1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * QNX4 file system, Linux implementation. 4 * 5 * Version : 0.2.1 6 * 7 * Using parts of the xiafs filesystem. 8 * 9 * History : 10 * 11 * 28-05-1998 by Richard Frowijn : first release. 12 * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support. 13 */ 14 15 #include <linux/buffer_head.h> 16 #include "qnx4.h" 17 18 static int qnx4_readdir(struct file *file, struct dir_context *ctx) 19 { 20 struct inode *inode = file_inode(file); 21 unsigned int offset; 22 struct buffer_head *bh; 23 unsigned long blknum; 24 int ix, ino; 25 int size; 26 27 QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size)); 28 QNX4DEBUG((KERN_INFO "pos = %ld\n", (long) ctx->pos)); 29 30 while (ctx->pos < inode->i_size) { 31 blknum = qnx4_block_map(inode, ctx->pos >> QNX4_BLOCK_SIZE_BITS); 32 bh = sb_bread(inode->i_sb, blknum); 33 if (bh == NULL) { 34 printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); 35 return 0; 36 } 37 ix = (ctx->pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; 38 for (; ix < QNX4_INODES_PER_BLOCK; ix++, ctx->pos += QNX4_DIR_ENTRY_SIZE) { 39 union qnx4_directory_entry *de; 40 const char *fname; 41 42 offset = ix * QNX4_DIR_ENTRY_SIZE; 43 de = (union qnx4_directory_entry *) (bh->b_data + offset); 44 45 fname = get_entry_fname(de, &size); 46 if (!fname) 47 continue; 48 49 if (!(de->de_status & QNX4_FILE_LINK)) { 50 ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; 51 } else { 52 ino = ( le32_to_cpu(de->link.dl_inode_blk) - 1 ) * 53 QNX4_INODES_PER_BLOCK + 54 de->link.dl_inode_ndx; 55 } 56 57 QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, fname)); 58 if (!dir_emit(ctx, fname, size, ino, DT_UNKNOWN)) { 59 brelse(bh); 60 return 0; 61 } 62 } 63 brelse(bh); 64 } 65 return 0; 66 } 67 68 const struct file_operations qnx4_dir_operations = 69 { 70 .llseek = generic_file_llseek, 71 .read = generic_read_dir, 72 .iterate_shared = qnx4_readdir, 73 .fsync = generic_file_fsync, 74 }; 75 76 const struct inode_operations qnx4_dir_inode_operations = 77 { 78 .lookup = qnx4_lookup, 79 }; 80