1 files changed, 320 insertions, 0 deletions

diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
new file mode 100644
index 0000000..0217c3a
--- /dev/null
+++ b/fs/hpfs/dir.c
@@ -0,0 +1,320 @@
+/*
+ *  linux/fs/hpfs/dir.c
+ *
+ *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ *  directory VFS functions
+ */
+
+#include "hpfs_fn.h"
+
+static int hpfs_dir_release(struct inode *inode, struct file *filp)
+{
+	lock_kernel();
+	hpfs_del_pos(inode, &filp->f_pos);
+	/*hpfs_write_if_changed(inode);*/
+	unlock_kernel();
+	return 0;
+}
+
+/* This is slow, but it's not used often */
+
+static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
+{
+	loff_t new_off = off + (whence == 1 ? filp->f_pos : 0);
+	loff_t pos;
+	struct quad_buffer_head qbh;
+	struct inode *i = filp->f_dentry->d_inode;
+	struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
+	struct super_block *s = i->i_sb;
+
+	lock_kernel();
+
+	/*printk("dir lseek\n");*/
+	if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
+	down(&i->i_sem);
+	pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1;
+	while (pos != new_off) {
+		if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
+		else goto fail;
+		if (pos == 12) goto fail;
+	}
+	up(&i->i_sem);
+ok:
+	unlock_kernel();
+	return filp->f_pos = new_off;
+fail:
+	up(&i->i_sem);
+	/*printk("illegal lseek: %016llx\n", new_off);*/
+	unlock_kernel();
+	return -ESPIPE;
+}
+
+static int hpfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+	struct inode *inode = filp->f_dentry->d_inode;
+	struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
+	struct quad_buffer_head qbh;
+	struct hpfs_dirent *de;
+	int lc;
+	long old_pos;
+	char *tempname;
+	int c1, c2 = 0;
+	int ret = 0;
+
+	lock_kernel();
+
+	if (hpfs_sb(inode->i_sb)->sb_chk) {
+		if (hpfs_chk_sectors(inode->i_sb, inode->i_ino, 1, "dir_fnode")) {
+			ret = -EFSERROR;
+			goto out;
+		}
+		if (hpfs_chk_sectors(inode->i_sb, hpfs_inode->i_dno, 4, "dir_dnode")) {
+			ret = -EFSERROR;
+			goto out;
+		}
+	}
+	if (hpfs_sb(inode->i_sb)->sb_chk >= 2) {
+		struct buffer_head *bh;
+		struct fnode *fno;
+		int e = 0;
+		if (!(fno = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) {
+			ret = -EIOERROR;
+			goto out;
+		}
+		if (!fno->dirflag) {
+			e = 1;
+			hpfs_error(inode->i_sb, "not a directory, fnode %08x",inode->i_ino);
+		}
+		if (hpfs_inode->i_dno != fno->u.external[0].disk_secno) {
+			e = 1;
+			hpfs_error(inode->i_sb, "corrupted inode: i_dno == %08x, fnode -> dnode == %08x", hpfs_inode->i_dno, fno->u.external[0].disk_secno);
+		}
+		brelse(bh);
+		if (e) {
+			ret = -EFSERROR;
+			goto out;
+		}
+	}
+	lc = hpfs_sb(inode->i_sb)->sb_lowercase;
+	if (filp->f_pos == 12) { /* diff -r requires this (note, that diff -r */
+		filp->f_pos = 13; /* also fails on msdos filesystem in 2.0) */
+		goto out;
+	}
+	if (filp->f_pos == 13) {
+		ret = -ENOENT;
+		goto out;
+	}
+	
+	while (1) {
+		again:
+		/* This won't work when cycle is longer than number of dirents
+		   accepted by filldir, but what can I do?
+		   maybe killall -9 ls helps */
+		if (hpfs_sb(inode->i_sb)->sb_chk)
+			if (hpfs_stop_cycles(inode->i_sb, filp->f_pos, &c1, &c2, "hpfs_readdir")) {
+				ret = -EFSERROR;
+				goto out;
+			}
+		if (filp->f_pos == 12)
+			goto out;
+		if (filp->f_pos == 3 || filp->f_pos == 4 || filp->f_pos == 5) {
+			printk("HPFS: warning: pos==%d\n",(int)filp->f_pos);
+			goto out;
+		}
+		if (filp->f_pos == 0) {
+			if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0)
+				goto out;
+			filp->f_pos = 11;
+		}
+		if (filp->f_pos == 11) {
+			if (filldir(dirent, "..", 2, filp->f_pos, hpfs_inode->i_parent_dir, DT_DIR) < 0)
+				goto out;
+			filp->f_pos = 1;
+		}
+		if (filp->f_pos == 1) {
+			filp->f_pos = ((loff_t) hpfs_de_as_down_as_possible(inode->i_sb, hpfs_inode->i_dno) << 4) + 1;
+			hpfs_add_pos(inode, &filp->f_pos);
+			filp->f_version = inode->i_version;
+		}
+		old_pos = filp->f_pos;
+		if (!(de = map_pos_dirent(inode, &filp->f_pos, &qbh))) {
+			ret = -EIOERROR;
+			goto out;
+		}
+		if (de->first || de->last) {
+			if (hpfs_sb(inode->i_sb)->sb_chk) {
+				if (de->first && !de->last && (de->namelen != 2 || de ->name[0] != 1 || de->name[1] != 1)) hpfs_error(inode->i_sb, "hpfs_readdir: bad ^A^A entry; pos = %08x", old_pos);
+				if (de->last && (de->namelen != 1 || de ->name[0] != 255)) hpfs_error(inode->i_sb, "hpfs_readdir: bad \\377 entry; pos = %08x", old_pos);
+			}
+			hpfs_brelse4(&qbh);
+			goto again;
+		}
+		tempname = hpfs_translate_name(inode->i_sb, de->name, de->namelen, lc, de->not_8x3);
+		if (filldir(dirent, tempname, de->namelen, old_pos, de->fnode, DT_UNKNOWN) < 0) {
+			filp->f_pos = old_pos;
+			if (tempname != (char *)de->name) kfree(tempname);
+			hpfs_brelse4(&qbh);
+			goto out;
+		}
+		if (tempname != (char *)de->name) kfree(tempname);
+		hpfs_brelse4(&qbh);
+	}
+out:
+	unlock_kernel();
+	return ret;
+}
+
+/*
+ * lookup.  Search the specified directory for the specified name, set
+ * *result to the corresponding inode.
