nilfs2: ioctl operations

This adds userland interface implemented with ioctl.

Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 941 insertions, 0 deletions

diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
new file mode 100644
index 000000000000..35ba60ea9617
--- /dev/null
+++ b/fs/nilfs2/ioctl.c
@@ -0,0 +1,941 @@
+/*
+ * ioctl.c - NILFS ioctl operations.
+ *
+ * Copyright (C) 2007, 2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Written by Koji Sato <koji@osrg.net>.
+ */
+
+#include <linux/fs.h>
+#include <linux/wait.h>
+#include <linux/smp_lock.h>     /* lock_kernel(), unlock_kernel() */
+#include <linux/capability.h>   /* capable() */
+#include <linux/uaccess.h>      /* copy_from_user(), copy_to_user() */
+#include <linux/nilfs2_fs.h>
+#include "nilfs.h"
+#include "segment.h"
+#include "bmap.h"
+#include "cpfile.h"
+#include "sufile.h"
+#include "dat.h"
+
+
+#define KMALLOC_SIZE_MIN        4096    /* 4KB */
+#define KMALLOC_SIZE_MAX        131072  /* 128 KB */
+
+static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
+                                 struct nilfs_argv *argv, int dir,
+                                 ssize_t (*dofunc)(struct the_nilfs *,
+                                                   int, int,
+                                                   void *, size_t, size_t))
+{
+        void *buf;
+        size_t ksize, maxmembs, total, n;
+        ssize_t nr;
+        int ret, i;
+
+        if (argv->v_nmembs == 0)
+                return 0;
+
+        for (ksize = KMALLOC_SIZE_MAX; ksize >= KMALLOC_SIZE_MIN; ksize /= 2) {
+                buf = kmalloc(ksize, GFP_NOFS);
+                if (buf != NULL)
+                        break;
+        }
+        if (ksize < KMALLOC_SIZE_MIN)
+                return -ENOMEM;
+        maxmembs = ksize / argv->v_size;
+
+        ret = 0;
+        total = 0;
+        for (i = 0; i < argv->v_nmembs; i += n) {
+                n = (argv->v_nmembs - i < maxmembs) ?
+                        argv->v_nmembs - i : maxmembs;
+                if ((dir & _IOC_WRITE) &&
+                    copy_from_user(buf,
+                            (void __user *)argv->v_base + argv->v_size * i,
+                            argv->v_size * n)) {
+                        ret = -EFAULT;
+                        break;
+                }
+                nr = (*dofunc)(nilfs, argv->v_index + i, argv->v_flags, buf,
+                               argv->v_size, n);
+                if (nr < 0) {
+                        ret = nr;
+                        break;
+                }
+                if ((dir & _IOC_READ) &&
+                    copy_to_user(
+                            (void __user *)argv->v_base + argv->v_size * i,
+                            buf, argv->v_size * nr)) {
+                        ret = -EFAULT;
+                        break;
+                }
+                total += nr;
+        }
+        argv->v_nmembs = total;
+
+        kfree(buf);
+        return ret;
+}
+
+static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
+                                     unsigned int cmd, void __user *argp)
+{
+        struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
+        struct nilfs_transaction_info ti;
+        struct nilfs_cpmode cpmode;
+        int ret;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
+                return -EFAULT;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_cpfile_change_cpmode(
+                cpfile, cpmode.cm_cno, cpmode.cm_mode);
+        nilfs_transaction_end(inode->i_sb, !ret);
+        return ret;
+}
+
+static int
+nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
+                              unsigned int cmd, void __user *argp)
+{
+        struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
+        struct nilfs_transaction_info ti;
+        __u64 cno;
+        int ret;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        if (copy_from_user(&cno, argp, sizeof(cno)))
+                return -EFAULT;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_cpfile_delete_checkpoint(cpfile, cno);
+        nilfs_transaction_end(inode->i_sb, !ret);
+        return ret;
+}
+
+static ssize_t
+nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, int index, int flags,
+                          void *buf, size_t size, size_t nmembs)
+{
+        return nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, index, flags, buf,
+                                       nmembs);
+}
+
+static int nilfs_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
+                                  unsigned int cmd, void __user *argp)
+{
+        struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
+        struct nilfs_argv argv;
+        struct nilfs_transaction_info ti;
+        int ret;
+
+        if (copy_from_user(&argv, argp, sizeof(argv)))
+                return -EFAULT;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
