[linux.git] / fs / omfs / file.c

/*
 * OMFS (as used by RIO Karma) file operations.
 * Copyright (C) 2005 Bob Copeland <[email protected]>
 * Released under GPL v2.
 */

#include <linux/module.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/mpage.h>
#include "omfs.h"

static u32 omfs_max_extents(struct omfs_sb_info *sbi, int offset)
{
	return (sbi->s_sys_blocksize - offset -
		sizeof(struct omfs_extent)) /
		sizeof(struct omfs_extent_entry) + 1;
}

void omfs_make_empty_table(struct buffer_head *bh, int offset)
{
	struct omfs_extent *oe = (struct omfs_extent *) &bh->b_data[offset];

	oe->e_next = ~cpu_to_be64(0ULL);
	oe->e_extent_count = cpu_to_be32(1),
	oe->e_fill = cpu_to_be32(0x22),
	oe->e_entry.e_cluster = ~cpu_to_be64(0ULL);
	oe->e_entry.e_blocks = ~cpu_to_be64(0ULL);
}

int omfs_shrink_inode(struct inode *inode)
{
	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	struct omfs_extent *oe;
	struct omfs_extent_entry *entry;
	struct buffer_head *bh;
	u64 next, last;
	u32 extent_count;
	u32 max_extents;
	int ret;

	/* traverse extent table, freeing each entry that is greater
	 * than inode->i_size;
	 */
	next = inode->i_ino;

	/* only support truncate -> 0 for now */
	ret = -EIO;
	if (inode->i_size != 0)
		goto out;

	bh = omfs_bread(inode->i_sb, next);
	if (!bh)
		goto out;

	oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
	max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);

	for (;;) {

		if (omfs_is_bad(sbi, (struct omfs_header *) bh->b_data, next))
			goto out_brelse;

		extent_count = be32_to_cpu(oe->e_extent_count);

		if (extent_count > max_extents)
			goto out_brelse;

		last = next;
		next = be64_to_cpu(oe->e_next);
		entry = &oe->e_entry;

		/* ignore last entry as it is the terminator */
		for (; extent_count > 1; extent_count--) {
			u64 start, count;
			start = be64_to_cpu(entry->e_cluster);
			count = be64_to_cpu(entry->e_blocks);

			omfs_clear_range(inode->i_sb, start, (int) count);
			entry++;
		}
		omfs_make_empty_table(bh, (char *) oe - bh->b_data);
		mark_buffer_dirty(bh);
		brelse(bh);

		if (last != inode->i_ino)
			omfs_clear_range(inode->i_sb, last, sbi->s_mirrors);

		if (next == ~0)
			break;

		bh = omfs_bread(inode->i_sb, next);
		if (!bh)
			goto out;
		oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
		max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
	}
	ret = 0;
out:
	return ret;
out_brelse:
	brelse(bh);
	return ret;
}

static void omfs_truncate(struct inode *inode)
{
	omfs_shrink_inode(inode);
	mark_inode_dirty(inode);
}

/*
 * Add new blocks to the current extent, or create new entries/continuations
 * as necessary.
 */
static int omfs_grow_extent(struct inode *inode, struct omfs_extent *oe,
			u64 *ret_block)
{
	struct omfs_extent_entry *terminator;
	struct omfs_extent_entry *entry = &oe->e_entry;
	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	u32 extent_count = be32_to_cpu(oe->e_extent_count);
	u64 new_block = 0;
	u32 max_count;
	int new_count;
	int ret = 0;

	/* reached the end of the extent table with no blocks mapped.
	 * there are three possibilities for adding: grow last extent,
	 * add a new extent to the current extent table, and add a
	 * continuation inode.  in last two cases need an allocator for
	 * sbi->s_cluster_size
	 */

	/* TODO: handle holes */

	/* should always have a terminator */
	if (extent_count < 1)
		return -EIO;

	/* trivially grow current extent, if next block is not taken */
	terminator = entry + extent_count - 1;
	if (extent_count > 1) {
		entry = terminator-1;
		new_block = be64_to_cpu(entry->e_cluster) +
			be64_to_cpu(entry->e_blocks);

		if (omfs_allocate_block(inode->i_sb, new_block)) {
			be64_add_cpu(&entry->e_blocks, 1);
			terminator->e_blocks = ~(cpu_to_be64(
				be64_to_cpu(~terminator->e_blocks) + 1));
			goto out;
		}
	}
	max_count = omfs_max_extents(sbi, OMFS_EXTENT_START);

