[deliverable/linux.git] / fs / btrfs / tests / extent-io-tests.c

/*
 * Copyright (C) 2013 Fusion IO.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License v2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this program; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 021110-1307, USA.
 */

#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sizes.h>
#include "btrfs-tests.h"
#include "../ctree.h"
#include "../extent_io.h"

#define PROCESS_UNLOCK		(1 << 0)
#define PROCESS_RELEASE		(1 << 1)
#define PROCESS_TEST_LOCKED	(1 << 2)

static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
				       unsigned long flags)
{
	int ret;
	struct page *pages[16];
	unsigned long index = start >> PAGE_SHIFT;
	unsigned long end_index = end >> PAGE_SHIFT;
	unsigned long nr_pages = end_index - index + 1;
	int i;
	int count = 0;
	int loops = 0;

	while (nr_pages > 0) {
		ret = find_get_pages_contig(inode->i_mapping, index,
				     min_t(unsigned long, nr_pages,
				     ARRAY_SIZE(pages)), pages);
		for (i = 0; i < ret; i++) {
			if (flags & PROCESS_TEST_LOCKED &&
			    !PageLocked(pages[i]))
				count++;
			if (flags & PROCESS_UNLOCK && PageLocked(pages[i]))
				unlock_page(pages[i]);
			put_page(pages[i]);
			if (flags & PROCESS_RELEASE)
				put_page(pages[i]);
		}
		nr_pages -= ret;
		index += ret;
		cond_resched();
		loops++;
		if (loops > 100000) {
			printk(KERN_ERR "stuck in a loop, start %Lu, end %Lu, nr_pages %lu, ret %d\n", start, end, nr_pages, ret);
			break;
		}
	}
	return count;
}

static int test_find_delalloc(u32 sectorsize)
{
	struct inode *inode;
	struct extent_io_tree tmp;
	struct page *page;
	struct page *locked_page = NULL;
	unsigned long index = 0;
	u64 total_dirty = SZ_256M;
	u64 max_bytes = SZ_128M;
	u64 start, end, test_start;
	u64 found;
	int ret = -EINVAL;

	test_msg("Running find delalloc tests\n");

	inode = btrfs_new_test_inode();
	if (!inode) {
		test_msg("Failed to allocate test inode\n");
		return -ENOMEM;
	}

	extent_io_tree_init(&tmp, &inode->i_data);

	/*
	 * First go through and create and mark all of our pages dirty, we pin
	 * everything to make sure our pages don't get evicted and screw up our
	 * test.
	 */
	for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
		page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
		if (!page) {
			test_msg("Failed to allocate test page\n");
			ret = -ENOMEM;
			goto out;
		}
		SetPageDirty(page);
		if (index) {
			unlock_page(page);
		} else {
			get_page(page);
			locked_page = page;
		}
	}

	/* Test this scenario
	 * |--- delalloc ---|
	 * |---  search  ---|
	 */
	set_extent_delalloc(&tmp, 0, sectorsize - 1, NULL);
	start = 0;
	end = 0;
	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
					 &end, max_bytes);
	if (!found) {
		test_msg("Should have found at least one delalloc\n");
		goto out_bits;
	}
	if (start != 0 || end != (sectorsize - 1)) {
		test_msg("Expected start 0 end %u, got start %llu end %llu\n",
			sectorsize - 1, start, end);
		goto out_bits;
	}
	unlock_extent(&tmp, start, end);
	unlock_page(locked_page);
	put_page(locked_page);

