Commit 7942b919 authored by Koji Sato's avatar Koji Sato Committed by Linus Torvalds
Browse files

nilfs2: ioctl operations



This adds userland interface implemented with ioctl.

Signed-off-by: default avatarKoji Sato <sato.koji@lab.ntt.co.jp>
Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a3d93f70
/*
* 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;
}