int qnx4_is_free(struct super_block *sb, long block)
{
int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
struct buffer_head *bh;
const char *g;
int ret = -EIO;
start += block / (QNX4_BLOCK_SIZE * 8);
QNX4DEBUG(("qnx4: is_free requesting block [%lu], bitmap in block [%lu]\n",
(unsigned long) block, (unsigned long) start));
(void) size; /* CHECKME */
bh = sb_bread(sb, start);
if (bh == NULL) {
return -EIO;
}
g = bh->b_data + (block % QNX4_BLOCK_SIZE);
if (((*g) & (1 << (block % 8))) == 0) {
QNX4DEBUG(("qnx4: is_free -> block is free\n"));
ret = 1;
} else {
QNX4DEBUG(("qnx4: is_free -> block is busy\n"));
ret = 0;
}
brelse(bh);
return ret;
}
static int qnx4_readlink(struct dentry *dentry, char *buffer, int buflen)
{
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
int i;
char c;
QNX4DEBUG(("qnx4: qnx4_readlink() called\n"));
if (buffer == NULL || inode == NULL || !S_ISLNK(inode->i_mode)) {
return -EINVAL;
}
if (buflen > 1023) {
buflen = 1023;
}
bh = qnx4_bread( inode, 0, 0 );
if (bh == NULL) {
QNX4DEBUG(("qnx4: NULL symlink bh\n"));
return 0;
}
QNX4DEBUG(("qnx4: qnx4_bread sym called -> [%s]\n",
bh->b_data));
i = 0;
while (i < buflen && (c = bh->b_data[i])) {
i++;
put_user(c, buffer++);
}
brelse(bh);
return i;
}
/*
* 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;
if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/')
return "no qnx4 filesystem (no root dir).";
QNX4DEBUG((KERN_NOTICE "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.";
rootdir = (struct qnx4_inode_entry *) bh->b_data;
for (i = 0; i < QNX4_INODES_PER_BLOCK; i++, rootdir++) {
QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
if (strcmp(rootdir->di_fname, QNX4_BMNAME) != 0)
continue;
qnx4_sb(sb)->BitMap = kmemdup(rootdir,
sizeof(struct qnx4_inode_entry),
GFP_KERNEL);
brelse(bh);
if (!qnx4_sb(sb)->BitMap)
return "not enough memory for bitmap inode";
/* keep bitmap inode known */
return NULL;
}
brelse(bh);
}
return "bitmap file not found.";
}
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);
u16 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((KERN_ERR "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((KERN_ERR "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((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
return block;
}
int qnx4_rmdir(struct inode *dir, struct dentry *dentry)
{
struct buffer_head *bh;
struct qnx4_inode_entry *de;
struct inode *inode;
int retval;
int ino;
QNX4DEBUG(("qnx4: qnx4_rmdir [%s]\n", dentry->d_name.name));
lock_kernel();
bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
&de, &ino);
if (bh == NULL) {
unlock_kernel();
return -ENOENT;
}
inode = dentry->d_inode;
if (inode->i_ino != ino) {
retval = -EIO;
goto end_rmdir;
}
#if 0
if (!empty_dir(inode)) {
retval = -ENOTEMPTY;
goto end_rmdir;
}
#endif
if (inode->i_nlink != 2) {
QNX4DEBUG(("empty directory has nlink!=2 (%d)\n", inode->i_nlink));
}
QNX4DEBUG(("qnx4: deleting directory\n"));
de->di_status = 0;
memset(de->di_fname, 0, sizeof de->di_fname);
de->di_mode = 0;
mark_buffer_dirty(bh);
inode->i_nlink = 0;
mark_inode_dirty(inode);
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
dir->i_nlink--;
mark_inode_dirty(dir);
retval = 0;
end_rmdir:
brelse(bh);
unlock_kernel();
return retval;
}
int qnx4_set_bitmap(struct super_block *sb, long block, int busy)
{
int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
struct buffer_head *bh;
char *g;
start += block / (QNX4_BLOCK_SIZE * 8);
QNX4DEBUG(("qnx4: set_bitmap requesting block [%lu], bitmap in block [%lu]\n",
(unsigned long) block, (unsigned long) start));
(void) size; /* CHECKME */
bh = sb_bread(sb, start);
if (bh == NULL) {
return -EIO;
}
g = bh->b_data + (block % QNX4_BLOCK_SIZE);
if (busy == 0) {
(*g) &= ~(1 << (block % 8));
} else {
(*g) |= (1 << (block % 8));
}
mark_buffer_dirty(bh);
brelse(bh);
return 0;
}
struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
int ino;
struct qnx4_inode_entry *de;
struct qnx4_link_info *lnk;
struct buffer_head *bh;
const char *name = dentry->d_name.name;
int len = dentry->d_name.len;
struct inode *foundinode = NULL;
lock_kernel();
if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
goto out;
/* The entry is linked, let's get the real info */
if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
lnk = (struct qnx4_link_info *) de;
ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
QNX4_INODES_PER_BLOCK +
lnk->dl_inode_ndx;
}
brelse(bh);