	/*
	 * Test this scenario
	 *
	 * |--- delalloc ---|
	 *           |--- search ---|
	 */
	test_start = SZ_64M;
	locked_page = find_lock_page(inode->i_mapping,
				     test_start >> PAGE_SHIFT);
	if (!locked_page) {
		test_msg("Couldn't find the locked page\n");
		goto out_bits;
	}
	set_extent_delalloc(&tmp, sectorsize, max_bytes - 1, NULL);
	start = test_start;
	end = 0;
	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
					 &end, max_bytes);
	if (!found) {
		test_msg("Couldn't find delalloc in our range\n");
		goto out_bits;
	}
	if (start != test_start || end != max_bytes - 1) {
		test_msg("Expected start %Lu end %Lu, got start %Lu, end "
			 "%Lu\n", test_start, max_bytes - 1, start, end);
		goto out_bits;
	}
	if (process_page_range(inode, start, end,
			       PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
		test_msg("There were unlocked pages in the range\n");
		goto out_bits;
	}
	unlock_extent(&tmp, start, end);
	/* locked_page was unlocked above */
	put_page(locked_page);

	/*
	 * Test this scenario
	 * |--- delalloc ---|
	 *                    |--- search ---|
	 */
	test_start = max_bytes + sectorsize;
	locked_page = find_lock_page(inode->i_mapping, test_start >>
				     PAGE_SHIFT);
	if (!locked_page) {
		test_msg("Couldn't find the locked page\n");
		goto out_bits;
	}
	start = test_start;
	end = 0;
	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
					 &end, max_bytes);
	if (found) {
		test_msg("Found range when we shouldn't have\n");
		goto out_bits;
	}
	if (end != (u64)-1) {
		test_msg("Did not return the proper end offset\n");
		goto out_bits;
	}

	/*
	 * Test this scenario
	 * [------- delalloc -------|
	 * [max_bytes]|-- search--|
	 *
	 * We are re-using our test_start from above since it works out well.
	 */
	set_extent_delalloc(&tmp, max_bytes, total_dirty - 1, NULL);
	start = test_start;
	end = 0;
	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
					 &end, max_bytes);
	if (!found) {
		test_msg("Didn't find our range\n");
		goto out_bits;
	}
	if (start != test_start || end != total_dirty - 1) {
		test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
			 test_start, total_dirty - 1, start, end);
		goto out_bits;
	}
	if (process_page_range(inode, start, end,
			       PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
		test_msg("Pages in range were not all locked\n");
		goto out_bits;
	}
	unlock_extent(&tmp, start, end);

	/*
	 * Now to test where we run into a page that is no longer dirty in the
	 * range we want to find.
	 */
	page = find_get_page(inode->i_mapping,
			     (max_bytes + SZ_1M) >> PAGE_SHIFT);
	if (!page) {
		test_msg("Couldn't find our page\n");
		goto out_bits;
	}
	ClearPageDirty(page);
	put_page(page);

	/* We unlocked it in the previous test */
	lock_page(locked_page);
	start = test_start;
	end = 0;
	/*
	 * Currently if we fail to find dirty pages in the delalloc range we
	 * will adjust max_bytes down to PAGE_SIZE and then re-search.  If
	 * this changes at any point in the future we will need to fix this
	 * tests expected behavior.
	 */
	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
					 &end, max_bytes);
	if (!found) {
		test_msg("Didn't find our range\n");
		goto out_bits;
	}
	if (start != test_start && end != test_start + PAGE_SIZE - 1) {
		test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
			 test_start, test_start + PAGE_SIZE - 1, start,
			 end);
		goto out_bits;
	}
	if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED |
			       PROCESS_UNLOCK)) {
		test_msg("Pages in range were not all locked\n");
		goto out_bits;
	}
	ret = 0;
out_bits:
	clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1);
out:
	if (locked_page)
		put_page(locked_page);
	process_page_range(inode, 0, total_dirty - 1,
			   PROCESS_UNLOCK | PROCESS_RELEASE);
	iput(inode);
	return ret;
}

/**
 * test_bit_in_byte - Determine whether a bit is set in a byte
 * @nr: bit number to test
 * @addr: Address to start counting from
 */
static inline int test_bit_in_byte(int nr, const u8 *addr)
{
	return 1UL & (addr[nr / BITS_PER_BYTE] >> (nr & (BITS_PER_BYTE - 1)));
}

static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
			     unsigned long len)
{
	unsigned long i, x;

	memset(bitmap, 0, len);
	memset_extent_buffer(eb, 0, 0, len);
	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
		test_msg("Bitmap was not zeroed\n");
		return -EINVAL;
	}

	bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
	extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
		test_msg("Setting all bits failed\n");
		return -EINVAL;
	}

	bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
	extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
		test_msg("Clearing all bits failed\n");
		return -EINVAL;
	}

