1 /* 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 * 28-05-1998 by Richard Frowijn : first release. 11 * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support. 12 */ 13 14 #include <linux/buffer_head.h> 15 #include "qnx4.h" 16 17 static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir) 18 { 19 struct inode *inode = file_inode(filp); 20 unsigned int offset; 21 struct buffer_head *bh; 22 struct qnx4_inode_entry *de; 23 struct qnx4_link_info *le; 24 unsigned long blknum; 25 int ix, ino; 26 int size; 27 28 QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size)); 29 QNX4DEBUG((KERN_INFO "filp->f_pos = %ld\n", (long) filp->f_pos)); 30 31 while (filp->f_pos < inode->i_size) { 32 blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS ); 33 bh = sb_bread(inode->i_sb, blknum); 34 if(bh==NULL) { 35 printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); 36 break; 37 } 38 ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; 39 while (ix < QNX4_INODES_PER_BLOCK) { 40 offset = ix * QNX4_DIR_ENTRY_SIZE; 41 de = (struct qnx4_inode_entry *) (bh->b_data + offset); 42 size = strlen(de->di_fname); 43 if (size) { 44 if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX ) 45 size = QNX4_SHORT_NAME_MAX; 46 else if ( size > QNX4_NAME_MAX ) 47 size = QNX4_NAME_MAX; 48 49 if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) { 50 QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname)); 51 if ( ( de->di_status & QNX4_FILE_LINK ) == 0 ) 52 ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; 53 else { 54 le = (struct qnx4_link_info*)de; 55 ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) * 56 QNX4_INODES_PER_BLOCK + 57 le->dl_inode_ndx; 58 } 59 if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) { 60 brelse(bh); 61 goto out; 62 } 63 } 64 } 65 ix++; 66 filp->f_pos += QNX4_DIR_ENTRY_SIZE; 67 } 68 brelse(bh); 69 } 70 out: 71 return 0; 72 } 73 74 const struct file_operations qnx4_dir_operations = 75 { 76 .llseek = generic_file_llseek, 77 .read = generic_read_dir, 78 .readdir = qnx4_readdir, 79 .fsync = generic_file_fsync, 80 }; 81 82 const struct inode_operations qnx4_dir_inode_operations = 83 { 84 .lookup = qnx4_lookup, 85 }; 86