[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 <linux/quotaops.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;
}


/*
 * We don't define our `inode->i_op->truncate', and call it here,
 * because of:
 * - there is no way to know old size
 * - there is no way inform user about error, if it happens in `truncate'
 */
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_UID && attr->ia_uid != inode->i_uid) ||
	    (ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
		error = dquot_transfer(inode, attr);
		if (error)
			return error;
	}
	if (ia_valid & ATTR_SIZE &&
	    attr->ia_size != i_size_read(inode)) {
		loff_t old_i_size = inode->i_size;

		dquot_initialize(inode);

		error = vmtruncate(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>
759bfee6	47	#include <linux/quotaops.h>
1da177e4	48
e5420598	49	#include "ufs_fs.h"
bcd6d4ec	50	#include "ufs.h"
1da177e4 LT	51	#include "swab.h"
	52	#include "util.h"
	53
1da177e4 LT	54	/*
	55	* Secure deletion currently doesn't work. It interacts very badly
	56	* with buffers shared with memory mappings, and for that reason
	57	* can't be done in the truncate() routines. It should instead be
	58	* done separately in "release()" before calling the truncate routines
	59	* that will release the actual file blocks.
	60	*
	61	* Linus
	62	*/
	63
	64	#define DIRECT_BLOCK ((inode->i_size + uspi->s_bsize - 1) >> uspi->s_bshift)
	65	#define DIRECT_FRAGMENT ((inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift)
	66
1da177e4	67
54fb996a	68	static int ufs_trunc_direct(struct inode *inode)
1da177e4 LT	69	{
	70	struct ufs_inode_info *ufsi = UFS_I(inode);
	71	struct super_block * sb;
	72	struct ufs_sb_private_info * uspi;
54fb996a ED	73	void *p;
54fb996a ED	74	u64 frag1, frag2, frag3, frag4, block1, block2;
1da177e4	75	unsigned frag_to_free, free_count;
09114eb8	76	unsigned i, tmp;
1da177e4 LT	77	int retry;
1da177e4 LT	78
4b25a37e	79	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4 LT	80
	81	sb = inode->i_sb;
	82	uspi = UFS_SB(sb)->s_uspi;
	83
	84	frag_to_free = 0;
	85	free_count = 0;
	86	retry = 0;
	87
	88	frag1 = DIRECT_FRAGMENT;
	89	frag4 = min_t(u32, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
	90	frag2 = ((frag1 & uspi->s_fpbmask) ? ((frag1 \| uspi->s_fpbmask) + 1) : frag1);
	91	frag3 = frag4 & ~uspi->s_fpbmask;
	92	block1 = block2 = 0;
	93	if (frag2 > frag3) {
	94	frag2 = frag4;
	95	frag3 = frag4 = 0;
54fb996a	96	} else if (frag2 < frag3) {
1da177e4 LT	97	block1 = ufs_fragstoblks (frag2);
	98	block2 = ufs_fragstoblks (frag3);
	99	}
	100
4b25a37e ED	101	UFSD("ino %lu, frag1 %llu, frag2 %llu, block1 %llu, block2 %llu,"
4b25a37e ED	102	" frag3 %llu, frag4 %llu\n", inode->i_ino,
54fb996a ED	103	(unsigned long long)frag1, (unsigned long long)frag2,
	104	(unsigned long long)block1, (unsigned long long)block2,
	105	(unsigned long long)frag3, (unsigned long long)frag4);
1da177e4 LT	106
	107	if (frag1 >= frag2)
	108	goto next1;
	109
	110	/*
	111	* Free first free fragments
	112	*/
54fb996a ED	113	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag1));
54fb996a ED	114	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	115	if (!tmp )
1da177e4 LT	116	ufs_panic (sb, "ufs_trunc_direct", "internal error");
8682164a	117	frag2 -= frag1;
1da177e4	118	frag1 = ufs_fragnum (frag1);
09114eb8	119
8682164a	120	ufs_free_fragments(inode, tmp + frag1, frag2);
50aa4eb0	121	mark_inode_dirty(inode);