	/* TODO: add a continuation block here */
	if (be32_to_cpu(oe->e_extent_count) > max_count-1)
		return -EIO;

	/* try to allocate a new cluster */
	ret = omfs_allocate_range(inode->i_sb, 1, sbi->s_clustersize,
		&new_block, &new_count);
	if (ret)
		goto out_fail;

	/* copy terminator down an entry */
	entry = terminator;
	terminator++;
	memcpy(terminator, entry, sizeof(struct omfs_extent_entry));

	entry->e_cluster = cpu_to_be64(new_block);
	entry->e_blocks = cpu_to_be64((u64) new_count);

	terminator->e_blocks = ~(cpu_to_be64(
		be64_to_cpu(~terminator->e_blocks) + (u64) new_count));

	/* write in new entry */
	be32_add_cpu(&oe->e_extent_count, 1);

out:
	*ret_block = new_block;
out_fail:
	return ret;
}

/*
 * Scans across the directory table for a given file block number.
 * If block not found, return 0.
 */
static sector_t find_block(struct inode *inode, struct omfs_extent_entry *ent,
			sector_t block, int count, int *left)
{
	/* count > 1 because of terminator */
	sector_t searched = 0;
	for (; count > 1; count--) {
		int numblocks = clus_to_blk(OMFS_SB(inode->i_sb),
			be64_to_cpu(ent->e_blocks));

		if (block >= searched  &&
		    block < searched + numblocks) {
			/*
			 * found it at cluster + (block - searched)
			 * numblocks - (block - searched) is remainder
			 */
			*left = numblocks - (block - searched);
			return clus_to_blk(OMFS_SB(inode->i_sb),
				be64_to_cpu(ent->e_cluster)) +
				block - searched;
		}
		searched += numblocks;
		ent++;
	}
	return 0;
}

static int omfs_get_block(struct inode *inode, sector_t block,
			  struct buffer_head *bh_result, int create)
{
	struct buffer_head *bh;
	sector_t next, offset;
	int ret;
	u64 uninitialized_var(new_block);
	u32 max_extents;
	int extent_count;
	struct omfs_extent *oe;
	struct omfs_extent_entry *entry;
	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	int max_blocks = bh_result->b_size >> inode->i_blkbits;
	int remain;

	ret = -EIO;
	bh = omfs_bread(inode->i_sb, inode->i_ino);
	if (!bh)
		goto out;

	oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
	max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);
	next = inode->i_ino;

	for (;;) {

		if (omfs_is_bad(sbi, (struct omfs_header *) bh->b_data, next))
			goto out_brelse;

		extent_count = be32_to_cpu(oe->e_extent_count);
		next = be64_to_cpu(oe->e_next);
		entry = &oe->e_entry;

		if (extent_count > max_extents)
			goto out_brelse;

		offset = find_block(inode, entry, block, extent_count, &remain);
		if (offset > 0) {
			ret = 0;
			map_bh(bh_result, inode->i_sb, offset);
			if (remain > max_blocks)
				remain = max_blocks;
			bh_result->b_size = (remain << inode->i_blkbits);
			goto out_brelse;
		}
		if (next == ~0)
			break;

		brelse(bh);
		bh = omfs_bread(inode->i_sb, next);
		if (!bh)
			goto out;
		oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
		max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
	}
	if (create) {
		ret = omfs_grow_extent(inode, oe, &new_block);
		if (ret == 0) {
			mark_buffer_dirty(bh);
			mark_inode_dirty(inode);
			map_bh(bh_result, inode->i_sb,
					clus_to_blk(sbi, new_block));
		}
	}
out_brelse:
	brelse(bh);
out:
	return ret;
}

static int omfs_readpage(struct file *file, struct page *page)
{
	return block_read_full_page(page, omfs_get_block);
}

static int omfs_readpages(struct file *file, struct address_space *mapping,
		struct list_head *pages, unsigned nr_pages)
{
	return mpage_readpages(mapping, pages, nr_pages, omfs_get_block);
}

