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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [qnx4/] [inode.c] - Blame information for rev 1765

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/*
 * QNX4 file system, Linux implementation.
 *
 * Version : 0.2.1
 *
 * Using parts of the xiafs filesystem.
 *
 * History :
 *
 * 01-06-1998 by Richard Frowijn : first release.
 * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
 * 30-06-1998 by Frank Denis : first step to write inodes.
 */
 
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/qnx4_fs.h>
#include <linux/fs.h>
#include <linux/locks.h>
#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/smp_lock.h>
 
#include <asm/uaccess.h>
 
#define QNX4_VERSION  4
#define QNX4_BMNAME   ".bitmap"
 
static struct super_operations qnx4_sops;
 
#ifdef CONFIG_QNX4FS_RW
 
int qnx4_sync_inode(struct inode *inode)
{
        int err = 0;
# if 0
        struct buffer_head *bh;
 
        bh = qnx4_update_inode(inode);
        if (bh && buffer_dirty(bh))
        {
                ll_rw_block(WRITE, 1, &bh);
                wait_on_buffer(bh);
                if (buffer_req(bh) && !buffer_uptodate(bh))
                {
                        printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
                                kdevname(inode->i_dev), inode->i_ino);
                        err = -1;
                }
                brelse (bh);
        } else if (!bh) {
                err = -1;
        }
# endif
 
        return err;
}
 
static void qnx4_delete_inode(struct inode *inode)
{
        QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
        lock_kernel();
        inode->i_size = 0;
        qnx4_truncate(inode);
        qnx4_free_inode(inode);
        unlock_kernel();
}
 
static void qnx4_write_super(struct super_block *sb)
{
        QNX4DEBUG(("qnx4: write_super\n"));
        sb->s_dirt = 0;
}
 
static void qnx4_write_inode(struct inode *inode, int unused)
{
        struct qnx4_inode_entry *raw_inode;
        int block, ino;
        struct buffer_head *bh;
        ino = inode->i_ino;
 
        QNX4DEBUG(("qnx4: write inode 1.\n"));
        if (inode->i_nlink == 0) {
                return;
        }
        if (!ino) {
                printk("qnx4: bad inode number on dev %s: %d is out of range\n",
                       kdevname(inode->i_dev), ino);
                return;
        }
        QNX4DEBUG(("qnx4: write inode 2.\n"));
        block = ino / QNX4_INODES_PER_BLOCK;
        lock_kernel();
        if (!(bh = sb_bread(inode->i_sb, block))) {
                printk("qnx4: major problem: unable to read inode from dev "
                       "%s\n", kdevname(inode->i_dev));
                unlock_kernel();
                return;
        }
        raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
            (ino % QNX4_INODES_PER_BLOCK);
        raw_inode->di_mode  = cpu_to_le16(inode->i_mode);
        raw_inode->di_uid   = cpu_to_le16(fs_high2lowuid(inode->i_uid));
        raw_inode->di_gid   = cpu_to_le16(fs_high2lowgid(inode->i_gid));
        raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
        raw_inode->di_size  = cpu_to_le32(inode->i_size);
        raw_inode->di_mtime = cpu_to_le32(inode->i_mtime);
        raw_inode->di_atime = cpu_to_le32(inode->i_atime);
        raw_inode->di_ctime = cpu_to_le32(inode->i_ctime);
        raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
        mark_buffer_dirty(bh);
        brelse(bh);
        unlock_kernel();
}
 
#endif
 
static struct super_block *qnx4_read_super(struct super_block *, void *, int);
static void qnx4_put_super(struct super_block *sb);
static void qnx4_read_inode(struct inode *);
static int qnx4_remount(struct super_block *sb, int *flags, char *data);
static int qnx4_statfs(struct super_block *, struct statfs *);
 
static struct super_operations qnx4_sops =
{
        read_inode:     qnx4_read_inode,
#ifdef CONFIG_QNX4FS_RW
        write_inode:    qnx4_write_inode,
        delete_inode:   qnx4_delete_inode,
#endif
        put_super:      qnx4_put_super,
#ifdef CONFIG_QNX4FS_RW
        write_super:    qnx4_write_super,
#endif
        statfs:         qnx4_statfs,
        remount_fs:     qnx4_remount,
};
 
static int qnx4_remount(struct super_block *sb, int *flags, char *data)
{
        struct qnx4_sb_info *qs;
 
