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1628 |
jcastillo |
/*
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* linux/fs/ufs/ufs_dir.c
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*
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* Copyright (C) 1996
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* Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
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* Laboratory for Computer Science Research Computing Facility
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* Rutgers, The State University of New Jersey
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*
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* $Id: ufs_dir.c,v 1.1 2005-12-20 10:26:35 jcastillo Exp $
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*
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*/
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#include <linux/fs.h>
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/* XXX */
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extern int ufs_lookup (struct inode *, const char *, int, struct inode **);
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extern int ufs_bmap (struct inode *, int);
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extern void ufs_print_inode (struct inode *);
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/*
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* This is blatantly stolen from ext2fs
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*/
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static int
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ufs_readdir (struct inode * inode, struct file * filp, void * dirent,
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filldir_t filldir)
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{
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int error = 0;
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unsigned long offset, lblk, blk;
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int i, stored;
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struct buffer_head * bh;
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struct ufs_direct * de;
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struct super_block * sb;
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if (!inode || !S_ISDIR(inode->i_mode))
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return -EBADF;
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sb = inode->i_sb;
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if (inode->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
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printk("ufs_readdir: ino %lu f_pos %lu\n",
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inode->i_ino, (unsigned long) filp->f_pos);
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ufs_print_inode(inode);
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}
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stored = 0;
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bh = NULL;
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offset = filp->f_pos & (sb->s_blocksize - 1);
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while (!error && !stored && filp->f_pos < inode->i_size) {
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lblk = (filp->f_pos) >> sb->s_blocksize_bits;
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blk = ufs_bmap(inode, lblk);
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/* XXX - ufs_bmap() call needs error checking */
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blk = ufs_bmap(inode, lblk);
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bh = bread (sb->s_dev, blk, sb->s_blocksize);
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if (!bh) {
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/* XXX - error - skip to the next block */
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printk("ufs_readdir: dir inode %lu has a hole at offset %lu\n",
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inode->i_ino, (unsigned long int)filp->f_pos);
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filp->f_pos += sb->s_blocksize - offset;
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continue;
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}
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revalidate:
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/* If the dir block has changed since the last call to
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* readdir(2), then we might be pointing to an invalid
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* dirent right now. Scan from the start of the block
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* to make sure. */
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if (filp->f_version != inode->i_version) {
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for (i = 0; i < sb->s_blocksize && i < offset; ) {
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de = (struct ufs_direct *)
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(bh->b_data + i);
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/* It's too expensive to do a full
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* dirent test each time round this
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* loop, but we do have to test at
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* least that it is non-zero. A
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* failure will be detected in the
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* dirent test below. */
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if (de->d_reclen < 1)
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break;
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i += de->d_reclen;
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}
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offset = i;
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filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1))
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| offset;
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filp->f_version = inode->i_version;
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}
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while (!error && filp->f_pos < inode->i_size
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&& offset < sb->s_blocksize) {
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de = (struct ufs_direct *) (bh->b_data + offset);
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/* XXX - put in a real ufs_check_dir_entry() */
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if ((de->d_reclen == 0) || (de->d_namlen == 0)) {
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filp->f_pos = (filp->f_pos & (sb->s_blocksize - 1)) + sb->s_blocksize;
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brelse(bh);
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return stored;
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}
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#if 0
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if (!ext2_check_dir_entry ("ext2_readdir", inode, de,
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bh, offset)) {
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/* On error, skip the f_pos to the
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next block. */
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filp->f_pos = (filp->f_pos & (sb->s_blocksize - 1))
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+ sb->s_blocksize;
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brelse (bh);
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return stored;
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}
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#endif /* XXX */
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offset += de->d_reclen;
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if (de->d_ino) {
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/* We might block in the next section
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* if the data destination is
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* currently swapped out. So, use a
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* version stamp to detect whether or
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* not the directory has been modified
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* during the copy operation. */
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unsigned long version;
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dcache_add(inode, de->d_name, de->d_namlen,
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de->d_ino);
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version = inode->i_version;
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if (inode->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
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printk("ufs_readdir: filldir(%s,%u)\n",
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de->d_name, de->d_ino);
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}
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error = filldir(dirent, de->d_name, de->d_namlen, filp->f_pos, de->d_ino);
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if (error)
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break;
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if (version != inode->i_version)
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goto revalidate;
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stored ++;
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}
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filp->f_pos += de->d_reclen;
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}
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offset = 0;
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brelse (bh);
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}
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#if 0 /* XXX */
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if (!IS_RDONLY(inode)) {
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inode->i_atime = CURRENT_TIME;
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inode->i_dirt = 1;
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}
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#endif /* XXX */
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return 0;
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}
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static struct file_operations ufs_dir_operations = {
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NULL, /* lseek */
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NULL, /* read */
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NULL, /* write */
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ufs_readdir, /* readdir */
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NULL, /* select */
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NULL, /* ioctl */
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NULL, /* mmap */
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NULL, /* open */
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NULL, /* release */
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file_fsync, /* fsync */
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NULL, /* fasync */
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NULL, /* check_media_change */
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NULL, /* revalidate */
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};
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struct inode_operations ufs_dir_inode_operations = {
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&ufs_dir_operations, /* default directory file operations */
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NULL, /* create */
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ufs_lookup, /* lookup */
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NULL, /* link */
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NULL, /* unlink */
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NULL, /* symlink */
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NULL, /* mkdir */
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NULL, /* rmdir */
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NULL, /* mknod */
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NULL, /* rename */
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NULL, /* readlink */
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NULL, /* follow_link */
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NULL, /* readpage */
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NULL, /* writepage */
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NULL, /* bmap */
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NULL, /* truncate */
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NULL, /* permission */
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NULL, /* smap */
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};
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/*
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* Local Variables: ***
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* c-indent-level: 8 ***
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* c-continued-statement-offset: 8 ***
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* c-brace-offset: -8 ***
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* c-argdecl-indent: 0 ***
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* c-label-offset: -8 ***
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* End: ***
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*/
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