[deliverable/linux.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>
 */

/*
 * Modified to avoid infinite loop on 2006 by
 * Evgeniy Dushistov <dushistov@mail.ru>
 */

#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/ufs_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 "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;
	__fs32 * p;
	unsigned frag1, frag2, frag3, frag4, block1, block2;
	unsigned frag_to_free, free_count;
	unsigned i, tmp;
	int retry;
	
	UFSD("ENTER\n");

	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("frag1 %u, frag2 %u, block1 %u, block2 %u, frag3 %u, frag4 %u\n", frag1, frag2, block1, block2, frag3, frag4);

	if (frag1 >= frag2)
		goto next1;		

	/*
	 * Free first free fragments
	 */
	p = ufsi->i_u1.i_data + ufs_fragstoblks (frag1);
	tmp = fs32_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 = ufsi->i_u1.i_data + i;
		tmp = fs32_to_cpu(sb, *p);
		if (!tmp)
			continue;

		*p = 0;

		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 = ufsi->i_u1.i_data + ufs_fragstoblks (frag3);
	tmp = fs32_to_cpu(sb, *p);
	if (!tmp )
		ufs_panic(sb, "ufs_truncate_direct", "internal error");
	frag4 = ufs_fragnum (frag4);

	*p = 0;

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

	UFSD("EXIT\n");
	return retry;
}


static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
{
	struct super_block * sb;
	struct ufs_sb_private_info * uspi;
	struct ufs_buffer_head * ind_ubh;
	__fs32 * ind;
	unsigned indirect_block, i, tmp;
	unsigned frag_to_free, free_count;
	int retry;

	UFSD("ENTER\n");
		
	sb = inode->i_sb;
	uspi = UFS_SB(sb)->s_uspi;

	frag_to_free = 0;
	free_count = 0;
	retry = 0;
	
	tmp = fs32_to_cpu(sb, *p);
	if (!tmp)
		return 0;
	ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
	if (tmp != fs32_to_cpu(sb, *p)) {
		ubh_brelse (ind_ubh);
		return 1;
	}
	if (!ind_ubh) {
		*p = 0;
		return 0;
	}

	indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
	for (i = indirect_block; i < uspi->s_apb; i++) {
		ind = ubh_get_addr32 (ind_ubh, i);
		tmp = fs32_to_cpu(sb, *ind);
		if (!tmp)
			continue;

		*ind = 0;
		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 (*ubh_get_addr32(ind_ubh,i))
			break;
	if (i >= uspi->s_apb) {
		tmp = fs32_to_cpu(sb, *p);
		*p = 0;

		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\n");
	
	return retry;
}

static int ufs_trunc_dindirect (struct inode *inode, unsigned offset, __fs32 *p)
{
	struct super_block * sb;
	struct ufs_sb_private_info * uspi;
	struct ufs_buffer_head * dind_bh;
	unsigned i, tmp, dindirect_block;
	__fs32 * dind;
	int retry = 0;
	
	UFSD("ENTER\n");
	
	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 = fs32_to_cpu(sb, *p);
	if (!tmp)
		return 0;
	dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
	if (tmp != fs32_to_cpu(sb, *p)) {
		ubh_brelse (dind_bh);
		return 1;
	}
	if (!dind_bh) {
		*p = 0;
		return 0;
	}

	for (i = dindirect_block ; i < uspi->s_apb ; i++) {
		dind = ubh_get_addr32 (dind_bh, i);
		tmp = fs32_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 (*ubh_get_addr32 (dind_bh, i))
			break;
	if (i >= uspi->s_apb) {
		tmp = fs32_to_cpu(sb, *p);
		*p = 0;

		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\n");
	
	return retry;
}

static int ufs_trunc_tindirect (struct inode * inode)
{
	struct ufs_inode_info *ufsi = UFS_I(inode);
	struct super_block * sb;
	struct ufs_sb_private_info * uspi;
	struct ufs_buffer_head * tind_bh;
	unsigned tindirect_block, tmp, i;
	__fs32 * tind, * p;
	int retry;
	
	UFSD("ENTER\n");

	sb = inode->i_sb;
	uspi = UFS_SB(sb)->s_uspi;
	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 = ufsi->i_u1.i_data + UFS_TIND_BLOCK;
	if (!(tmp = fs32_to_cpu(sb, *p)))
		return 0;
	tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
	if (tmp != fs32_to_cpu(sb, *p)) {
		ubh_brelse (tind_bh);
		return 1;
	}
	if (!tind_bh) {
		*p = 0;
		return 0;
	}

	for (i = tindirect_block ; i < uspi->s_apb ; i++) {
		tind = ubh_get_addr32 (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 (*ubh_get_addr32 (tind_bh, i))
			break;
	if (i >= uspi->s_apb) {
		tmp = fs32_to_cpu(sb, *p);
		*p = 0;

