linux/fs/nilfs2/ioctl.c
Deepa Dinamani 078cd8279e fs: Replace CURRENT_TIME with current_time() for inode timestamps
CURRENT_TIME macro is not appropriate for filesystems as it
doesn't use the right granularity for filesystem timestamps.
Use current_time() instead.

CURRENT_TIME is also not y2038 safe.

This is also in preparation for the patch that transitions
vfs timestamps to use 64 bit time and hence make them
y2038 safe. As part of the effort current_time() will be
extended to do range checks. Hence, it is necessary for all
file system timestamps to use current_time(). Also,
current_time() will be transitioned along with vfs to be
y2038 safe.

Note that whenever a single call to current_time() is used
to change timestamps in different inodes, it is because they
share the same time granularity.

Signed-off-by: Deepa Dinamani <deepa.kernel@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Felipe Balbi <balbi@kernel.org>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Acked-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Acked-by: David Sterba <dsterba@suse.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-09-27 21:06:21 -04:00

1378 lines
36 KiB
C

/*
* 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.
*
* Written by Koji Sato.
*/
#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/capability.h> /* capable() */
#include <linux/uaccess.h> /* copy_from_user(), copy_to_user() */
#include <linux/vmalloc.h>
#include <linux/compat.h> /* compat_ptr() */
#include <linux/mount.h> /* mnt_want_write_file(), mnt_drop_write_file() */
#include <linux/buffer_head.h>
#include "nilfs.h"
#include "segment.h"
#include "bmap.h"
#include "cpfile.h"
#include "sufile.h"
#include "dat.h"
/**
* nilfs_ioctl_wrap_copy - wrapping function of get/set metadata info
* @nilfs: nilfs object
* @argv: vector of arguments from userspace
* @dir: set of direction flags
* @dofunc: concrete function of get/set metadata info
*
* Description: nilfs_ioctl_wrap_copy() gets/sets metadata info by means of
* calling dofunc() function on the basis of @argv argument.
*
* Return Value: On success, 0 is returned and requested metadata info
* is copied into userspace. On error, one of the following
* negative error codes is returned.
*
* %-EINVAL - Invalid arguments from userspace.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-EFAULT - Failure during execution of requested operation.
*/
static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
struct nilfs_argv *argv, int dir,
ssize_t (*dofunc)(struct the_nilfs *,
__u64 *, int,
void *, size_t, size_t))
{
void *buf;
void __user *base = (void __user *)(unsigned long)argv->v_base;
size_t maxmembs, total, n;
ssize_t nr;
int ret, i;
__u64 pos, ppos;
if (argv->v_nmembs == 0)
return 0;
if (argv->v_size > PAGE_SIZE)
return -EINVAL;
/*
* Reject pairs of a start item position (argv->v_index) and a
* total count (argv->v_nmembs) which leads position 'pos' to
* overflow by the increment at the end of the loop.
*/
if (argv->v_index > ~(__u64)0 - argv->v_nmembs)
return -EINVAL;
buf = (void *)__get_free_pages(GFP_NOFS, 0);
if (unlikely(!buf))
return -ENOMEM;
maxmembs = PAGE_SIZE / argv->v_size;
ret = 0;
total = 0;
pos = argv->v_index;
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, base + argv->v_size * i,
argv->v_size * n)) {
ret = -EFAULT;
break;
}
ppos = pos;
nr = dofunc(nilfs, &pos, argv->v_flags, buf, argv->v_size,
n);
if (nr < 0) {
ret = nr;
break;
}
if ((dir & _IOC_READ) &&
copy_to_user(base + argv->v_size * i, buf,
argv->v_size * nr)) {
ret = -EFAULT;
break;
}
total += nr;
if ((size_t)nr < n)
break;
if (pos == ppos)
pos += n;
}
argv->v_nmembs = total;
free_pages((unsigned long)buf, 0);
return ret;
}
/**
* nilfs_ioctl_getflags - ioctl to support lsattr
*/
static int nilfs_ioctl_getflags(struct inode *inode, void __user *argp)
{
unsigned int flags = NILFS_I(inode)->i_flags & FS_FL_USER_VISIBLE;
return put_user(flags, (int __user *)argp);
}
/**
* nilfs_ioctl_setflags - ioctl to support chattr
*/
static int nilfs_ioctl_setflags(struct inode *inode, struct file *filp,
void __user *argp)
{
struct nilfs_transaction_info ti;
unsigned int flags, oldflags;
int ret;
if (!inode_owner_or_capable(inode))
return -EACCES;
if (get_user(flags, (int __user *)argp))
return -EFAULT;
ret = mnt_want_write_file(filp);
if (ret)
return ret;
flags = nilfs_mask_flags(inode->i_mode, flags);
inode_lock(inode);
oldflags = NILFS_I(inode)->i_flags;
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by the
* relevant capability.