1da177e4 LT	122	frag_to_free = tmp + frag1;
	123
	124	next1:
	125	/*
	126	* Free whole blocks
	127	*/
	128	for (i = block1 ; i < block2; i++) {
54fb996a ED	129	p = ufs_get_direct_data_ptr(uspi, ufsi, i);
54fb996a ED	130	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	131	if (!tmp)
1da177e4 LT	132	continue;
54fb996a	133	ufs_data_ptr_clear(uspi, p);
50aa4eb0	134
1da177e4 LT	135	if (free_count == 0) {
	136	frag_to_free = tmp;
	137	free_count = uspi->s_fpb;
	138	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	139	free_count += uspi->s_fpb;
	140	else {
	141	ufs_free_blocks (inode, frag_to_free, free_count);
	142	frag_to_free = tmp;
	143	free_count = uspi->s_fpb;
	144	}
50aa4eb0	145	mark_inode_dirty(inode);
1da177e4 LT	146	}
	147
	148	if (free_count > 0)
	149	ufs_free_blocks (inode, frag_to_free, free_count);
	150
	151	if (frag3 >= frag4)
	152	goto next3;
	153
	154	/*
	155	* Free last free fragments
	156	*/
54fb996a ED	157	p = ufs_get_direct_data_ptr(uspi, ufsi, ufs_fragstoblks(frag3));
54fb996a ED	158	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	159	if (!tmp )
	160	ufs_panic(sb, "ufs_truncate_direct", "internal error");
	161	frag4 = ufs_fragnum (frag4);
54fb996a	162	ufs_data_ptr_clear(uspi, p);
50aa4eb0	163
1da177e4	164	ufs_free_fragments (inode, tmp, frag4);
50aa4eb0	165	mark_inode_dirty(inode);
1da177e4 LT	166	next3:
1da177e4 LT	167
4b25a37e	168	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	169	return retry;
	170	}
	171
	172
54fb996a	173	static int ufs_trunc_indirect(struct inode inode, u64 offset, void p)
1da177e4 LT	174	{
	175	struct super_block * sb;
	176	struct ufs_sb_private_info * uspi;
	177	struct ufs_buffer_head * ind_ubh;
54fb996a ED	178	void *ind;
	179	u64 tmp, indirect_block, i, frag_to_free;
	180	unsigned free_count;
1da177e4 LT	181	int retry;
1da177e4 LT	182
54fb996a ED	183	UFSD("ENTER: ino %lu, offset %llu, p: %p\n",
	184	inode->i_ino, (unsigned long long)offset, p);
	185
	186	BUG_ON(!p);
1da177e4 LT	187
	188	sb = inode->i_sb;
	189	uspi = UFS_SB(sb)->s_uspi;
	190
	191	frag_to_free = 0;
	192	free_count = 0;
	193	retry = 0;
	194
54fb996a	195	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	196	if (!tmp)
	197	return 0;
	198	ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
54fb996a	199	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	200	ubh_brelse (ind_ubh);
	201	return 1;
	202	}
	203	if (!ind_ubh) {
54fb996a	204	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	205	return 0;
	206	}
	207
	208	indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
	209	for (i = indirect_block; i < uspi->s_apb; i++) {
54fb996a ED	210	ind = ubh_get_data_ptr(uspi, ind_ubh, i);
54fb996a ED	211	tmp = ufs_data_ptr_to_cpu(sb, ind);
1da177e4 LT	212	if (!tmp)
1da177e4 LT	213	continue;
09114eb8	214
54fb996a	215	ufs_data_ptr_clear(uspi, ind);
1da177e4 LT	216	ubh_mark_buffer_dirty(ind_ubh);
	217	if (free_count == 0) {
	218	frag_to_free = tmp;
	219	free_count = uspi->s_fpb;
	220	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	221	free_count += uspi->s_fpb;
	222	else {
	223	ufs_free_blocks (inode, frag_to_free, free_count);
	224	frag_to_free = tmp;
	225	free_count = uspi->s_fpb;
	226	}
50aa4eb0	227
1da177e4	228	mark_inode_dirty(inode);
1da177e4 LT	229	}
	230
	231	if (free_count > 0) {
	232	ufs_free_blocks (inode, frag_to_free, free_count);
	233	}
	234	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	235	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	236	ubh_get_data_ptr(uspi, ind_ubh, i)))
