Commit 1e51764a authored by Artem Bityutskiy's avatar Artem Bityutskiy

UBIFS: add new flash file system

This is a new flash file system. See
http://www.linux-mtd.infradead.org/doc/ubifs.htmlSigned-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: default avatarAdrian Hunter <ext-adrian.hunter@nokia.com>
parent e56a99d5
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
* Copyright (C) 2006, 2007 University of Szeged, Hungary
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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
*
* Authors: Adrian Hunter
* Artem Bityutskiy (Битюцкий Артём)
* Zoltan Sogor
*/
/*
* This file provides a single place to access to compression and
* decompression.
*/
#include <linux/crypto.h>
#include "ubifs.h"
/* Fake description object for the "none" compressor */
static struct ubifs_compressor none_compr = {
.compr_type = UBIFS_COMPR_NONE,
.name = "no compression",
.capi_name = "",
};
#ifdef CONFIG_UBIFS_FS_LZO
static DEFINE_MUTEX(lzo_mutex);
static struct ubifs_compressor lzo_compr = {
.compr_type = UBIFS_COMPR_LZO,
.comp_mutex = &lzo_mutex,
.name = "LZO",
.capi_name = "lzo",
};
#else
static struct ubifs_compressor lzo_compr = {
.compr_type = UBIFS_COMPR_LZO,
.name = "LZO",
};
#endif
#ifdef CONFIG_UBIFS_FS_ZLIB
static DEFINE_MUTEX(deflate_mutex);
static DEFINE_MUTEX(inflate_mutex);
static struct ubifs_compressor zlib_compr = {
.compr_type = UBIFS_COMPR_ZLIB,
.comp_mutex = &deflate_mutex,
.decomp_mutex = &inflate_mutex,
.name = "zlib",
.capi_name = "deflate",
};
#else
static struct ubifs_compressor zlib_compr = {
.compr_type = UBIFS_COMPR_ZLIB,
.name = "zlib",
};
#endif
/* All UBIFS compressors */
struct ubifs_compressor *ubifs_compressors[UBIFS_COMPR_TYPES_CNT];
/**
* ubifs_compress - compress data.
* @in_buf: data to compress
* @in_len: length of the data to compress
* @out_buf: output buffer where compressed data should be stored
* @out_len: output buffer length is returned here
* @compr_type: type of compression to use on enter, actually used compression
* type on exit
*
* This function compresses input buffer @in_buf of length @in_len and stores
* the result in the output buffer @out_buf and the resulting length in
* @out_len. If the input buffer does not compress, it is just copied to the
* @out_buf. The same happens if @compr_type is %UBIFS_COMPR_NONE or if
* compression error occurred.
*
* Note, if the input buffer was not compressed, it is copied to the output
* buffer and %UBIFS_COMPR_NONE is returned in @compr_type.
*
* This functions returns %0 on success or a negative error code on failure.
*/
void ubifs_compress(const void *in_buf, int in_len, void *out_buf, int *out_len,
int *compr_type)
{
int err;
struct ubifs_compressor *compr = ubifs_compressors[*compr_type];
if (*compr_type == UBIFS_COMPR_NONE)
goto no_compr;
/* If the input data is small, do not even try to compress it */
if (in_len < UBIFS_MIN_COMPR_LEN)
goto no_compr;
if (compr->comp_mutex)
mutex_lock(compr->comp_mutex);
err = crypto_comp_compress(compr->cc, in_buf, in_len, out_buf,
out_len);
if (compr->comp_mutex)
mutex_unlock(compr->comp_mutex);
if (unlikely(err)) {
ubifs_warn("cannot compress %d bytes, compressor %s, "
"error %d, leave data uncompressed",
in_len, compr->name, err);
goto no_compr;
}
/*
* Presently, we just require that compression results in less data,
* rather than any defined minimum compression ratio or amount.
*/
if (ALIGN(*out_len, 8) >= ALIGN(in_len, 8))
goto no_compr;
return;
no_compr:
memcpy(out_buf, in_buf, in_len);
*out_len = in_len;
*compr_type = UBIFS_COMPR_NONE;
}
/**
* ubifs_decompress - decompress data.
