[linux.git] / fs / ufs / truncate.c

/*
 *  linux/fs/ufs/truncate.c
 *
 * Copyright (C) 1998
 * Daniel Pirkl <[email protected]>
 * Charles University, Faculty of Mathematics and Physics
 *
 *  from
 *
 *  linux/fs/ext2/truncate.c
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([email protected])
 * 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 ([email protected]), 1995
 */

/*
 * Real random numbers for secure rm added 94/02/18
 * Idea from Pierre del Perugia <[email protected]>
 */

/*
 * Adoptation to use page cache and UFS2 write support by
 * Evgeniy Dushistov <[email protected]>, 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/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(u64, 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_sync_block(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_sync_block(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_sync_block(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);

	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);
		yield();
	}

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

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;

		/* XXX(truncate): truncate_setsize should be called last */
		truncate_setsize(inode, attr->ia_size);

		lock_ufs(inode->i_sb);
		error = ufs_truncate(inode, old_i_size);
		unlock_ufs(inode->i_sb);
		if (error)
			return error;
	}

	setattr_copy(inode, attr);
	mark_inode_dirty(inode);
	return 0;
}

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 <[email protected]>
	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 ([email protected])
	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 ([email protected]), 1995
	25	*/
	26
	27	/*
	28	* Real random numbers for secure rm added 94/02/18
	29	* Idea from Pierre del Perugia <[email protected]>
	30	*/
	31
09114eb8	32	/*
54fb996a ED	33	* Adoptation to use page cache and UFS2 write support by
54fb996a ED	34	* Evgeniy Dushistov <[email protected]>, 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>
1da177e4 LT	43	#include <linux/buffer_head.h>
	44	#include <linux/blkdev.h>
	45	#include <linux/sched.h>
	46
e5420598	47	#include "ufs_fs.h"
bcd6d4ec	48	#include "ufs.h"
1da177e4 LT	49	#include "swab.h"
	50	#include "util.h"
	51
1da177e4 LT	52	/*
	53	* Secure deletion currently doesn't work. It interacts very badly
	54	* with buffers shared with memory mappings, and for that reason
	55	* can't be done in the truncate() routines. It should instead be
	56	* done separately in "release()" before calling the truncate routines
	57	* that will release the actual file blocks.
	58	*
	59	* Linus
	60	*/
	61
	62	#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
	63	#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
	64
1da177e4	65
54fb996a	66	static int ufs_trunc_direct(struct inode *inode)
1da177e4 LT	67	{
	68	struct ufs_inode_info *ufsi = UFS_I(inode);
	69	struct super_block * sb;
	70	struct ufs_sb_private_info * uspi;
54fb996a ED	71	void *p;
54fb996a ED	72	u64 frag1, frag2, frag3, frag4, block1, block2;
1da177e4	73	unsigned frag_to_free, free_count;
09114eb8	74	unsigned i, tmp;
1da177e4 LT	75	int retry;
1da177e4 LT	76
4b25a37e	77	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4 LT	78
	79	sb = inode->i_sb;
	80	uspi = UFS_SB(sb)->s_uspi;
	81
	82	frag_to_free = 0;
	83	free_count = 0;
	84	retry = 0;
	85
	86	frag1 = DIRECT_FRAGMENT;
1d582723	87	frag4 = min_t(u64, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
1da177e4 LT	88	frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 \| uspi->s_fpbmask) + 1) : frag1);