+ *
+ * lookup uses the inode number to tell read_inode whether it is reading
+ * the inode of a directory or a file -- file ino's are odd, directory
+ * ino's are even.  read_inode avoids i/o for file inodes; everything
+ * needed is up here in the directory.  (And file fnodes are out in
+ * the boondocks.)
+ *
+ *    - M.P.: this is over, sometimes we've got to read file's fnode for eas
+ *	      inode numbers are just fnode sector numbers; iget lock is used
+ *	      to tell read_inode to read fnode or not.
+ */
+
+struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+	const char *name = dentry->d_name.name;
+	unsigned len = dentry->d_name.len;
+	struct quad_buffer_head qbh;
+	struct hpfs_dirent *de;
+	ino_t ino;
+	int err;
+	struct inode *result = NULL;
+	struct hpfs_inode_info *hpfs_result;
+
+	lock_kernel();
+	if ((err = hpfs_chk_name((char *)name, &len))) {
+		if (err == -ENAMETOOLONG) {
+			unlock_kernel();
+			return ERR_PTR(-ENAMETOOLONG);
+		}
+		goto end_add;
+	}
+
+	/*
+	 * '.' and '..' will never be passed here.
+	 */
+
+	de = map_dirent(dir, hpfs_i(dir)->i_dno, (char *) name, len, NULL, &qbh);
+
+	/*
+	 * This is not really a bailout, just means file not found.
+	 */
+
+	if (!de) goto end;
+
+	/*
+	 * Get inode number, what we're after.
+	 */
+
+	ino = de->fnode;
+
+	/*
+	 * Go find or make an inode.
+	 */
+
+	result = iget_locked(dir->i_sb, ino);
+	if (!result) {
+		hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
+		goto bail1;
+	}
+	if (result->i_state & I_NEW) {
+		hpfs_init_inode(result);
+		if (de->directory)
+			hpfs_read_inode(result);
+		else if (de->ea_size && hpfs_sb(dir->i_sb)->sb_eas)
+			hpfs_read_inode(result);
+		else {
+			result->i_mode |= S_IFREG;
+			result->i_mode &= ~0111;
+			result->i_op = &hpfs_file_iops;
+			result->i_fop = &hpfs_file_ops;
+			result->i_nlink = 1;
+		}
+		unlock_new_inode(result);
+	}
+	hpfs_result = hpfs_i(result);
+	if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;
+
+	hpfs_decide_conv(result, (char *)name, len);
+
+	if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
+		hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures");
+		goto bail1;
+	}
+
+	/*
+	 * Fill in the info from the directory if this is a newly created
+	 * inode.
+	 */
+
+	if (!result->i_ctime.tv_sec) {
+		if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, de->creation_date)))
+			result->i_ctime.tv_sec = 1;
+		result->i_ctime.tv_nsec = 0;
+		result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, de->write_date);
+		result->i_mtime.tv_nsec = 0;
+		result->i_atime.tv_sec = local_to_gmt(dir->i_sb, de->read_date);
+		result->i_atime.tv_nsec = 0;
+		hpfs_result->i_ea_size = de->ea_size;
+		if (!hpfs_result->i_ea_mode && de->read_only)
+			result->i_mode &= ~0222;
+		if (!de->directory) {
+			if (result->i_size == -1) {
+				result->i_size = de->file_size;
+				result->i_data.a_ops = &hpfs_aops;
+				hpfs_i(result)->mmu_private = result->i_size;
+			/*
+			 * i_blocks should count the fnode and any anodes.
+			 * We count 1 for the fnode and don't bother about
+			 * anodes -- the disk heads are on the directory band
+			 * and we want them to stay there.
+			 */
+				result->i_blocks = 1 + ((result->i_size + 511) >> 9);
+			}
+		}
+	}
+
+	hpfs_brelse4(&qbh);
+
+	/*
+	 * Made it.
+	 */
+
+	end:
+	end_add:
+	hpfs_set_dentry_operations(dentry);
+	unlock_kernel();
+	d_add(dentry, result);
+	return NULL;
+
+	/*
+	 * Didn't.
+	 */
+	bail1:
+	
+	hpfs_brelse4(&qbh);
+	
+	/*bail:*/
+
+	unlock_kernel();
+	return ERR_PTR(-ENOENT);
+}
+
+struct file_operations hpfs_dir_ops =
+{
+	.llseek		= hpfs_dir_lseek,
+	.read		= generic_read_dir,
+	.readdir	= hpfs_readdir,
+	.release	= hpfs_dir_release,
+	.fsync		= hpfs_file_fsync,
+};