	/* Straddling pages test */
	if (len > PAGE_SIZE) {
		bitmap_set(bitmap,
			(PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
			sizeof(long) * BITS_PER_BYTE);
		extent_buffer_bitmap_set(eb, PAGE_SIZE - sizeof(long) / 2, 0,
					sizeof(long) * BITS_PER_BYTE);
		if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
			test_msg("Setting straddling pages failed\n");
			return -EINVAL;
		}

		bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
		bitmap_clear(bitmap,
			(PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
			sizeof(long) * BITS_PER_BYTE);
		extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
		extent_buffer_bitmap_clear(eb, PAGE_SIZE - sizeof(long) / 2, 0,
					sizeof(long) * BITS_PER_BYTE);
		if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
			test_msg("Clearing straddling pages failed\n");
			return -EINVAL;
		}
	}

	/*
	 * Generate a wonky pseudo-random bit pattern for the sake of not using
	 * something repetitive that could miss some hypothetical off-by-n bug.
	 */
	x = 0;
	for (i = 0; i < len / sizeof(long); i++) {
		x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffUL;
		bitmap[i] = x;
	}
	write_extent_buffer(eb, bitmap, 0, len);

	for (i = 0; i < len * BITS_PER_BYTE; i++) {
		int bit, bit1;

		bit = !!test_bit_in_byte(i, (u8 *)bitmap);
		bit1 = !!extent_buffer_test_bit(eb, 0, i);
		if (bit1 != bit) {
			test_msg("Testing bit pattern failed\n");
			return -EINVAL;
		}

		bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
						i % BITS_PER_BYTE);
		if (bit1 != bit) {
			test_msg("Testing bit pattern with offset failed\n");
			return -EINVAL;
		}
	}

	return 0;
}

static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
{
	unsigned long len;
	unsigned long *bitmap;
	struct extent_buffer *eb;
	int ret;

	test_msg("Running extent buffer bitmap tests\n");

	/*
	 * In ppc64, sectorsize can be 64K, thus 4 * 64K will be larger than
	 * BTRFS_MAX_METADATA_BLOCKSIZE.
	 */
	len = (sectorsize < BTRFS_MAX_METADATA_BLOCKSIZE)
		? sectorsize * 4 : sectorsize;

	bitmap = kmalloc(len, GFP_KERNEL);
	if (!bitmap) {
		test_msg("Couldn't allocate test bitmap\n");
		return -ENOMEM;
	}

	eb = __alloc_dummy_extent_buffer(NULL, 0, len);
	if (!eb) {
		test_msg("Couldn't allocate test extent buffer\n");
		kfree(bitmap);
		return -ENOMEM;
	}

	ret = __test_eb_bitmaps(bitmap, eb, len);
	if (ret)
		goto out;

	/* Do it over again with an extent buffer which isn't page-aligned. */
	free_extent_buffer(eb);
	eb = __alloc_dummy_extent_buffer(NULL, nodesize / 2, len);
	if (!eb) {
		test_msg("Couldn't allocate test extent buffer\n");
		kfree(bitmap);
		return -ENOMEM;
	}

	ret = __test_eb_bitmaps(bitmap, eb, len);
out:
	free_extent_buffer(eb);
	kfree(bitmap);
	return ret;
}

int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
{
	int ret;

	test_msg("Running extent I/O tests\n");

	ret = test_find_delalloc(sectorsize);
	if (ret)
		goto out;