	89	frag3 = frag4 & ~uspi->s_fpbmask;
	90	block1 = block2 = 0;
	91	if (frag2 > frag3) {
	92	frag2 = frag4;
	93	frag3 = frag4 = 0;
54fb996a	94	} else if (frag2 < frag3) {
1da177e4 LT	95	block1 = ufs_fragstoblks (frag2);
	96	block2 = ufs_fragstoblks (frag3);
	97	}
	98
4b25a37e ED	99	UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
4b25a37e ED	100	" frag3 %llu, frag4 %llu\n", inode->i_ino,
54fb996a ED	101	(unsigned long long)frag1, (unsigned long long)frag2,
	102	(unsigned long long)block1, (unsigned long long)block2,
	103	(unsigned long long)frag3, (unsigned long long)frag4);
1da177e4 LT	104
	105	if (frag1 >= frag2)
	106	goto next1;
	107
	108	/*
	109	* Free first free fragments
	110	*/
54fb996a ED	111	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
54fb996a ED	112	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	113	if (!tmp )
1da177e4 LT	114	ufs_panic (sb, "ufs_trunc_direct", "internal error");
8682164a	115	frag2 -= frag1;
1da177e4	116	frag1 = ufs_fragnum (frag1);
09114eb8	117
8682164a	118	ufs_free_fragments(inode, tmp + frag1, frag2);
50aa4eb0	119	mark_inode_dirty(inode);
1da177e4 LT	120	frag_to_free = tmp + frag1;
	121
	122	next1:
	123	/*
	124	* Free whole blocks
	125	*/
	126	for (i = block1 ; i < block2; i++) {
54fb996a ED	127	p = ufs_get_direct_data_ptr(uspi, ufsi, i);
54fb996a ED	128	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	129	if (!tmp)
1da177e4 LT	130	continue;
54fb996a	131	ufs_data_ptr_clear(uspi, p);
50aa4eb0	132
1da177e4 LT	133	if (free_count == 0) {
	134	frag_to_free = tmp;
	135	free_count = uspi->s_fpb;
	136	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	137	free_count += uspi->s_fpb;
	138	else {
	139	ufs_free_blocks (inode, frag_to_free, free_count);
	140	frag_to_free = tmp;
	141	free_count = uspi->s_fpb;
	142	}
50aa4eb0	143	mark_inode_dirty(inode);
1da177e4 LT	144	}
	145
	146	if (free_count > 0)
	147	ufs_free_blocks (inode, frag_to_free, free_count);
	148
	149	if (frag3 >= frag4)
	150	goto next3;
	151
	152	/*
	153	* Free last free fragments
	154	*/
54fb996a ED	155	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
54fb996a ED	156	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	157	if (!tmp )
	158	ufs_panic(sb, "ufs_truncate_direct", "internal error");
	159	frag4 = ufs_fragnum (frag4);
54fb996a	160	ufs_data_ptr_clear(uspi, p);
50aa4eb0	161
1da177e4	162	ufs_free_fragments (inode, tmp, frag4);
50aa4eb0	163	mark_inode_dirty(inode);
1da177e4 LT	164	next3:
1da177e4 LT	165
4b25a37e	166	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	167	return retry;
	168	}
	169
	170
54fb996a	171	static int ufs_trunc_indirect(struct inode inode, u64 offset, void p)
1da177e4 LT	172	{
	173	struct super_block * sb;
	174	struct ufs_sb_private_info * uspi;
	175	struct ufs_buffer_head * ind_ubh;
54fb996a ED	176	void *ind;
	177	u64 tmp, indirect_block, i, frag_to_free;
	178	unsigned free_count;
1da177e4 LT	179	int retry;
1da177e4 LT	180
54fb996a ED	181	UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
	182	inode->i_ino, (unsigned long long)offset, p);
	183
	184	BUG_ON(!p);
1da177e4 LT	185
	186	sb = inode->i_sb;
	187	uspi = UFS_SB(sb)->s_uspi;
	188
	189	frag_to_free = 0;
	190	free_count = 0;
	191	retry = 0;
	192
54fb996a	193	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	194	if (!tmp)
	195	return 0;
	196	ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
54fb996a	197	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	198	ubh_brelse (ind_ubh);
	199	return 1;
	200	}
	201	if (!ind_ubh) {
54fb996a	202	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	203	return 0;
