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;
}
static struct dentry *qnx4_follow_link(struct dentry *dentry,
struct dentry *base, unsigned int follow)
{
struct inode *inode = dentry->d_inode;
struct buffer_head *bh;
if ( !inode ) {
return ERR_PTR(-ENOENT);
}
if ( !( bh = qnx4_bread( inode, 0, 0 ) ) ) {
dput( base );
return ERR_PTR(-EIO);
}
UPDATE_ATIME( inode );
base = lookup_dentry( bh->b_data, base, follow );
brelse( bh );
return base;
}
static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
const char *name, struct qnx4_inode_entry **res_dir, int *ino)
{
unsigned long block, offset, blkofs;
struct buffer_head *bh;
*res_dir = NULL;
if (!dir->i_sb) {
printk("qnx4: no superblock on dir.\n");
return NULL;
}
bh = NULL;
block = offset = blkofs = 0;
while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
if (!bh) {
bh = qnx4_bread(dir, blkofs, 0);
if (!bh) {
blkofs++;
continue;
}
}
*res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
if (qnx4_match(len, name, bh, &offset)) {
block = qnx4_block_map( dir, blkofs );
*ino = block * QNX4_INODES_PER_BLOCK +
(offset / QNX4_DIR_ENTRY_SIZE) - 1;
return bh;
}
if (offset < bh->b_size) {
continue;
}
brelse(bh);
bh = NULL;
offset = 0;
blkofs++;
}
brelse(bh);
*res_dir = NULL;
return NULL;
}