*/
ret = -EPERM;
if (((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) &&
!capable(CAP_LINUX_IMMUTABLE))
goto out;
ret = nilfs_transaction_begin(inode->i_sb, &ti, 0);
if (ret)
goto out;
NILFS_I(inode)->i_flags = (oldflags & ~FS_FL_USER_MODIFIABLE) |
(flags & FS_FL_USER_MODIFIABLE);
nilfs_set_inode_flags(inode);
inode->i_ctime = current_time(inode);
if (IS_SYNC(inode))
nilfs_set_transaction_flag(NILFS_TI_SYNC);
nilfs_mark_inode_dirty(inode);
ret = nilfs_transaction_commit(inode->i_sb);
out:
inode_unlock(inode);
mnt_drop_write_file(filp);
return ret;
}
/**
* nilfs_ioctl_getversion - get info about a file's version (generation number)
*/
static int nilfs_ioctl_getversion(struct inode *inode, void __user *argp)
{
return put_user(inode->i_generation, (int __user *)argp);
}
/**
* nilfs_ioctl_change_cpmode - change checkpoint mode (checkpoint/snapshot)
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: nilfs_ioctl_change_cpmode() function changes mode of
* given checkpoint between checkpoint and snapshot state. This ioctl
* is used in chcp and mkcp utilities.
*
* Return Value: On success, 0 is returned and mode of a checkpoint is
* changed. On error, one of the following negative error codes
* is returned.
*
* %-EPERM - Operation not permitted.
*
* %-EFAULT - Failure during checkpoint mode changing.
*/
static int nilfs_ioctl_change_cpmode(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_transaction_info ti;
struct nilfs_cpmode cpmode;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = mnt_want_write_file(filp);
if (ret)
return ret;
ret = -EFAULT;
if (copy_from_user(&cpmode, argp, sizeof(cpmode)))
goto out;
mutex_lock(&nilfs->ns_snapshot_mount_mutex);
nilfs_transaction_begin(inode->i_sb, &ti, 0);
ret = nilfs_cpfile_change_cpmode(
nilfs->ns_cpfile, cpmode.cm_cno, cpmode.cm_mode);
if (unlikely(ret < 0))
nilfs_transaction_abort(inode->i_sb);
else
nilfs_transaction_commit(inode->i_sb); /* never fails */
mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
out:
mnt_drop_write_file(filp);
return ret;
}
/**
* nilfs_ioctl_delete_checkpoint - remove checkpoint
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: nilfs_ioctl_delete_checkpoint() function removes
* checkpoint from NILFS2 file system. This ioctl is used in rmcp
* utility.
*
* Return Value: On success, 0 is returned and a checkpoint is
* removed. On error, one of the following negative error codes
* is returned.
*
* %-EPERM - Operation not permitted.
*
* %-EFAULT - Failure during checkpoint removing.
*/
static int
nilfs_ioctl_delete_checkpoint(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_transaction_info ti;
__u64 cno;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = mnt_want_write_file(filp);
if (ret)
return ret;
ret = -EFAULT;
if (copy_from_user(&cno, argp, sizeof(cno)))
goto out;
nilfs_transaction_begin(inode->i_sb, &ti, 0);
ret = nilfs_cpfile_delete_checkpoint(nilfs->ns_cpfile, cno);
if (unlikely(ret < 0))
nilfs_transaction_abort(inode->i_sb);
else
nilfs_transaction_commit(inode->i_sb); /* never fails */
out:
mnt_drop_write_file(filp);
return ret;
}
/**
* nilfs_ioctl_do_get_cpinfo - callback method getting info about checkpoints
* @nilfs: nilfs object
* @posp: pointer on array of checkpoint's numbers
* @flags: checkpoint mode (checkpoint or snapshot)
* @buf: buffer for storing checkponts' info
* @size: size in bytes of one checkpoint info item in array
* @nmembs: number of checkpoints in array (numbers and infos)
*
* Description: nilfs_ioctl_do_get_cpinfo() function returns info about
* requested checkpoints. The NILFS_IOCTL_GET_CPINFO ioctl is used in
* lscp utility and by nilfs_cleanerd daemon.