		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\n");
	return retry;
}

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

	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);
       }

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\n");

	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,
			(__fs32 *) &ufsi->i_u1.i_data[UFS_IND_BLOCK]);
		retry |= ufs_trunc_dindirect (inode, UFS_IND_BLOCK + uspi->s_apb,
			(__fs32 *) &ufsi->i_u1.i_data[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'
 */
static 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 != i_size_read(inode)) {
		loff_t old_i_size = inode->i_size;
		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);
}

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 ED	32	/*
	33	* Modified to avoid infinite loop on 2006 by
	34	* Evgeniy Dushistov <dushistov@mail.ru>
	35	*/
	36
1da177e4 LT	37	#include <linux/errno.h>
	38	#include <linux/fs.h>
	39	#include <linux/ufs_fs.h>
	40	#include <linux/fcntl.h>
	41	#include <linux/time.h>
	42	#include <linux/stat.h>
	43	#include <linux/string.h>
	44	#include <linux/smp_lock.h>
	45	#include <linux/buffer_head.h>
	46	#include <linux/blkdev.h>
	47	#include <linux/sched.h>
	48
	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 LT	65
	66	static int ufs_trunc_direct (struct inode * inode)
	67	{
	68	struct ufs_inode_info *ufsi = UFS_I(inode);
	69	struct super_block * sb;
	70	struct ufs_sb_private_info * uspi;
1da177e4 LT	71	__fs32 * p;
	72	unsigned frag1, frag2, frag3, frag4, block1, block2;
	73	unsigned frag_to_free, free_count;
09114eb8	74	unsigned i, tmp;
1da177e4 LT	75	int retry;
1da177e4 LT	76
abf5d15f	77	UFSD("ENTER\n");
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;
	87	frag4 = min_t(u32, UFS_NDIR_FRAGMENT, ufsi->i_lastfrag);
	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;
	94	}
	95	else if (frag2 < frag3) {
	96	block1 = ufs_fragstoblks (frag2);
	97	block2 = ufs_fragstoblks (frag3);
	98	}
	99
abf5d15f	100	UFSD("frag1 %u, frag2 %u, block1 %u, block2 %u, frag3 %u, frag4 %u\n", frag1, frag2, block1, block2, frag3, frag4);
1da177e4 LT	101
	102	if (frag1 >= frag2)
	103	goto next1;
	104
	105	/*
	106	* Free first free fragments
	107	*/
	108	p = ufsi->i_u1.i_data + ufs_fragstoblks (frag1);
	109	tmp = fs32_to_cpu(sb, *p);
	110	if (!tmp )
	111	ufs_panic (sb, "ufs_trunc_direct", "internal error");
8682164a	112	frag2 -= frag1;
1da177e4	113	frag1 = ufs_fragnum (frag1);
09114eb8	114
8682164a	115	ufs_free_fragments(inode, tmp + frag1, frag2);
50aa4eb0	116	mark_inode_dirty(inode);
1da177e4 LT	117	frag_to_free = tmp + frag1;
	118
	119	next1:
	120	/*
	121	* Free whole blocks
	122	*/
	123	for (i = block1 ; i < block2; i++) {
	124	p = ufsi->i_u1.i_data + i;
	125	tmp = fs32_to_cpu(sb, *p);
	126	if (!tmp)
	127	continue;
09114eb8	128
1da177e4	129	*p = 0;
50aa4eb0	130
1da177e4 LT	131	if (free_count == 0) {
	132	frag_to_free = tmp;
	133	free_count = uspi->s_fpb;
	134	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	135	free_count += uspi->s_fpb;
	136	else {
	137	ufs_free_blocks (inode, frag_to_free, free_count);
	138	frag_to_free = tmp;
	139	free_count = uspi->s_fpb;
	140	}
50aa4eb0	141	mark_inode_dirty(inode);
1da177e4 LT	142	}
	143
	144	if (free_count > 0)
	145	ufs_free_blocks (inode, frag_to_free, free_count);
	146
	147	if (frag3 >= frag4)
	148	goto next3;
	149
