[mirror_ubuntu-bionic-kernel.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/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;
	void *p;
	u64 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 %llu, frag2 %llu, block1 %llu, block2 %llu, frag3 %llu,"
	     " frag4 %llu\n",
	     (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\n");
	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\n");
	
	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\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 = 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\n");
	
	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\n");

	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_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 (!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\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 i, end;
	sector_t lastfrag;
	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: 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'
 */
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);
}

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>
	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	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
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;
54fb996a	94	} else if (frag2 < frag3) {
1da177e4 LT	95	block1 = ufs_fragstoblks (frag2);
	96	block2 = ufs_fragstoblks (frag3);
	97	}
	98
54fb996a ED	99	UFSD("frag1 %llu, frag2 %llu, block1 %llu, block2 %llu, frag3 %llu,"
	100	" frag4 %llu\n",
	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
abf5d15f	166	UFSD("EXIT\n");
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 LT	244	}
1da177e4 LT	245	if (IS_SYNC(inode) && ind_ubh && ubh_buffer_dirty(ind_ubh)) {
098d5af7	246	ubh_ll_rw_block(SWRITE, ind_ubh);
1da177e4 LT	247	ubh_wait_on_buffer (ind_ubh);
	248	}
	249	ubh_brelse (ind_ubh);
	250
abf5d15f	251	UFSD("EXIT\n");
1da177e4 LT	252
	253	return retry;
	254	}
	255
54fb996a	256	static int ufs_trunc_dindirect(struct inode inode, u64 offset, void p)
1da177e4 LT	257	{
	258	struct super_block * sb;
	259	struct ufs_sb_private_info * uspi;
54fb996a ED	260	struct ufs_buffer_head *dind_bh;
	261	u64 i, tmp, dindirect_block;
	262	void *dind;
1da177e4 LT	263	int retry = 0;
1da177e4 LT	264
abf5d15f	265	UFSD("ENTER\n");
1da177e4 LT	266
	267	sb = inode->i_sb;
	268	uspi = UFS_SB(sb)->s_uspi;
	269
	270	dindirect_block = (DIRECT_BLOCK > offset)
	271	? ((DIRECT_BLOCK - offset) >> uspi->s_apbshift) : 0;
	272	retry = 0;
	273
54fb996a	274	tmp = ufs_data_ptr_to_cpu(sb, p);
1da177e4 LT	275	if (!tmp)
	276	return 0;
	277	dind_bh = ubh_bread(sb, tmp, uspi->s_bsize);
54fb996a	278	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	279	ubh_brelse (dind_bh);
	280	return 1;
	281	}
	282	if (!dind_bh) {
54fb996a	283	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	284	return 0;
	285	}
	286
	287	for (i = dindirect_block ; i < uspi->s_apb ; i++) {
54fb996a ED	288	dind = ubh_get_data_ptr(uspi, dind_bh, i);
54fb996a ED	289	tmp = ufs_data_ptr_to_cpu(sb, dind);
1da177e4 LT	290	if (!tmp)
	291	continue;
	292	retry \|= ufs_trunc_indirect (inode, offset + (i << uspi->s_apbshift), dind);
	293	ubh_mark_buffer_dirty(dind_bh);
	294	}
	295
	296	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	297	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	298	ubh_get_data_ptr(uspi, dind_bh, i)))
1da177e4 LT	299	break;
1da177e4 LT	300	if (i >= uspi->s_apb) {