*
* Return value: count of nilfs_cpinfo structures in output buffer.
*/
static ssize_t
nilfs_ioctl_do_get_cpinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_cpfile_get_cpinfo(nilfs->ns_cpfile, posp, flags, buf,
size, nmembs);
up_read(&nilfs->ns_segctor_sem);
return ret;
}
/**
* nilfs_ioctl_get_cpstat - get checkpoints statistics
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: nilfs_ioctl_get_cpstat() returns information about checkpoints.
* The NILFS_IOCTL_GET_CPSTAT ioctl is used by lscp, rmcp utilities
* and by nilfs_cleanerd daemon.
*
* Return Value: On success, 0 is returned, and checkpoints information is
* copied into userspace pointer @argp. On error, one of the following
* negative error codes is returned.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-EFAULT - Failure during getting checkpoints statistics.
*/
static int nilfs_ioctl_get_cpstat(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_cpstat cpstat;
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_cpfile_get_stat(nilfs->ns_cpfile, &cpstat);
up_read(&nilfs->ns_segctor_sem);
if (ret < 0)
return ret;
if (copy_to_user(argp, &cpstat, sizeof(cpstat)))
ret = -EFAULT;
return ret;
}
/**
* nilfs_ioctl_do_get_suinfo - callback method getting segment usage info
* @nilfs: nilfs object
* @posp: pointer on array of segment numbers
* @flags: *not used*
* @buf: buffer for storing suinfo array
* @size: size in bytes of one suinfo item in array
* @nmembs: count of segment numbers and suinfos in array
*
* Description: nilfs_ioctl_do_get_suinfo() function returns segment usage
* info about requested segments. The NILFS_IOCTL_GET_SUINFO ioctl is used
* in lssu, nilfs_resize utilities and by nilfs_cleanerd daemon.
*
* Return value: count of nilfs_suinfo structures in output buffer.
*/
static ssize_t
nilfs_ioctl_do_get_suinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_sufile_get_suinfo(nilfs->ns_sufile, *posp, buf, size,
nmembs);
up_read(&nilfs->ns_segctor_sem);
return ret;
}
/**
* nilfs_ioctl_get_sustat - get segment usage statistics
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: nilfs_ioctl_get_sustat() returns segment usage statistics.
* The NILFS_IOCTL_GET_SUSTAT ioctl is used in lssu, nilfs_resize utilities
* and by nilfs_cleanerd daemon.
*
* Return Value: On success, 0 is returned, and segment usage information is
* copied into userspace pointer @argp. On error, one of the following
* negative error codes is returned.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-EFAULT - Failure during getting segment usage statistics.
*/
static int nilfs_ioctl_get_sustat(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_sustat sustat;
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_sufile_get_stat(nilfs->ns_sufile, &sustat);
up_read(&nilfs->ns_segctor_sem);
if (ret < 0)
return ret;
if (copy_to_user(argp, &sustat, sizeof(sustat)))
ret = -EFAULT;
return ret;
}
/**
* nilfs_ioctl_do_get_vinfo - callback method getting virtual blocks info
* @nilfs: nilfs object
* @posp: *not used*
* @flags: *not used*
* @buf: buffer for storing array of nilfs_vinfo structures
* @size: size in bytes of one vinfo item in array
* @nmembs: count of vinfos in array
*
* Description: nilfs_ioctl_do_get_vinfo() function returns information
* on virtual block addresses. The NILFS_IOCTL_GET_VINFO ioctl is used
* by nilfs_cleanerd daemon.
*
* Return value: count of nilfs_vinfo structures in output buffer.
*/
static ssize_t
nilfs_ioctl_do_get_vinfo(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
int ret;
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_dat_get_vinfo(nilfs->ns_dat, buf, size, nmembs);
up_read(&nilfs->ns_segctor_sem);
return ret;
}
/**
* nilfs_ioctl_do_get_bdescs - callback method getting disk block descriptors
* @nilfs: nilfs object
* @posp: *not used*
* @flags: *not used*
* @buf: buffer for storing array of nilfs_bdesc structures
* @size: size in bytes of one bdesc item in array
* @nmembs: count of bdescs in array
*
* Description: nilfs_ioctl_do_get_bdescs() function returns information
* about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
* is used by nilfs_cleanerd daemon.