1da177e4 LT	237	break;
1da177e4 LT	238	if (i >= uspi->s_apb) {
54fb996a ED	239	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	240	ufs_data_ptr_clear(uspi, p);
50aa4eb0	241
2061df0f	242	ufs_free_blocks (inode, tmp, uspi->s_fpb);
50aa4eb0	243	mark_inode_dirty(inode);
2061df0f ED	244	ubh_bforget(ind_ubh);
2061df0f ED	245	ind_ubh = NULL;
1da177e4 LT	246	}
1da177e4 LT	247	if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
098d5af7	248	ubh_ll_rw_block(SWRITE, ind_ubh);
1da177e4 LT	249	ubh_wait_on_buffer (ind_ubh);
	250	}
	251	ubh_brelse (ind_ubh);
	252
4b25a37e	253	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	254
	255	return retry;
	256	}
	257
54fb996a	258	static int ufs_trunc_dindirect(struct inode inode, u64 offset, void p)
1da177e4 LT	259	{
	260	struct super_block * sb;
	261	struct ufs_sb_private_info * uspi;
54fb996a ED	262	struct ufs_buffer_head *dind_bh;
	263	u64 i, tmp, dindirect_block;
	264	void *dind;
1da177e4 LT	265	int retry = 0;
1da177e4 LT	266
4b25a37e	267	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4 LT	268
	269	sb = inode->i_sb;
	270	uspi = UFS_SB(sb)->s_uspi;
	271
	272	dindirect_block = (DIRECT_BLOCK > offset)
	273	? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
	274	retry = 0;
	275
54fb996a	276	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	277	if (!tmp)
	278	return 0;
	279	dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
54fb996a	280	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	281	ubh_brelse (dind_bh);
	282	return 1;
	283	}
	284	if (!dind_bh) {
54fb996a	285	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	286	return 0;
	287	}
	288
	289	for (i = dindirect_block ; i < uspi->s_apb ; i++) {
54fb996a ED	290	dind = ubh_get_data_ptr(uspi, dind_bh, i);
54fb996a ED	291	tmp = ufs_data_ptr_to_cpu(sb, dind);
1da177e4 LT	292	if (!tmp)
	293	continue;
	294	retry \|= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
	295	ubh_mark_buffer_dirty(dind_bh);
	296	}
	297
	298	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	299	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	300	ubh_get_data_ptr(uspi, dind_bh, i)))
1da177e4 LT	301	break;
1da177e4 LT	302	if (i >= uspi->s_apb) {
54fb996a ED	303	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	304	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	305
50aa4eb0 ED	306	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	307	mark_inode_dirty(inode);
2061df0f ED	308	ubh_bforget(dind_bh);
2061df0f ED	309	dind_bh = NULL;
1da177e4 LT	310	}
1da177e4 LT	311	if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
098d5af7	312	ubh_ll_rw_block(SWRITE, dind_bh);
1da177e4 LT	313	ubh_wait_on_buffer (dind_bh);
	314	}
	315	ubh_brelse (dind_bh);
	316
4b25a37e	317	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	318
	319	return retry;
	320	}
	321
54fb996a	322	static int ufs_trunc_tindirect(struct inode *inode)
1da177e4	323	{
54fb996a ED	324	struct super_block *sb = inode->i_sb;
54fb996a ED	325	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1da177e4	326	struct ufs_inode_info *ufsi = UFS_I(inode);
1da177e4	327	struct ufs_buffer_head * tind_bh;
54fb996a ED	328	u64 tindirect_block, tmp, i;
54fb996a ED	329	void tind, p;
1da177e4 LT	330	int retry;
1da177e4 LT	331
4b25a37e	332	UFSD("ENTER: ino %lu\n", inode->i_ino);
1da177e4	333
1da177e4 LT	334	retry = 0;
	335