static int omfs_writepage(struct page *page, struct writeback_control *wbc)
{
	return block_write_full_page(page, omfs_get_block, wbc);
}

static int
omfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
{
	return mpage_writepages(mapping, wbc, omfs_get_block);
}

static void omfs_write_failed(struct address_space *mapping, loff_t to)
{
	struct inode *inode = mapping->host;

	if (to > inode->i_size) {
		truncate_pagecache(inode, to, inode->i_size);
		omfs_truncate(inode);
	}
}

static int omfs_write_begin(struct file *file, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	int ret;

	ret = block_write_begin(mapping, pos, len, flags, pagep,
				omfs_get_block);
	if (unlikely(ret))
		omfs_write_failed(mapping, pos + len);

	return ret;
}

static sector_t omfs_bmap(struct address_space *mapping, sector_t block)
{
	return generic_block_bmap(mapping, block, omfs_get_block);
}

const struct file_operations omfs_file_operations = {
	.llseek = generic_file_llseek,
	.read = do_sync_read,
	.write = do_sync_write,
	.aio_read = generic_file_aio_read,
	.aio_write = generic_file_aio_write,
	.mmap = generic_file_mmap,
	.fsync = generic_file_fsync,
	.splice_read = generic_file_splice_read,
};

static int omfs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	int error;

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

	if ((attr->ia_valid & ATTR_SIZE) &&
	    attr->ia_size != i_size_read(inode)) {
		error = inode_newsize_ok(inode, attr->ia_size);
		if (error)
			return error;
		truncate_setsize(inode, attr->ia_size);
		omfs_truncate(inode);
	}

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

const struct inode_operations omfs_file_inops = {
	.setattr = omfs_setattr,
};