*
* Return value: count of nilfs_bdescs structures in output buffer.
*/
static ssize_t
nilfs_ioctl_do_get_bdescs(struct the_nilfs *nilfs, __u64 *posp, int flags,
void *buf, size_t size, size_t nmembs)
{
struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
struct nilfs_bdesc *bdescs = buf;
int ret, i;
down_read(&nilfs->ns_segctor_sem);
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) {
up_read(&nilfs->ns_segctor_sem);
return ret;
}
bdescs[i].bd_blocknr = 0;
}
}
up_read(&nilfs->ns_segctor_sem);
return nmembs;
}
/**
* nilfs_ioctl_get_bdescs - get disk block descriptors
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: nilfs_ioctl_do_get_bdescs() function returns information
* about descriptors of disk block numbers. The NILFS_IOCTL_GET_BDESCS ioctl
* is used by nilfs_cleanerd daemon.
*
* Return Value: On success, 0 is returned, and disk block descriptors are
* copied into userspace pointer @argp. On error, one of the following
* negative error codes is returned.
*
* %-EINVAL - Invalid arguments from userspace.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-EFAULT - Failure during getting disk block descriptors.
*/
static int nilfs_ioctl_get_bdescs(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_argv argv;
int ret;
if (copy_from_user(&argv, argp, sizeof(argv)))
return -EFAULT;
if (argv.v_size != sizeof(struct nilfs_bdesc))
return -EINVAL;
ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd),
nilfs_ioctl_do_get_bdescs);
if (ret < 0)
return ret;
if (copy_to_user(argp, &argv, sizeof(argv)))
ret = -EFAULT;
return ret;
}
/**
* nilfs_ioctl_move_inode_block - prepare data/node block for moving by GC
* @inode: inode object
* @vdesc: descriptor of virtual block number
* @buffers: list of moving buffers
*
* Description: nilfs_ioctl_move_inode_block() function registers data/node
* buffer in the GC pagecache and submit read request.
*
* Return Value: On success, 0 is returned. On error, one of the following
* negative error codes is returned.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-ENOENT - Requested block doesn't exist.
*
* %-EEXIST - Blocks conflict is detected.
*/
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)
nilfs_msg(inode->i_sb, KERN_CRIT,
"%s: invalid virtual block address (%s): ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
__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;
}
if (unlikely(!list_empty(&bh->b_assoc_buffers))) {
nilfs_msg(inode->i_sb, KERN_CRIT,
"%s: conflicting %s buffer: ino=%llu, cno=%llu, offset=%llu, blocknr=%llu, vblocknr=%llu",
__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);
brelse(bh);
return -EEXIST;
}
list_add_tail(&bh->b_assoc_buffers, buffers);
return 0;
}
/**
* nilfs_ioctl_move_blocks - move valid inode's blocks during garbage collection
* @sb: superblock object
* @argv: vector of arguments from userspace
* @buf: array of nilfs_vdesc structures
*
* Description: nilfs_ioctl_move_blocks() function reads valid data/node
* blocks that garbage collector specified with the array of nilfs_vdesc
* structures and stores them into page caches of GC inodes.
*
* Return Value: Number of processed nilfs_vdesc structures or
* error code, otherwise.
*/
static int nilfs_ioctl_move_blocks(struct super_block *sb,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
struct the_nilfs *nilfs = sb->s_fs_info;
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_iget_for_gc(sb, ino, cno);
if (IS_ERR(inode)) {
ret = PTR_ERR(inode);
goto failed;
}
if (list_empty(&NILFS_I(inode)->i_dirty)) {
/*
* Add the inode to GC inode list. Garbage Collection
* is serialized and no two processes manipulate the
* list simultaneously.
*/
igrab(inode);
list_add(&NILFS_I(inode)->i_dirty,
&nilfs->ns_gc_inodes);
}
do {
ret = nilfs_ioctl_move_inode_block(inode, vdesc,
&buffers);
if (unlikely(ret < 0)) {
iput(inode);
goto failed;
}
vdesc++;
} while (++i < nmembs &&
vdesc->vd_ino == ino && vdesc->vd_cno == cno);
iput(inode); /* The inode still remains in GC inode list */
}
list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
ret = nilfs_gccache_wait_and_mark_dirty(bh);
if (unlikely(ret < 0)) {
WARN_ON(ret == -EEXIST);
goto failed;
}
list_del_init(&bh->b_assoc_buffers);
brelse(bh);
}
return nmembs;
failed:
list_for_each_entry_safe(bh, n, &buffers, b_assoc_buffers) {
list_del_init(&bh->b_assoc_buffers);
brelse(bh);
}
return ret;
}
/**
* nilfs_ioctl_delete_checkpoints - delete checkpoints
* @nilfs: nilfs object
* @argv: vector of arguments from userspace
* @buf: array of periods of checkpoints numbers
*
* Description: nilfs_ioctl_delete_checkpoints() function deletes checkpoints
* in the period from p_start to p_end, excluding p_end itself. The checkpoints
* which have been already deleted are ignored.