	204	}
	205
	206	indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
	207	for (i = indirect_block; i < uspi->s_apb; i++) {
54fb996a ED	208	ind = ubh_get_data_ptr(uspi, ind_ubh, i);
54fb996a ED	209	tmp = ufs_data_ptr_to_cpu(sb, ind);
1da177e4 LT	210	if (!tmp)
1da177e4 LT	211	continue;
09114eb8	212
54fb996a	213	ufs_data_ptr_clear(uspi, ind);
1da177e4 LT	214	ubh_mark_buffer_dirty(ind_ubh);
	215	if (free_count == 0) {
	216	frag_to_free = tmp;
	217	free_count = uspi->s_fpb;
	218	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	219	free_count += uspi->s_fpb;
	220	else {
	221	ufs_free_blocks (inode, frag_to_free, free_count);
	222	frag_to_free = tmp;
	223	free_count = uspi->s_fpb;
	224	}
50aa4eb0	225
1da177e4	226	mark_inode_dirty(inode);
1da177e4 LT	227	}
	228
	229	if (free_count > 0) {
	230	ufs_free_blocks (inode, frag_to_free, free_count);
	231	}
	232	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	233	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	234	ubh_get_data_ptr(uspi, ind_ubh, i)))
1da177e4 LT	235	break;
1da177e4 LT	236	if (i >= uspi->s_apb) {
54fb996a ED	237	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	238	ufs_data_ptr_clear(uspi, p);
50aa4eb0	239
2061df0f	240	ufs_free_blocks (inode, tmp, uspi->s_fpb);
50aa4eb0	241	mark_inode_dirty(inode);
2061df0f ED	242	ubh_bforget(ind_ubh);
2061df0f ED	243	ind_ubh = NULL;
1da177e4	244	}
9cb569d6 CH	245	if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh))
9cb569d6 CH	246	ubh_sync_block(ind_ubh);
1da177e4 LT	247	ubh_brelse (ind_ubh);
1da177e4 LT	248
4b25a37e	249	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	250
	251	return retry;
	252	}
	253
54fb996a	254	static int ufs_trunc_dindirect(struct inode inode, u64 offset, void p)
1da177e4 LT	255	{
	256	struct super_block * sb;
	257	struct ufs_sb_private_info * uspi;
54fb996a ED	258	struct ufs_buffer_head *dind_bh;
	259	u64 i, tmp, dindirect_block;
	260	void *dind;
1da177e4 LT	261	int retry = 0;
1da177e4 LT	262
4b25a37e	263	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4 LT	264
	265	sb = inode->i_sb;
	266	uspi = UFS_SB(sb)->s_uspi;
	267
	268	dindirect_block = (DIRECT_BLOCK > offset)
	269	? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
	270	retry = 0;
	271
54fb996a	272	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	273	if (!tmp)
	274	return 0;
	275	dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
54fb996a	276	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	277	ubh_brelse (dind_bh);
	278	return 1;
	279	}
	280	if (!dind_bh) {
54fb996a	281	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	282	return 0;
	283	}
	284
	285	for (i = dindirect_block ; i < uspi->s_apb ; i++) {
54fb996a ED	286	dind = ubh_get_data_ptr(uspi, dind_bh, i);
54fb996a ED	287	tmp = ufs_data_ptr_to_cpu(sb, dind);
1da177e4 LT	288	if (!tmp)
	289	continue;
	290	retry \|= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
	291	ubh_mark_buffer_dirty(dind_bh);
	292	}
	293
	294	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	295	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	296	ubh_get_data_ptr(uspi, dind_bh, i)))
1da177e4 LT	297	break;
1da177e4 LT	298	if (i >= uspi->s_apb) {
54fb996a ED	299	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	300	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	301
50aa4eb0 ED	302	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	303	mark_inode_dirty(inode);
2061df0f ED	304	ubh_bforget(dind_bh);
2061df0f ED	305	dind_bh = NULL;
1da177e4	306	}
9cb569d6 CH	307	if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh))