+                                    nilfs_ioctl_do_get_cpinfo);
+        nilfs_transaction_end(inode->i_sb, 0);
+
+        if (copy_to_user(argp, &argv, sizeof(argv)))
+                ret = -EFAULT;
+        return ret;
+}
+
+static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
+                                  unsigned int cmd, void __user *argp)
+{
+        struct inode *cpfile = NILFS_SB(inode->i_sb)->s_nilfs->ns_cpfile;
+        struct nilfs_cpstat cpstat;
+        struct nilfs_transaction_info ti;
+        int ret;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_cpfile_get_stat(cpfile, &cpstat);
+        nilfs_transaction_end(inode->i_sb, 0);
+        if (ret < 0)
+                return ret;
+
+        if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
+                ret = -EFAULT;
+        return ret;
+}
+
+static ssize_t
+nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, int index, int flags,
+                          void *buf, size_t size, size_t nmembs)
+{
+        return nilfs_sufile_get_suinfo(nilfs->ns_sufile, index, buf, nmembs);
+}
+
+static int nilfs_ioctl_get_suinfo(struct inode *inode, struct file *filp,
+                                  unsigned int cmd, void __user *argp)
+{
+        struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
+        struct nilfs_argv argv;
+        struct nilfs_transaction_info ti;
+        int ret;
+
+        if (copy_from_user(&argv, argp, sizeof(argv)))
+                return -EFAULT;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
+                                    nilfs_ioctl_do_get_suinfo);
+        nilfs_transaction_end(inode->i_sb, 0);
+
+        if (copy_to_user(argp, &argv, sizeof(argv)))
+                ret = -EFAULT;
+        return ret;
+}
+
+static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
+                                  unsigned int cmd, void __user *argp)
+{
+        struct inode *sufile = NILFS_SB(inode->i_sb)->s_nilfs->ns_sufile;
+        struct nilfs_sustat sustat;
+        struct nilfs_transaction_info ti;
+        int ret;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_sufile_get_stat(sufile, &sustat);
+        nilfs_transaction_end(inode->i_sb, 0);
+        if (ret < 0)
+                return ret;
+
+        if (copy_to_user(argp, &sustat, sizeof(sustat)))
+                ret = -EFAULT;
+        return ret;
+}
+
+static ssize_t
+nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, int index, int flags,
+                         void *buf, size_t size, size_t nmembs)
+{
+        return nilfs_dat_get_vinfo(nilfs_dat_inode(nilfs), buf, nmembs);
+}
+
+static int nilfs_ioctl_get_vinfo(struct inode *inode, struct file *filp,
+                                 unsigned int cmd, void __user *argp)
+{
+        struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
+        struct nilfs_argv argv;
+        struct nilfs_transaction_info ti;
+        int ret;
+
+        if (copy_from_user(&argv, argp, sizeof(argv)))
+                return -EFAULT;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
+                                    nilfs_ioctl_do_get_vinfo);
+        nilfs_transaction_end(inode->i_sb, 0);
+
+        if (copy_to_user(argp, &argv, sizeof(argv)))
+                ret = -EFAULT;
+        return ret;
+}
+
+static ssize_t
+nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, int index, int flags,
+                          void *buf, size_t size, size_t nmembs)
+{
+        struct inode *dat = nilfs_dat_inode(nilfs);
+        struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
+        struct nilfs_bdesc *bdescs = buf;
+        int ret, i;
+
+        for (i = 0; i < nmembs; i++) {
+                ret = nilfs_bmap_lookup_at_level(bmap,
+                                                 bdescs[i].bd_offset,
+                                                 bdescs[i].bd_level + 1,
+                                                 &bdescs[i].bd_blocknr);
+                if (ret < 0) {
+                        if (ret != -ENOENT)
+                                return ret;
+                        bdescs[i].bd_blocknr = 0;
+                }
+        }
+        return nmembs;
+}
+
+static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
+                                  unsigned int cmd, void __user *argp)
+{
+        struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
+        struct nilfs_argv argv;
+        struct nilfs_transaction_info ti;
+        int ret;
+
+        if (copy_from_user(&argv, argp, sizeof(argv)))
+                return -EFAULT;
+
+        nilfs_transaction_begin(inode->i_sb, &ti, 0);
+        ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
+                                    nilfs_ioctl_do_get_bdescs);
+        nilfs_transaction_end(inode->i_sb, 0);
+
+        if (copy_to_user(argp, &argv, sizeof(argv)))
+                ret = -EFAULT;
