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ioctl.c
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ioctl.c
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/*
* 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.