9cb569d6 CH	308	ubh_sync_block(dind_bh);
1da177e4 LT	309	ubh_brelse (dind_bh);
1da177e4 LT	310
4b25a37e	311	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	312
	313	return retry;
	314	}
	315
54fb996a	316	static int ufs_trunc_tindirect(struct inode *inode)
1da177e4	317	{
54fb996a ED	318	struct super_block *sb = inode->i_sb;
54fb996a ED	319	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1da177e4	320	struct ufs_inode_info *ufsi = UFS_I(inode);
1da177e4	321	struct ufs_buffer_head * tind_bh;
54fb996a ED	322	u64 tindirect_block, tmp, i;
54fb996a ED	323	void tind, p;
1da177e4 LT	324	int retry;
1da177e4 LT	325
4b25a37e	326	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4	327
1da177e4 LT	328	retry = 0;
	329
	330	tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
	331	? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
54fb996a ED	332
	333	p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
	334	if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
1da177e4 LT	335	return 0;
1da177e4 LT	336	tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
54fb996a	337	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	338	ubh_brelse (tind_bh);
	339	return 1;
	340	}
	341	if (!tind_bh) {
54fb996a	342	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	343	return 0;
	344	}
	345
	346	for (i = tindirect_block ; i < uspi->s_apb ; i++) {
0465fc0a	347	tind = ubh_get_data_ptr(uspi, tind_bh, i);
1da177e4 LT	348	retry \|= ufs_trunc_dindirect(inode, UFS_NDADDR +
	349	uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
	350	ubh_mark_buffer_dirty(tind_bh);
	351	}
	352	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	353	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	354	ubh_get_data_ptr(uspi, tind_bh, i)))
1da177e4 LT	355	break;
1da177e4 LT	356	if (i >= uspi->s_apb) {
54fb996a ED	357	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	358	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	359
50aa4eb0 ED	360	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	361	mark_inode_dirty(inode);
2061df0f ED	362	ubh_bforget(tind_bh);
2061df0f ED	363	tind_bh = NULL;
1da177e4	364	}
9cb569d6 CH	365	if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh))
9cb569d6 CH	366	ubh_sync_block(tind_bh);
1da177e4 LT	367	ubh_brelse (tind_bh);
1da177e4 LT	368
4b25a37e	369	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	370	return retry;
1da177e4 LT	371	}
10e5dce0 ED	372
10e5dce0 ED	373	static int ufs_alloc_lastblock(struct inode *inode)
1da177e4	374	{
10e5dce0	375	int err = 0;
4b25a37e	376	struct super_block *sb = inode->i_sb;
10e5dce0	377	struct address_space *mapping = inode->i_mapping;
4b25a37e	378	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
54fb996a ED	379	unsigned i, end;
54fb996a ED	380	sector_t lastfrag;
10e5dce0 ED	381	struct page *lastpage;
10e5dce0 ED	382	struct buffer_head *bh;
4b25a37e	383	u64 phys64;
10e5dce0 ED	384
	385	lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
	386
ecdc6394	387	if (!lastfrag)
10e5dce0	388	goto out;
ecdc6394	389
10e5dce0 ED	390	lastfrag--;
	391
	392	lastpage = ufs_get_locked_page(mapping, lastfrag >>
	393	(PAGE_CACHE_SHIFT - inode->i_blkbits));
	394	if (IS_ERR(lastpage)) {
	395	err = -EIO;
	396	goto out;
	397	}
	398
	399	end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
	400	bh = page_buffers(lastpage);
	401	for (i = 0; i < end; ++i)
	402	bh = bh->b_this_page;
	403
ecdc6394 ED	404
	405	err = ufs_getfrag_block(inode, lastfrag, bh, 1);
	406
	407	if (unlikely(err))
	408	goto out_unlock;
	409
	410	if (buffer_new(bh)) {
	411	clear_buffer_new(bh);
