[net-next-2.6.git] / fs / ufs / truncate.c

/*
 *  linux/fs/ufs/truncate.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <daniel.pirkl@email.cz>
 * Charles University, Faculty of Mathematics and Physics
 *
 *  from
 *
 *  linux/fs/ext2/truncate.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/truncate.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

/*
 * Real random numbers for secure rm added 94/02/18
 * Idea from Pierre del Perugia <delperug@gla.ecoledoc.ibp.fr>
 */

/*
 * Adoptation to use page cache and UFS2 write support by
 * Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007
 */

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/time.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/smp_lock.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/sched.h>

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

/*
 * Secure deletion currently doesn't work. It interacts very badly
 * with buffers shared with memory mappings, and for that reason
 * can't be done in the truncate() routines. It should instead be
 * done separately in "release()" before calling the truncate routines
 * that will release the actual file blocks.
 *
 *		Linus
 */

#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)


static int ufs_trunc_direct(struct inode *inode)
{
	struct ufs_inode_info *ufsi = UFS_I(inode);
	struct super_block * sb;
	struct ufs_sb_private_info * uspi;
	void *p;
	u64 frag1, frag2, frag3, frag4, block1, block2;
	unsigned frag_to_free, free_count;
	unsigned i, tmp;
	int retry;
	
	UFSD("ENTER: ino %lu\n", inode->i_ino);

	sb = inode->i_sb;
	uspi = UFS_SB(sb)->s_uspi;
	
	frag_to_free = 0;
	free_count = 0;
	retry = 0;
	
	frag1 = DIRECT_FRAGMENT;
	frag4 = min_t(u32, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
	frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 | uspi->s_fpbmask) + 1) : frag1);
	frag3 = frag4 & ~uspi->s_fpbmask;
	block1 = block2 = 0;
	if (frag2 > frag3) {
		frag2 = frag4;
		frag3 = frag4 = 0;
	} else if (frag2 < frag3) {
		block1 = ufs_fragstoblks (frag2);
		block2 = ufs_fragstoblks (frag3);
	}

	UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
	     " frag3 %llu, frag4 %llu\n", inode->i_ino,
	     (unsigned long long)frag1, (unsigned long long)frag2,
	     (unsigned long long)block1, (unsigned long long)block2,
	     (unsigned long long)frag3, (unsigned long long)frag4);

	if (frag1 >= frag2)
		goto next1;		

	/*
	 * Free first free fragments
	 */
	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
	tmp = ufs_data_ptr_to_cpu(sb, p);
	if (!tmp )
		ufs_panic (sb, "ufs_trunc_direct", "internal error");
	frag2 -= frag1;
	frag1 = ufs_fragnum (frag1);

	ufs_free_fragments(inode, tmp + frag1, frag2);
	mark_inode_dirty(inode);
	frag_to_free = tmp + frag1;

next1:
	/*
	 * Free whole blocks
	 */
	for (i = block1 ; i < block2; i++) {
		p = ufs_get_direct_data_ptr(uspi, ufsi, i);
		tmp = ufs_data_ptr_to_cpu(sb, p);
		if (!tmp)
			continue;
		ufs_data_ptr_clear(uspi, p);

		if (free_count == 0) {
			frag_to_free = tmp;
			free_count = uspi->s_fpb;
		} else if (free_count > 0 && frag_to_free == tmp - free_count)
			free_count += uspi->s_fpb;
		else {
			ufs_free_blocks (inode, frag_to_free, free_count);
			frag_to_free = tmp;
			free_count = uspi->s_fpb;
		}
		mark_inode_dirty(inode);
	}
	
	if (free_count > 0)
		ufs_free_blocks (inode, frag_to_free, free_count);

	if (frag3 >= frag4)
		goto next3;

	/*
	 * Free last free fragments
	 */
	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
	tmp = ufs_data_ptr_to_cpu(sb, p);
	if (!tmp )
		ufs_panic(sb, "ufs_truncate_direct", "internal error");
	frag4 = ufs_fragnum (frag4);
	ufs_data_ptr_clear(uspi, p);

	ufs_free_fragments (inode, tmp, frag4);
	mark_inode_dirty(inode);
 next3:

	UFSD("EXIT: ino %lu\n", inode->i_ino);
	return retry;
}


static int ufs_trunc_indirect(struct inode *inode, u64 offset, void *p)
{
	struct super_block * sb;
	struct ufs_sb_private_info * uspi;
	struct ufs_buffer_head * ind_ubh;
	void *ind;
	u64 tmp, indirect_block, i, frag_to_free;
	unsigned free_count;
	int retry;

	UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
	     inode->i_ino, (unsigned long long)offset, p);

	BUG_ON(!p);
		
	sb = inode->i_sb;
	uspi = UFS_SB(sb)->s_uspi;

	frag_to_free = 0;
	free_count = 0;
	retry = 0;
	
	tmp = ufs_data_ptr_to_cpu(sb, p);
	if (!tmp)
		return 0;
	ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
		ubh_brelse (ind_ubh);
		return 1;
	}
	if (!ind_ubh) {
		ufs_data_ptr_clear(uspi, p);
		return 0;
	}

	indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
	for (i = indirect_block; i < uspi->s_apb; i++) {
		ind = ubh_get_data_ptr(uspi, ind_ubh, i);
		tmp = ufs_data_ptr_to_cpu(sb, ind);
		if (!tmp)
			continue;

		ufs_data_ptr_clear(uspi, ind);
		ubh_mark_buffer_dirty(ind_ubh);
		if (free_count == 0) {
			frag_to_free = tmp;
			free_count = uspi->s_fpb;
		} else if (free_count > 0 && frag_to_free == tmp - free_count)
			free_count += uspi->s_fpb;
		else {
			ufs_free_blocks (inode, frag_to_free, free_count);
			frag_to_free = tmp;
			free_count = uspi->s_fpb;
		}

		mark_inode_dirty(inode);
	}

	if (free_count > 0) {
		ufs_free_blocks (inode, frag_to_free, free_count);
	}
	for (i = 0; i < uspi->s_apb; i++)
		if (!ufs_is_data_ptr_zero(uspi,
					  ubh_get_data_ptr(uspi, ind_ubh, i)))
			break;
	if (i >= uspi->s_apb) {
		tmp = ufs_data_ptr_to_cpu(sb, p);
		ufs_data_ptr_clear(uspi, p);

		ufs_free_blocks (inode, tmp, uspi->s_fpb);
		mark_inode_dirty(inode);
		ubh_bforget(ind_ubh);
		ind_ubh = NULL;
	}
	if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
		ubh_ll_rw_block(SWRITE, ind_ubh);
		ubh_wait_on_buffer (ind_ubh);
	}
	ubh_brelse (ind_ubh);
	
	UFSD("EXIT: ino %lu\n", inode->i_ino);
	
	return retry;
}

static int ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p)
{
	struct super_block * sb;
	struct ufs_sb_private_info * uspi;
	struct ufs_buffer_head *dind_bh;
	u64 i, tmp, dindirect_block;
	void *dind;
	int retry = 0;
	
	UFSD("ENTER: ino %lu\n", inode->i_ino);
	
	sb = inode->i_sb;
	uspi = UFS_SB(sb)->s_uspi;

	dindirect_block = (DIRECT_BLOCK > offset) 
		? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
	retry = 0;
	
	tmp = ufs_data_ptr_to_cpu(sb, p);
	if (!tmp)
		return 0;
	dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
		ubh_brelse (dind_bh);
		return 1;
	}
	if (!dind_bh) {
		ufs_data_ptr_clear(uspi, p);
		return 0;
	}

	for (i = dindirect_block ; i < uspi->s_apb ; i++) {
		dind = ubh_get_data_ptr(uspi, dind_bh, i);
		tmp = ufs_data_ptr_to_cpu(sb, dind);
		if (!tmp)
			continue;
		retry |= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
		ubh_mark_buffer_dirty(dind_bh);
	}

	for (i = 0; i < uspi->s_apb; i++)
		if (!ufs_is_data_ptr_zero(uspi,
					  ubh_get_data_ptr(uspi, dind_bh, i)))
			break;
	if (i >= uspi->s_apb) {
		tmp = ufs_data_ptr_to_cpu(sb, p);
		ufs_data_ptr_clear(uspi, p);

		ufs_free_blocks(inode, tmp, uspi->s_fpb);
		mark_inode_dirty(inode);
		ubh_bforget(dind_bh);
		dind_bh = NULL;
	}
	if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
		ubh_ll_rw_block(SWRITE, dind_bh);
		ubh_wait_on_buffer (dind_bh);
	}
	ubh_brelse (dind_bh);
	