*
* Return Value: Number of processed nilfs_period structures or
* error code, otherwise.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-EINVAL - invalid checkpoints.
*/
static int nilfs_ioctl_delete_checkpoints(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_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;
}
/**
* nilfs_ioctl_free_vblocknrs - free virtual block numbers
* @nilfs: nilfs object
* @argv: vector of arguments from userspace
* @buf: array of virtual block numbers
*
* Description: nilfs_ioctl_free_vblocknrs() function frees
* the virtual block numbers specified by @buf and @argv->v_nmembs.
*
* Return Value: Number of processed virtual block numbers or
* error code, otherwise.
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-ENOENT - The virtual block number have not been allocated.
*/
static int nilfs_ioctl_free_vblocknrs(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
int ret;
ret = nilfs_dat_freev(nilfs->ns_dat, buf, nmembs);
return (ret < 0) ? ret : nmembs;
}
/**
* nilfs_ioctl_mark_blocks_dirty - mark blocks dirty
* @nilfs: nilfs object
* @argv: vector of arguments from userspace
* @buf: array of block descriptors
*
* Description: nilfs_ioctl_mark_blocks_dirty() function marks
* metadata file or data blocks as dirty.
*
* Return Value: Number of processed block descriptors or
* error code, otherwise.
*
* %-ENOMEM - Insufficient memory available.
*
* %-EIO - I/O error
*
* %-ENOENT - the specified block does not exist (hole block)
*/
static int nilfs_ioctl_mark_blocks_dirty(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void *buf)
{
size_t nmembs = argv->v_nmembs;
struct nilfs_bmap *bmap = NILFS_I(nilfs->ns_dat)->i_bmap;
struct nilfs_bdesc *bdescs = buf;
struct buffer_head *bh;
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_get_block(nilfs->ns_dat,
bdescs[i].bd_offset,
false, NULL, &bh);
if (unlikely(ret)) {
WARN_ON(ret == -ENOENT);
return ret;
}
mark_buffer_dirty(bh);
nilfs_mdt_mark_dirty(nilfs->ns_dat);
put_bh(bh);
} 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;
}
int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *nilfs,
struct nilfs_argv *argv, void **kbufs)
{
const char *msg;
int ret;
ret = nilfs_ioctl_delete_checkpoints(nilfs, &argv[1], kbufs[1]);
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], kbufs[2]);
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], kbufs[3]);
if (ret < 0) {
/*
* can safely abort because the operation is nondestructive.
*/
msg = "cannot mark copying blocks dirty";
goto failed;
}
return 0;
failed:
nilfs_msg(nilfs->ns_sb, KERN_ERR, "error %d preparing GC: %s", ret,
msg);
return ret;
}
/**
* nilfs_ioctl_clean_segments - clean segments
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: nilfs_ioctl_clean_segments() function makes garbage
* collection operation in the environment of requested parameters
* from userspace. The NILFS_IOCTL_CLEAN_SEGMENTS ioctl is used by
* nilfs_cleanerd daemon.
*
* Return Value: On success, 0 is returned or error code, otherwise.
*/
static int nilfs_ioctl_clean_segments(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct nilfs_argv argv[5];
static const size_t argsz[5] = {
sizeof(struct nilfs_vdesc),
sizeof(struct nilfs_period),
sizeof(__u64),
sizeof(struct nilfs_bdesc),
sizeof(__u64),
};
void __user *base;
void *kbufs[5];
struct the_nilfs *nilfs;
size_t len, nsegs;
int n, ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = mnt_want_write_file(filp);
if (ret)
return ret;
ret = -EFAULT;
if (copy_from_user(argv, argp, sizeof(argv)))
goto out;
ret = -EINVAL;
nsegs = argv[4].v_nmembs;
if (argv[4].v_size != argsz[4])
goto out;
if (nsegs > UINT_MAX / sizeof(__u64))
goto out;
/*
* argv[4] points to segment numbers this ioctl cleans. We
* use kmalloc() for its buffer because memory used for the
* segment numbers is enough small.
