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 21#include <asm/segment.h> 22 23static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir) 24{ 25 struct inode *inode = filp->f_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 while (filp->f_pos < inode->i_size) { 38 blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS ); 39 bh = sb_bread(inode->i_sb, blknum); 40 if(bh==NULL) { 41 printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); 42 break; 43 } 44 ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; 45 while (ix < QNX4_INODES_PER_BLOCK) { 46 offset = ix * QNX4_DIR_ENTRY_SIZE; 47 de = (struct qnx4_inode_entry *) (bh->b_data + offset); 48 size = strlen(de->di_fname); 49 if (size) { 50 if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX ) 51 size = QNX4_SHORT_NAME_MAX; 52 else if ( size > QNX4_NAME_MAX ) 53 size = QNX4_NAME_MAX; 54 55 if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) { 56 QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname)); 57 if ( ( de->di_status & QNX4_FILE_LINK ) == 0 ) 58 ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; 59 else { 60 le = (struct qnx4_link_info*)de; 61 ino = ( le->dl_inode_blk - 1 ) * 62 QNX4_INODES_PER_BLOCK + 63 le->dl_inode_ndx; 64 } 65 if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) { 66 brelse(bh); 67 return 0; 68 } 69 } 70 } 71 ix++; 72 filp->f_pos += QNX4_DIR_ENTRY_SIZE; 73 } 74 brelse(bh); 75 } 76 UPDATE_ATIME(inode); 77 78 return 0; 79} 80 81struct file_operations qnx4_dir_operations = 82{ 83 read: generic_read_dir, 84 readdir: qnx4_readdir, 85 fsync: file_fsync, 86}; 87 88struct inode_operations qnx4_dir_inode_operations = 89{ 90 lookup: qnx4_lookup, 91#ifdef CONFIG_QNX4FS_RW 92 create: qnx4_create, 93 unlink: qnx4_unlink, 94 rmdir: qnx4_rmdir, 95#endif 96}; 97