+        return ret;
+}
+
+static int nilfs_ioctl_move_inode_block(struct inode *inode,
+                                        struct nilfs_vdesc *vdesc,
+                                        struct list_head *buffers)
+{
+        struct buffer_head *bh;
+        int ret;
+
+        if (vdesc->vd_flags == 0)
+                ret = nilfs_gccache_submit_read_data(
+                        inode, vdesc->vd_offset, vdesc->vd_blocknr,
+                        vdesc->vd_vblocknr, &bh);
+        else
+                ret = nilfs_gccache_submit_read_node(
+                        inode, vdesc->vd_blocknr, vdesc->vd_vblocknr, &bh);
+
+        if (unlikely(ret < 0)) {
+                if (ret == -ENOENT)
+                        printk(KERN_CRIT
+                               "%s: invalid virtual block address (%s): "
+                               "ino=%llu, cno=%llu, offset=%llu, "
+                               "blocknr=%llu, vblocknr=%llu\n",
+                               __func__, vdesc->vd_flags ? "node" : "data",
+                               (unsigned long long)vdesc->vd_ino,
+                               (unsigned long long)vdesc->vd_cno,
+                               (unsigned long long)vdesc->vd_offset,
+                               (unsigned long long)vdesc->vd_blocknr,
+                               (unsigned long long)vdesc->vd_vblocknr);
+                return ret;
+        }
+        bh->b_private = vdesc;
+        list_add_tail(&bh->b_assoc_buffers, buffers);
+        return 0;
+}
+
+static ssize_t
+nilfs_ioctl_do_move_blocks(struct the_nilfs *nilfs, int index, int flags,
+                           void *buf, size_t size, size_t nmembs)
+{
+        struct inode *inode;
+        struct nilfs_vdesc *vdesc;
+        struct buffer_head *bh, *n;
+        LIST_HEAD(buffers);
+        ino_t ino;
+        __u64 cno;
+        int i, ret;
+
+        for (i = 0, vdesc = buf; i < nmembs; ) {
+                ino = vdesc->vd_ino;
+                cno = vdesc->vd_cno;
+                inode = nilfs_gc_iget(nilfs, ino, cno);
+                if (unlikely(inode == NULL)) {
+                        ret = -ENOMEM;
+                        goto failed;
+                }
+                do {
+                        ret = nilfs_ioctl_move_inode_block(inode, vdesc,
+                                                           &buffers);
+                        if (unlikely(ret < 0))
+                                goto failed;
+                        vdesc++;
+                } while (++i < nmembs &&
+                         vdesc->vd_ino == ino && vdesc->vd_cno == cno);
+        }
+
+        list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
+                ret = nilfs_gccache_wait_and_mark_dirty(bh);
+                if (unlikely(ret < 0)) {
+                        if (ret == -EEXIST) {
+                                vdesc = bh->b_private;
+                                printk(KERN_CRIT
+                                       "%s: conflicting %s buffer: "
+                                       "ino=%llu, cno=%llu, offset=%llu, "
+                                       "blocknr=%llu, vblocknr=%llu\n",
+                                       __func__,
+                                       vdesc->vd_flags ? "node" : "data",
+                                       (unsigned long long)vdesc->vd_ino,
+                                       (unsigned long long)vdesc->vd_cno,
+                                       (unsigned long long)vdesc->vd_offset,
+                                       (unsigned long long)vdesc->vd_blocknr,
+                                       (unsigned long long)vdesc->vd_vblocknr);
+                        }
+                        goto failed;
+                }
+                list_del_init(&bh->b_assoc_buffers);
+                bh->b_private = NULL;
+                brelse(bh);
+        }
+        return nmembs;
+
+ failed:
+        list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
+                list_del_init(&bh->b_assoc_buffers);
+                bh->b_private = NULL;
+                brelse(bh);
+        }
+        return ret;
+}
+
+static inline int nilfs_ioctl_move_blocks(struct the_nilfs *nilfs,
+                                          struct nilfs_argv *argv,
+                                          int dir)
+{
+        return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
+                                     nilfs_ioctl_do_move_blocks);
+}
+
+static ssize_t
+nilfs_ioctl_do_delete_checkpoints(struct the_nilfs *nilfs, int index,
+                                  int flags, void *buf, size_t size,
+                                  size_t nmembs)
+{
+        struct inode *cpfile = nilfs->ns_cpfile;
+        struct nilfs_period *periods = buf;
+        int ret, i;
+
+        for (i = 0; i < nmembs; i++) {
+                ret = nilfs_cpfile_delete_checkpoints(