	336	tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
	337	? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
54fb996a ED	338
	339	p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
	340	if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
1da177e4 LT	341	return 0;
1da177e4 LT	342	tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
54fb996a	343	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	344	ubh_brelse (tind_bh);
	345	return 1;
	346	}
	347	if (!tind_bh) {
54fb996a	348	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	349	return 0;
	350	}
	351
	352	for (i = tindirect_block ; i < uspi->s_apb ; i++) {
0465fc0a	353	tind = ubh_get_data_ptr(uspi, tind_bh, i);
1da177e4 LT	354	retry \|= ufs_trunc_dindirect(inode, UFS_NDADDR +
	355	uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
	356	ubh_mark_buffer_dirty(tind_bh);
	357	}
	358	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	359	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	360	ubh_get_data_ptr(uspi, tind_bh, i)))
1da177e4 LT	361	break;
1da177e4 LT	362	if (i >= uspi->s_apb) {
54fb996a ED	363	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	364	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	365
50aa4eb0 ED	366	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	367	mark_inode_dirty(inode);
2061df0f ED	368	ubh_bforget(tind_bh);
2061df0f ED	369	tind_bh = NULL;
1da177e4 LT	370	}
1da177e4 LT	371	if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
098d5af7	372	ubh_ll_rw_block(SWRITE, tind_bh);
1da177e4 LT	373	ubh_wait_on_buffer (tind_bh);
	374	}
	375	ubh_brelse (tind_bh);
	376
4b25a37e	377	UFSD("EXIT: ino %lu\n", inode->i_ino);
1da177e4 LT	378	return retry;
1da177e4 LT	379	}
10e5dce0 ED	380
10e5dce0 ED	381	static int ufs_alloc_lastblock(struct inode *inode)
1da177e4	382	{
10e5dce0	383	int err = 0;
4b25a37e	384	struct super_block *sb = inode->i_sb;
10e5dce0	385	struct address_space *mapping = inode->i_mapping;
4b25a37e	386	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
54fb996a ED	387	unsigned i, end;
54fb996a ED	388	sector_t lastfrag;
10e5dce0 ED	389	struct page *lastpage;
10e5dce0 ED	390	struct buffer_head *bh;
4b25a37e	391	u64 phys64;
10e5dce0 ED	392
	393	lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
	394
ecdc6394	395	if (!lastfrag)
10e5dce0	396	goto out;
ecdc6394	397
10e5dce0 ED	398	lastfrag--;
	399
	400	lastpage = ufs_get_locked_page(mapping, lastfrag >>
	401	(PAGE_CACHE_SHIFT - inode->i_blkbits));
	402	if (IS_ERR(lastpage)) {
	403	err = -EIO;
	404	goto out;
	405	}
	406
	407	end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
	408	bh = page_buffers(lastpage);
	409	for (i = 0; i < end; ++i)
	410	bh = bh->b_this_page;
	411
ecdc6394 ED	412
	413	err = ufs_getfrag_block(inode, lastfrag, bh, 1);
	414
	415	if (unlikely(err))
	416	goto out_unlock;
	417
	418	if (buffer_new(bh)) {
	419	clear_buffer_new(bh);
	420	unmap_underlying_metadata(bh->b_bdev,
	421	bh->b_blocknr);
	422	/*
	423	* we do not zeroize fragment, because of
	424	* if it maped to hole, it already contains zeroes
	425	*/
	426	set_buffer_uptodate(bh);
	427	mark_buffer_dirty(bh);
	428	set_page_dirty(lastpage);
10e5dce0	429	}
ecdc6394	430
4b25a37e ED	431	if (lastfrag >= UFS_IND_FRAGMENT) {
	432	end = uspi->s_fpb - ufs_fragnum(lastfrag) - 1;
	433	phys64 = bh->b_blocknr + 1;
	434	for (i = 0; i < end; ++i) {
	435	bh = sb_getblk(sb, i + phys64);
	436	lock_buffer(bh);
	437	memset(bh->b_data, 0, sb->s_blocksize);