	412	unmap_underlying_metadata(bh->b_bdev,
	413	bh->b_blocknr);
	414	/*
	415	* we do not zeroize fragment, because of
	416	* if it maped to hole, it already contains zeroes
	417	*/
	418	set_buffer_uptodate(bh);
	419	mark_buffer_dirty(bh);
	420	set_page_dirty(lastpage);
10e5dce0	421	}
ecdc6394	422
4b25a37e ED	423	if (lastfrag >= UFS_IND_FRAGMENT) {
	424	end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
	425	phys64 = bh->b_blocknr + 1;
	426	for (i = 0; i < end; ++i) {
	427	bh = sb_getblk(sb, i + phys64);
	428	lock_buffer(bh);
	429	memset(bh->b_data, 0, sb->s_blocksize);
	430	set_buffer_uptodate(bh);
	431	mark_buffer_dirty(bh);
	432	unlock_buffer(bh);
	433	sync_dirty_buffer(bh);
	434	brelse(bh);
	435	}
	436	}
10e5dce0 ED	437	out_unlock:
	438	ufs_put_locked_page(lastpage);
	439	out:
	440	return err;
	441	}
	442
	443	int ufs_truncate(struct inode *inode, loff_t old_i_size)
	444	{
	445	struct ufs_inode_info *ufsi = UFS_I(inode);
	446	struct super_block *sb = inode->i_sb;
	447	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	448	int retry, err = 0;
1da177e4	449
54fb996a ED	450	UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
	451	inode->i_ino, (unsigned long long)i_size_read(inode),
	452	(unsigned long long)old_i_size);
1da177e4	453
10e5dce0 ED	454	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	455	S_ISLNK(inode->i_mode)))
	456	return -EINVAL;
1da177e4	457	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
10e5dce0 ED	458	return -EPERM;
10e5dce0 ED	459
ecdc6394	460	err = ufs_alloc_lastblock(inode);
10e5dce0	461
ecdc6394 ED	462	if (err) {
	463	i_size_write(inode, old_i_size);
	464	goto out;
10e5dce0	465	}
09114eb8	466
10e5dce0	467	block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
09114eb8	468
1da177e4 LT	469	while (1) {
1da177e4 LT	470	retry = ufs_trunc_direct(inode);
54fb996a ED	471	retry \|= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
	472	ufs_get_direct_data_ptr(uspi, ufsi,
	473	UFS_IND_BLOCK));
	474	retry \|= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
	475	ufs_get_direct_data_ptr(uspi, ufsi,
	476	UFS_DIND_BLOCK));
1da177e4 LT	477	retry \|= ufs_trunc_tindirect (inode);
	478	if (!retry)
	479	break;
	480	if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
	481	ufs_sync_inode (inode);
1da177e4 LT	482	yield();
1da177e4 LT	483	}
09114eb8	484
1da177e4	485	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
ecdc6394	486	ufsi->i_lastfrag = DIRECT_FRAGMENT;
1da177e4	487	mark_inode_dirty(inode);
10e5dce0 ED	488	out:
	489	UFSD("EXIT: err %d\n", err);
	490	return err;
1da177e4	491	}
10e5dce0	492
311b9549	493	int ufs_setattr(struct dentry dentry, struct iattr attr)
10e5dce0 ED	494	{
	495	struct inode *inode = dentry->d_inode;
	496	unsigned int ia_valid = attr->ia_valid;
	497	int error;
	498
	499	error = inode_change_ok(inode, attr);
	500	if (error)
	501	return error;
	502
12755627	503	if (ia_valid & ATTR_SIZE && attr->ia_size != inode->i_size) {
10e5dce0	504	loff_t old_i_size = inode->i_size;
907f4554	505
2c27c65e CH	506	/* XXX(truncate): truncate_setsize should be called last */
	507	truncate_setsize(inode, attr->ia_size);
	508
788257d6	509	lock_ufs(inode->i_sb);
10e5dce0	510	error = ufs_truncate(inode, old_i_size);
788257d6	511	unlock_ufs(inode->i_sb);
10e5dce0 ED	512	if (error)
	513	return error;
	514	}
1025774c CH	515
	516	setattr_copy(inode, attr);
	517	mark_inode_dirty(inode);
	518	return 0;
10e5dce0 ED	519	}
10e5dce0 ED	520
c5ef1c42	521	const struct inode_operations ufs_file_inode_operations = {
10e5dce0 ED	522	.setattr = ufs_setattr,
10e5dce0 ED	523	};