foundinode = qnx4_iget(dir->i_sb, ino);
if (IS_ERR(foundinode)) {
unlock_kernel();
QNX4DEBUG(("qnx4: lookup->iget -> error %ld\n",
PTR_ERR(foundinode)));
return ERR_CAST(foundinode);
}
out:
unlock_kernel();
d_add(dentry, foundinode);
return NULL;
}
static void qnx4_write_super(struct super_block *sb)
{
lock_kernel();
QNX4DEBUG(("qnx4: write_super\n"));
sb->s_dirt = 0;
unlock_kernel();
}
struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
int ino;
struct qnx4_inode_entry *de;
struct qnx4_link_info *lnk;
struct buffer_head *bh;
const char *name = dentry->d_name.name;
int len = dentry->d_name.len;
struct inode *foundinode = NULL;
if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
goto out;
/* The entry is linked, let's get the real info */
if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
lnk = (struct qnx4_link_info *) de;
ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
QNX4_INODES_PER_BLOCK +
lnk->dl_inode_ndx;
}
brelse(bh);
foundinode = qnx4_iget(dir->i_sb, ino);
if (IS_ERR(foundinode))
QNX4DEBUG((KERN_ERR "qnx4: lookup->iget -> error %ld\n",
PTR_ERR(foundinode)));
out:
return d_splice_alias(foundinode, dentry);
}
static void qnx4_write_super(struct super_block *sb)
{
lock_kernel();
QNX4DEBUG(("qnx4: write_super\n"));
mark_sb_clean(sb);
unlock_kernel();
}
/*
* 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 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);
}
int qnx4_unlink(struct inode *dir, struct dentry *dentry)
{
struct buffer_head *bh;
struct qnx4_inode_entry *de;
struct inode *inode;
int retval;
int ino;
QNX4DEBUG(("qnx4: qnx4_unlink [%s]\n", dentry->d_name.name));
lock_kernel();
bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
&de, &ino);
if (bh == NULL) {
unlock_kernel();
return -ENOENT;
}
inode = dentry->d_inode;
if (inode->i_ino != ino) {
retval = -EIO;
goto end_unlink;
}
retval = -EPERM;
if (!inode->i_nlink) {
QNX4DEBUG(("Deleting nonexistent file (%s:%lu), %d\n",
inode->i_sb->s_id,
inode->i_ino, inode->i_nlink));
inode->i_nlink = 1;
}
de->di_status = 0;
memset(de->di_fname, 0, sizeof de->di_fname);
de->di_mode = 0;
mark_buffer_dirty(bh);
dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
mark_inode_dirty(dir);
inode->i_nlink--;
inode->i_ctime = dir->i_ctime;
mark_inode_dirty(inode);
retval = 0;
end_unlink:
unlock_kernel();
brelse(bh);
return retval;
}
int qnx4_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
QNX4DEBUG(("qnx4: qnx4_create\n"));
if (dir == NULL) {
return -ENOENT;
}
return -ENOSPC;
}
static void qnx4_delete_inode(struct inode *inode)
{
QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
truncate_inode_pages(&inode->i_data, 0);
inode->i_size = 0;
qnx4_truncate(inode);
lock_kernel();
qnx4_free_inode(inode);
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;
}
static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
{
unsigned long phys;
QNX4DEBUG((KERN_INFO "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);
}
return 0;
}
void qnx4_truncate(struct inode *inode)
{
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode))) {
return;
}
if (!(S_ISDIR(inode->i_mode))) {
/* TODO */
}
QNX4DEBUG(("qnx4: qnx4_truncate called\n"));
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
mark_inode_dirty(inode);
}
struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
{
struct buffer_head *bh;
struct qnx4_inode_entry *raw_inode;
int block;
struct qnx4_inode_entry *qnx4_inode;
struct inode *inode;
inode = iget_locked(sb, ino);
if (!inode)
return ERR_PTR(-ENOMEM);
if (!(inode->i_state & I_NEW))
return inode;
qnx4_inode = qnx4_raw_inode(inode);
inode->i_mode = 0;
QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
if (!ino) {
printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
"out of range\n",
sb->s_id, ino);
iget_failed(inode);
return ERR_PTR(-EIO);
}
block = ino / QNX4_INODES_PER_BLOCK;
if (!(bh = sb_bread(sb, block))) {
printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
"%s\n", sb->s_id);
iget_failed(inode);
return ERR_PTR(-EIO);
}
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);
memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
if (S_ISREG(inode->i_mode)) {
inode->i_fop = &generic_ro_fops;
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(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
ino, sb->s_id);
iget_failed(inode);
brelse(bh);
return ERR_PTR(-EIO);
}
brelse(bh);
unlock_new_inode(inode);
return inode;
}