const struct address_space_operations omfs_aops = {
	.readpage = omfs_readpage,
	.readpages = omfs_readpages,
	.writepage = omfs_writepage,
	.writepages = omfs_writepages,
	.write_begin = omfs_write_begin,
	.write_end = generic_write_end,
	.bmap = omfs_bmap,
};
Commit	Line	Data
8f09e987 BC	1	/*
	2	* OMFS (as used by RIO Karma) file operations.
	3	* Copyright (C) 2005 Bob Copeland <[email protected]>
	4	* Released under GPL v2.
	5	*/
	6
8f09e987 BC	7	#include <linux/module.h>
	8	#include <linux/fs.h>
	9	#include <linux/buffer_head.h>
	10	#include <linux/mpage.h>
	11	#include "omfs.h"
	12
9419fc1c BC	13	static u32 omfs_max_extents(struct omfs_sb_info *sbi, int offset)
	14	{
	15	return (sbi->s_sys_blocksize - offset -
	16	sizeof(struct omfs_extent)) /
	17	sizeof(struct omfs_extent_entry) + 1;
	18	}
	19
8f09e987 BC	20	void omfs_make_empty_table(struct buffer_head *bh, int offset)
	21	{
	22	struct omfs_extent oe = (struct omfs_extent ) &bh->b_data[offset];
	23
d406f66d	24	oe->e_next = ~cpu_to_be64(0ULL);
8f09e987 BC	25	oe->e_extent_count = cpu_to_be32(1),
8f09e987 BC	26	oe->e_fill = cpu_to_be32(0x22),
d406f66d HH	27	oe->e_entry.e_cluster = ~cpu_to_be64(0ULL);
d406f66d HH	28	oe->e_entry.e_blocks = ~cpu_to_be64(0ULL);
8f09e987 BC	29	}
	30
	31	int omfs_shrink_inode(struct inode *inode)
	32	{
	33	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	34	struct omfs_extent *oe;
	35	struct omfs_extent_entry *entry;
	36	struct buffer_head *bh;
	37	u64 next, last;
	38	u32 extent_count;
9419fc1c	39	u32 max_extents;
8f09e987 BC	40	int ret;
	41
	42	/* traverse extent table, freeing each entry that is greater
	43	* than inode->i_size;
	44	*/
	45	next = inode->i_ino;
	46
	47	/* only support truncate -> 0 for now */
	48	ret = -EIO;
	49	if (inode->i_size != 0)
	50	goto out;
	51
f068272c	52	bh = omfs_bread(inode->i_sb, next);
8f09e987 BC	53	if (!bh)
	54	goto out;
	55
	56	oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
9419fc1c	57	max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);
8f09e987 BC	58
	59	for (;;) {
	60
9419fc1c BC	61	if (omfs_is_bad(sbi, (struct omfs_header *) bh->b_data, next))
9419fc1c BC	62	goto out_brelse;
8f09e987 BC	63
8f09e987 BC	64	extent_count = be32_to_cpu(oe->e_extent_count);
9419fc1c BC	65
	66	if (extent_count > max_extents)
	67	goto out_brelse;
	68
8f09e987 BC	69	last = next;
	70	next = be64_to_cpu(oe->e_next);
	71	entry = &oe->e_entry;
	72
	73	/* ignore last entry as it is the terminator */
	74	for (; extent_count > 1; extent_count--) {
	75	u64 start, count;
	76	start = be64_to_cpu(entry->e_cluster);
	77	count = be64_to_cpu(entry->e_blocks);
	78
	79	omfs_clear_range(inode->i_sb, start, (int) count);
	80	entry++;
	81	}
	82	omfs_make_empty_table(bh, (char *) oe - bh->b_data);
	83	mark_buffer_dirty(bh);
	84	brelse(bh);
	85
	86	if (last != inode->i_ino)
	87	omfs_clear_range(inode->i_sb, last, sbi->s_mirrors);
	88
	89	if (next == ~0)
	90	break;
	91
f068272c	92	bh = omfs_bread(inode->i_sb, next);
8f09e987 BC	93	if (!bh)
	94	goto out;
	95	oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
9419fc1c	96	max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
8f09e987 BC	97	}
	98	ret = 0;
	99	out:
	100	return ret;
9419fc1c BC	101	out_brelse:
	102	brelse(bh);
	103	return ret;
8f09e987 BC	104	}
	105
	106	static void omfs_truncate(struct inode *inode)
	107	{
	108	omfs_shrink_inode(inode);
	109	mark_inode_dirty(inode);
	110	}
	111
	112	/*
	113	* Add new blocks to the current extent, or create new entries/continuations
	114	* as necessary.
	115	*/
	116	static int omfs_grow_extent(struct inode inode, struct omfs_extent oe,
	117	u64 *ret_block)
	118	{
	119	struct omfs_extent_entry *terminator;
	120	struct omfs_extent_entry *entry = &oe->e_entry;
	121	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	122	u32 extent_count = be32_to_cpu(oe->e_extent_count);
	123	u64 new_block = 0;
	124	u32 max_count;
	125	int new_count;
	126	int ret = 0;
	127