54fb996a ED	301	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	302	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	303
50aa4eb0 ED	304	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	305	mark_inode_dirty(inode);
2061df0f ED	306	ubh_bforget(dind_bh);
2061df0f ED	307	dind_bh = NULL;
1da177e4 LT	308	}
1da177e4 LT	309	if (IS_SYNC(inode) && dind_bh && ubh_buffer_dirty(dind_bh)) {
098d5af7	310	ubh_ll_rw_block(SWRITE, dind_bh);
1da177e4 LT	311	ubh_wait_on_buffer (dind_bh);
	312	}
	313	ubh_brelse (dind_bh);
	314
abf5d15f	315	UFSD("EXIT\n");
1da177e4 LT	316
	317	return retry;
	318	}
	319
54fb996a	320	static int ufs_trunc_tindirect(struct inode *inode)
1da177e4	321	{
54fb996a ED	322	struct super_block *sb = inode->i_sb;
54fb996a ED	323	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
1da177e4	324	struct ufs_inode_info *ufsi = UFS_I(inode);
1da177e4	325	struct ufs_buffer_head * tind_bh;
54fb996a ED	326	u64 tindirect_block, tmp, i;
54fb996a ED	327	void tind, p;
1da177e4 LT	328	int retry;
1da177e4 LT	329
abf5d15f	330	UFSD("ENTER\n");
1da177e4	331
1da177e4 LT	332	retry = 0;
	333
	334	tindirect_block = (DIRECT_BLOCK > (UFS_NDADDR + uspi->s_apb + uspi->s_2apb))
	335	? ((DIRECT_BLOCK - UFS_NDADDR - uspi->s_apb - uspi->s_2apb) >> uspi->s_2apbshift) : 0;
54fb996a ED	336
	337	p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK);
	338	if (!(tmp = ufs_data_ptr_to_cpu(sb, p)))
1da177e4 LT	339	return 0;
1da177e4 LT	340	tind_bh = ubh_bread (sb, tmp, uspi->s_bsize);
54fb996a	341	if (tmp != ufs_data_ptr_to_cpu(sb, p)) {
1da177e4 LT	342	ubh_brelse (tind_bh);
	343	return 1;
	344	}
	345	if (!tind_bh) {
54fb996a	346	ufs_data_ptr_clear(uspi, p);
1da177e4 LT	347	return 0;
	348	}
	349
	350	for (i = tindirect_block ; i < uspi->s_apb ; i++) {
	351	tind = ubh_get_addr32 (tind_bh, i);
	352	retry \|= ufs_trunc_dindirect(inode, UFS_NDADDR +
	353	uspi->s_apb + ((i + 1) << uspi->s_2apbshift), tind);
	354	ubh_mark_buffer_dirty(tind_bh);
	355	}
	356	for (i = 0; i < uspi->s_apb; i++)
54fb996a ED	357	if (!ufs_is_data_ptr_zero(uspi,
54fb996a ED	358	ubh_get_data_ptr(uspi, tind_bh, i)))
1da177e4 LT	359	break;
1da177e4 LT	360	if (i >= uspi->s_apb) {
54fb996a ED	361	tmp = ufs_data_ptr_to_cpu(sb, p);
54fb996a ED	362	ufs_data_ptr_clear(uspi, p);
50aa4eb0 ED	363
50aa4eb0 ED	364	ufs_free_blocks(inode, tmp, uspi->s_fpb);
2061df0f	365	mark_inode_dirty(inode);
2061df0f ED	366	ubh_bforget(tind_bh);
2061df0f ED	367	tind_bh = NULL;
1da177e4 LT	368	}
1da177e4 LT	369	if (IS_SYNC(inode) && tind_bh && ubh_buffer_dirty(tind_bh)) {
098d5af7	370	ubh_ll_rw_block(SWRITE, tind_bh);
1da177e4 LT	371	ubh_wait_on_buffer (tind_bh);
	372	}
	373	ubh_brelse (tind_bh);
	374
abf5d15f	375	UFSD("EXIT\n");
1da177e4 LT	376	return retry;
1da177e4 LT	377	}
10e5dce0 ED	378
10e5dce0 ED	379	static int ufs_alloc_lastblock(struct inode *inode)
1da177e4	380	{
10e5dce0 ED	381	int err = 0;
	382	struct address_space *mapping = inode->i_mapping;
	383	struct ufs_sb_private_info *uspi = UFS_SB(inode->i_sb)->s_uspi;
54fb996a ED	384	unsigned i, end;
54fb996a ED	385	sector_t lastfrag;
10e5dce0 ED	386	struct page *lastpage;
	387	struct buffer_head *bh;
	388
	389	lastfrag = (i_size_read(inode) + uspi->s_fsize - 1) >> uspi->s_fshift;
	390
ecdc6394	391	if (!lastfrag)
10e5dce0	392	goto out;
ecdc6394	393
10e5dce0 ED	394	lastfrag--;
	395
	396	lastpage = ufs_get_locked_page(mapping, lastfrag >>
	397	(PAGE_CACHE_SHIFT - inode->i_blkbits));
	398	if (IS_ERR(lastpage)) {
	399	err = -EIO;