        qs = &sb->u.qnx4_sb;
        qs->Version = QNX4_VERSION;
        if (*flags & MS_RDONLY) {
                return 0;
        }
        mark_buffer_dirty(qs->sb_buf);
 
        return 0;
}
 
struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
                                 int create)
{
        struct buffer_head *result = NULL;
 
        if ( nr >= 0 )
                nr = qnx4_block_map( inode, nr );
        if (nr) {
                result = sb_getblk(inode->i_sb, nr);
                return result;
        }
        if (!create) {
                return NULL;
        }
#if 0
        tmp = qnx4_new_block(inode->i_sb);
        if (!tmp) {
                return NULL;
        }
        result = sb_getblk(inode->i_sb, tmp);
        if (tst) {
                qnx4_free_block(inode->i_sb, tmp);
                brelse(result);
                goto repeat;
        }
        tst = tmp;
#endif
        inode->i_ctime = CURRENT_TIME;
        mark_inode_dirty(inode);
        return result;
}
 
struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
{
        struct buffer_head *bh;
 
        bh = qnx4_getblk(inode, block, create);
        if (!bh || buffer_uptodate(bh)) {
                return bh;
        }
        ll_rw_block(READ, 1, &bh);
        wait_on_buffer(bh);
        if (buffer_uptodate(bh)) {
                return bh;
        }
        brelse(bh);
 
        return NULL;
}
 
int qnx4_get_block( struct inode *inode, long iblock, struct buffer_head *bh, int create )
{
        unsigned long phys;
 
        QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
 
        phys = qnx4_block_map( inode, iblock );
        if ( phys ) {
                // logical block is before EOF
                bh->b_dev     = inode->i_dev;
                bh->b_blocknr = phys;
                bh->b_state  |= (1UL << BH_Mapped);
        } else if ( create ) {
                // to be done.
        }
        return 0;
}
 
unsigned long qnx4_block_map( struct inode *inode, long iblock )
{
        int ix;
        long offset, i_xblk;
        unsigned long block = 0;
        struct buffer_head *bh = 0;
        struct qnx4_xblk *xblk = 0;
        struct qnx4_inode_info *qnx4_inode = &inode->u.qnx4_i;
        qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->i_num_xtnts);
 
        if ( iblock < le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size) ) {
                // iblock is in the first extent. This is easy.
                block = le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_blk) + iblock - 1;
        } else {
                // iblock is beyond first extent. We have to follow the extent chain.
                i_xblk = le32_to_cpu(qnx4_inode->i_xblk);
                offset = iblock - le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size);
                ix = 0;
                while ( --nxtnt > 0 ) {
                        if ( ix == 0 ) {
                                // read next xtnt block.
                                bh = sb_bread(inode->i_sb, i_xblk - 1);
                                if ( !bh ) {
                                        QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
                                        return -EIO;
                                }
                                xblk = (struct qnx4_xblk*)bh->b_data;
                                if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
                                        QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
                                        return -EIO;
                                }
                        }
                        if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
                                // got it!
                                block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
                                break;
                        }
                        offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
                        if ( ++ix >= xblk->xblk_num_xtnts ) {
                                i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
                                ix = 0;
                                brelse( bh );
                                bh = 0;
                        }
                }
                if ( bh )
                        brelse( bh );
        }
 
        QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
        return block;
}
 
static int qnx4_statfs(struct super_block *sb, struct statfs *buf)
{
        buf->f_type    = sb->s_magic;
        buf->f_bsize   = sb->s_blocksize;
        buf->f_blocks  = le32_to_cpu(sb->u.qnx4_sb.BitMap->di_size) * 8;
        buf->f_bfree   = qnx4_count_free_blocks(sb);
        buf->f_bavail  = buf->f_bfree;
        buf->f_namelen = QNX4_NAME_MAX;
 
        return 0;
}
 
/*
 * Check the root directory of the filesystem to make sure
 * it really _is_ a qnx4 filesystem, and to check the size
 * of the directory entry.
 */
static const char *qnx4_checkroot(struct super_block *sb)
{
        struct buffer_head *bh;
        struct qnx4_inode_entry *rootdir;
        int rd, rl;
        int i, j;
        int found = 0;
 