+                        cpfile, periods[i].p_start, periods[i].p_end);
+                if (ret < 0)
+                        return ret;
+        }
+        return nmembs;
+}
+
+static inline int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
+                                                 struct nilfs_argv *argv,
+                                                 int dir)
+{
+        return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
+                                     nilfs_ioctl_do_delete_checkpoints);
+}
+
+static ssize_t
+nilfs_ioctl_do_free_vblocknrs(struct the_nilfs *nilfs, int index, int flags,
+                              void *buf, size_t size, size_t nmembs)
+{
+        int ret = nilfs_dat_freev(nilfs_dat_inode(nilfs), buf, nmembs);
+
+        return (ret < 0) ? ret : nmembs;
+}
+
+static inline int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
+                                             struct nilfs_argv *argv,
+                                             int dir)
+{
+        return nilfs_ioctl_wrap_copy(nilfs, argv, dir,
+                                     nilfs_ioctl_do_free_vblocknrs);
+}
+
+static ssize_t
+nilfs_ioctl_do_mark_blocks_dirty(struct the_nilfs *nilfs, int index, int flags,
+                                 void *buf, size_t size, size_t nmembs)
+{
+        struct inode *dat = nilfs_dat_inode(nilfs);
+        struct nilfs_bmap *bmap = NILFS_I(dat)->i_bmap;
+        struct nilfs_bdesc *bdescs = buf;
+        int ret, i;
+
+        for (i = 0; i < nmembs; i++) {
+                /* XXX: use macro or inline func to check liveness */
+                ret = nilfs_bmap_lookup_at_level(bmap,
+                                                 bdescs[i].bd_offset,
+                                                 bdescs[i].bd_level + 1,
+                                                 &bdescs[i].bd_blocknr);
+                if (ret < 0) {
+                        if (ret != -ENOENT)
+                                return ret;
+                        bdescs[i].bd_blocknr = 0;
+                }
+                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) {
+                                BUG_ON(ret == -ENOENT);
+                                return ret;
+                        }
+                } else {
+                        ret = nilfs_bmap_mark(bmap, bdescs[i].bd_offset,
+                                              bdescs[i].bd_level);
+                        if (ret < 0) {
+                                BUG_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, int index, int flags,
+                             void *buf, size_t size, size_t nmembs)
+{
+        struct nilfs_sb_info *sbi = nilfs_get_writer(nilfs);
+        int ret;
+
+        BUG_ON(!sbi);
+        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];
+        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)
+                goto out_move_blks;
+        ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], dir);
+        if (ret < 0)
+                goto out_del_cps;
+        ret = nilfs_ioctl_free_vblocknrs(nilfs, &argv[2], dir);
+        if (ret < 0)
+                goto out_free_vbns;
+        ret = nilfs_ioctl_mark_blocks_dirty(nilfs, &argv[3], dir);
+        if (ret < 0)
+                goto out_free_vbns;
+        ret = nilfs_ioctl_free_segments(nilfs, &argv[4], dir);
+        if (ret < 0)
+                goto out_free_segs;
+
+        return 0;
+
+ out_free_segs:
+        BUG(); /* XXX: not implemented yet */
+ out_free_vbns:
+        BUG();/* XXX: not implemented yet */
+ out_del_cps:
+        BUG();/* XXX: not implemented yet */
+ out_move_blks:
+        nilfs_remove_all_gcinode(nilfs);
+        return ret;
+}
+
+static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
+                                      unsigned int cmd, void __user *argp)
+{
+        int ret;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        ret = nilfs_clean_segments(inode->i_sb, argp);
+        clear_nilfs_cond_nongc_write(NILFS_SB(inode->i_sb)->s_nilfs);
+        return ret;
+}
+
+static int nilfs_ioctl_test_cond(struct the_nilfs *nilfs, int cond)
+{
+        return (cond & NILFS_TIMEDWAIT_SEG_WRITE) &&
+                nilfs_cond_nongc_write(nilfs);
+}
+
+static void nilfs_ioctl_clear_cond(struct the_nilfs *nilfs, int cond)
+{
+        if (cond & NILFS_TIMEDWAIT_SEG_WRITE)
+                clear_nilfs_cond_nongc_write(nilfs);
+}
+
+static int nilfs_ioctl_timedwait(struct inode *inode, struct file *filp,
+                                 unsigned int cmd, void __user *argp)
+{
+        struct the_nilfs *nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
+        struct nilfs_wait_cond wc;
+        long ret;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+        if (copy_from_user(&wc, argp, sizeof(wc)))
+                return -EFAULT;
+
+        unlock_kernel();
+        ret = wc.wc_flags ?