	400	goto out;
	401	}
	402
	403	end = lastfrag & ((1 << (PAGE_CACHE_SHIFT - inode->i_blkbits)) - 1);
	404	bh = page_buffers(lastpage);
	405	for (i = 0; i < end; ++i)
	406	bh = bh->b_this_page;
	407
ecdc6394 ED	408
	409	err = ufs_getfrag_block(inode, lastfrag, bh, 1);
	410
	411	if (unlikely(err))
	412	goto out_unlock;
	413
	414	if (buffer_new(bh)) {
	415	clear_buffer_new(bh);
	416	unmap_underlying_metadata(bh->b_bdev,
	417	bh->b_blocknr);
	418	/*
	419	* we do not zeroize fragment, because of
	420	* if it maped to hole, it already contains zeroes
	421	*/
	422	set_buffer_uptodate(bh);
	423	mark_buffer_dirty(bh);
	424	set_page_dirty(lastpage);
10e5dce0	425	}
ecdc6394	426
10e5dce0 ED	427	out_unlock:
	428	ufs_put_locked_page(lastpage);
	429	out:
	430	return err;
	431	}
	432
	433	int ufs_truncate(struct inode *inode, loff_t old_i_size)
	434	{
	435	struct ufs_inode_info *ufsi = UFS_I(inode);
	436	struct super_block *sb = inode->i_sb;
	437	struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
	438	int retry, err = 0;
1da177e4	439
54fb996a ED	440	UFSD("ENTER: ino %lu, i_size: %llu, old_i_size: %llu\n",
	441	inode->i_ino, (unsigned long long)i_size_read(inode),
	442	(unsigned long long)old_i_size);
1da177e4	443
10e5dce0 ED	444	if (!(S_ISREG(inode->i_mode) \|\| S_ISDIR(inode->i_mode) \|\|
	445	S_ISLNK(inode->i_mode)))
	446	return -EINVAL;
1da177e4	447	if (IS_APPEND(inode) \|\| IS_IMMUTABLE(inode))
10e5dce0 ED	448	return -EPERM;
10e5dce0 ED	449
ecdc6394	450	err = ufs_alloc_lastblock(inode);
10e5dce0	451
ecdc6394 ED	452	if (err) {
	453	i_size_write(inode, old_i_size);
	454	goto out;
10e5dce0	455	}
09114eb8	456
10e5dce0	457	block_truncate_page(inode->i_mapping, inode->i_size, ufs_getfrag_block);
09114eb8	458
1da177e4 LT	459	lock_kernel();
	460	while (1) {
	461	retry = ufs_trunc_direct(inode);
54fb996a ED	462	retry \|= ufs_trunc_indirect(inode, UFS_IND_BLOCK,
	463	ufs_get_direct_data_ptr(uspi, ufsi,
	464	UFS_IND_BLOCK));
	465	retry \|= ufs_trunc_dindirect(inode, UFS_IND_BLOCK + uspi->s_apb,
	466	ufs_get_direct_data_ptr(uspi, ufsi,
	467	UFS_DIND_BLOCK));
1da177e4 LT	468	retry \|= ufs_trunc_tindirect (inode);
	469	if (!retry)
	470	break;
	471	if (IS_SYNC(inode) && (inode->i_state & I_DIRTY))
	472	ufs_sync_inode (inode);
	473	blk_run_address_space(inode->i_mapping);
	474	yield();
	475	}
09114eb8	476
1da177e4	477	inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
ecdc6394	478	ufsi->i_lastfrag = DIRECT_FRAGMENT;
1da177e4 LT	479	unlock_kernel();
1da177e4 LT	480	mark_inode_dirty(inode);
10e5dce0 ED	481	out:
	482	UFSD("EXIT: err %d\n", err);
	483	return err;
1da177e4	484	}
10e5dce0 ED	485
	486
	487	/*
	488	* We don't define our `inode->i_op->truncate', and call it here,
	489	* because of:
	490	* - there is no way to know old size
	491	* - there is no way inform user about error, if it happens in `truncate'
	492	*/
	493	static int ufs_setattr(struct dentry dentry, struct iattr attr)
	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
	503	if (ia_valid & ATTR_SIZE &&
	504	attr->ia_size != i_size_read(inode)) {
	505	loff_t old_i_size = inode->i_size;
	506	error = vmtruncate(inode, attr->ia_size);
	507	if (error)
	508	return error;
	509	error = ufs_truncate(inode, old_i_size);
	510	if (error)
	511	return error;
	512	}
	513	return inode_setattr(inode, attr);
	514	}
	515
c5ef1c42	516	const struct inode_operations ufs_file_inode_operations = {
10e5dce0 ED	517	.setattr = ufs_setattr,
10e5dce0 ED	518	};