	UFSD("EXIT: ino %lu\n", inode->i_ino);
	
	return retry;
}

static int ufs_trunc_tindirect(struct inode *inode)
{
	struct super_block *sb = inode->i_sb;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	struct ufs_inode_info *ufsi = UFS_I(inode);
	struct ufs_buffer_head * tind_bh;
	u64 tindirect_block, tmp, i;
	void *tind, *p;
	int retry;
	
	UFSD("ENTER: ino %lu\n", inode->i_ino);

	retry = 0;
	
	tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
		? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;

	p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
	if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
		return 0;
	tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
		ubh_brelse (tind_bh);
		return 1;
	}
	if (!tind_bh) {
		ufs_data_ptr_clear(uspi, p);
		return 0;
	}

	for (i = tindirect_block ; i < uspi->s_apb ; i++) {
		tind = ubh_get_data_ptr(uspi, tind_bh, i);
		retry |= ufs_trunc_dindirect(inode, UFS_NDADDR + 
			uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
		ubh_mark_buffer_dirty(tind_bh);
	}
	for (i = 0; i < uspi->s_apb; i++)
		if (!ufs_is_data_ptr_zero(uspi,
					  ubh_get_data_ptr(uspi, tind_bh, i)))
			break;
	if (i >= uspi->s_apb) {
		tmp = ufs_data_ptr_to_cpu(sb, p);
		ufs_data_ptr_clear(uspi, p);

		ufs_free_blocks(inode, tmp, uspi->s_fpb);
		mark_inode_dirty(inode);
		ubh_bforget(tind_bh);
		tind_bh = NULL;
	}
	if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
		ubh_ll_rw_block(SWRITE, tind_bh);
		ubh_wait_on_buffer (tind_bh);
	}
	ubh_brelse (tind_bh);
	
	UFSD("EXIT: ino %lu\n", inode->i_ino);
	return retry;
}

static int ufs_alloc_lastblock(struct inode *inode)
{
	int err = 0;
	struct super_block *sb = inode->i_sb;
	struct address_space *mapping = inode->i_mapping;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	unsigned i, end;
	sector_t lastfrag;
	struct page *lastpage;
	struct buffer_head *bh;
	u64 phys64;

	lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;

	if (!lastfrag)
		goto out;

	lastfrag--;

	lastpage = ufs_get_locked_page(mapping, lastfrag >>
				       (PAGE_CACHE_SHIFT - inode->i_blkbits));
       if (IS_ERR(lastpage)) {
               err = -EIO;
               goto out;
       }

       end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
       bh = page_buffers(lastpage);
       for (i = 0; i < end; ++i)
               bh = bh->b_this_page;


       err = ufs_getfrag_block(inode, lastfrag, bh, 1);

       if (unlikely(err))
	       goto out_unlock;

       if (buffer_new(bh)) {
	       clear_buffer_new(bh);
	       unmap_underlying_metadata(bh->b_bdev,
					 bh->b_blocknr);
	       /*
		* we do not zeroize fragment, because of
		* if it maped to hole, it already contains zeroes
		*/
	       set_buffer_uptodate(bh);
	       mark_buffer_dirty(bh);
	       set_page_dirty(lastpage);
       }

       if (lastfrag >= UFS_IND_FRAGMENT) {
	       end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
	       phys64 = bh->b_blocknr + 1;
	       for (i = 0; i < end; ++i) {
		       bh = sb_getblk(sb, i + phys64);
		       lock_buffer(bh);
		       memset(bh->b_data, 0, sb->s_blocksize);
		       set_buffer_uptodate(bh);
		       mark_buffer_dirty(bh);
		       unlock_buffer(bh);
		       sync_dirty_buffer(bh);
		       brelse(bh);
	       }
       }
out_unlock:
       ufs_put_locked_page(lastpage);
out:
       return err;
}

int ufs_truncate(struct inode *inode, loff_t old_i_size)
{
	struct ufs_inode_info *ufsi = UFS_I(inode);
	struct super_block *sb = inode->i_sb;
	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	int retry, err = 0;
	
	UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
	     inode->i_ino, (unsigned long long)i_size_read(inode),
	     (unsigned long long)old_i_size);