	128	/* reached the end of the extent table with no blocks mapped.
	129	* there are three possibilities for adding: grow last extent,
	130	* add a new extent to the current extent table, and add a
	131	* continuation inode. in last two cases need an allocator for
	132	* sbi->s_cluster_size
	133	*/
	134
	135	/* TODO: handle holes */
	136
	137	/* should always have a terminator */
	138	if (extent_count < 1)
	139	return -EIO;
	140
	141	/* trivially grow current extent, if next block is not taken */
	142	terminator = entry + extent_count - 1;
	143	if (extent_count > 1) {
	144	entry = terminator-1;
	145	new_block = be64_to_cpu(entry->e_cluster) +
	146	be64_to_cpu(entry->e_blocks);
	147
	148	if (omfs_allocate_block(inode->i_sb, new_block)) {
c99b6841	149	be64_add_cpu(&entry->e_blocks, 1);
8f09e987 BC	150	terminator->e_blocks = ~(cpu_to_be64(
	151	be64_to_cpu(~terminator->e_blocks) + 1));
	152	goto out;
	153	}
	154	}
9419fc1c	155	max_count = omfs_max_extents(sbi, OMFS_EXTENT_START);
8f09e987 BC	156
	157	/* TODO: add a continuation block here */
	158	if (be32_to_cpu(oe->e_extent_count) > max_count-1)
	159	return -EIO;
	160
	161	/* try to allocate a new cluster */
	162	ret = omfs_allocate_range(inode->i_sb, 1, sbi->s_clustersize,
	163	&new_block, &new_count);
	164	if (ret)
	165	goto out_fail;
	166
	167	/* copy terminator down an entry */
	168	entry = terminator;
	169	terminator++;
	170	memcpy(terminator, entry, sizeof(struct omfs_extent_entry));
	171
	172	entry->e_cluster = cpu_to_be64(new_block);
	173	entry->e_blocks = cpu_to_be64((u64) new_count);
	174
	175	terminator->e_blocks = ~(cpu_to_be64(
	176	be64_to_cpu(~terminator->e_blocks) + (u64) new_count));
	177
	178	/* write in new entry */
c99b6841	179	be32_add_cpu(&oe->e_extent_count, 1);
8f09e987 BC	180
	181	out:
	182	*ret_block = new_block;
	183	out_fail:
	184	return ret;
	185	}
	186
	187	/*
	188	* Scans across the directory table for a given file block number.
	189	* If block not found, return 0.
	190	*/
	191	static sector_t find_block(struct inode inode, struct omfs_extent_entry ent,
	192	sector_t block, int count, int *left)
	193	{
	194	/* count > 1 because of terminator */
	195	sector_t searched = 0;
	196	for (; count > 1; count--) {
	197	int numblocks = clus_to_blk(OMFS_SB(inode->i_sb),
	198	be64_to_cpu(ent->e_blocks));
	199
	200	if (block >= searched &&
	201	block < searched + numblocks) {
	202	/*
	203	* found it at cluster + (block - searched)
	204	* numblocks - (block - searched) is remainder
	205	*/
	206	*left = numblocks - (block - searched);
	207	return clus_to_blk(OMFS_SB(inode->i_sb),
	208	be64_to_cpu(ent->e_cluster)) +
	209	block - searched;
	210	}
	211	searched += numblocks;
	212	ent++;
	213	}
	214	return 0;
	215	}
	216
	217	static int omfs_get_block(struct inode *inode, sector_t block,
	218	struct buffer_head *bh_result, int create)
	219	{
	220	struct buffer_head *bh;
	221	sector_t next, offset;
	222	int ret;
ffc18879	223	u64 uninitialized_var(new_block);
9419fc1c	224	u32 max_extents;
8f09e987 BC	225	int extent_count;
	226	struct omfs_extent *oe;
	227	struct omfs_extent_entry *entry;
	228	struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
	229	int max_blocks = bh_result->b_size >> inode->i_blkbits;
	230	int remain;
	231
	232	ret = -EIO;
f068272c	233	bh = omfs_bread(inode->i_sb, inode->i_ino);
8f09e987 BC	234	if (!bh)
	235	goto out;
	236
	237	oe = (struct omfs_extent *)(&bh->b_data[OMFS_EXTENT_START]);
9419fc1c	238	max_extents = omfs_max_extents(sbi, OMFS_EXTENT_START);
8f09e987 BC	239	next = inode->i_ino;
	240
	241	for (;;) {
	242
	243	if (omfs_is_bad(sbi, (struct omfs_header *) bh->b_data, next))
	244	goto out_brelse;
	245
	246	extent_count = be32_to_cpu(oe->e_extent_count);
	247	next = be64_to_cpu(oe->e_next);
	248	entry = &oe->e_entry;
	249
9419fc1c BC	250	if (extent_count > max_extents)
	251	goto out_brelse;
	252
8f09e987 BC	253	offset = find_block(inode, entry, block, extent_count, &remain);
	254	if (offset > 0) {
