path: root/fs/ufs/super.c

/*
 *  linux/fs/ufs/super.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <daniel.pirkl@email.cz>
 * Charles University, Faculty of Mathematics and Physics
 */

/* Derived from
 *
 *  linux/fs/ext2/super.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/inode.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */
 
/*
 * Inspired by
 *
 *  linux/fs/ufs/super.c
 *
 * Copyright (C) 1996
 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
 * Laboratory for Computer Science Research Computing Facility
 * Rutgers, The State University of New Jersey
 *
 * Copyright (C) 1996  Eddie C. Dost  (ecd@skynet.be)
 *
 * Kernel module support added on 96/04/26 by
 * Stefan Reinauer <stepan@home.culture.mipt.ru>
 *
 * Module usage counts added on 96/04/29 by
 * Gertjan van Wingerde <gwingerde@gmail.com>
 *
 * Clean swab support on 19970406 by
 * Francois-Rene Rideau <fare@tunes.org>
 *
 * 4.4BSD (FreeBSD) support added on February 1st 1998 by
 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based
 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>.
 *
 * NeXTstep support added on February 5th 1998 by
 * Niels Kristian Bech Jensen <nkbj@image.dk>.
 *
 * write support Daniel Pirkl <daniel.pirkl@email.cz> 1998
 * 
 * HP/UX hfs filesystem support added by
 * Martin K. Petersen <mkp@mkp.net>, August 1999
 *
 * UFS2 (of FreeBSD 5.x) support added by
 * Niraj Kumar <niraj17@iitbombay.org>, Jan 2004
 *
 * UFS2 write support added by
 * Evgeniy Dushistov <dushistov@mail.ru>, 2007
 */

#include <linux/exportfs.h>
#include <linux/module.h>
#include <linux/bitops.h>

#include <stdarg.h>

#include <asm/uaccess.h>

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include <linux/init.h>
#include <linux/parser.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <linux/log2.h>
#include <linux/mount.h>
#include <linux/seq_file.h>

#include "ufs_fs.h"
#include "ufs.h"
#include "swab.h"
#include "util.h"

static struct inode *ufs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
{
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	struct inode *inode;

	if (ino < UFS_ROOTINO || ino > uspi->s_ncg * uspi->s_ipg)
		return ERR_PTR(-ESTALE);

	inode = ufs_iget(sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (generation && inode->i_generation != generation) {
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
	return inode;
}

static struct dentry *ufs_fh_to_dentry(struct super_block *sb, struct fid *fid,
				       int fh_len, int fh_type)
{
	return generic_fh_to_dentry(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
}

static struct dentry *ufs_fh_to_parent(struct super_block *sb, struct fid *fid,
				       int fh_len, int fh_type)
{
	return generic_fh_to_parent(sb, fid, fh_len, fh_type, ufs_nfs_get_inode);
}

static struct dentry *ufs_get_parent(struct dentry *child)
{
	struct qstr dot_dot = QSTR_INIT("..", 2);
	ino_t ino;

	ino = ufs_inode_by_name(d_inode(child), &dot_dot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(ufs_iget(child->d_sb, ino));
}

static const struct export_operations ufs_export_ops = {
	.fh_to_dentry	= ufs_fh_to_dentry,
	.fh_to_parent	= ufs_fh_to_parent,
	.get_parent	= ufs_get_parent,
};

#ifdef CONFIG_UFS_DEBUG
/*
 * Print contents of ufs_super_block, useful for debugging
 */
static void ufs_print_super_stuff(struct super_block *sb,
				  struct ufs_super_block_first *usb1,
				  struct ufs_super_block_second *usb2,
				  struct ufs_super_block_third *usb3)
{
	u32 magic = fs32_to_cpu(sb, usb3->fs_magic);

