/*
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/*
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* linux/fs/minix/dir.c
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* linux/fs/minix/dir.c
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*
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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*
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* minix directory handling functions
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* minix directory handling functions
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*/
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*/
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/fs.h>
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#include <linux/minix_fs.h>
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#include <linux/minix_fs.h>
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#include <linux/stat.h>
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#include <linux/stat.h>
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#include <asm/segment.h>
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#include <asm/segment.h>
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static int minix_dir_read(struct inode * inode, struct file * filp, char * buf, int count)
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static int minix_dir_read(struct inode * inode, struct file * filp, char * buf, int count)
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{
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{
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return -EISDIR;
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return -EISDIR;
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}
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}
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static int minix_readdir(struct inode *, struct file *, void *, filldir_t);
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static int minix_readdir(struct inode *, struct file *, void *, filldir_t);
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static struct file_operations minix_dir_operations = {
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static struct file_operations minix_dir_operations = {
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NULL, /* lseek - default */
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NULL, /* lseek - default */
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minix_dir_read, /* read */
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minix_dir_read, /* read */
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NULL, /* write - bad */
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NULL, /* write - bad */
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minix_readdir, /* readdir */
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minix_readdir, /* readdir */
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NULL, /* select - default */
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NULL, /* select - default */
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NULL, /* ioctl - default */
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NULL, /* ioctl - default */
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NULL, /* mmap */
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NULL, /* mmap */
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NULL, /* no special open code */
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NULL, /* no special open code */
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NULL, /* no special release code */
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NULL, /* no special release code */
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file_fsync /* default fsync */
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file_fsync /* default fsync */
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};
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};
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/*
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/*
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* directories can handle most operations...
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* directories can handle most operations...
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*/
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*/
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struct inode_operations minix_dir_inode_operations = {
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struct inode_operations minix_dir_inode_operations = {
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&minix_dir_operations, /* default directory file-ops */
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&minix_dir_operations, /* default directory file-ops */
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minix_create, /* create */
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minix_create, /* create */
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minix_lookup, /* lookup */
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minix_lookup, /* lookup */
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minix_link, /* link */
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minix_link, /* link */
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minix_unlink, /* unlink */
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minix_unlink, /* unlink */
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minix_symlink, /* symlink */
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minix_symlink, /* symlink */
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minix_mkdir, /* mkdir */
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minix_mkdir, /* mkdir */
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minix_rmdir, /* rmdir */
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minix_rmdir, /* rmdir */
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minix_mknod, /* mknod */
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minix_mknod, /* mknod */
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minix_rename, /* rename */
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minix_rename, /* rename */
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NULL, /* readlink */
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NULL, /* readlink */
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NULL, /* follow_link */
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NULL, /* follow_link */
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NULL, /* readpage */
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NULL, /* readpage */
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NULL, /* writepage */
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NULL, /* writepage */
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NULL, /* bmap */
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NULL, /* bmap */
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minix_truncate, /* truncate */
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minix_truncate, /* truncate */
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NULL /* permission */
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NULL /* permission */
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};
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};
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static int minix_readdir(struct inode * inode, struct file * filp,
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static int minix_readdir(struct inode * inode, struct file * filp,
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void * dirent, filldir_t filldir)
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void * dirent, filldir_t filldir)
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{
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{
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unsigned int offset;
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unsigned int offset;
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struct buffer_head * bh;
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struct buffer_head * bh;
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struct minix_dir_entry * de;
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struct minix_dir_entry * de;
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struct minix_sb_info * info;
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struct minix_sb_info * info;
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if (!inode || !inode->i_sb || !S_ISDIR(inode->i_mode))
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if (!inode || !inode->i_sb || !S_ISDIR(inode->i_mode))
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return -EBADF;
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return -EBADF;
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info = &inode->i_sb->u.minix_sb;
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info = &inode->i_sb->u.minix_sb;
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if (filp->f_pos & (info->s_dirsize - 1))
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if (filp->f_pos & (info->s_dirsize - 1))
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return -EBADF;
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return -EBADF;
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while (filp->f_pos < inode->i_size) {
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while (filp->f_pos < inode->i_size) {
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offset = filp->f_pos & 1023;
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offset = filp->f_pos & 1023;
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bh = minix_bread(inode,(filp->f_pos)>>BLOCK_SIZE_BITS,0);
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bh = minix_bread(inode,(filp->f_pos)>>BLOCK_SIZE_BITS,0);
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if (!bh) {
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if (!bh) {
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filp->f_pos += 1024-offset;
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filp->f_pos += 1024-offset;
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continue;
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continue;
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}
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}
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do {
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do {
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de = (struct minix_dir_entry *) (offset + bh->b_data);
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de = (struct minix_dir_entry *) (offset + bh->b_data);
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if (de->inode) {
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if (de->inode) {
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int size = strnlen(de->name, info->s_namelen);
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int size = strnlen(de->name, info->s_namelen);
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if (filldir(dirent, de->name, size, filp->f_pos, de->inode) < 0) {
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if (filldir(dirent, de->name, size, filp->f_pos, de->inode) < 0) {
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brelse(bh);
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brelse(bh);
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return 0;
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return 0;
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}
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}
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}
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}
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offset += info->s_dirsize;
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offset += info->s_dirsize;
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filp->f_pos += info->s_dirsize;
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filp->f_pos += info->s_dirsize;
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} while (offset < 1024 && filp->f_pos < inode->i_size);
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} while (offset < 1024 && filp->f_pos < inode->i_size);
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brelse(bh);
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brelse(bh);
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}
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}
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return 0;
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return 0;
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}
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}
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