
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goto failed;
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}
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list_del_init(&bh->b_assoc_buffers);
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bh->b_private = NULL;
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brelse(bh);
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}
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return nmembs;
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failed:
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list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
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list_del_init(&bh->b_assoc_buffers);
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bh->b_private = NULL;
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brelse(bh);
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}
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return ret;
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}
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static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
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struct nilfs_argv *argv,
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int dir)
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{
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return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
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nilfs_ioctl_do_move_blocks);
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}
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static ssize_t
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nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, __u64 *posp,
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int flags, void *buf, size_t size,
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size_t nmembs)
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{
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struct inode *cpfile = nilfs->ns_cpfile;
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struct nilfs_period *periods = buf;
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int ret, i;
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for (i = 0; i < nmembs; i++) {
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ret = nilfs_cpfile_delete_checkpoints(
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cpfile, periods[i].p_start, periods[i].p_end);
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if (ret < 0)
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return ret;
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}
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return nmembs;
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}
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static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
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struct nilfs_argv *argv,
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int dir)
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{
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return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
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nilfs_ioctl_do_delete_checkpoints);
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}
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static ssize_t
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nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, __u64 *posp, int flags,
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void *buf, size_t size, size_t nmembs)
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{
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int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
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return (ret < 0) ? ret : nmembs;
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}
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static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
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struct nilfs_argv *argv,
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int dir)
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{
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return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
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nilfs_ioctl_do_free_vblocknrs);
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}
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static ssize_t
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nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, __u64 *posp,
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int flags, void *buf, size_t size,
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size_t nmembs)
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{
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struct inode *dat = nilfs_dat_inode(nilfs);
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struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
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struct nilfs_bdesc *bdescs = buf;
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int ret, i;
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for (i = 0; i < nmembs; i++) {
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/* XXX: use macro or inline func to check liveness */
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ret = nilfs_bmap_lookup_at_level(bmap,
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bdescs[i].bd_offset,
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bdescs[i].bd_level + 1,
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&bdescs[i].bd_blocknr);
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if (ret < 0) {
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if (ret != -ENOENT)
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return ret;
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bdescs[i].bd_blocknr = 0;
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}
|
|
if (bdescs[i].bd_blocknr != bdescs[i].bd_oblocknr)
|
|
/* skip dead block */
|
|
continue;
|
|
if (bdescs[i].bd_level == 0) {
|
|
ret = nilfs_mdt_mark_block_dirty(dat,
|
|
bdescs[i].bd_offset);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
return ret;
|
|
}
|
|
} else {
|
|
ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
|
|
bdescs[i].bd_level);
|
|
if (ret < 0) {
|
|
WARN_ON(ret == -ENOENT);
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
return nmembs;
|
|
}
|
|
|
|
static inline int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
|
|
struct nilfs_argv *argv,
|
|
int dir)
|
|
{
|
|
return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
|
|
nilfs_ioctl_do_mark_blocks_dirty);
|
|
}
|
|
|
|
static ssize_t
|
|
nilfs_ioctl_do_free_segments(struct the_nilfs *nilfs, __u64 *posp, int flags,
|
|
void *buf, size_t size, size_t nmembs)
|
|
{
|
|
struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);
|
|
int ret;
|
|
|
|
if (unlikely(!sbi))
|
|
return -EROFS;
|
|
ret = nilfs_segctor_add_segments_to_be_freed(
|
|
NILFS_SC(sbi), buf, nmembs);
|
|
nilfs_put_writer(nilfs);
|
|
|
|
return (ret < 0) ? ret : nmembs;
|
|
}
|
|
|
|
static inline int nilfs_ioctl_free_segments(struct the_nilfs *nilfs,
|
|
struct nilfs_argv *argv,
|
|
int dir)
|
|
{
|
|
return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
|
|
nilfs_ioctl_do_free_segments);
|
|
}
|
|
|
|
int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
|
|
void __user *argp)
|
|
{
|
|
struct nilfs_argv argv[5];
|
|
const char *msg;
|
|
int dir, ret;
|
|
|
|
if (copy_from_user(argv, argp, sizeof(argv)))
|
|
return -EFAULT;
|
|
|
|
dir = _IOC_WRITE;
|
|
ret = nilfs_ioctl_move_blocks(nilfs, &argv[0], dir);
|
|
if (ret < 0) {
|
|
msg = "cannot read source blocks";
|
|
goto failed;
|
|
}
|
|
ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
|
|
if (ret < 0) {
|
|
/*
|
|
* can safely abort because checkpoints can be removed
|
|
* independently.
|
|
*/
|
|
msg = "cannot delete checkpoints";
|
|
goto failed;
|
|
}
|
|
ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
|
|
if (ret < 0) {
|
|
/*
|
|
* can safely abort because DAT file is updated atomically
|
|
* using a copy-on-write technique.
|
|
*/
|
|
msg = "cannot delete virtual blocks from DAT file";
|
|
goto failed;
|
|
}
|
|
ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
|
|
if (ret < 0) {
|
|
/*
|
|
* can safely abort because the operation is nondestructive.
|
|
*/
|
|
msg = "cannot mark copying blocks dirty";
|
|
goto failed;
|
|
}
|
|
ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
|
|
if (ret < 0) {
|
|
/*
|
|
* can safely abort because this operation is atomic.
|
|
*/
|
|
msg = "cannot set segments to be freed";
|
|
goto failed;
|
|
}
|
|
return 0;
|
|
|
|
failed:
|
|
nilfs_remove_all_gcinode(nilfs);
|
|
printk(KERN_ERR "NILFS: GC failed during preparation: %s: err=%d\n",
|
|
msg, ret);
|
|
return ret;
|
|
}
|
|
|
|
static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
|
|
unsigned int cmd, void __user *argp)
|
|
{
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
return nilfs_clean_segments(inode->i_sb, argp);
|
|
}
|
|
|
|
static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
|
|
unsigned int cmd, void __user *argp)
|
|
{
|
|
__u64 cno;
|
|
int ret;
|
|
|
|
ret = nilfs_construct_segment(inode->i_sb);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (argp != NULL) {
|
|
cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
|
|
if (copy_to_user(argp, &cno, sizeof(cno)))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
|
void __user *argp = (void * __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case NILFS_IOCTL_CHANGE_CPMODE:
|
|
return nilfs_ioctl_change_cpmode(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_DELETE_CHECKPOINT:
|
|
return nilfs_ioctl_delete_checkpoint(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_GET_CPINFO:
|
|
return nilfs_ioctl_get_cpinfo(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_GET_CPSTAT:
|
|
return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_GET_SUINFO:
|
|
return nilfs_ioctl_get_suinfo(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_GET_SUSTAT:
|
|
return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_GET_VINFO:
|
|
/* XXX: rename to ??? */
|
|
return nilfs_ioctl_get_vinfo(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_GET_BDESCS:
|
|
return nilfs_ioctl_get_bdescs(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_CLEAN_SEGMENTS:
|
|
return nilfs_ioctl_clean_segments(inode, filp, cmd, argp);
|
|
case NILFS_IOCTL_SYNC:
|
|
return nilfs_ioctl_sync(inode, filp, cmd, argp);
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|