	ret = test_eb_bitmaps(sectorsize, nodesize);
out:
	test_msg("Extent I/O tests finished\n");
	return ret;
}
Commit	Line	Data
294e30fe JB	1	/*
	2	* Copyright (C) 2013 Fusion IO. All rights reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public
	6	* License v2 as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public
	14	* License along with this program; if not, write to the
	15	* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	16	* Boston, MA 021110-1307, USA.
	17	*/
	18
	19	#include <linux/pagemap.h>
	20	#include <linux/sched.h>
0f331229	21	#include <linux/slab.h>
ee22184b	22	#include <linux/sizes.h>
294e30fe	23	#include "btrfs-tests.h"
ed9e4afd	24	#include "../ctree.h"
294e30fe JB	25	#include "../extent_io.h"
	26
	27	#define PROCESS_UNLOCK (1 << 0)
	28	#define PROCESS_RELEASE (1 << 1)
	29	#define PROCESS_TEST_LOCKED (1 << 2)
	30
	31	static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
	32	unsigned long flags)
	33	{
	34	int ret;
	35	struct page *pages[16];
09cbfeaf KS	36	unsigned long index = start >> PAGE_SHIFT;
09cbfeaf KS	37	unsigned long end_index = end >> PAGE_SHIFT;
294e30fe JB	38	unsigned long nr_pages = end_index - index + 1;
	39	int i;
	40	int count = 0;
	41	int loops = 0;
	42
	43	while (nr_pages > 0) {
	44	ret = find_get_pages_contig(inode->i_mapping, index,
	45	min_t(unsigned long, nr_pages,
	46	ARRAY_SIZE(pages)), pages);
	47	for (i = 0; i < ret; i++) {
	48	if (flags & PROCESS_TEST_LOCKED &&
	49	!PageLocked(pages[i]))
	50	count++;
	51	if (flags & PROCESS_UNLOCK && PageLocked(pages[i]))
	52	unlock_page(pages[i]);
09cbfeaf	53	put_page(pages[i]);
294e30fe	54	if (flags & PROCESS_RELEASE)
09cbfeaf	55	put_page(pages[i]);
294e30fe JB	56	}
	57	nr_pages -= ret;
	58	index += ret;
	59	cond_resched();
	60	loops++;
	61	if (loops > 100000) {
	62	printk(KERN_ERR "stuck in a loop, start %Lu, end %Lu, nr_pages %lu, ret %d\n", start, end, nr_pages, ret);
	63	break;
	64	}
	65	}
	66	return count;
	67	}
	68
b9ef22de	69	static int test_find_delalloc(u32 sectorsize)
294e30fe JB	70	{
	71	struct inode *inode;
	72	struct extent_io_tree tmp;
	73	struct page *page;
	74	struct page *locked_page = NULL;
	75	unsigned long index = 0;
ee22184b BL	76	u64 total_dirty = SZ_256M;
ee22184b BL	77	u64 max_bytes = SZ_128M;
294e30fe JB	78	u64 start, end, test_start;
	79	u64 found;
	80	int ret = -EINVAL;
	81
0f331229 OS	82	test_msg("Running find delalloc tests\n");
0f331229 OS	83
294e30fe JB	84	inode = btrfs_new_test_inode();
	85	if (!inode) {
	86	test_msg("Failed to allocate test inode\n");
	87	return -ENOMEM;
	88	}
	89
	90	extent_io_tree_init(&tmp, &inode->i_data);
	91
	92	/*
	93	* First go through and create and mark all of our pages dirty, we pin
	94	* everything to make sure our pages don't get evicted and screw up our
	95	* test.
	96	*/
09cbfeaf	97	for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
8cce83ba	98	page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
294e30fe JB	99	if (!page) {
	100	test_msg("Failed to allocate test page\n");
	101	ret = -ENOMEM;
	102	goto out;
	103	}
	104	SetPageDirty(page);
	105	if (index) {
	106	unlock_page(page);
	107	} else {
09cbfeaf	108	get_page(page);
294e30fe JB	109	locked_page = page;
	110	}
	111	}
	112
	113	/* Test this scenario
	114	* \|--- delalloc ---\|
	115	* \|--- search ---\|
	116	*/
b9ef22de	117	set_extent_delalloc(&tmp, 0, sectorsize - 1, NULL);