	150	/*
	151	* Free last free fragments
	152	*/
	153	p = ufsi->i_u1.i_data + ufs_fragstoblks (frag3);
	154	tmp = fs32_to_cpu(sb, *p);
	155	if (!tmp )
	156	ufs_panic(sb, "ufs_truncate_direct", "internal error");
	157	frag4 = ufs_fragnum (frag4);
09114eb8	158
1da177e4	159	*p = 0;
50aa4eb0	160
1da177e4	161	ufs_free_fragments (inode, tmp, frag4);
50aa4eb0	162	mark_inode_dirty(inode);
1da177e4 LT	163	next3:
1da177e4 LT	164
abf5d15f	165	UFSD("EXIT\n");
1da177e4 LT	166	return retry;
	167	}
	168
	169
	170	static int ufs_trunc_indirect (struct inode * inode, unsigned offset, __fs32 *p)
	171	{
	172	struct super_block * sb;
	173	struct ufs_sb_private_info * uspi;
	174	struct ufs_buffer_head * ind_ubh;
1da177e4	175	__fs32 * ind;
09114eb8	176	unsigned indirect_block, i, tmp;
1da177e4 LT	177	unsigned frag_to_free, free_count;
	178	int retry;
	179
abf5d15f	180	UFSD("ENTER\n");
1da177e4 LT	181
	182	sb = inode->i_sb;
	183	uspi = UFS_SB(sb)->s_uspi;
	184
	185	frag_to_free = 0;
	186	free_count = 0;
	187	retry = 0;
	188
	189	tmp = fs32_to_cpu(sb, *p);
	190	if (!tmp)
	191	return 0;
	192	ind_ubh = ubh_bread(sb, tmp, uspi->s_bsize);
	193	if (tmp != fs32_to_cpu(sb, *p)) {
	194	ubh_brelse (ind_ubh);
	195	return 1;
	196	}
	197	if (!ind_ubh) {
	198	*p = 0;
	199	return 0;
	200	}
	201
	202	indirect_block = (DIRECT_BLOCK > offset) ? (DIRECT_BLOCK - offset) : 0;
	203	for (i = indirect_block; i < uspi->s_apb; i++) {
	204	ind = ubh_get_addr32 (ind_ubh, i);
	205	tmp = fs32_to_cpu(sb, *ind);
	206	if (!tmp)
	207	continue;
09114eb8	208
1da177e4 LT	209	*ind = 0;
	210	ubh_mark_buffer_dirty(ind_ubh);
	211	if (free_count == 0) {
	212	frag_to_free = tmp;
	213	free_count = uspi->s_fpb;
	214	} else if (free_count > 0 && frag_to_free == tmp - free_count)
	215	free_count += uspi->s_fpb;
	216	else {
	217	ufs_free_blocks (inode, frag_to_free, free_count);
	218	frag_to_free = tmp;
	219	free_count = uspi->s_fpb;
	220	}
50aa4eb0	221
1da177e4	222	mark_inode_dirty(inode);
1da177e4 LT	223	}
	224
	225	if (free_count > 0) {
	226	ufs_free_blocks (inode, frag_to_free, free_count);
	227	}
	228	for (i = 0; i < uspi->s_apb; i++)
	229	if (*ubh_get_addr32(ind_ubh,i))
	230	break;
	231	if (i >= uspi->s_apb) {
2061df0f ED	232	tmp = fs32_to_cpu(sb, *p);
2061df0f ED	233	*p = 0;
50aa4eb0	234
2061df0f	235	ufs_free_blocks (inode, tmp, uspi->s_fpb);
50aa4eb0	236	mark_inode_dirty(inode);
2061df0f ED	237	ubh_bforget(ind_ubh);
2061df0f ED	238	ind_ubh = NULL;
1da177e4 LT	239	}
1da177e4 LT	240	if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
098d5af7	241	ubh_ll_rw_block(SWRITE, ind_ubh);
1da177e4 LT	242	ubh_wait_on_buffer (ind_ubh);
	243	}
	244	ubh_brelse (ind_ubh);
	245
abf5d15f	246	UFSD("EXIT\n");
1da177e4 LT	247
	248	return retry;
	249	}
	250
	251	static int ufs_trunc_dindirect (struct inode inode, unsigned offset, __fs32 p)
	252	{
	253	struct super_block * sb;
	254	struct ufs_sb_private_info * uspi;
	255	struct ufs_buffer_head * dind_bh;
	256	unsigned i, tmp, dindirect_block;
	257	__fs32 * dind;
	258	int retry = 0;
	259
abf5d15f	260	UFSD("ENTER\n");
1da177e4 LT	261
	262	sb = inode->i_sb;
	263	uspi = UFS_SB(sb)->s_uspi;
	264
	265	dindirect_block = (DIRECT_BLOCK > offset)
	266	? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
	267	retry = 0;
	268
	269	tmp = fs32_to_cpu(sb, *p);
	270	if (!tmp)
	271	return 0;
	272	dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