	pr_debug("ufs_print_super_stuff\n");
	pr_debug("  magic:     0x%x\n", magic);
	if (fs32_to_cpu(sb, usb3->fs_magic) == UFS2_MAGIC) {
		pr_debug("  fs_size:   %llu\n", (unsigned long long)
			 fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_size));
		pr_debug("  fs_dsize:  %llu\n", (unsigned long long)
			 fs64_to_cpu(sb, usb3->fs_un1.fs_u2.fs_dsize));
		pr_debug("  bsize:         %u\n",
			 fs32_to_cpu(sb, usb1->fs_bsize));
		pr_debug("  fsize:         %u\n",
			 fs32_to_cpu(sb, usb1->fs_fsize));
		pr_debug("  fs_volname:  %s\n", usb2->fs_un.fs_u2.fs_volname);
		pr_debug("  fs_sblockloc: %llu\n", (unsigned long long)
			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.fs_sblockloc));
		pr_debug("  cs_ndir(No of dirs):  %llu\n", (unsigned long long)
			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_ndir));
		pr_debug("  cs_nbfree(No of free blocks):  %llu\n",
			 (unsigned long long)
			 fs64_to_cpu(sb, usb2->fs_un.fs_u2.cs_nbfree));
		pr_info("  cs_nifree(Num of free inodes): %llu\n",
			(unsigned long long)
			fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nifree));
		pr_info("  cs_nffree(Num of free frags): %llu\n",
			(unsigned long long)
			fs64_to_cpu(sb, usb3->fs_un1.fs_u2.cs_nffree));
		pr_info("  fs_maxsymlinklen: %u\n",
			fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen));
	} else {
		pr_debug(" sblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_sblkno));
		pr_debug(" cblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_cblkno));
		pr_debug(" iblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_iblkno));
		pr_debug(" dblkno:      %u\n", fs32_to_cpu(sb, usb1->fs_dblkno));
		pr_debug(" cgoffset:    %u\n",
			 fs32_to_cpu(sb, usb1->fs_cgoffset));
		pr_debug(" ~cgmask:     0x%x\n",
			 ~fs32_to_cpu(sb, usb1->fs_cgmask));
		pr_debug(" size:        %u\n", fs32_to_cpu(sb, usb1->fs_size));
		pr_debug(" dsize:       %u\n", fs32_to_cpu(sb, usb1->fs_dsize));
		pr_debug(" ncg:         %u\n", fs32_to_cpu(sb, usb1->fs_ncg));
		pr_debug(" bsize:       %u\n", fs32_to_cpu(sb, usb1->fs_bsize));
		pr_debug(" fsize:       %u\n", fs32_to_cpu(sb, usb1->fs_fsize));
		pr_debug(" frag:        %u\n", fs32_to_cpu(sb, usb1->fs_frag));
		pr_debug(" fragshift:   %u\n",
			 fs32_to_cpu(sb, usb1->fs_fragshift));
		pr_debug(" ~fmask:      %u\n", ~fs32_to_cpu(sb, usb1->fs_fmask));
		pr_debug(" fshift:      %u\n", fs32_to_cpu(sb, usb1->fs_fshift));
		pr_debug(" sbsize:      %u\n", fs32_to_cpu(sb, usb1->fs_sbsize));
		pr_debug(" spc:         %u\n", fs32_to_cpu(sb, usb1->fs_spc));
		pr_debug(" cpg:         %u\n", fs32_to_cpu(sb, usb1->fs_cpg));
		pr_debug(" ipg:         %u\n", fs32_to_cpu(sb, usb1->fs_ipg));
		pr_debug(" fpg:         %u\n", fs32_to_cpu(sb, usb1->fs_fpg));
		pr_debug(" csaddr:      %u\n", fs32_to_cpu(sb, usb1->fs_csaddr));
		pr_debug(" cssize:      %u\n", fs32_to_cpu(sb, usb1->fs_cssize));
		pr_debug(" cgsize:      %u\n", fs32_to_cpu(sb, usb1->fs_cgsize));
		pr_debug(" fstodb:      %u\n",
			 fs32_to_cpu(sb, usb1->fs_fsbtodb));
		pr_debug(" nrpos:       %u\n", fs32_to_cpu(sb, usb3->fs_nrpos));
		pr_debug(" ndir         %u\n",
			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_ndir));
		pr_debug(" nifree       %u\n",
			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nifree));
		pr_debug(" nbfree       %u\n",
			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nbfree));
		pr_debug(" nffree       %u\n",
			 fs32_to_cpu(sb, usb1->fs_cstotal.cs_nffree));
	}
	pr_debug("\n");
}

/*
 * Print contents of ufs_cylinder_group, useful for debugging
 */
static void ufs_print_cylinder_stuff(struct super_block *sb,
				     struct ufs_cylinder_group *cg)
{
	pr_debug("\nufs_print_cylinder_stuff\n");
	pr_debug("size of ucg: %zu\n", sizeof(struct ufs_cylinder_group));
	pr_debug("  magic:        %x\n", fs32_to_cpu(sb, cg->cg_magic));
	pr_debug("  time:         %u\n", fs32_to_cpu(sb, cg->cg_time));
	pr_debug("  cgx:          %u\n", fs32_to_cpu(sb, cg->cg_cgx));
	pr_debug("  ncyl:         %u\n", fs16_to_cpu(sb, cg->cg_ncyl));
	pr_debug("  niblk:        %u\n", fs16_to_cpu(sb, cg->cg_niblk));
	pr_debug("  ndblk:        %u\n", fs32_to_cpu(sb, cg->cg_ndblk));
	pr_debug("  cs_ndir:      %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_ndir));
	pr_debug("  cs_nbfree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nbfree));
	pr_debug("  cs_nifree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nifree));
	pr_debug("  cs_nffree:    %u\n", fs32_to_cpu(sb, cg->cg_cs.cs_nffree));
	pr_debug("  rotor:        %u\n", fs32_to_cpu(sb, cg->cg_rotor));
	pr_debug("  frotor:       %u\n", fs32_to_cpu(sb, cg->cg_frotor));
	pr_debug("  irotor:       %u\n", fs32_to_cpu(sb, cg->cg_irotor));
	pr_debug("  frsum:        %u, %u, %u, %u, %u, %u, %u, %u\n",
	    fs32_to_cpu(sb, cg->cg_frsum[0]), fs32_to_cpu(sb, cg->cg