+                wait_event_interruptible_timeout(
+                        nilfs->ns_cleanerd_wq,
+                        nilfs_ioctl_test_cond(nilfs, wc.wc_cond),
+                        timespec_to_jiffies(&wc.wc_timeout)) :
+                wait_event_interruptible(
+                        nilfs->ns_cleanerd_wq,
+                        nilfs_ioctl_test_cond(nilfs, wc.wc_cond));
+        lock_kernel();
+        nilfs_ioctl_clear_cond(nilfs, wc.wc_cond);
+
+        if (ret > 0) {
+                jiffies_to_timespec(ret, &wc.wc_timeout);
+                if (copy_to_user(argp, &wc, sizeof(wc)))
+                        return -EFAULT;
+                return 0;
+        }
+        if (ret != 0)
+                return -EINTR;
+
+        return wc.wc_flags ? -ETIME : 0;
+}
+
+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;
+}
+
+int nilfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+                unsigned long arg)
+{
+        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_TIMEDWAIT:
+                return nilfs_ioctl_timedwait(inode, filp, cmd, argp);
+        case NILFS_IOCTL_SYNC:
+                return nilfs_ioctl_sync(inode, filp, cmd, argp);
+        default:
+                return -ENOTTY;
+        }
+}
+
+/* compat_ioctl */
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+
+static int nilfs_compat_locked_ioctl(struct inode *inode, struct file *filp,
+                                     unsigned int cmd, unsigned long arg)
+{
+        int ret;
+
+        lock_kernel();
+        ret = nilfs_ioctl(inode, filp, cmd, arg);
+        unlock_kernel();
+        return ret;
+}
+
+static int
+nilfs_compat_ioctl_uargv32_to_uargv(struct nilfs_argv32 __user *uargv32,
+                                    struct nilfs_argv __user *uargv)
+{
+        compat_uptr_t base;
+        compat_size_t nmembs, size;
+        compat_int_t index, flags;
+
+        if (get_user(base, &uargv32->v_base) ||
+            put_user(compat_ptr(base), &uargv->v_base) ||
+            get_user(nmembs, &uargv32->v_nmembs) ||
+            put_user(nmembs, &uargv->v_nmembs) ||
+            get_user(size, &uargv32->v_size) ||
+            put_user(size, &uargv->v_size) ||
+            get_user(index, &uargv32->v_index) ||
+            put_user(index, &uargv->v_index) ||
+            get_user(flags, &uargv32->v_flags) ||
+            put_user(flags, &uargv->v_flags))
+                return -EFAULT;
+        return 0;
+}
+
+static int
+nilfs_compat_ioctl_uargv_to_uargv32(struct nilfs_argv __user *uargv,
+                                    struct nilfs_argv32 __user *uargv32)
+{
+        size_t nmembs;
+
+        if (get_user(nmembs, &uargv->v_nmembs) ||
+            put_user(nmembs, &uargv32->v_nmembs))
+                return -EFAULT;
+        return 0;
+}
+
+static int
+nilfs_compat_ioctl_get_by_argv(struct inode *inode, struct file *filp,
+                               unsigned int cmd, unsigned long arg)
+{
+        struct nilfs_argv __user *uargv;
+        struct nilfs_argv32 __user *uargv32;
+        int ret;
+
+        uargv = compat_alloc_user_space(sizeof(struct nilfs_argv));
+        uargv32 = compat_ptr(arg);
+        ret = nilfs_compat_ioctl_uargv32_to_uargv(uargv32, uargv);
+        if (ret < 0)
+                return ret;
+
+        ret = nilfs_compat_locked_ioctl(inode, filp, cmd, (unsigned long)uargv);
+        if (ret < 0)
+                return ret;
+
+        return nilfs_compat_ioctl_uargv_to_uargv32(uargv, uargv32);
+}
+
+static int
+nilfs_compat_ioctl_change_cpmode(struct inode *inode, struct file *filp,
+                                 unsigned int cmd, unsigned long arg)
+{
+        struct nilfs_cpmode __user *ucpmode;
