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