*/
kbufs[4] = memdup_user((void __user *)(unsigned long)argv[4].v_base,
nsegs * sizeof(__u64));
if (IS_ERR(kbufs[4])) {
ret = PTR_ERR(kbufs[4]);
goto out;
}
nilfs = inode->i_sb->s_fs_info;
for (n = 0; n < 4; n++) {
ret = -EINVAL;
if (argv[n].v_size != argsz[n])
goto out_free;
if (argv[n].v_nmembs > nsegs * nilfs->ns_blocks_per_segment)
goto out_free;
if (argv[n].v_nmembs >= UINT_MAX / argv[n].v_size)
goto out_free;
len = argv[n].v_size * argv[n].v_nmembs;
base = (void __user *)(unsigned long)argv[n].v_base;
if (len == 0) {
kbufs[n] = NULL;
continue;
}
kbufs[n] = vmalloc(len);
if (!kbufs[n]) {
ret = -ENOMEM;
goto out_free;
}
if (copy_from_user(kbufs[n], base, len)) {
ret = -EFAULT;
vfree(kbufs[n]);
goto out_free;
}
}
/*
* nilfs_ioctl_move_blocks() will call nilfs_iget_for_gc(),
* which will operates an inode list without blocking.
* To protect the list from concurrent operations,
* nilfs_ioctl_move_blocks should be atomic operation.
*/
if (test_and_set_bit(THE_NILFS_GC_RUNNING, &nilfs->ns_flags)) {
ret = -EBUSY;
goto out_free;
}
ret = nilfs_ioctl_move_blocks(inode->i_sb, &argv[0], kbufs[0]);
if (ret < 0) {
nilfs_msg(inode->i_sb, KERN_ERR,
"error %d preparing GC: cannot read source blocks",
ret);
} else {
if (nilfs_sb_need_update(nilfs))
set_nilfs_discontinued(nilfs);
ret = nilfs_clean_segments(inode->i_sb, argv, kbufs);
}
nilfs_remove_all_gcinodes(nilfs);
clear_nilfs_gc_running(nilfs);
out_free:
while (--n >= 0)
vfree(kbufs[n]);
kfree(kbufs[4]);
out:
mnt_drop_write_file(filp);
return ret;
}
/**
* nilfs_ioctl_sync - make a checkpoint
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: nilfs_ioctl_sync() function constructs a logical segment
* for checkpointing. This function guarantees that all modified data
* and metadata are written out to the device when it successfully
* returned.
*
* Return Value: On success, 0 is retured. On errors, one of the following
* negative error code is returned.
*
* %-EROFS - Read only filesystem.
*
* %-EIO - I/O error
*
* %-ENOSPC - No space left on device (only in a panic state).
*
* %-ERESTARTSYS - Interrupted.
*
* %-ENOMEM - Insufficient memory available.
*
* %-EFAULT - Failure during execution of requested operation.
*/
static int nilfs_ioctl_sync(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
__u64 cno;
int ret;
struct the_nilfs *nilfs;
ret = nilfs_construct_segment(inode->i_sb);
if (ret < 0)
return ret;
nilfs = inode->i_sb->s_fs_info;
ret = nilfs_flush_device(nilfs);
if (ret < 0)
return ret;
if (argp != NULL) {
down_read(&nilfs->ns_segctor_sem);
cno = nilfs->ns_cno - 1;
up_read(&nilfs->ns_segctor_sem);
if (copy_to_user(argp, &cno, sizeof(cno)))
return -EFAULT;
}
return 0;
}
/**
* nilfs_ioctl_resize - resize NILFS2 volume
* @inode: inode object
* @filp: file object
* @argp: pointer on argument from userspace
*
* Return Value: On success, 0 is returned or error code, otherwise.
*/
static int nilfs_ioctl_resize(struct inode *inode, struct file *filp,
void __user *argp)
{
__u64 newsize;
int ret = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out;
ret = mnt_want_write_file(filp);
if (ret)
goto out;
ret = -EFAULT;
if (copy_from_user(&newsize, argp, sizeof(newsize)))
goto out_drop_write;
ret = nilfs_resize_fs(inode->i_sb, newsize);
out_drop_write:
mnt_drop_write_file(filp);
out:
return ret;
}
/**
* nilfs_ioctl_trim_fs() - trim ioctl handle function
* @inode: inode object
* @argp: pointer on argument from userspace
*
* Decription: nilfs_ioctl_trim_fs is the FITRIM ioctl handle function. It
* checks the arguments from userspace and calls nilfs_sufile_trim_fs, which
* performs the actual trim operation.