+        struct nilfs_cpmode32 __user *ucpmode32;
+        int mode;
+
+        ucpmode = compat_alloc_user_space(sizeof(struct nilfs_cpmode));
+        ucpmode32 = compat_ptr(arg);
+        if (copy_in_user(&ucpmode->cm_cno, &ucpmode32->cm_cno,
+                         sizeof(__u64)) ||
+            get_user(mode, &ucpmode32->cm_mode) ||
+            put_user(mode, &ucpmode->cm_mode))
+                return -EFAULT;
+
+        return nilfs_compat_locked_ioctl(
+                inode, filp, cmd, (unsigned long)ucpmode);
+}
+
+
+static inline int
+nilfs_compat_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
+                                     unsigned int cmd, unsigned long arg)
+{
+        return nilfs_compat_locked_ioctl(inode, filp, cmd, arg);
+}
+
+static inline int
+nilfs_compat_ioctl_get_cpinfo(struct inode *inode, struct file *filp,
+                              unsigned int cmd, unsigned long arg)
+{
+        return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
+}
+
+static inline int
+nilfs_compat_ioctl_get_cpstat(struct inode *inode, struct file *filp,
+                              unsigned int cmd, unsigned long arg)
+{
+        return nilfs_compat_locked_ioctl(inode, filp, cmd, arg);
+}
+
+static inline int
+nilfs_compat_ioctl_get_suinfo(struct inode *inode, struct file *filp,
+                              unsigned int cmd, unsigned long arg)
+{
+        return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
+}
+
+static int
+nilfs_compat_ioctl_get_sustat(struct inode *inode, struct file *filp,
+                              unsigned int cmd, unsigned long arg)
+{
+        struct nilfs_sustat __user *usustat;
+        struct nilfs_sustat32 __user *usustat32;
+        time_t ctime, nongc_ctime;
+        int ret;
+
+        usustat = compat_alloc_user_space(sizeof(struct nilfs_sustat));
+        ret = nilfs_compat_locked_ioctl(inode, filp, cmd,
+                                        (unsigned long)usustat);
+        if (ret < 0)
+                return ret;
+
+        usustat32 = compat_ptr(arg);
+        if (copy_in_user(&usustat32->ss_nsegs, &usustat->ss_nsegs,
+                         sizeof(__u64)) ||
+            copy_in_user(&usustat32->ss_ncleansegs, &usustat->ss_ncleansegs,
+                         sizeof(__u64)) ||
+            copy_in_user(&usustat32->ss_ndirtysegs, &usustat->ss_ndirtysegs,
+                         sizeof(__u64)) ||
+            get_user(ctime, &usustat->ss_ctime) ||
+            put_user(ctime, &usustat32->ss_ctime) ||
+            get_user(nongc_ctime, &usustat->ss_nongc_ctime) ||
+            put_user(nongc_ctime, &usustat32->ss_nongc_ctime))
+                return -EFAULT;
+        return 0;
+}
+
+static inline int
+nilfs_compat_ioctl_get_vinfo(struct inode *inode, struct file *filp,
+                              unsigned int cmd, unsigned long arg)
+{
+        return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
+}
+
+static inline int
+nilfs_compat_ioctl_get_bdescs(struct inode *inode, struct file *filp,
+                             unsigned int cmd, unsigned long arg)
+{
+        return nilfs_compat_ioctl_get_by_argv(inode, filp, cmd, arg);
+}
+
+static int
+nilfs_compat_ioctl_clean_segments(struct inode *inode, struct file *filp,
+                                  unsigned int cmd, unsigned long arg)
+{
+        struct nilfs_argv __user *uargv;
+        struct nilfs_argv32 __user *uargv32;
+        int i, ret;
+
+        uargv = compat_alloc_user_space(sizeof(struct nilfs_argv) * 5);
+        uargv32 = compat_ptr(arg);
+        for (i = 0; i < 5; i++) {
+                ret = nilfs_compat_ioctl_uargv32_to_uargv(&uargv32[i],
+                                                          &uargv[i]);
