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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [qnx4/] [dir.c] - Rev 1765
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/* * QNX4 file system, Linux implementation. * * Version : 0.2.1 * * Using parts of the xiafs filesystem. * * History : * * 28-05-1998 by Richard Frowijn : first release. * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support. */ #include <linux/config.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/fs.h> #include <linux/qnx4_fs.h> #include <linux/stat.h> #include <asm/segment.h> static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir) { struct inode *inode = filp->f_dentry->d_inode; unsigned int offset; struct buffer_head *bh; struct qnx4_inode_entry *de; struct qnx4_link_info *le; unsigned long blknum; int ix, ino; int size; QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size)); QNX4DEBUG(("filp->f_pos = %ld\n", (long) filp->f_pos)); while (filp->f_pos < inode->i_size) { blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS ); bh = sb_bread(inode->i_sb, blknum); if(bh==NULL) { printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum); break; } ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK; while (ix < QNX4_INODES_PER_BLOCK) { offset = ix * QNX4_DIR_ENTRY_SIZE; de = (struct qnx4_inode_entry *) (bh->b_data + offset); size = strlen(de->di_fname); if (size) { if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX ) size = QNX4_SHORT_NAME_MAX; else if ( size > QNX4_NAME_MAX ) size = QNX4_NAME_MAX; if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) { QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname)); if ( ( de->di_status & QNX4_FILE_LINK ) == 0 ) ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1; else { le = (struct qnx4_link_info*)de; ino = ( le->dl_inode_blk - 1 ) * QNX4_INODES_PER_BLOCK + le->dl_inode_ndx; } if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) { brelse(bh); return 0; } } } ix++; filp->f_pos += QNX4_DIR_ENTRY_SIZE; } brelse(bh); } UPDATE_ATIME(inode); return 0; } struct file_operations qnx4_dir_operations = { read: generic_read_dir, readdir: qnx4_readdir, fsync: file_fsync, }; struct inode_operations qnx4_dir_inode_operations = { lookup: qnx4_lookup, #ifdef CONFIG_QNX4FS_RW create: qnx4_create, unlink: qnx4_unlink, rmdir: qnx4_rmdir, #endif };