        if (*(sb->u.qnx4_sb.sb->RootDir.di_fname) != '/') {
                return "no qnx4 filesystem (no root dir).";
        } else {
                QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", kdevname(sb->s_dev)));
                rd = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
                rl = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_size);
                for (j = 0; j < rl; j++) {
                        bh = sb_bread(sb, rd + j);      /* root dir, first block */
                        if (bh == NULL) {
                                return "unable to read root entry.";
                        }
                        for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
                                rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
                                if (rootdir->di_fname != NULL) {
                                        QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
                                        if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
                                                found = 1;
                                                sb->u.qnx4_sb.BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
                                                if (!sb->u.qnx4_sb.BitMap) {
                                                        brelse (bh);
                                                        return "not enough memory for bitmap inode";
                                                }
                                                memcpy( sb->u.qnx4_sb.BitMap, rootdir, sizeof( struct qnx4_inode_entry ) );     /* keep bitmap inode known */
                                                break;
                                        }
                                }
                        }
                        brelse(bh);
                        if (found != 0) {
                                break;
                        }
                }
                if (found == 0) {
                        return "bitmap file not found.";
                }
        }
        return NULL;
}
 
static struct super_block *qnx4_read_super(struct super_block *s,
                                           void *data, int silent)
{
        struct buffer_head *bh;
        kdev_t dev = s->s_dev;
        struct inode *root;
        const char *errmsg;
 
        set_blocksize(dev, QNX4_BLOCK_SIZE);
        s->s_blocksize = QNX4_BLOCK_SIZE;
        s->s_blocksize_bits = QNX4_BLOCK_SIZE_BITS;
 
        /* Check the superblock signature. Since the qnx4 code is
           dangerous, we should leave as quickly as possible
           if we don't belong here... */
        bh = sb_bread(s, 1);
        if (!bh) {
                printk("qnx4: unable to read the superblock\n");
                goto outnobh;
        }
        if ( le32_to_cpu( *(__u32*)bh->b_data ) != QNX4_SUPER_MAGIC ) {
                if (!silent)
                        printk("qnx4: wrong fsid in superblock sector.\n");
                goto out;
        }
        s->s_op = &qnx4_sops;
        s->s_magic = QNX4_SUPER_MAGIC;
#ifndef CONFIG_QNX4FS_RW
        s->s_flags |= MS_RDONLY;        /* Yup, read-only yet */
#endif
        s->u.qnx4_sb.sb_buf = bh;
        s->u.qnx4_sb.sb = (struct qnx4_super_block *) bh->b_data;
 
 
        /* check before allocating dentries, inodes, .. */
        errmsg = qnx4_checkroot(s);
        if (errmsg != NULL) {
                if (!silent)
                        printk("qnx4: %s\n", errmsg);
                goto out;
        }
 
        /* does root not have inode number QNX4_ROOT_INO ?? */
        root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
        if (!root) {
                printk("qnx4: get inode failed\n");
                goto out;
        }
 
        s->s_root = d_alloc_root(root);
        if (s->s_root == NULL)
                goto outi;
 
        brelse(bh);
 
        return s;
 
      outi:
        iput(root);
      out:
        brelse(bh);
      outnobh:
 
        return NULL;
}
 
static void qnx4_put_super(struct super_block *sb)
{
        kfree( sb->u.qnx4_sb.BitMap );
        return;
}
 
static int qnx4_writepage(struct page *page)
{
        return block_write_full_page(page,qnx4_get_block);
}
static int qnx4_readpage(struct file *file, struct page *page)
{
        return block_read_full_page(page,qnx4_get_block);
}
static int qnx4_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
{
        return cont_prepare_write(page,from,to,qnx4_get_block,
                &page->mapping->host->u.qnx4_i.mmu_private);
}
static int qnx4_bmap(struct address_space *mapping, long block)
{
        return generic_block_bmap(mapping,block,qnx4_get_block);
}
struct address_space_operations qnx4_aops = {
        readpage: qnx4_readpage,
        writepage: qnx4_writepage,
        sync_page: block_sync_page,
        prepare_write: qnx4_prepare_write,
        commit_write: generic_commit_write,
        bmap: qnx4_bmap
};
 
static void qnx4_read_inode(struct inode *inode)
{
        struct buffer_head *bh;
        struct qnx4_inode_entry *raw_inode;
        int block, ino;
 
        ino = inode->i_ino;
        inode->i_mode = 0;
 