	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
	      S_ISLNK(inode->i_mode)))
		return -EINVAL;
	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
		return -EPERM;

	err = ufs_alloc_lastblock(inode);

	if (err) {
		i_size_write(inode, old_i_size);
		goto out;
	}

	block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);

	lock_kernel();
	while (1) {
		retry = ufs_trunc_direct(inode);
		retry |= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
					    ufs_get_direct_data_ptr(uspi, ufsi,
								    UFS_IND_BLOCK));
		retry |= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
					     ufs_get_direct_data_ptr(uspi, ufsi,
								     UFS_DIND_BLOCK));
		retry |= ufs_trunc_tindirect (inode);
		if (!retry)
			break;
		if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
			ufs_sync_inode (inode);
		blk_run_address_space(inode->i_mapping);
		yield();
	}

	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
	ufsi->i_lastfrag = DIRECT_FRAGMENT;
	unlock_kernel();
	mark_inode_dirty(inode);
out:
	UFSD("EXIT: err %d\n", err);
	return err;
}

/*
 * TODO:
 *	- truncate case should use proper ordering instead of using
 *	  simple_setsize
 */
int ufs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	unsigned int ia_valid = attr->ia_valid;
	int error;

	error = inode_change_ok(inode, attr);
	if (error)
		return error;

	if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
		loff_t old_i_size = inode->i_size;

		error = simple_setsize(inode, attr->ia_size);
		if (error)
			return error;
		error = ufs_truncate(inode, old_i_size);
		if (error)
			return error;
	}
	return inode_setattr(inode, attr);
}