	273	if (tmp != fs32_to_cpu(sb, *p)) {
	274	ubh_brelse (dind_bh);
	275	return 1;
	276	}
	277	if (!dind_bh) {
	278	*p = 0;
	279	return 0;
	280	}
	281
	282	for (i = dindirect_block ; i < uspi->s_apb ; i++) {
	283	dind = ubh_get_addr32 (dind_bh, i);
	284	tmp = fs32_to_cpu(sb, *dind);
	285	if (!tmp)
	286	continue;
	287	retry \|= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
	288	ubh_mark_buffer_dirty(dind_bh);
	289	}
	290
	291	for (i = 0; i < uspi->s_apb; i++)
	292	if (*ubh_get_addr32 (dind_bh, i))
	293	break;
	294	if (i >= uspi->s_apb) {
2061df0f ED	295	tmp = fs32_to_cpu(sb, *p);
2061df0f ED	296	*p = 0;
50aa4eb0 ED	297
50aa4eb0 ED	298	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	299	mark_inode_dirty(inode);
2061df0f ED	300	ubh_bforget(dind_bh);
2061df0f ED	301	dind_bh = NULL;
1da177e4 LT	302	}
1da177e4 LT	303	if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
098d5af7	304	ubh_ll_rw_block(SWRITE, dind_bh);
1da177e4 LT	305	ubh_wait_on_buffer (dind_bh);
	306	}
	307	ubh_brelse (dind_bh);
	308
abf5d15f	309	UFSD("EXIT\n");
1da177e4 LT	310
	311	return retry;
	312	}
	313
	314	static int ufs_trunc_tindirect (struct inode * inode)
	315	{
	316	struct ufs_inode_info *ufsi = UFS_I(inode);
	317	struct super_block * sb;
	318	struct ufs_sb_private_info * uspi;
	319	struct ufs_buffer_head * tind_bh;
	320	unsigned tindirect_block, tmp, i;
	321	__fs32 * tind, * p;
	322	int retry;
	323
abf5d15f	324	UFSD("ENTER\n");
1da177e4 LT	325
	326	sb = inode->i_sb;
	327	uspi = UFS_SB(sb)->s_uspi;
	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;
	332	p = ufsi->i_u1.i_data + UFS_TIND_BLOCK;
	333	if (!(tmp = fs32_to_cpu(sb, *p)))
	334	return 0;
	335	tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
	336	if (tmp != fs32_to_cpu(sb, *p)) {
	337	ubh_brelse (tind_bh);
	338	return 1;
	339	}
	340	if (!tind_bh) {
	341	*p = 0;
	342	return 0;
	343	}
	344
	345	for (i = tindirect_block ; i < uspi->s_apb ; i++) {
	346	tind = ubh_get_addr32 (tind_bh, i);
	347	retry \|= ufs_trunc_dindirect(inode, UFS_NDADDR +
	348	uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
	349	ubh_mark_buffer_dirty(tind_bh);
	350	}
	351	for (i = 0; i < uspi->s_apb; i++)
	352	if (*ubh_get_addr32 (tind_bh, i))
	353	break;
	354	if (i >= uspi->s_apb) {
2061df0f ED	355	tmp = fs32_to_cpu(sb, *p);
2061df0f ED	356	*p = 0;
50aa4eb0 ED	357
50aa4eb0 ED	358	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	359	mark_inode_dirty(inode);
2061df0f ED	360	ubh_bforget(tind_bh);
2061df0f ED	361	tind_bh = NULL;
1da177e4 LT	362	}
1da177e4 LT	363	if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
098d5af7	364	ubh_ll_rw_block(SWRITE, tind_bh);
1da177e4 LT	365	ubh_wait_on_buffer (tind_bh);
	366	}
	367	ubh_brelse (tind_bh);
	368
abf5d15f	369	UFSD("EXIT\n");
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 ED	375	int err = 0;
	376	struct address_space *mapping = inode->i_mapping;
	377	struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
10e5dce0 ED	378	unsigned lastfrag, i, end;
	379	struct page *lastpage;
	380	struct buffer_head *bh;
	381
	382	lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
	383
ecdc6394	384	if (!lastfrag)
10e5dce0	385	goto out;
ecdc6394	386
10e5dce0 ED	387	lastfrag--;
	388
	389	lastpage = ufs_get_locked_page(mapping, lastfrag >>
	390	(PAGE_CACHE_SHIFT - inode->i_blkbits));
	391	if (IS_ERR(lastpage)) {