        QNX4DEBUG(("Reading inode : [%d]\n", ino));
        if (!ino) {
                printk("qnx4: bad inode number on dev %s: %d is out of range\n",
                       kdevname(inode->i_dev), ino);
                return;
        }
        block = ino / QNX4_INODES_PER_BLOCK;
 
        if (!(bh = sb_bread(inode->i_sb, block))) {
                printk("qnx4: major problem: unable to read inode from dev "
                       "%s\n", kdevname(inode->i_dev));
                return;
        }
        raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
            (ino % QNX4_INODES_PER_BLOCK);
 
        inode->i_mode    = le16_to_cpu(raw_inode->di_mode);
        inode->i_uid     = (uid_t)le16_to_cpu(raw_inode->di_uid);
        inode->i_gid     = (gid_t)le16_to_cpu(raw_inode->di_gid);
        inode->i_nlink   = le16_to_cpu(raw_inode->di_nlink);
        inode->i_size    = le32_to_cpu(raw_inode->di_size);
        inode->i_mtime   = le32_to_cpu(raw_inode->di_mtime);
        inode->i_atime   = le32_to_cpu(raw_inode->di_atime);
        inode->i_ctime   = le32_to_cpu(raw_inode->di_ctime);
        inode->i_blocks  = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
        inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
 
        memcpy(&inode->u.qnx4_i, (struct qnx4_inode_info *) raw_inode, QNX4_DIR_ENTRY_SIZE);
        if (S_ISREG(inode->i_mode)) {
                inode->i_op = &qnx4_file_inode_operations;
                inode->i_fop = &qnx4_file_operations;
                inode->i_mapping->a_ops = &qnx4_aops;
                inode->u.qnx4_i.mmu_private = inode->i_size;
        } else if (S_ISDIR(inode->i_mode)) {
                inode->i_op = &qnx4_dir_inode_operations;
                inode->i_fop = &qnx4_dir_operations;
        } else if (S_ISLNK(inode->i_mode)) {
                inode->i_op = &page_symlink_inode_operations;
                inode->i_mapping->a_ops = &qnx4_aops;
                inode->u.qnx4_i.mmu_private = inode->i_size;
        } else
                printk("qnx4: bad inode %d on dev %s\n",ino,kdevname(inode->i_dev));
        brelse(bh);
}
 
static DECLARE_FSTYPE_DEV(qnx4_fs_type, "qnx4", qnx4_read_super);
 
static int __init init_qnx4_fs(void)
{
        printk("QNX4 filesystem 0.2.2 registered.\n");
        return register_filesystem(&qnx4_fs_type);
}
 
static void __exit exit_qnx4_fs(void)
{
        unregister_filesystem(&qnx4_fs_type);
}
 
EXPORT_NO_SYMBOLS;
 
module_init(init_qnx4_fs)
module_exit(exit_qnx4_fs)
MODULE_LICENSE("GPL");
 

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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [qnx4/] [inode.c] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* QNX4 file system, Linux implementation.`
3			`*`
4			`* Version : 0.2.1`
5			`*`
6			`* Using parts of the xiafs filesystem.`
7			`*`
8			`* History :`
9			`*`
10			`* 01-06-1998 by Richard Frowijn : first release.`
11			`* 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.`
12			`* 30-06-1998 by Frank Denis : first step to write inodes.`
13			`*/`
14
15			`#include <linux/config.h>`
16			`#include <linux/module.h>`
17			`#include <linux/types.h>`
18			`#include <linux/string.h>`
19			`#include <linux/errno.h>`
20			`#include <linux/slab.h>`
21			`#include <linux/qnx4_fs.h>`
22			`#include <linux/fs.h>`
23			`#include <linux/locks.h>`
24			`#include <linux/init.h>`
25			`#include <linux/highuid.h>`
26			`#include <linux/smp_lock.h>`
27
28			`#include <asm/uaccess.h>`
29
30			`#define QNX4_VERSION 4`
31			`#define QNX4_BMNAME ".bitmap"`
32
33			`static struct super_operations qnx4_sops;`
34
35			`#ifdef CONFIG_QNX4FS_RW`
36
37			`int qnx4_sync_inode(struct inode *inode)`
38			`{`
39			`int err = 0;`
40			`# if 0`
41			`struct buffer_head *bh;`
42
43			`bh = qnx4_update_inode(inode);`
44			`if (bh && buffer_dirty(bh))`
45			`{`
46			`ll_rw_block(WRITE, 1, &bh);`
47			`wait_on_buffer(bh);`
48			`if (buffer_req(bh) && !buffer_uptodate(bh))`
49			`{`
50			`printk ("IO error syncing qnx4 inode [%s:%08lx]\n",`
51			`kdevname(inode->i_dev), inode->i_ino);`
52			`err = -1;`
53			`}`
54			`brelse (bh);`
55			`} else if (!bh) {`
56			`err = -1;`
57			`}`
58			`# endif`
59
60			`return err;`
61			`}`
62
63			`static void qnx4_delete_inode(struct inode *inode)`
64			`{`
65			`QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));`
66			`lock_kernel();`
67			`inode->i_size = 0;`
68			`qnx4_truncate(inode);`
69			`qnx4_free_inode(inode);`
70			`unlock_kernel();`
71			`}`
72
73			`static void qnx4_write_super(struct super_block *sb)`
74			`{`
75			`QNX4DEBUG(("qnx4: write_super\n"));`
76			`sb->s_dirt = 0;`
77			`}`
78
79			`static void qnx4_write_inode(struct inode *inode, int unused)`
80			`{`
81			`struct qnx4_inode_entry *raw_inode;`
82			`int block, ino;`
83			`struct buffer_head *bh;`
84			`ino = inode->i_ino;`
85
86			`QNX4DEBUG(("qnx4: write inode 1.\n"));`
87			`if (inode->i_nlink == 0) {`
88			`return;`
89			`}`
90			`if (!ino) {`
91			`printk("qnx4: bad inode number on dev %s: %d is out of range\n",`
92			`kdevname(inode->i_dev), ino);`
93			`return;`
94			`}`
95			`QNX4DEBUG(("qnx4: write inode 2.\n"));`
96			`block = ino / QNX4_INODES_PER_BLOCK;`
97			`lock_kernel();`
98			`if (!(bh = sb_bread(inode->i_sb, block))) {`
99			`printk("qnx4: major problem: unable to read inode from dev "`
100			`"%s\n", kdevname(inode->i_dev));`
101			`unlock_kernel();`
102			`return;`
103			`}`
104			`raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +`
105			`(ino % QNX4_INODES_PER_BLOCK);`
106			`raw_inode->di_mode = cpu_to_le16(inode->i_mode);`
107			`raw_inode->di_uid = cpu_to_le16(fs_high2lowuid(inode->i_uid));`
108			`raw_inode->di_gid = cpu_to_le16(fs_high2lowgid(inode->i_gid));`
109			`raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);`
110			`raw_inode->di_size = cpu_to_le32(inode->i_size);`
111			`raw_inode->di_mtime = cpu_to_le32(inode->i_mtime);`
112			`raw_inode->di_atime = cpu_to_le32(inode->i_atime);`
113			`raw_inode->di_ctime = cpu_to_le32(inode->i_ctime);`
114			`raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);`
115			`mark_buffer_dirty(bh);`
116			`brelse(bh);`
117			`unlock_kernel();`
118			`}`
119
120			`#endif`
121
122			`static struct super_block qnx4_read_super(struct super_block , void *, int);`
123			`static void qnx4_put_super(struct super_block *sb);`
124			`static void qnx4_read_inode(struct inode *);`
125			`static int qnx4_remount(struct super_block sb, int flags, char *data);`
126			`static int qnx4_statfs(struct super_block , struct statfs );`
127
128			`static struct super_operations qnx4_sops =`
129			`{`
130			`read_inode: qnx4_read_inode,`
131			`#ifdef CONFIG_QNX4FS_RW`
132			`write_inode: qnx4_write_inode,`
133			`delete_inode: qnx4_delete_inode,`
134			`#endif`
135			`put_super: qnx4_put_super,`
136			`#ifdef CONFIG_QNX4FS_RW`
137			`write_super: qnx4_write_super,`
138			`#endif`
139			`statfs: qnx4_statfs,`
140			`remount_fs: qnx4_remount,`
141			`};`
142
143			`static int qnx4_remount(struct super_block sb, int flags, char *data)`
144			`{`
145			`struct qnx4_sb_info *qs;`
146
147			`qs = &sb->u.qnx4_sb;`
148			`qs->Version = QNX4_VERSION;`
149			`if (*flags & MS_RDONLY) {`
150			`return 0;`
151			`}`
152			`mark_buffer_dirty(qs->sb_buf);`
153
154			`return 0;`
155			`}`
156
157			`struct buffer_head qnx4_getblk(struct inode inode, int nr,`
158			`int create)`
159			`{`
160			`struct buffer_head *result = NULL;`
161
162			`if ( nr >= 0 )`
163			`nr = qnx4_block_map( inode, nr );`
164			`if (nr) {`
165			`result = sb_getblk(inode->i_sb, nr);`
166			`return result;`
167			`}`
168			`if (!create) {`
169			`return NULL;`
170			`}`
171			`#if 0`
172			`tmp = qnx4_new_block(inode->i_sb);`
173			`if (!tmp) {`
174			`return NULL;`
175			`}`
176			`result = sb_getblk(inode->i_sb, tmp);`
177			`if (tst) {`
178			`qnx4_free_block(inode->i_sb, tmp);`
179			`brelse(result);`
180			`goto repeat;`
181			`}`
182			`tst = tmp;`
183			`#endif`
184			`inode->i_ctime = CURRENT_TIME;`
185			`mark_inode_dirty(inode);`
186			`return result;`
187			`}`
188
189			`struct buffer_head qnx4_bread(struct inode inode, int block, int create)`
190			`{`
191			`struct buffer_head *bh;`
192
193			`bh = qnx4_getblk(inode, block, create);`
194			`if (!bh \|\| buffer_uptodate(bh)) {`
195			`return bh;`
196			`}`
197			`ll_rw_block(READ, 1, &bh);`
198			`wait_on_buffer(bh);`
199			`if (buffer_uptodate(bh)) {`
200			`return bh;`
201			`}`
202			`brelse(bh);`
203
204			`return NULL;`
205			`}`
206
207			`int qnx4_get_block( struct inode inode, long iblock, struct buffer_head bh, int create )`
208			`{`
209			`unsigned long phys;`
210
211			`QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));`
212
213			`phys = qnx4_block_map( inode, iblock );`
214			`if ( phys ) {`
215			`// logical block is before EOF`
216			`bh->b_dev = inode->i_dev;`
217			`bh->b_blocknr = phys;`
218			`bh->b_state \|= (1UL << BH_Mapped);`
219			`} else if ( create ) {`
220			`// to be done.`
221			`}`
222			`return 0;`
223			`}`
224
225			`unsigned long qnx4_block_map( struct inode *inode, long iblock )`
226			`{`
227			`int ix;`
228			`long offset, i_xblk;`
229			`unsigned long block = 0;`
230			`struct buffer_head *bh = 0;`
231			`struct qnx4_xblk *xblk = 0;`
232			`struct qnx4_inode_info *qnx4_inode = &inode->u.qnx4_i;`
233			`qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->i_num_xtnts);`
234
235			`if ( iblock < le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size) ) {`
236			`// iblock is in the first extent. This is easy.`
237			`block = le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_blk) + iblock - 1;`
238			`} else {`
239			`// iblock is beyond first extent. We have to follow the extent chain.`
240			`i_xblk = le32_to_cpu(qnx4_inode->i_xblk);`
241			`offset = iblock - le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size);`
242			`ix = 0;`
243			`while ( --nxtnt > 0 ) {`
244			`if ( ix == 0 ) {`
245			`// read next xtnt block.`
246			`bh = sb_bread(inode->i_sb, i_xblk - 1);`
247			`if ( !bh ) {`
248			`QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));`
249			`return -EIO;`
250			`}`
251			`xblk = (struct qnx4_xblk*)bh->b_data;`
252			`if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {`
253			`QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));`
254			`return -EIO;`
255			`}`
256			`}`
257			`if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {`
258			`// got it!`
259			`block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;`
260			`break;`
261			`}`
262			`offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);`
263			`if ( ++ix >= xblk->xblk_num_xtnts ) {`
264			`i_xblk = le32_to_cpu(xblk->xblk_next_xblk);`
265			`ix = 0;`
266			`brelse( bh );`
267			`bh = 0;`
268			`}`
269			`}`
270			`if ( bh )`
271			`brelse( bh );`
272			`}`
273
274			`QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));`
275			`return block;`
276			`}`
277
278			`static int qnx4_statfs(struct super_block sb, struct statfs buf)`
279			`{`
280			`buf->f_type = sb->s_magic;`
281			`buf->f_bsize = sb->s_blocksize;`
282			`buf->f_blocks = le32_to_cpu(sb->u.qnx4_sb.BitMap->di_size) * 8;`
283			`buf->f_bfree = qnx4_count_free_blocks(sb);`
284			`buf->f_bavail = buf->f_bfree;`
285			`buf->f_namelen = QNX4_NAME_MAX;`
286
287			`return 0;`
288			`}`
289
290			`/*`
291			`* Check the root directory of the filesystem to make sure`
292			`* it really _is_ a qnx4 filesystem, and to check the size`
293			`* of the directory entry.`
294			`*/`
295			`static const char qnx4_checkroot(struct super_block sb)`
296			`{`
297			`struct buffer_head *bh;`
298			`struct qnx4_inode_entry *rootdir;`
299			`int rd, rl;`
300			`int i, j;`
301			`int found = 0;`
302
303			`if (*(sb->u.qnx4_sb.sb->RootDir.di_fname) != '/') {`
304			`return "no qnx4 filesystem (no root dir).";`
305			`} else {`
306			`QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", kdevname(sb->s_dev)));`
307			`rd = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_blk) - 1;`
308			`rl = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_size);`
309			`for (j = 0; j < rl; j++) {`
310			`bh = sb_bread(sb, rd + j); /* root dir, first block */`
311			`if (bh == NULL) {`
312			`return "unable to read root entry.";`
313			`}`
314			`for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {`
315			`rootdir = (struct qnx4_inode_entry ) (bh->b_data + i QNX4_DIR_ENTRY_SIZE);`
316			`if (rootdir->di_fname != NULL) {`
317			`QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));`
318			`if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {`
319			`found = 1;`
320			`sb->u.qnx4_sb.BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );`
321			`if (!sb->u.qnx4_sb.BitMap) {`
322			`brelse (bh);`
323			`return "not enough memory for bitmap inode";`
324			`}`
325			`memcpy( sb->u.qnx4_sb.BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */`
326			`break;`
327			`}`
328			`}`
329			`}`
330			`brelse(bh);`
331			`if (found != 0) {`
332			`break;`
333			`}`
334			`}`
335			`if (found == 0) {`
336			`return "bitmap file not found.";`
337			`}`
338			`}`
339			`return NULL;`
340			`}`
341
342			`static struct super_block qnx4_read_super(struct super_block s,`
343			`void *data, int silent)`
344			`{`
345			`struct buffer_head *bh;`
346			`kdev_t dev = s->s_dev;`
347			`struct inode *root;`
348			`const char *errmsg;`
349
350			`set_blocksize(dev, QNX4_BLOCK_SIZE);`
351			`s->s_blocksize = QNX4_BLOCK_SIZE;`
352			`s->s_blocksize_bits = QNX4_BLOCK_SIZE_BITS;`
353
354			`/* Check the superblock signature. Since the qnx4 code is`
355			`dangerous, we should leave as quickly as possible`
356			`if we don't belong here... */`
357			`bh = sb_bread(s, 1);`
358			`if (!bh) {`
359			`printk("qnx4: unable to read the superblock\n");`
360			`goto outnobh;`
361			`}`
362			`if ( le32_to_cpu( (__u32)bh->b_data ) != QNX4_SUPER_MAGIC ) {`
363			`if (!silent)`
364			`printk("qnx4: wrong fsid in superblock sector.\n");`
365			`goto out;`
366			`}`
367			`s->s_op = &qnx4_sops;`
368			`s->s_magic = QNX4_SUPER_MAGIC;`
369			`#ifndef CONFIG_QNX4FS_RW`
370			`s->s_flags \|= MS_RDONLY; /* Yup, read-only yet */`
371			`#endif`
372			`s->u.qnx4_sb.sb_buf = bh;`
373			`s->u.qnx4_sb.sb = (struct qnx4_super_block *) bh->b_data;`
374
375
376			`/* check before allocating dentries, inodes, .. */`
377			`errmsg = qnx4_checkroot(s);`
378			`if (errmsg != NULL) {`
379			`if (!silent)`
380			`printk("qnx4: %s\n", errmsg);`
381			`goto out;`
382			`}`
383
384			`/* does root not have inode number QNX4_ROOT_INO ?? */`
385			`root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);`
386			`if (!root) {`
387			`printk("qnx4: get inode failed\n");`
388			`goto out;`
389			`}`
390
391			`s->s_root = d_alloc_root(root);`
392			`if (s->s_root == NULL)`
393			`goto outi;`
394
395			`brelse(bh);`
396
397			`return s;`
398
399			`outi:`
400			`iput(root);`
401			`out:`
402			`brelse(bh);`
403			`outnobh:`
404
405			`return NULL;`
406			`}`
407
408			`static void qnx4_put_super(struct super_block *sb)`
409			`{`
410			`kfree( sb->u.qnx4_sb.BitMap );`
411			`return;`
412			`}`
413
414			`static int qnx4_writepage(struct page *page)`
415			`{`
416			`return block_write_full_page(page,qnx4_get_block);`
417			`}`
418			`static int qnx4_readpage(struct file file, struct page page)`
419			`{`
420			`return block_read_full_page(page,qnx4_get_block);`
421			`}`
422			`static int qnx4_prepare_write(struct file file, struct page page, unsigned from, unsigned to)`
423			`{`
424			`return cont_prepare_write(page,from,to,qnx4_get_block,`
425			`&page->mapping->host->u.qnx4_i.mmu_private);`
426			`}`
427			`static int qnx4_bmap(struct address_space *mapping, long block)`
428			`{`
429			`return generic_block_bmap(mapping,block,qnx4_get_block);`
430			`}`
431			`struct address_space_operations qnx4_aops = {`
432			`readpage: qnx4_readpage,`
433			`writepage: qnx4_writepage,`
434			`sync_page: block_sync_page,`
435			`prepare_write: qnx4_prepare_write,`
436			`commit_write: generic_commit_write,`
437			`bmap: qnx4_bmap`
438			`};`
439
440			`static void qnx4_read_inode(struct inode *inode)`
441			`{`
442			`struct buffer_head *bh;`
443			`struct qnx4_inode_entry *raw_inode;`
444			`int block, ino;`
445
446			`ino = inode->i_ino;`
447			`inode->i_mode = 0;`
448
449			`QNX4DEBUG(("Reading inode : [%d]\n", ino));`
450			`if (!ino) {`
451			`printk("qnx4: bad inode number on dev %s: %d is out of range\n",`
452			`kdevname(inode->i_dev), ino);`
453			`return;`
454			`}`
455			`block = ino / QNX4_INODES_PER_BLOCK;`
456
457			`if (!(bh = sb_bread(inode->i_sb, block))) {`
458			`printk("qnx4: major problem: unable to read inode from dev "`
459			`"%s\n", kdevname(inode->i_dev));`
460			`return;`
461			`}`
462			`raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +`
463			`(ino % QNX4_INODES_PER_BLOCK);`
464
465			`inode->i_mode = le16_to_cpu(raw_inode->di_mode);`
466			`inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);`
467			`inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);`
468			`inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);`
469			`inode->i_size = le32_to_cpu(raw_inode->di_size);`
470			`inode->i_mtime = le32_to_cpu(raw_inode->di_mtime);`
471			`inode->i_atime = le32_to_cpu(raw_inode->di_atime);`
472			`inode->i_ctime = le32_to_cpu(raw_inode->di_ctime);`
473			`inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);`
474			`inode->i_blksize = QNX4_DIR_ENTRY_SIZE;`
475
476			`memcpy(&inode->u.qnx4_i, (struct qnx4_inode_info *) raw_inode, QNX4_DIR_ENTRY_SIZE);`
477			`if (S_ISREG(inode->i_mode)) {`
478			`inode->i_op = &qnx4_file_inode_operations;`
479			`inode->i_fop = &qnx4_file_operations;`
480			`inode->i_mapping->a_ops = &qnx4_aops;`
481			`inode->u.qnx4_i.mmu_private = inode->i_size;`
482			`} else if (S_ISDIR(inode->i_mode)) {`
483			`inode->i_op = &qnx4_dir_inode_operations;`
484			`inode->i_fop = &qnx4_dir_operations;`
485			`} else if (S_ISLNK(inode->i_mode)) {`
486			`inode->i_op = &page_symlink_inode_operations;`
487			`inode->i_mapping->a_ops = &qnx4_aops;`
488			`inode->u.qnx4_i.mmu_private = inode->i_size;`
489			`} else`
490			`printk("qnx4: bad inode %d on dev %s\n",ino,kdevname(inode->i_dev));`
491			`brelse(bh);`
492			`}`
493
494			`static DECLARE_FSTYPE_DEV(qnx4_fs_type, "qnx4", qnx4_read_super);`
495
496			`static int __init init_qnx4_fs(void)`
497			`{`
498			`printk("QNX4 filesystem 0.2.2 registered.\n");`
499			`return register_filesystem(&qnx4_fs_type);`
500			`}`
501
502			`static void __exit exit_qnx4_fs(void)`
503			`{`
504			`unregister_filesystem(&qnx4_fs_type);`
505			`}`
506
507			`EXPORT_NO_SYMBOLS;`
508
509			`module_init(init_qnx4_fs)`
510			`module_exit(exit_qnx4_fs)`
511			`MODULE_LICENSE("GPL");`
512