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/smp_lock.h> 15 #include <linux/buffer_head.h> 16 #include "qnx4.h" 17 18 static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir) 19 { 20 struct inode *inode = filp->f_path.dentry->d_inode; 21 unsigned int offset; 22 struct buffer_head *bh; 23 struct qnx4_inode_entry *de; 24 struct qnx4_link_info *le; 25 unsigned long blknum; 26 int ix, ino; 27 int size; 28 29 QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size)); 30 QNX4DEBUG((KERN_INFO "filp->f_pos = %ld\n", (long) filp->f_pos)); 31 32 lock_kernel(); 33 34 while (filp->f_pos < inode->i_size) { 35 blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS ); 36 bh = sb_bread(inode->i_sb, blknum); 37 if(bh==NULL) { 38 printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); 39 break; 40 } 41 ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; 42 while (ix < QNX4_INODES_PER_BLOCK) { 43 offset = ix * QNX4_DIR_ENTRY_SIZE; 44 de = (struct qnx4_inode_entry *) (bh->b_data + offset); 45 size = strlen(de->di_fname); 46 if (size) { 47 if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX ) 48 size = QNX4_SHORT_NAME_MAX; 49 else if ( size > QNX4_NAME_MAX ) 50 size = QNX4_NAME_MAX; 51 52 if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) { 53 QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname)); 54 if ( ( de->di_status & QNX4_FILE_LINK ) == 0 ) 55 ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; 56 else { 57 le = (struct qnx4_link_info*)de; 58 ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) * 59 QNX4_INODES_PER_BLOCK + 60 le->dl_inode_ndx; 61 } 62 if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) { 63 brelse(bh); 64 goto out; 65 } 66 } 67 } 68 ix++; 69 filp->f_pos += QNX4_DIR_ENTRY_SIZE; 70 } 71 brelse(bh); 72 } 73 out: 74 unlock_kernel(); 75 return 0; 76 } 77 78 const struct file_operations qnx4_dir_operations = 79 { 80 .llseek = generic_file_llseek, 81 .read = generic_read_dir, 82 .readdir = qnx4_readdir, 83 .fsync = generic_file_fsync, 84 }; 85 86 const struct inode_operations qnx4_dir_inode_operations = 87 { 88 .lookup = qnx4_lookup, 89 }; 90