*
* Return Value: On success, 0 is returned or negative error code, otherwise.
*/
static int nilfs_ioctl_trim_fs(struct inode *inode, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct request_queue *q = bdev_get_queue(nilfs->ns_bdev);
struct fstrim_range range;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
if (copy_from_user(&range, argp, sizeof(range)))
return -EFAULT;
range.minlen = max_t(u64, range.minlen, q->limits.discard_granularity);
down_read(&nilfs->ns_segctor_sem);
ret = nilfs_sufile_trim_fs(nilfs->ns_sufile, &range);
up_read(&nilfs->ns_segctor_sem);
if (ret < 0)
return ret;
if (copy_to_user(argp, &range, sizeof(range)))
return -EFAULT;
return 0;
}
/**
* nilfs_ioctl_set_alloc_range - limit range of segments to be allocated
* @inode: inode object
* @argp: pointer on argument from userspace
*
* Decription: nilfs_ioctl_set_alloc_range() function defines lower limit
* of segments in bytes and upper limit of segments in bytes.
* The NILFS_IOCTL_SET_ALLOC_RANGE is used by nilfs_resize utility.
*
* Return Value: On success, 0 is returned or error code, otherwise.
*/
static int nilfs_ioctl_set_alloc_range(struct inode *inode, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
__u64 range[2];
__u64 minseg, maxseg;
unsigned long segbytes;
int ret = -EPERM;
if (!capable(CAP_SYS_ADMIN))
goto out;
ret = -EFAULT;
if (copy_from_user(range, argp, sizeof(__u64[2])))
goto out;
ret = -ERANGE;
if (range[1] > i_size_read(inode->i_sb->s_bdev->bd_inode))
goto out;
segbytes = nilfs->ns_blocks_per_segment * nilfs->ns_blocksize;
minseg = range[0] + segbytes - 1;
do_div(minseg, segbytes);
maxseg = NILFS_SB2_OFFSET_BYTES(range[1]);
do_div(maxseg, segbytes);
maxseg--;
ret = nilfs_sufile_set_alloc_range(nilfs->ns_sufile, minseg, maxseg);
out:
return ret;
}
/**
* nilfs_ioctl_get_info - wrapping function of get metadata info
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
* @membsz: size of an item in bytes
* @dofunc: concrete function of getting metadata info
*
* Description: nilfs_ioctl_get_info() gets metadata info by means of
* calling dofunc() function.
*
* Return Value: On success, 0 is returned and requested metadata info
* is copied into userspace. On error, one of the following
* negative error codes is returned.
*
* %-EINVAL - Invalid arguments from userspace.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-EFAULT - Failure during execution of requested operation.
*/
static int nilfs_ioctl_get_info(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp,
size_t membsz,
ssize_t (*dofunc)(struct the_nilfs *,
__u64 *, int,
void *, size_t, size_t))
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_argv argv;
int ret;
if (copy_from_user(&argv, argp, sizeof(argv)))
return -EFAULT;
if (argv.v_size < membsz)
return -EINVAL;
ret = nilfs_ioctl_wrap_copy(nilfs, &argv, _IOC_DIR(cmd), dofunc);
if (ret < 0)
return ret;
if (copy_to_user(argp, &argv, sizeof(argv)))
ret = -EFAULT;
return ret;
}
/**
* nilfs_ioctl_set_suinfo - set segment usage info
* @inode: inode object
* @filp: file object
* @cmd: ioctl's request code
* @argp: pointer on argument from userspace
*
* Description: Expects an array of nilfs_suinfo_update structures
* encapsulated in nilfs_argv and updates the segment usage info
* according to the flags in nilfs_suinfo_update.
*
* Return Value: On success, 0 is returned. On error, one of the
* following negative error codes is returned.
*
* %-EPERM - Not enough permissions
*
* %-EFAULT - Error copying input data
*
* %-EIO - I/O error.
*
* %-ENOMEM - Insufficient amount of memory available.
