[linux-2.6-block.git] / fs / iomap / fiemap.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2016-2021 Christoph Hellwig.
 */
#include <linux/module.h>
#include <linux/compiler.h>
#include <linux/fs.h>
#include <linux/iomap.h>
#include <linux/fiemap.h>

static int iomap_to_fiemap(struct fiemap_extent_info *fi,
		const struct iomap *iomap, u32 flags)
{
	switch (iomap->type) {
	case IOMAP_HOLE:
		/* skip holes */
		return 0;
	case IOMAP_DELALLOC:
		flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN;
		break;
	case IOMAP_MAPPED:
		break;
	case IOMAP_UNWRITTEN:
		flags |= FIEMAP_EXTENT_UNWRITTEN;
		break;
	case IOMAP_INLINE:
		flags |= FIEMAP_EXTENT_DATA_INLINE;
		break;
	}

	if (iomap->flags & IOMAP_F_MERGED)
		flags |= FIEMAP_EXTENT_MERGED;
	if (iomap->flags & IOMAP_F_SHARED)
		flags |= FIEMAP_EXTENT_SHARED;

	return fiemap_fill_next_extent(fi, iomap->offset,
			iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
			iomap->length, flags);
}

static loff_t iomap_fiemap_iter(const struct iomap_iter *iter,
		struct fiemap_extent_info *fi, struct iomap *prev)
{
	int ret;

	if (iter->iomap.type == IOMAP_HOLE)
		return iomap_length(iter);

	ret = iomap_to_fiemap(fi, prev, 0);
	*prev = iter->iomap;
	switch (ret) {
	case 0:		/* success */
		return iomap_length(iter);
	case 1:		/* extent array full */
		return 0;
	default:	/* error */
		return ret;
	}
}

int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
		u64 start, u64 len, const struct iomap_ops *ops)
{
	struct iomap_iter iter = {
		.inode		= inode,
		.pos		= start,
		.len		= len,
		.flags		= IOMAP_REPORT,
	};
	struct iomap prev = {
		.type		= IOMAP_HOLE,
	};
	int ret;

	ret = fiemap_prep(inode, fi, start, &iter.len, 0);
	if (ret)
		return ret;

	while ((ret = iomap_iter(&iter, ops)) > 0)
		iter.processed = iomap_fiemap_iter(&iter, fi, &prev);

	if (prev.type != IOMAP_HOLE) {
		ret = iomap_to_fiemap(fi, &prev, FIEMAP_EXTENT_LAST);
		if (ret < 0)
			return ret;
	}

	/* inode with no (attribute) mapping will give ENOENT */
	if (ret < 0 && ret != -ENOENT)
		return ret;
	return 0;
}
EXPORT_SYMBOL_GPL(iomap_fiemap);

/* legacy ->bmap interface.  0 is the error return (!) */
sector_t
iomap_bmap(struct address_space *mapping, sector_t bno,
		const struct iomap_ops *ops)
{
	struct iomap_iter iter = {
		.inode	= mapping->host,
		.pos	= (loff_t)bno << mapping->host->i_blkbits,
		.len	= i_blocksize(mapping->host),
		.flags	= IOMAP_REPORT,
	};
	const unsigned int blkshift = mapping->host->i_blkbits - SECTOR_SHIFT;
	int ret;

	if (filemap_write_and_wait(mapping))
		return 0;

	bno = 0;
	while ((ret = iomap_iter(&iter, ops)) > 0) {
		if (iter.iomap.type == IOMAP_MAPPED)
			bno = iomap_sector(&iter.iomap, iter.pos) >> blkshift;
		/* leave iter.processed unset to abort loop */
	}
	if (ret)
		return 0;