const struct inode_operations ufs_file_inode_operations = {
	.setattr = ufs_setattr,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ufs/truncate.c
	3	*
	4	* Copyright (C) 1998
	5	* Daniel Pirkl <daniel.pirkl@email.cz>
	6	* Charles University, Faculty of Mathematics and Physics
	7	*
	8	* from
	9	*
	10	* linux/fs/ext2/truncate.c
	11	*
	12	* Copyright (C) 1992, 1993, 1994, 1995
	13	* Remy Card (card@masi.ibp.fr)
	14	* Laboratoire MASI - Institut Blaise Pascal
	15	* Universite Pierre et Marie Curie (Paris VI)
	16	*
	17	* from
	18	*
	19	* linux/fs/minix/truncate.c
	20	*
	21	* Copyright (C) 1991, 1992 Linus Torvalds
	22	*
	23	* Big-endian to little-endian byte-swapping/bitmaps by
	24	* David S. Miller (davem@caip.rutgers.edu), 1995
	25	*/
	26
	27	/*
	28	* Real random numbers for secure rm added 94/02/18
	29	* Idea from Pierre del Perugia <delperug@gla.ecoledoc.ibp.fr>
	30	*/
	31
09114eb8	32	/*
54fb996a ED	33	* Adoptation to use page cache and UFS2 write support by
54fb996a ED	34	* Evgeniy Dushistov <dushistov@mail.ru>, 2006-2007
09114eb8 ED	35	*/
09114eb8 ED	36
1da177e4 LT	37	#include <linux/errno.h>
1da177e4 LT	38	#include <linux/fs.h>
1da177e4 LT	39	#include <linux/fcntl.h>
	40	#include <linux/time.h>
	41	#include <linux/stat.h>
	42	#include <linux/string.h>
	43	#include <linux/smp_lock.h>
	44	#include <linux/buffer_head.h>
	45	#include <linux/blkdev.h>
	46	#include <linux/sched.h>
	47
e5420598	48	#include "ufs_fs.h"
bcd6d4ec	49	#include "ufs.h"
1da177e4 LT	50	#include "swab.h"
	51	#include "util.h"
	52
1da177e4 LT	53	/*
	54	* Secure deletion currently doesn't work. It interacts very badly
	55	* with buffers shared with memory mappings, and for that reason
	56	* can't be done in the truncate() routines. It should instead be
	57	* done separately in "release()" before calling the truncate routines
	58	* that will release the actual file blocks.
	59	*
	60	* Linus
	61	*/
	62
	63	#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
	64	#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
	65
1da177e4	66
54fb996a	67	static int ufs_trunc_direct(struct inode *inode)
1da177e4 LT	68	{
	69	struct ufs_inode_info *ufsi = UFS_I(inode);
	70	struct super_block * sb;
	71	struct ufs_sb_private_info * uspi;
54fb996a ED	72	void *p;
54fb996a ED	73	u64 frag1, frag2, frag3, frag4, block1, block2;
1da177e4	74	unsigned frag_to_free, free_count;
09114eb8	75	unsigned i, tmp;
1da177e4 LT	76	int retry;
1da177e4 LT	77
4b25a37e	78	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4 LT	79
	80	sb = inode->i_sb;
	81	uspi = UFS_SB(sb)->s_uspi;
	82
	83	frag_to_free = 0;
	84	free_count = 0;
	85	retry = 0;
	86
	87	frag1 = DIRECT_FRAGMENT;
	88	frag4 = min_t(u32, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
	89	frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 \| uspi->s_fpbmask) + 1) : frag1);
	90	frag3 = frag4 & ~uspi->s_fpbmask;
	91	block1 = block2 = 0;
	92	if (frag2 > frag3) {
	93	frag2 = frag4;
	94	frag3 = frag4 = 0;
54fb996a	95	} else if (frag2 < frag3) {
1da177e4 LT	96	block1 = ufs_fragstoblks (frag2);
	97	block2 = ufs_fragstoblks (frag3);
	98	}
	99
4b25a37e ED	100	UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
4b25a37e ED	101	" frag3 %llu, frag4 %llu\n", inode->i_ino,
54fb996a ED	102	(unsigned long long)frag1, (unsigned long long)frag2,
	103	(unsigned long long)block1, (unsigned long long)block2,
	104	(unsigned long long)frag3, (unsigned long long)frag4);
1da177e4 LT	105
	106	if (frag1 >= frag2)
	107	goto next1;
	108
	109	/*
	110	* Free first free fragments
	111	*/
54fb996a ED	112	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
54fb996a ED	113	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	114	if (!tmp )
1da177e4 LT	115	ufs_panic (sb, "ufs_trunc_direct", "internal error");
8682164a	116	frag2 -= frag1;
1da177e4	117	frag1 = ufs_fragnum (frag1);
09114eb8	118
8682164a	119	ufs_free_fragments(inode, tmp + frag1, frag2);
50aa4eb0	120	mark_inode_dirty(inode);
1da177e4 LT	121	frag_to_free = tmp + frag1;
	122
	123	next1:
	124	/*
	125	* Free whole blocks
	126	*/
	127	for (i = block1 ; i < block2; i++) {
54fb996a ED	128	p = ufs_get_direct_data_ptr(uspi, ufsi, i);
54fb996a ED	129	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	130	if (!tmp)
1da177e4 LT	131	continue;
54fb996a	132	ufs_data_ptr_clear(uspi, p);
50aa4eb0	133