	255	ret = 0;
	256	map_bh(bh_result, inode->i_sb, offset);
	257	if (remain > max_blocks)
	258	remain = max_blocks;
	259	bh_result->b_size = (remain << inode->i_blkbits);
	260	goto out_brelse;
	261	}
	262	if (next == ~0)
	263	break;
	264
	265	brelse(bh);
f068272c	266	bh = omfs_bread(inode->i_sb, next);
8f09e987 BC	267	if (!bh)
	268	goto out;
	269	oe = (struct omfs_extent *) (&bh->b_data[OMFS_EXTENT_CONT]);
9419fc1c	270	max_extents = omfs_max_extents(sbi, OMFS_EXTENT_CONT);
8f09e987 BC	271	}
	272	if (create) {
	273	ret = omfs_grow_extent(inode, oe, &new_block);
	274	if (ret == 0) {
	275	mark_buffer_dirty(bh);
	276	mark_inode_dirty(inode);
	277	map_bh(bh_result, inode->i_sb,
	278	clus_to_blk(sbi, new_block));
	279	}
	280	}
	281	out_brelse:
	282	brelse(bh);
	283	out:
	284	return ret;
	285	}
	286
	287	static int omfs_readpage(struct file file, struct page page)
	288	{
	289	return block_read_full_page(page, omfs_get_block);
	290	}
	291
	292	static int omfs_readpages(struct file file, struct address_space mapping,
	293	struct list_head *pages, unsigned nr_pages)
	294	{
	295	return mpage_readpages(mapping, pages, nr_pages, omfs_get_block);
	296	}
	297
	298	static int omfs_writepage(struct page page, struct writeback_control wbc)
	299	{
	300	return block_write_full_page(page, omfs_get_block, wbc);
	301	}
	302
	303	static int
	304	omfs_writepages(struct address_space mapping, struct writeback_control wbc)
	305	{
	306	return mpage_writepages(mapping, wbc, omfs_get_block);
	307	}
	308
a8f5293a MS	309	static void omfs_write_failed(struct address_space *mapping, loff_t to)
	310	{
	311	struct inode *inode = mapping->host;
	312
	313	if (to > inode->i_size) {
	314	truncate_pagecache(inode, to, inode->i_size);
	315	omfs_truncate(inode);
	316	}
	317	}
	318
8f09e987 BC	319	static int omfs_write_begin(struct file file, struct address_space mapping,
	320	loff_t pos, unsigned len, unsigned flags,
	321	struct page pagep, void fsdata)
	322	{
155130a4 CH	323	int ret;
	324
	325	ret = block_write_begin(mapping, pos, len, flags, pagep,
	326	omfs_get_block);
a8f5293a MS	327	if (unlikely(ret))
a8f5293a MS	328	omfs_write_failed(mapping, pos + len);
155130a4 CH	329
155130a4 CH	330	return ret;
8f09e987 BC	331	}
	332
	333	static sector_t omfs_bmap(struct address_space *mapping, sector_t block)
	334	{
	335	return generic_block_bmap(mapping, block, omfs_get_block);
	336	}
	337
828c0950	338	const struct file_operations omfs_file_operations = {
8f09e987 BC	339	.llseek = generic_file_llseek,
	340	.read = do_sync_read,
	341	.write = do_sync_write,
	342	.aio_read = generic_file_aio_read,
	343	.aio_write = generic_file_aio_write,
	344	.mmap = generic_file_mmap,
1b061d92	345	.fsync = generic_file_fsync,
8f09e987 BC	346	.splice_read = generic_file_splice_read,
	347	};
	348
d39aae9e CH	349	static int omfs_setattr(struct dentry dentry, struct iattr attr)
	350	{
	351	struct inode *inode = dentry->d_inode;
	352	int error;
	353
	354	error = inode_change_ok(inode, attr);
	355	if (error)
	356	return error;
1025774c CH	357
	358	if ((attr->ia_valid & ATTR_SIZE) &&
	359	attr->ia_size != i_size_read(inode)) {
a8f5293a	360	error = inode_newsize_ok(inode, attr->ia_size);
1025774c CH	361	if (error)
1025774c CH	362	return error;
a8f5293a MS	363	truncate_setsize(inode, attr->ia_size);
a8f5293a MS	364	omfs_truncate(inode);
1025774c CH	365	}
	366
	367	setattr_copy(inode, attr);
	368	mark_inode_dirty(inode);
	369	return 0;
d39aae9e CH	370	}
d39aae9e CH	371
6e1d5dcc	372	const struct inode_operations omfs_file_inops = {
d39aae9e	373	.setattr = omfs_setattr,
8f09e987 BC	374	};
8f09e987 BC	375
7f09410b	376	const struct address_space_operations omfs_aops = {
8f09e987 BC	377	.readpage = omfs_readpage,
	378	.readpages = omfs_readpages,
	379	.writepage = omfs_writepage,
	380	.writepages = omfs_writepages,
8f09e987 BC	381	.write_begin = omfs_write_begin,
	382	.write_end = generic_write_end,
	383	.bmap = omfs_bmap,
	384	};
	385