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/config.h> 15 #include <linux/string.h> 16 #include <linux/errno.h> 17 #include <linux/fs.h> 18 #include <linux/qnx4_fs.h> 19 #include <linux/stat.h> 20 #include <linux/smp_lock.h> 21 #include <linux/buffer_head.h> 22 23 24 static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir) 25 { 26 struct inode *inode = filp->f_dentry->d_inode; 27 unsigned int offset; 28 struct buffer_head *bh; 29 struct qnx4_inode_entry *de; 30 struct qnx4_link_info *le; 31 unsigned long blknum; 32 int ix, ino; 33 int size; 34 35 QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size)); 36 QNX4DEBUG(("filp->f_pos = %ld\n", (long) filp->f_pos)); 37 38 lock_kernel(); 39 40 while (filp->f_pos < inode->i_size) { 41 blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS ); 42 bh = sb_bread(inode->i_sb, blknum); 43 if(bh==NULL) { 44 printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); 45 break; 46 } 47 ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; 48 while (ix < QNX4_INODES_PER_BLOCK) { 49 offset = ix * QNX4_DIR_ENTRY_SIZE; 50 de = (struct qnx4_inode_entry *) (bh->b_data + offset); 51 size = strlen(de->di_fname); 52 if (size) { 53 if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX ) 54 size = QNX4_SHORT_NAME_MAX; 55 else if ( size > QNX4_NAME_MAX ) 56 size = QNX4_NAME_MAX; 57 58 if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) { 59 QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname)); 60 if ( ( de->di_status & QNX4_FILE_LINK ) == 0 ) 61 ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; 62 else { 63 le = (struct qnx4_link_info*)de; 64 ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) * 65 QNX4_INODES_PER_BLOCK + 66 le->dl_inode_ndx; 67 } 68 if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) { 69 brelse(bh); 70 goto out; 71 } 72 } 73 } 74 ix++; 75 filp->f_pos += QNX4_DIR_ENTRY_SIZE; 76 } 77 brelse(bh); 78 } 79 out: 80 unlock_kernel(); 81 return 0; 82 } 83 84 struct file_operations qnx4_dir_operations = 85 { 86 .read = generic_read_dir, 87 .readdir = qnx4_readdir, 88 .fsync = file_fsync, 89 }; 90 91 struct inode_operations qnx4_dir_inode_operations = 92 { 93 .lookup = qnx4_lookup, 94 #ifdef CONFIG_QNX4FS_RW 95 .create = qnx4_create, 96 .unlink = qnx4_unlink, 97 .rmdir = qnx4_rmdir, 98 #endif 99 }; 100