linux-imx

/*

 * QNX6 file system, Linux implementation.

 *

 * Version : 1.0.0

 *

 * History :

 *

 * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.

 * 16-02-2012 pagemap extension by Al Viro

 *

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/highuid.h>

#include <linux/pagemap.h>

#include <linux/buffer_head.h>

#include <linux/writeback.h>

#include <linux/statfs.h>

#include <linux/parser.h>

#include <linux/seq_file.h>

#include <linux/mount.h>

#include <linux/crc32.h>

#include <linux/mpage.h>

#include "qnx6.h"

​

static const struct super_operations qnx6_sops;

​

static void qnx6_put_super(struct super_block *sb);

static struct inode *qnx6_alloc_inode(struct super_block *sb);

static void qnx6_destroy_inode(struct inode *inode);

static int qnx6_remount(struct super_block *sb, int *flags, char *data);

static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf);

static int qnx6_show_options(struct seq_file *seq, struct dentry *root);

​

static const struct super_operations qnx6_sops = {

    .alloc_inode    = qnx6_alloc_inode,

    .destroy_inode  = qnx6_destroy_inode,

    .put_super  = qnx6_put_super,

    .statfs     = qnx6_statfs,

    .remount_fs = qnx6_remount,

    .show_options   = qnx6_show_options,

};

​

static int qnx6_show_options(struct seq_file *seq, struct dentry *root)

{

    struct super_block *sb = root->d_sb;

    struct qnx6_sb_info *sbi = QNX6_SB(sb);

​

    if (sbi->s_mount_opt & QNX6_MOUNT_MMI_FS)

        seq_puts(seq, ",mmi_fs");

    return 0;

}

​

static int qnx6_remount(struct super_block *sb, int *flags, char *data)

{

    sync_filesystem(sb);

    *flags |= SB_RDONLY;

    return 0;

}

​

static unsigned qnx6_get_devblock(struct super_block *sb, __fs32 block)

{

    struct qnx6_sb_info *sbi = QNX6_SB(sb);

    return fs32_to_cpu(sbi, block) + sbi->s_blks_off;

}

​

static unsigned qnx6_block_map(struct inode *inode, unsigned iblock);

​

static int qnx6_get_block(struct inode *inode, sector_t iblock,

            struct buffer_head *bh, int create)

{

    unsigned phys;

​

    pr_debug("qnx6_get_block inode=[%ld] iblock=[%ld]\n",

         inode->i_ino, (unsigned long)iblock);

​

    phys = qnx6_block_map(inode, iblock);

    if (phys) {

        /* logical block is before EOF */

        map_bh(bh, inode->i_sb, phys);

    }

    return 0;

}

​

static int qnx6_check_blockptr(__fs32 ptr)

{

    if (ptr == ~(__fs32)0) {

        pr_err("hit unused blockpointer.\n");

        return 0;

    }