+                if (ret < 0)
+                        return ret;
+        }
+        return nilfs_compat_locked_ioctl(
+                inode, filp, cmd, (unsigned long)uargv);
+}
+
+static int
+nilfs_compat_ioctl_timedwait(struct inode *inode, struct file *filp,
+                             unsigned int cmd, unsigned long arg)
+{
+        struct nilfs_wait_cond __user *uwcond;
+        struct nilfs_wait_cond32 __user *uwcond32;
+        struct timespec ts;
+        int cond, flags, ret;
+
+        uwcond = compat_alloc_user_space(sizeof(struct nilfs_wait_cond));
+        uwcond32 = compat_ptr(arg);
+        if (get_user(cond, &uwcond32->wc_cond) ||
+            put_user(cond, &uwcond->wc_cond) ||
+            get_user(flags, &uwcond32->wc_flags) ||
+            put_user(flags, &uwcond->wc_flags) ||
+            get_user(ts.tv_sec, &uwcond32->wc_timeout.tv_sec) ||
+            get_user(ts.tv_nsec, &uwcond32->wc_timeout.tv_nsec) ||
+            put_user(ts.tv_sec, &uwcond->wc_timeout.tv_sec) ||
+            put_user(ts.tv_nsec, &uwcond->wc_timeout.tv_nsec))
+                return -EFAULT;
+
+        ret = nilfs_compat_locked_ioctl(inode, filp, cmd,
+                                        (unsigned long)uwcond);
+        if (ret < 0)
+                return ret;
+
+        if (get_user(ts.tv_sec, &uwcond->wc_timeout.tv_sec) ||
+            get_user(ts.tv_nsec, &uwcond->wc_timeout.tv_nsec) ||
+            put_user(ts.tv_sec, &uwcond32->wc_timeout.tv_sec) ||
+            put_user(ts.tv_nsec, &uwcond32->wc_timeout.tv_nsec))
+                return -EFAULT;
+
+        return 0;
+}
+
+static int nilfs_compat_ioctl_sync(struct inode *inode, struct file *filp,
+                                   unsigned int cmd, unsigned long arg)
+{
+        return nilfs_compat_locked_ioctl(inode, filp, cmd, arg);
+}
+
+long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+        struct inode *inode = filp->f_dentry->d_inode;
+
+        switch (cmd) {
+        case NILFS_IOCTL32_CHANGE_CPMODE:
+                return nilfs_compat_ioctl_change_cpmode(
+                        inode, filp, NILFS_IOCTL_CHANGE_CPMODE, arg);
+        case NILFS_IOCTL_DELETE_CHECKPOINT:
+                return nilfs_compat_ioctl_delete_checkpoint(
+                        inode, filp, cmd, arg);
+        case NILFS_IOCTL32_GET_CPINFO:
+                return nilfs_compat_ioctl_get_cpinfo(
+                        inode, filp, NILFS_IOCTL_GET_CPINFO, arg);
+        case NILFS_IOCTL_GET_CPSTAT:
+                return nilfs_compat_ioctl_get_cpstat(inode, filp, cmd, arg);
+        case NILFS_IOCTL32_GET_SUINFO:
+                return nilfs_compat_ioctl_get_suinfo(
+                        inode, filp, NILFS_IOCTL_GET_SUINFO, arg);
+        case NILFS_IOCTL32_GET_SUSTAT:
+                return nilfs_compat_ioctl_get_sustat(
+                        inode, filp, NILFS_IOCTL_GET_SUSTAT, arg);
+        case NILFS_IOCTL32_GET_VINFO:
+                return nilfs_compat_ioctl_get_vinfo(
+                        inode, filp, NILFS_IOCTL_GET_VINFO, arg);
+        case NILFS_IOCTL32_GET_BDESCS:
+                return nilfs_compat_ioctl_get_bdescs(
+                        inode, filp, NILFS_IOCTL_GET_BDESCS, arg);
+        case NILFS_IOCTL32_CLEAN_SEGMENTS:
+                return nilfs_compat_ioctl_clean_segments(
+                        inode, filp, NILFS_IOCTL_CLEAN_SEGMENTS, arg);
+        case NILFS_IOCTL32_TIMEDWAIT:
+                return nilfs_compat_ioctl_timedwait(
+                        inode, filp, NILFS_IOCTL_TIMEDWAIT, arg);
+        case NILFS_IOCTL_SYNC:
+                return nilfs_compat_ioctl_sync(inode, filp, cmd, arg);
+        default:
+                return -ENOIOCTLCMD;
+        }
+}
+#endif