	return bno;
}
EXPORT_SYMBOL_GPL(iomap_bmap);
Commit	Line	Data
5157fb8f DW	1	// SPDX-License-Identifier: GPL-2.0
5157fb8f DW	2	/*
7892386d	3	* Copyright (c) 2016-2021 Christoph Hellwig.
5157fb8f DW	4	*/
	5	#include <linux/module.h>
	6	#include <linux/compiler.h>
	7	#include <linux/fs.h>
	8	#include <linux/iomap.h>
10c5db28	9	#include <linux/fiemap.h>
5157fb8f	10
5157fb8f	11	static int iomap_to_fiemap(struct fiemap_extent_info *fi,
7892386d	12	const struct iomap *iomap, u32 flags)
5157fb8f DW	13	{
	14	switch (iomap->type) {
	15	case IOMAP_HOLE:
	16	/* skip holes */
	17	return 0;
	18	case IOMAP_DELALLOC:
	19	flags \|= FIEMAP_EXTENT_DELALLOC \| FIEMAP_EXTENT_UNKNOWN;
	20	break;
	21	case IOMAP_MAPPED:
	22	break;
	23	case IOMAP_UNWRITTEN:
	24	flags \|= FIEMAP_EXTENT_UNWRITTEN;
	25	break;
	26	case IOMAP_INLINE:
	27	flags \|= FIEMAP_EXTENT_DATA_INLINE;
	28	break;
	29	}
	30
	31	if (iomap->flags & IOMAP_F_MERGED)
	32	flags \|= FIEMAP_EXTENT_MERGED;
	33	if (iomap->flags & IOMAP_F_SHARED)
	34	flags \|= FIEMAP_EXTENT_SHARED;
	35
	36	return fiemap_fill_next_extent(fi, iomap->offset,
	37	iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
	38	iomap->length, flags);
	39	}
	40
7892386d CH	41	static loff_t iomap_fiemap_iter(const struct iomap_iter *iter,
7892386d CH	42	struct fiemap_extent_info fi, struct iomap prev)
5157fb8f	43	{
7892386d	44	int ret;
5157fb8f	45
7892386d CH	46	if (iter->iomap.type == IOMAP_HOLE)
7892386d CH	47	return iomap_length(iter);
5157fb8f	48
7892386d CH	49	ret = iomap_to_fiemap(fi, prev, 0);
7892386d CH	50	*prev = iter->iomap;
5157fb8f DW	51	switch (ret) {
5157fb8f DW	52	case 0: /* success */
7892386d	53	return iomap_length(iter);
5157fb8f DW	54	case 1: /* extent array full */
5157fb8f DW	55	return 0;
7892386d	56	default: /* error */
5157fb8f DW	57	return ret;
	58	}
	59	}
	60
	61	int iomap_fiemap(struct inode inode, struct fiemap_extent_info fi,
27328818	62	u64 start, u64 len, const struct iomap_ops *ops)
5157fb8f	63	{
7892386d CH	64	struct iomap_iter iter = {
	65	.inode = inode,
	66	.pos = start,
	67	.len = len,
	68	.flags = IOMAP_REPORT,
	69	};
	70	struct iomap prev = {
	71	.type = IOMAP_HOLE,
	72	};
	73	int ret;
5157fb8f	74
7892386d	75	ret = fiemap_prep(inode, fi, start, &iter.len, 0);
5157fb8f DW	76	if (ret)
	77	return ret;
	78
7892386d CH	79	while ((ret = iomap_iter(&iter, ops)) > 0)
7892386d CH	80	iter.processed = iomap_fiemap_iter(&iter, fi, &prev);
5157fb8f	81
7892386d CH	82	if (prev.type != IOMAP_HOLE) {
7892386d CH	83	ret = iomap_to_fiemap(fi, &prev, FIEMAP_EXTENT_LAST);
5157fb8f DW	84	if (ret < 0)
	85	return ret;
	86	}
	87
7892386d CH	88	/* inode with no (attribute) mapping will give ENOENT */
	89	if (ret < 0 && ret != -ENOENT)
	90	return ret;
5157fb8f DW	91	return 0;
	92	}
	93	EXPORT_SYMBOL_GPL(iomap_fiemap);
	94
5157fb8f DW	95	/* legacy ->bmap interface. 0 is the error return (!) */
	96	sector_t
	97	iomap_bmap(struct address_space *mapping, sector_t bno,
	98	const struct iomap_ops *ops)
	99	{
6d8a1287 CH	100	struct iomap_iter iter = {
	101	.inode = mapping->host,
	102	.pos = (loff_t)bno << mapping->host->i_blkbits,
	103	.len = i_blocksize(mapping->host),
	104	.flags = IOMAP_REPORT,
	105	};
	106	const unsigned int blkshift = mapping->host->i_blkbits - SECTOR_SHIFT;
2b91b28e	107	int ret;
5157fb8f DW	108
	109	if (filemap_write_and_wait(mapping))
	110	return 0;
	111
	112	bno = 0;
6d8a1287 CH	113	while ((ret = iomap_iter(&iter, ops)) > 0) {
	114	if (iter.iomap.type == IOMAP_MAPPED)
	115	bno = iomap_sector(&iter.iomap, iter.pos) >> blkshift;
	116	/* leave iter.processed unset to abort loop */
	117	}
2b91b28e DW	118	if (ret)
2b91b28e DW	119	return 0;
6d8a1287	120
5157fb8f DW	121	return bno;
	122	}
	123	EXPORT_SYMBOL_GPL(iomap_bmap);