	438	set_buffer_uptodate(bh);
	439	mark_buffer_dirty(bh);
	440	unlock_buffer(bh);
	441	sync_dirty_buffer(bh);
	442	brelse(bh);
	443	}
	444	}
10e5dce0 ED	445	out_unlock:
	446	ufs_put_locked_page(lastpage);
	447	out:
	448	return err;
	449	}
	450
	451	int ufs_truncate(struct inode *inode, loff_t old_i_size)
	452	{
	453	struct ufs_inode_info *ufsi = UFS_I(inode);
	454	struct super_block *sb = inode->i_sb;
	455	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	456	int retry, err = 0;
1da177e4	457
54fb996a ED	458	UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
	459	inode->i_ino, (unsigned long long)i_size_read(inode),
	460	(unsigned long long)old_i_size);
1da177e4	461
10e5dce0 ED	462	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	463	S_ISLNK(inode->i_mode)))
	464	return -EINVAL;
1da177e4	465	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
10e5dce0 ED	466	return -EPERM;
10e5dce0 ED	467
ecdc6394	468	err = ufs_alloc_lastblock(inode);
10e5dce0	469
ecdc6394 ED	470	if (err) {
	471	i_size_write(inode, old_i_size);
	472	goto out;
10e5dce0	473	}
09114eb8	474
10e5dce0	475	block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
09114eb8	476
1da177e4 LT	477	lock_kernel();
	478	while (1) {
	479	retry = ufs_trunc_direct(inode);
54fb996a ED	480	retry \|= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
	481	ufs_get_direct_data_ptr(uspi, ufsi,
	482	UFS_IND_BLOCK));
	483	retry \|= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
	484	ufs_get_direct_data_ptr(uspi, ufsi,
	485	UFS_DIND_BLOCK));
1da177e4 LT	486	retry \|= ufs_trunc_tindirect (inode);
	487	if (!retry)
	488	break;
	489	if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
	490	ufs_sync_inode (inode);
	491	blk_run_address_space(inode->i_mapping);
	492	yield();
	493	}
09114eb8	494
1da177e4	495	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
ecdc6394	496	ufsi->i_lastfrag = DIRECT_FRAGMENT;
1da177e4 LT	497	unlock_kernel();
1da177e4 LT	498	mark_inode_dirty(inode);
10e5dce0 ED	499	out:
	500	UFSD("EXIT: err %d\n", err);
	501	return err;
1da177e4	502	}
10e5dce0 ED	503
	504
	505	/*
	506	* We don't define our `inode->i_op->truncate', and call it here,
	507	* because of:
	508	* - there is no way to know old size
	509	* - there is no way inform user about error, if it happens in `truncate'
	510	*/
311b9549	511	int ufs_setattr(struct dentry dentry, struct iattr attr)
10e5dce0 ED	512	{
	513	struct inode *inode = dentry->d_inode;
	514	unsigned int ia_valid = attr->ia_valid;
	515	int error;
	516
	517	error = inode_change_ok(inode, attr);
	518	if (error)
	519	return error;
	520
759bfee6 CH	521	if ((ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) \|\|
759bfee6 CH	522	(ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
b43fa828	523	error = dquot_transfer(inode, attr);
759bfee6 CH	524	if (error)
	525	return error;
	526	}
10e5dce0 ED	527	if (ia_valid & ATTR_SIZE &&
	528	attr->ia_size != i_size_read(inode)) {
	529	loff_t old_i_size = inode->i_size;
907f4554	530
871a2931	531	dquot_initialize(inode);
907f4554	532
10e5dce0 ED	533	error = vmtruncate(inode, attr->ia_size);
	534	if (error)
	535	return error;
	536	error = ufs_truncate(inode, old_i_size);
	537	if (error)
	538	return error;
	539	}
	540	return inode_setattr(inode, attr);
	541	}
	542
c5ef1c42	543	const struct inode_operations ufs_file_inode_operations = {
10e5dce0 ED	544	.setattr = ufs_setattr,
10e5dce0 ED	545	};