1da177e4 LT	134	if (free_count == 0) {
	135	frag_to_free = tmp;
	136	free_count = uspi->s_fpb;
	137	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	138	free_count += uspi->s_fpb;
	139	else {
	140	ufs_free_blocks (inode, frag_to_free, free_count);
	141	frag_to_free = tmp;
	142	free_count = uspi->s_fpb;
	143	}
50aa4eb0	144	mark_inode_dirty(inode);
1da177e4 LT	145	}
	146
	147	if (free_count > 0)
	148	ufs_free_blocks (inode, frag_to_free, free_count);
	149
	150	if (frag3 >= frag4)
	151	goto next3;
	152
	153	/*
	154	* Free last free fragments
	155	*/
54fb996a ED	156	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
54fb996a ED	157	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	158	if (!tmp )
	159	ufs_panic(sb, "ufs_truncate_direct", "internal error");
	160	frag4 = ufs_fragnum (frag4);
54fb996a	161	ufs_data_ptr_clear(uspi, p);
50aa4eb0	162
1da177e4	163	ufs_free_fragments (inode, tmp, frag4);
50aa4eb0	164	mark_inode_dirty(inode);
1da177e4 LT	165	next3:
1da177e4 LT	166
4b25a37e	167	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	168	return retry;
	169	}
	170
	171
54fb996a	172	static int ufs_trunc_indirect(struct inode inode, u64 offset, void p)
1da177e4 LT	173	{
	174	struct super_block * sb;
	175	struct ufs_sb_private_info * uspi;
	176	struct ufs_buffer_head * ind_ubh;
54fb996a ED	177	void *ind;
	178	u64 tmp, indirect_block, i, frag_to_free;
	179	unsigned free_count;
1da177e4 LT	180	int retry;
1da177e4 LT	181
54fb996a ED	182	UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
	183	inode->i_ino, (unsigned long long)offset, p);
	184
	185	BUG_ON(!p);
1da177e4 LT	186
	187	sb = inode->i_sb;
	188	uspi = UFS_SB(sb)->s_uspi;
	189
	190	frag_to_free = 0;
	191	free_count = 0;
	192	retry = 0;
	193
54fb996a	194	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	195	if (!tmp)
	196	return 0;
	197	ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
54fb996a	198	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	199	ubh_brelse (ind_ubh);
	200	return 1;
	201	}
	202	if (!ind_ubh) {
54fb996a	203	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	204	return 0;
	205	}
	206
	207	indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
	208	for (i = indirect_block; i < uspi->s_apb; i++) {
54fb996a ED	209	ind = ubh_get_data_ptr(uspi, ind_ubh, i);
54fb996a ED	210	tmp = ufs_data_ptr_to_cpu(sb, ind);
1da177e4 LT	211	if (!tmp)
1da177e4 LT	212	continue;
09114eb8	213
54fb996a	214	ufs_data_ptr_clear(uspi, ind);
1da177e4 LT	215	ubh_mark_buffer_dirty(ind_ubh);
	216	if (free_count == 0) {
	217	frag_to_free = tmp;
	218	free_count = uspi->s_fpb;
	219	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	220	free_count += uspi->s_fpb;
	221	else {
	222	ufs_free_blocks (inode, frag_to_free, free_count);
	223	frag_to_free = tmp;
	224	free_count = uspi->s_fpb;
	225	}
50aa4eb0	226
1da177e4	227	mark_inode_dirty(inode);
1da177e4 LT	228	}
	229
	230	if (free_count > 0) {
	231	ufs_free_blocks (inode, frag_to_free, free_count);
	232	}
	233	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	234	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	235	ubh_get_data_ptr(uspi, ind_ubh, i)))
1da177e4 LT	236	break;
1da177e4 LT	237	if (i >= uspi->s_apb) {
54fb996a ED	238	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	239	ufs_data_ptr_clear(uspi, p);
50aa4eb0	240
2061df0f	241	ufs_free_blocks (inode, tmp, uspi->s_fpb);
50aa4eb0	242	mark_inode_dirty(inode);
2061df0f ED	243	ubh_bforget(ind_ubh);
2061df0f ED	244	ind_ubh = NULL;
1da177e4 LT	245	}
1da177e4 LT	246	if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
098d5af7	247	ubh_ll_rw_block(SWRITE, ind_ubh);
1da177e4 LT	248	ubh_wait_on_buffer (ind_ubh);
	249	}
	250	ubh_brelse (ind_ubh);
	251
4b25a37e	252	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	253
	254	return retry;
	255	}
	256
54fb996a	257	static int ufs_trunc_dindirect(struct inode inode, u64 offset, void p)
1da177e4 LT	258	{
	259	struct super_block * sb;
	260	struct ufs_sb_private_info * uspi;
54fb996a ED	261	struct ufs_buffer_head *dind_bh;
	262	u64 i, tmp, dindirect_block;
	263	void *dind;
1da177e4 LT	264	int retry = 0;
1da177e4 LT	265
4b25a37e	266	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4 LT	267
	268	sb = inode->i_sb;
	269	uspi = UFS_SB(sb)->s_uspi;
	270
	271	dindirect_block = (DIRECT_BLOCK > offset)