*
* %-EINVAL - Invalid values in input (segment number, flags or nblocks)
*/
static int nilfs_ioctl_set_suinfo(struct inode *inode, struct file *filp,
unsigned int cmd, void __user *argp)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_transaction_info ti;
struct nilfs_argv argv;
size_t len;
void __user *base;
void *kbuf;
int ret;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
ret = mnt_want_write_file(filp);
if (ret)
return ret;
ret = -EFAULT;
if (copy_from_user(&argv, argp, sizeof(argv)))
goto out;
ret = -EINVAL;
if (argv.v_size < sizeof(struct nilfs_suinfo_update))
goto out;
if (argv.v_nmembs > nilfs->ns_nsegments)
goto out;
if (argv.v_nmembs >= UINT_MAX / argv.v_size)
goto out;
len = argv.v_size * argv.v_nmembs;
if (!len) {
ret = 0;
goto out;
}
base = (void __user *)(unsigned long)argv.v_base;
kbuf = vmalloc(len);
if (!kbuf) {
ret = -ENOMEM;
goto out;
}
if (copy_from_user(kbuf, base, len)) {
ret = -EFAULT;
goto out_free;
}
nilfs_transaction_begin(inode->i_sb, &ti, 0);
ret = nilfs_sufile_set_suinfo(nilfs->ns_sufile, kbuf, argv.v_size,
argv.v_nmembs);
if (unlikely(ret < 0))
nilfs_transaction_abort(inode->i_sb);
else
nilfs_transaction_commit(inode->i_sb); /* never fails */
out_free:
vfree(kbuf);
out:
mnt_drop_write_file(filp);
return ret;
}
long nilfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file_inode(filp);
void __user *argp = (void __user *)arg;
switch (cmd) {
case FS_IOC_GETFLAGS:
return nilfs_ioctl_getflags(inode, argp);
case FS_IOC_SETFLAGS:
return nilfs_ioctl_setflags(inode, filp, argp);
case FS_IOC_GETVERSION:
return nilfs_ioctl_getversion(inode, argp);
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_info(inode, filp, cmd, argp,
sizeof(struct nilfs_cpinfo),
nilfs_ioctl_do_get_cpinfo);
case NILFS_IOCTL_GET_CPSTAT:
return nilfs_ioctl_get_cpstat(inode, filp, cmd, argp);
case NILFS_IOCTL_GET_SUINFO:
return nilfs_ioctl_get_info(inode, filp, cmd, argp,
sizeof(struct nilfs_suinfo),
nilfs_ioctl_do_get_suinfo);
case NILFS_IOCTL_SET_SUINFO:
return nilfs_ioctl_set_suinfo(inode, filp, cmd, argp);
case NILFS_IOCTL_GET_SUSTAT:
return nilfs_ioctl_get_sustat(inode, filp, cmd, argp);
case NILFS_IOCTL_GET_VINFO:
return nilfs_ioctl_get_info(inode, filp, cmd, argp,
sizeof(struct nilfs_vinfo),
nilfs_ioctl_do_get_vinfo);
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);
case NILFS_IOCTL_RESIZE:
return nilfs_ioctl_resize(inode, filp, argp);
case NILFS_IOCTL_SET_ALLOC_RANGE:
return nilfs_ioctl_set_alloc_range(inode, argp);
case FITRIM:
return nilfs_ioctl_trim_fs(inode, argp);
default:
return -ENOTTY;
}
}
#ifdef CONFIG_COMPAT
long nilfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
case FS_IOC32_GETFLAGS:
cmd = FS_IOC_GETFLAGS;
break;
case FS_IOC32_SETFLAGS:
cmd = FS_IOC_SETFLAGS;
break;
case FS_IOC32_GETVERSION:
cmd = FS_IOC_GETVERSION;
break;
case NILFS_IOCTL_CHANGE_CPMODE:
case NILFS_IOCTL_DELETE_CHECKPOINT:
case NILFS_IOCTL_GET_CPINFO:
case NILFS_IOCTL_GET_CPSTAT:
case NILFS_IOCTL_GET_SUINFO:
case NILFS_IOCTL_SET_SUINFO:
case NILFS_IOCTL_GET_SUSTAT:
case NILFS_IOCTL_GET_VINFO:
case NILFS_IOCTL_GET_BDESCS:
case NILFS_IOCTL_CLEAN_SEGMENTS:
case NILFS_IOCTL_SYNC:
case NILFS_IOCTL_RESIZE:
case NILFS_IOCTL_SET_ALLOC_RANGE:
break;
default:
return -ENOIOCTLCMD;
}
return nilfs_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif