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linux-sg2042/fs/qnx4/inode.c

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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/fs.h>
#include <linux/qnx4_fs.h>
#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/smp_lock.h>
#include <linux/pagemap.h>
#include <linux/buffer_head.h>
#include <linux/vfs.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))
{
sync_dirty_buffer(bh);
if (buffer_req(bh) && !buffer_uptodate(bh))
{
printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
inode->i_sb->s_id, 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));
inode->i_size = 0;
qnx4_truncate(inode);
lock_kernel();
qnx4_free_inode(inode);
unlock_kernel();
}
static void qnx4_write_super(struct super_block *sb)
{
lock_kernel();
QNX4DEBUG(("qnx4: write_super\n"));
sb->s_dirt = 0;
unlock_kernel();
}
static int 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 0;
}
if (!ino) {
printk("qnx4: bad inode number on dev %s: %d is out of range\n",
inode->i_sb->s_id, ino);
return -EIO;
}
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", inode->i_sb->s_id);
unlock_kernel();
return -EIO;
}
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.tv_sec);
raw_inode->di_atime = cpu_to_le32(inode->i_atime.tv_sec);
raw_inode->di_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
mark_buffer_dirty(bh);
brelse(bh);
unlock_kernel();
return 0;
}
#endif
static void qnx4_put_super(struct super_block *sb);
static struct inode *qnx4_alloc_inode(struct super_block *sb);
static void qnx4_destroy_inode(struct inode *inode);
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 kstatfs *);
static struct super_operations qnx4_sops =
{
.alloc_inode = qnx4_alloc_inode,
.destroy_inode = qnx4_destroy_inode,
.read_inode = qnx4_read_inode,
.put_super = qnx4_put_super,
.statfs = qnx4_statfs,
.remount_fs = qnx4_remount,
#ifdef CONFIG_QNX4FS_RW
.write_inode = qnx4_write_inode,
.delete_inode = qnx4_delete_inode,
.write_super = qnx4_write_super,
#endif
};
static int qnx4_remount(struct super_block *sb, int *flags, char *data)
{
struct qnx4_sb_info *qs;
qs = qnx4_sb(sb);
qs->Version = QNX4_VERSION;
#ifndef CONFIG_QNX4FS_RW
*flags |= MS_RDONLY;
#endif
if (*flags & MS_RDONLY) {
return 0;
}
mark_buffer_dirty(qs->sb_buf);
return 0;
}
static 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_SEC;
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;
}
static int qnx4_get_block( struct inode *inode, sector_t 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
map_bh(bh, inode->i_sb, phys);
} 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 = NULL;
struct qnx4_xblk *xblk = NULL;
struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
// iblock is in the first extent. This is easy.
block = le32_to_cpu(qnx4_inode->di_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->di_xblk);
offset = iblock - le32_to_cpu(qnx4_inode->di_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 = NULL;
}
}
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 kstatfs *buf)
{
lock_kernel();
buf->f_type = sb->s_magic;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = le32_to_cpu(qnx4_sb(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;
unlock_kernel();
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 (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
return "no qnx4 filesystem (no root dir).";
} else {
QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", sb->s_id));
rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
rl = le32_to_cpu(qnx4_sb(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;
qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
if (!qnx4_sb(sb)->BitMap) {
brelse (bh);
return "not enough memory for bitmap inode";
}
memcpy( qnx4_sb(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 int qnx4_fill_super(struct super_block *s, void *data, int silent)
{
struct buffer_head *bh;
struct inode *root;
const char *errmsg;
struct qnx4_sb_info *qs;
qs = kmalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
if (!qs)
return -ENOMEM;
s->s_fs_info = qs;
memset(qs, 0, sizeof(struct qnx4_sb_info));
sb_set_blocksize(s, QNX4_BLOCK_SIZE);
/* 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.\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
qnx4_sb(s)->sb_buf = bh;
qnx4_sb(s)->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 0;
outi:
iput(root);
out:
brelse(bh);
outnobh:
kfree(qs);
s->s_fs_info = NULL;
return -EINVAL;
}
static void qnx4_put_super(struct super_block *sb)
{
struct qnx4_sb_info *qs = qnx4_sb(sb);
kfree( qs->BitMap );
kfree( qs );
sb->s_fs_info = NULL;
return;
}
static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
{
return block_write_full_page(page,qnx4_get_block, wbc);
}
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)
{
struct qnx4_inode_info *qnx4_inode = qnx4_i(page->mapping->host);
return cont_prepare_write(page, from, to, qnx4_get_block,
&qnx4_inode->mmu_private);
}
static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
{
return generic_block_bmap(mapping,block,qnx4_get_block);
}
static 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;
struct super_block *sb = inode->i_sb;
struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
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",
sb->s_id, ino);
return;
}
block = ino / QNX4_INODES_PER_BLOCK;
if (!(bh = sb_bread(sb, block))) {
printk("qnx4: major problem: unable to read inode from dev "
"%s\n", sb->s_id);
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.tv_sec = le32_to_cpu(raw_inode->di_mtime);
inode->i_mtime.tv_nsec = 0;
inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
inode->i_atime.tv_nsec = 0;
inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
inode->i_ctime.tv_nsec = 0;
inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
memcpy(qnx4_inode, 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;
qnx4_i(inode)->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;
qnx4_i(inode)->mmu_private = inode->i_size;
} else
printk("qnx4: bad inode %d on dev %s\n",ino,sb->s_id);
brelse(bh);
}
static kmem_cache_t *qnx4_inode_cachep;
static struct inode *qnx4_alloc_inode(struct super_block *sb)
{
struct qnx4_inode_info *ei;
ei = kmem_cache_alloc(qnx4_inode_cachep, SLAB_KERNEL);
if (!ei)
return NULL;
return &ei->vfs_inode;
}
static void qnx4_destroy_inode(struct inode *inode)
{
kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
}
static void init_once(void *foo, kmem_cache_t * cachep,
unsigned long flags)
{
struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
SLAB_CTOR_CONSTRUCTOR)
inode_init_once(&ei->vfs_inode);
}
static int init_inodecache(void)
{
qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
sizeof(struct qnx4_inode_info),
0, SLAB_RECLAIM_ACCOUNT,
init_once, NULL);
if (qnx4_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
if (kmem_cache_destroy(qnx4_inode_cachep))
printk(KERN_INFO
"qnx4_inode_cache: not all structures were freed\n");
}
static struct super_block *qnx4_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
}
static struct file_system_type qnx4_fs_type = {
.owner = THIS_MODULE,
.name = "qnx4",
.get_sb = qnx4_get_sb,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
static int __init init_qnx4_fs(void)
{
int err;
err = init_inodecache();
if (err)
return err;
err = register_filesystem(&qnx4_fs_type);
if (err) {
destroy_inodecache();
return err;
}
printk("QNX4 filesystem 0.2.3 registered.\n");
return 0;
}
static void __exit exit_qnx4_fs(void)
{
unregister_filesystem(&qnx4_fs_type);
destroy_inodecache();
}
module_init(init_qnx4_fs)
module_exit(exit_qnx4_fs)
MODULE_LICENSE("GPL");
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