* @in_buf: data to decompress
* @in_len: length of the data to decompress
* @out_buf: output buffer where decompressed data should
* @out_len: output length is returned here
* @compr_type: type of compression
*
* This function decompresses data from buffer @in_buf into buffer @out_buf.
* The length of the uncompressed data is returned in @out_len. This functions
* returns %0 on success or a negative error code on failure.
*/
int ubifs_decompress(const void *in_buf, int in_len, void *out_buf,
int *out_len, int compr_type)
{
int err;
struct ubifs_compressor *compr;
if (unlikely(compr_type < 0 || compr_type >= UBIFS_COMPR_TYPES_CNT)) {
ubifs_err("invalid compression type %d", compr_type);
return -EINVAL;
}
compr = ubifs_compressors[compr_type];
if (unlikely(!compr->capi_name)) {
ubifs_err("%s compression is not compiled in", compr->name);
return -EINVAL;
}
if (compr_type == UBIFS_COMPR_NONE) {
memcpy(out_buf, in_buf, in_len);
*out_len = in_len;
return 0;
}
if (compr->decomp_mutex)
mutex_lock(compr->decomp_mutex);
err = crypto_comp_decompress(compr->cc, in_buf, in_len, out_buf,
out_len);
if (compr->decomp_mutex)
mutex_unlock(compr->decomp_mutex);
if (err)
ubifs_err("cannot decompress %d bytes, compressor %s, "
"error %d", in_len, compr->name, err);
return err;
}
/**
* compr_init - initialize a compressor.
* @compr: compressor description object
*
* This function initializes the requested compressor and returns zero in case
* of success or a negative error code in case of failure.
*/
static int __init compr_init(struct ubifs_compressor *compr)
{
if (compr->capi_name) {
compr->cc = crypto_alloc_comp(compr->capi_name, 0, 0);
if (IS_ERR(compr->cc)) {
ubifs_err("cannot initialize compressor %s, error %ld",
compr->name, PTR_ERR(compr->cc));
return PTR_ERR(compr->cc);
}
}
ubifs_compressors[compr->compr_type] = compr;
return 0;
}
/**
* compr_exit - de-initialize a compressor.
* @compr: compressor description object
*/
static void compr_exit(struct ubifs_compressor *compr)
{
if (compr->capi_name)
crypto_free_comp(compr->cc);
return;
}
/**
* ubifs_compressors_init - initialize UBIFS compressors.
*
* This function initializes the compressor which were compiled in. Returns
* zero in case of success and a negative error code in case of failure.
*/
int __init ubifs_compressors_init(void)
{
int err;
err = compr_init(&lzo_compr);
if (err)
return err;
err = compr_init(&zlib_compr);
if (err)
goto out_lzo;
ubifs_compressors[UBIFS_COMPR_NONE] = &none_compr;
return 0;
out_lzo:
compr_exit(&lzo_compr);
return err;
}
/**
* ubifs_compressors_exit - de-initialize UBIFS compressors.
*/
void __exit ubifs_compressors_exit(void)
{
compr_exit(&lzo_compr);
compr_exit(&zlib_compr);
}
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/*
* This file is part of UBIFS.
*
* Copyright (C) 2006-2008 Nokia Corporation.
* Copyright (C) 2006, 2007 University of Szeged, Hungary
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* 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
*
* Authors: Zoltan Sogor
* Artem Bityutskiy (Битюцкий Артём)
* Adrian Hunter
*/
/* This file implements EXT2-compatible extended attribute ioctl() calls */
#include <linux/compat.h>
#include <linux/smp_lock.h>
#include <linux/mount.h>
#include "ubifs.h"
/**
* ubifs_set_inode_flags - set VFS inode flags.
* @inode: VFS inode to set flags for
*
* This function propagates flags from UBIFS inode object to VFS inode object.
*/
void ubifs_set_inode_flags(struct inode *inode)
{
unsigned int flags = ubifs_inode(inode)->flags;
inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC);
if (flags & UBIFS_SYNC_FL)
inode->i_flags |= S_SYNC;
if (flags & UBIFS_APPEND_FL)
inode->i_flags |= S_APPEND;
if (flags & UBIFS_IMMUTABLE_FL)
inode->i_flags |= S_IMMUTABLE;
if (flags & UBIFS_DIRSYNC_FL)
inode->i_flags |= S_DIRSYNC;
}
/*
* ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags.
