89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
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/*
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* QNX4 file system, Linux implementation.
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*
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* Version : 0.2.1
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*
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* Using parts of the xiafs filesystem.
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*
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* History :
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*
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* 28-05-1998 by Richard Frowijn : first release.
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* 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
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*/
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#include <linux/smp_lock.h>
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#include <linux/buffer_head.h>
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#include "qnx4.h"
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static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
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{
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struct inode *inode = filp->f_path.dentry->d_inode;
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unsigned int offset;
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struct buffer_head *bh;
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struct qnx4_inode_entry *de;
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struct qnx4_link_info *le;
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unsigned long blknum;
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int ix, ino;
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int size;
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QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
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QNX4DEBUG(("filp->f_pos = %ld\n", (long) filp->f_pos));
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lock_kernel();
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while (filp->f_pos < inode->i_size) {
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blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
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bh = sb_bread(inode->i_sb, blknum);
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if(bh==NULL) {
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printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
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break;
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}
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ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
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while (ix < QNX4_INODES_PER_BLOCK) {
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offset = ix * QNX4_DIR_ENTRY_SIZE;
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de = (struct qnx4_inode_entry *) (bh->b_data + offset);
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size = strlen(de->di_fname);
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if (size) {
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if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
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size = QNX4_SHORT_NAME_MAX;
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else if ( size > QNX4_NAME_MAX )
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size = QNX4_NAME_MAX;
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if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
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QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname));
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if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
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ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
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else {
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le = (struct qnx4_link_info*)de;
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ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
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QNX4_INODES_PER_BLOCK +
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le->dl_inode_ndx;
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}
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if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
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brelse(bh);
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goto out;
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}
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}
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}
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ix++;
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filp->f_pos += QNX4_DIR_ENTRY_SIZE;
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}
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brelse(bh);
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}
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out:
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unlock_kernel();
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return 0;
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}
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const struct file_operations qnx4_dir_operations =
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{
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.read = generic_read_dir,
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.readdir = qnx4_readdir,
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.fsync = simple_fsync,
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};
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const struct inode_operations qnx4_dir_inode_operations =
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{
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.lookup = qnx4_lookup,
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};
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