	392	err = -EIO;
	393	goto out;
	394	}
	395
	396	end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
	397	bh = page_buffers(lastpage);
	398	for (i = 0; i < end; ++i)
	399	bh = bh->b_this_page;
	400
ecdc6394 ED	401
	402	err = ufs_getfrag_block(inode, lastfrag, bh, 1);
	403
	404	if (unlikely(err))
	405	goto out_unlock;
	406
	407	if (buffer_new(bh)) {
	408	clear_buffer_new(bh);
	409	unmap_underlying_metadata(bh->b_bdev,
	410	bh->b_blocknr);
	411	/*
	412	* we do not zeroize fragment, because of
	413	* if it maped to hole, it already contains zeroes
	414	*/
	415	set_buffer_uptodate(bh);
	416	mark_buffer_dirty(bh);
	417	set_page_dirty(lastpage);
10e5dce0	418	}
ecdc6394	419
10e5dce0 ED	420	out_unlock:
	421	ufs_put_locked_page(lastpage);
	422	out:
	423	return err;
	424	}
	425
	426	int ufs_truncate(struct inode *inode, loff_t old_i_size)
	427	{
	428	struct ufs_inode_info *ufsi = UFS_I(inode);
	429	struct super_block *sb = inode->i_sb;
	430	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	431	int retry, err = 0;
1da177e4	432
abf5d15f	433	UFSD("ENTER\n");
1da177e4	434
10e5dce0 ED	435	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	436	S_ISLNK(inode->i_mode)))
	437	return -EINVAL;
1da177e4	438	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
10e5dce0 ED	439	return -EPERM;
10e5dce0 ED	440
ecdc6394	441	err = ufs_alloc_lastblock(inode);
10e5dce0	442
ecdc6394 ED	443	if (err) {
	444	i_size_write(inode, old_i_size);
	445	goto out;
10e5dce0	446	}
09114eb8	447
10e5dce0	448	block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
09114eb8	449
1da177e4 LT	450	lock_kernel();
	451	while (1) {
	452	retry = ufs_trunc_direct(inode);
	453	retry \|= ufs_trunc_indirect (inode, UFS_IND_BLOCK,
	454	(__fs32 *) &ufsi->i_u1.i_data[UFS_IND_BLOCK]);
	455	retry \|= ufs_trunc_dindirect (inode, UFS_IND_BLOCK + uspi->s_apb,
	456	(__fs32 *) &ufsi->i_u1.i_data[UFS_DIND_BLOCK]);
	457	retry \|= ufs_trunc_tindirect (inode);
	458	if (!retry)
	459	break;
	460	if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
	461	ufs_sync_inode (inode);
	462	blk_run_address_space(inode->i_mapping);
	463	yield();
	464	}
09114eb8	465
1da177e4	466	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
ecdc6394	467	ufsi->i_lastfrag = DIRECT_FRAGMENT;
1da177e4 LT	468	unlock_kernel();
1da177e4 LT	469	mark_inode_dirty(inode);
10e5dce0 ED	470	out:
	471	UFSD("EXIT: err %d\n", err);
	472	return err;
1da177e4	473	}
10e5dce0 ED	474
	475
	476	/*
	477	* We don't define our `inode->i_op->truncate', and call it here,
	478	* because of:
	479	* - there is no way to know old size
	480	* - there is no way inform user about error, if it happens in `truncate'
	481	*/
	482	static int ufs_setattr(struct dentry dentry, struct iattr attr)
	483	{
	484	struct inode *inode = dentry->d_inode;
	485	unsigned int ia_valid = attr->ia_valid;
	486	int error;
	487
	488	error = inode_change_ok(inode, attr);
	489	if (error)
	490	return error;
	491
	492	if (ia_valid & ATTR_SIZE &&
	493	attr->ia_size != i_size_read(inode)) {
	494	loff_t old_i_size = inode->i_size;
	495	error = vmtruncate(inode, attr->ia_size);
	496	if (error)
	497	return error;
	498	error = ufs_truncate(inode, old_i_size);
	499	if (error)
	500	return error;
	501	}
	502	return inode_setattr(inode, attr);
	503	}
	504
	505	struct inode_operations ufs_file_inode_operations = {
	506	.setattr = ufs_setattr,
	507	};