	272	? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
	273	retry = 0;
	274
54fb996a	275	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	276	if (!tmp)
	277	return 0;
	278	dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
54fb996a	279	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	280	ubh_brelse (dind_bh);
	281	return 1;
	282	}
	283	if (!dind_bh) {
54fb996a	284	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	285	return 0;
	286	}
	287
	288	for (i = dindirect_block ; i < uspi->s_apb ; i++) {
54fb996a ED	289	dind = ubh_get_data_ptr(uspi, dind_bh, i);
54fb996a ED	290	tmp = ufs_data_ptr_to_cpu(sb, dind);
1da177e4 LT	291	if (!tmp)
	292	continue;
	293	retry \|= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
	294	ubh_mark_buffer_dirty(dind_bh);
	295	}
	296
	297	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	298	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	299	ubh_get_data_ptr(uspi, dind_bh, i)))
1da177e4 LT	300	break;
1da177e4 LT	301	if (i >= uspi->s_apb) {
54fb996a ED	302	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	303	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	304
50aa4eb0 ED	305	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	306	mark_inode_dirty(inode);
2061df0f ED	307	ubh_bforget(dind_bh);
2061df0f ED	308	dind_bh = NULL;
1da177e4 LT	309	}
1da177e4 LT	310	if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
098d5af7	311	ubh_ll_rw_block(SWRITE, dind_bh);
1da177e4 LT	312	ubh_wait_on_buffer (dind_bh);
	313	}
	314	ubh_brelse (dind_bh);
	315
4b25a37e	316	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	317
	318	return retry;
	319	}
	320
54fb996a	321	static int ufs_trunc_tindirect(struct inode *inode)
1da177e4	322	{
54fb996a ED	323	struct super_block *sb = inode->i_sb;
54fb996a ED	324	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1da177e4	325	struct ufs_inode_info *ufsi = UFS_I(inode);
1da177e4	326	struct ufs_buffer_head * tind_bh;
54fb996a ED	327	u64 tindirect_block, tmp, i;
54fb996a ED	328	void tind, p;
1da177e4 LT	329	int retry;
1da177e4 LT	330
4b25a37e	331	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4	332
1da177e4 LT	333	retry = 0;
	334
	335	tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
	336	? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
54fb996a ED	337
	338	p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
	339	if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
1da177e4 LT	340	return 0;
1da177e4 LT	341	tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
54fb996a	342	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	343	ubh_brelse (tind_bh);
	344	return 1;
	345	}
	346	if (!tind_bh) {
54fb996a	347	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	348	return 0;
	349	}
	350
	351	for (i = tindirect_block ; i < uspi->s_apb ; i++) {
0465fc0a	352	tind = ubh_get_data_ptr(uspi, tind_bh, i);
1da177e4 LT	353	retry \|= ufs_trunc_dindirect(inode, UFS_NDADDR +
	354	uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
	355	ubh_mark_buffer_dirty(tind_bh);
	356	}
	357	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	358	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	359	ubh_get_data_ptr(uspi, tind_bh, i)))
1da177e4 LT	360	break;
1da177e4 LT	361	if (i >= uspi->s_apb) {
54fb996a ED	362	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	363	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	364
50aa4eb0 ED	365	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	366	mark_inode_dirty(inode);
2061df0f ED	367	ubh_bforget(tind_bh);
2061df0f ED	368	tind_bh = NULL;
1da177e4 LT	369	}
1da177e4 LT	370	if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
098d5af7	371	ubh_ll_rw_block(SWRITE, tind_bh);
1da177e4 LT	372	ubh_wait_on_buffer (tind_bh);
	373	}
	374	ubh_brelse (tind_bh);
	375
4b25a37e	376	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	377	return retry;
1da177e4 LT	378	}
10e5dce0 ED	379
10e5dce0 ED	380	static int ufs_alloc_lastblock(struct inode *inode)
1da177e4	381	{
10e5dce0	382	int err = 0;
4b25a37e	383	struct super_block *sb = inode->i_sb;
10e5dce0	384	struct address_space *mapping = inode->i_mapping;
4b25a37e	385	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
54fb996a ED	386	unsigned i, end;
54fb996a ED	387	sector_t lastfrag;
10e5dce0 ED	388	struct page *lastpage;
10e5dce0 ED	389	struct buffer_head *bh;