* @ioctl_flags: flags to convert
*
* This function convert ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags
* (@UBIFS_COMPR_FL, etc).
*/
static int ioctl2ubifs(int ioctl_flags)
{
int ubifs_flags = 0;
if (ioctl_flags & FS_COMPR_FL)
ubifs_flags |= UBIFS_COMPR_FL;
if (ioctl_flags & FS_SYNC_FL)
ubifs_flags |= UBIFS_SYNC_FL;
if (ioctl_flags & FS_APPEND_FL)
ubifs_flags |= UBIFS_APPEND_FL;
if (ioctl_flags & FS_IMMUTABLE_FL)
ubifs_flags |= UBIFS_IMMUTABLE_FL;
if (ioctl_flags & FS_DIRSYNC_FL)
ubifs_flags |= UBIFS_DIRSYNC_FL;
return ubifs_flags;
}
/*
* ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags.
* @ubifs_flags: flags to convert
*
* This function convert UBIFS (@UBIFS_COMPR_FL, etc) to ioctl flags
* (@FS_COMPR_FL, etc).
*/
static int ubifs2ioctl(int ubifs_flags)
{
int ioctl_flags = 0;
if (ubifs_flags & UBIFS_COMPR_FL)
ioctl_flags |= FS_COMPR_FL;
if (ubifs_flags & UBIFS_SYNC_FL)
ioctl_flags |= FS_SYNC_FL;
if (ubifs_flags & UBIFS_APPEND_FL)
ioctl_flags |= FS_APPEND_FL;
if (ubifs_flags & UBIFS_IMMUTABLE_FL)
ioctl_flags |= FS_IMMUTABLE_FL;
if (ubifs_flags & UBIFS_DIRSYNC_FL)
ioctl_flags |= FS_DIRSYNC_FL;
return ioctl_flags;
}
static int setflags(struct inode *inode, int flags)
{
int oldflags, err, release;
struct ubifs_inode *ui = ubifs_inode(inode);
struct ubifs_info *c = inode->i_sb->s_fs_info;
struct ubifs_budget_req req = { .dirtied_ino = 1,
.dirtied_ino_d = ui->data_len };
err = ubifs_budget_space(c, &req);
if (err)
return err;
/*
* The IMMUTABLE and APPEND_ONLY flags can only be changed by
* the relevant capability.
*/
mutex_lock(&ui->ui_mutex);
oldflags = ubifs2ioctl(ui->flags);
if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
if (!capable(CAP_LINUX_IMMUTABLE)) {
err = -EPERM;
goto out_unlock;
}
}
ui->flags = ioctl2ubifs(flags);
ubifs_set_inode_flags(inode);
inode->i_ctime = ubifs_current_time(inode);
release = ui->dirty;
mark_inode_dirty_sync(inode);
mutex_unlock(&ui->ui_mutex);
if (release)
ubifs_release_budget(c, &req);
if (IS_SYNC(inode))
err = write_inode_now(inode, 1);
return err;
out_unlock:
ubifs_err("can't modify inode %lu attributes", inode->i_ino);
mutex_unlock(&ui->ui_mutex);
ubifs_release_budget(c, &req);
return err;
}
long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
int flags, err;
struct inode *inode = file->f_path.dentry->d_inode;
switch (cmd) {
case FS_IOC_GETFLAGS:
flags = ubifs2ioctl(ubifs_inode(inode)->flags);
return put_user(flags, (int __user *) arg);
case FS_IOC_SETFLAGS: {
if (IS_RDONLY(inode))
return -EROFS;
if (!is_owner_or_cap(inode))
return -EACCES;
if (get_user(flags, (int __user *) arg))
return -EFAULT;
if (!S_ISDIR(inode->i_mode))
flags &= ~FS_DIRSYNC_FL;
/*
* Make sure the file-system is read-write and make sure it
* will not become read-only while we are changing the flags.
*/
err = mnt_want_write(file->f_path.mnt);
if (err)
return err;
err = setflags(inode, flags);
mnt_drop_write(file->f_path.mnt);
return err;
}
default:
return -ENOTTY;
}
}
#ifdef CONFIG_COMPAT
long ubifs_compat_ioctl(struct file *file, 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;
default:
return -ENOIOCTLCMD;
}
return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
}
#endif
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