4b25a37e	390	u64 phys64;
10e5dce0 ED	391
	392	lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
	393
ecdc6394	394	if (!lastfrag)
10e5dce0	395	goto out;
ecdc6394	396
10e5dce0 ED	397	lastfrag--;
	398
	399	lastpage = ufs_get_locked_page(mapping, lastfrag >>
	400	(PAGE_CACHE_SHIFT - inode->i_blkbits));
	401	if (IS_ERR(lastpage)) {
	402	err = -EIO;
	403	goto out;
	404	}
	405
	406	end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
	407	bh = page_buffers(lastpage);
	408	for (i = 0; i < end; ++i)
	409	bh = bh->b_this_page;
	410
ecdc6394 ED	411
	412	err = ufs_getfrag_block(inode, lastfrag, bh, 1);
	413
	414	if (unlikely(err))
	415	goto out_unlock;
	416
	417	if (buffer_new(bh)) {
	418	clear_buffer_new(bh);
	419	unmap_underlying_metadata(bh->b_bdev,
	420	bh->b_blocknr);
	421	/*
	422	* we do not zeroize fragment, because of
	423	* if it maped to hole, it already contains zeroes
	424	*/
	425	set_buffer_uptodate(bh);
	426	mark_buffer_dirty(bh);
	427	set_page_dirty(lastpage);
10e5dce0	428	}
ecdc6394	429
4b25a37e ED	430	if (lastfrag >= UFS_IND_FRAGMENT) {
	431	end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
	432	phys64 = bh->b_blocknr + 1;
	433	for (i = 0; i < end; ++i) {
	434	bh = sb_getblk(sb, i + phys64);
	435	lock_buffer(bh);
	436	memset(bh->b_data, 0, sb->s_blocksize);
	437	set_buffer_uptodate(bh);
	438	mark_buffer_dirty(bh);
	439	unlock_buffer(bh);
	440	sync_dirty_buffer(bh);
	441	brelse(bh);
	442	}
	443	}
10e5dce0 ED	444	out_unlock:
	445	ufs_put_locked_page(lastpage);
	446	out:
	447	return err;
	448	}
	449
	450	int ufs_truncate(struct inode *inode, loff_t old_i_size)
	451	{
	452	struct ufs_inode_info *ufsi = UFS_I(inode);
	453	struct super_block *sb = inode->i_sb;
	454	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	455	int retry, err = 0;
1da177e4	456
54fb996a ED	457	UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
	458	inode->i_ino, (unsigned long long)i_size_read(inode),
	459	(unsigned long long)old_i_size);
1da177e4	460
10e5dce0 ED	461	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	462	S_ISLNK(inode->i_mode)))
	463	return -EINVAL;
1da177e4	464	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
10e5dce0 ED	465	return -EPERM;
10e5dce0 ED	466
ecdc6394	467	err = ufs_alloc_lastblock(inode);
10e5dce0	468
ecdc6394 ED	469	if (err) {
	470	i_size_write(inode, old_i_size);
	471	goto out;
10e5dce0	472	}
09114eb8	473
10e5dce0	474	block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
09114eb8	475
1da177e4 LT	476	lock_kernel();
	477	while (1) {
	478	retry = ufs_trunc_direct(inode);
54fb996a ED	479	retry \|= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
	480	ufs_get_direct_data_ptr(uspi, ufsi,
	481	UFS_IND_BLOCK));
	482	retry \|= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
	483	ufs_get_direct_data_ptr(uspi, ufsi,
	484	UFS_DIND_BLOCK));
1da177e4 LT	485	retry \|= ufs_trunc_tindirect (inode);
	486	if (!retry)
	487	break;
	488	if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
	489	ufs_sync_inode (inode);
	490	blk_run_address_space(inode->i_mapping);
	491	yield();
	492	}
09114eb8	493
1da177e4	494	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
ecdc6394	495	ufsi->i_lastfrag = DIRECT_FRAGMENT;
1da177e4 LT	496	unlock_kernel();
1da177e4 LT	497	mark_inode_dirty(inode);
10e5dce0 ED	498	out:
	499	UFSD("EXIT: err %d\n", err);
	500	return err;
1da177e4	501	}
10e5dce0	502
10e5dce0	503	/*
15c6fd97	504	* TODO:
	505	* - truncate case should use proper ordering instead of using
	506	* simple_setsize
10e5dce0	507	*/
311b9549	508	int ufs_setattr(struct dentry dentry, struct iattr attr)
10e5dce0 ED	509	{
	510	struct inode *inode = dentry->d_inode;
	511	unsigned int ia_valid = attr->ia_valid;
	512	int error;
	513
	514	error = inode_change_ok(inode, attr);
	515	if (error)
	516	return error;
	517
12755627	518	if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
10e5dce0	519	loff_t old_i_size = inode->i_size;
907f4554	520
15c6fd97	521	error = simple_setsize(inode, attr->ia_size);
10e5dce0 ED	522	if (error)
	523	return error;
	524	error = ufs_truncate(inode, old_i_size);
	525	if (error)
	526	return error;
	527	}
	528	return inode_setattr(inode, attr);
	529	}
	530
c5ef1c42	531	const struct inode_operations ufs_file_inode_operations = {
10e5dce0 ED	532	.setattr = ufs_setattr,
10e5dce0 ED	533	};