294e30fe JB	118	start = 0;
	119	end = 0;
	120	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
	121	&end, max_bytes);
	122	if (!found) {
	123	test_msg("Should have found at least one delalloc\n");
	124	goto out_bits;
	125	}
b9ef22de FX	126	if (start != 0 \|\| end != (sectorsize - 1)) {
	127	test_msg("Expected start 0 end %u, got start %llu end %llu\n",
	128	sectorsize - 1, start, end);
294e30fe JB	129	goto out_bits;
	130	}
	131	unlock_extent(&tmp, start, end);
	132	unlock_page(locked_page);
09cbfeaf	133	put_page(locked_page);
294e30fe JB	134
	135	/*
	136	* Test this scenario
	137	*
	138	* \|--- delalloc ---\|
	139	* \|--- search ---\|
	140	*/
ee22184b	141	test_start = SZ_64M;
294e30fe	142	locked_page = find_lock_page(inode->i_mapping,
09cbfeaf	143	test_start >> PAGE_SHIFT);
294e30fe JB	144	if (!locked_page) {
	145	test_msg("Couldn't find the locked page\n");
	146	goto out_bits;
	147	}
b9ef22de	148	set_extent_delalloc(&tmp, sectorsize, max_bytes - 1, NULL);
294e30fe JB	149	start = test_start;
	150	end = 0;
	151	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
	152	&end, max_bytes);
	153	if (!found) {
	154	test_msg("Couldn't find delalloc in our range\n");
	155	goto out_bits;
	156	}
	157	if (start != test_start \|\| end != max_bytes - 1) {
	158	test_msg("Expected start %Lu end %Lu, got start %Lu, end "
	159	"%Lu\n", test_start, max_bytes - 1, start, end);
	160	goto out_bits;
	161	}
	162	if (process_page_range(inode, start, end,
	163	PROCESS_TEST_LOCKED \| PROCESS_UNLOCK)) {
	164	test_msg("There were unlocked pages in the range\n");
	165	goto out_bits;
	166	}
	167	unlock_extent(&tmp, start, end);
	168	/* locked_page was unlocked above */
09cbfeaf	169	put_page(locked_page);
294e30fe JB	170
	171	/*
	172	* Test this scenario
	173	* \|--- delalloc ---\|
	174	* \|--- search ---\|
	175	*/
b9ef22de	176	test_start = max_bytes + sectorsize;
294e30fe	177	locked_page = find_lock_page(inode->i_mapping, test_start >>
09cbfeaf	178	PAGE_SHIFT);
294e30fe	179	if (!locked_page) {
01327610	180	test_msg("Couldn't find the locked page\n");
294e30fe JB	181	goto out_bits;
	182	}
	183	start = test_start;
	184	end = 0;
	185	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
	186	&end, max_bytes);
	187	if (found) {
	188	test_msg("Found range when we shouldn't have\n");
	189	goto out_bits;
	190	}
	191	if (end != (u64)-1) {
	192	test_msg("Did not return the proper end offset\n");
	193	goto out_bits;
	194	}
	195
	196	/*
	197	* Test this scenario
	198	* [------- delalloc -------\|
	199	* [max_bytes]\|-- search--\|
	200	*
	201	* We are re-using our test_start from above since it works out well.
	202	*/
7cd8c752	203	set_extent_delalloc(&tmp, max_bytes, total_dirty - 1, NULL);
294e30fe JB	204	start = test_start;
	205	end = 0;
	206	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
	207	&end, max_bytes);
	208	if (!found) {
	209	test_msg("Didn't find our range\n");
	210	goto out_bits;
	211	}
	212	if (start != test_start \|\| end != total_dirty - 1) {
	213	test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
	214	test_start, total_dirty - 1, start, end);
	215	goto out_bits;
	216	}
	217	if (process_page_range(inode, start, end,
	218	PROCESS_TEST_LOCKED \| PROCESS_UNLOCK)) {
	219	test_msg("Pages in range were not all locked\n");
	220	goto out_bits;
	221	}
	222	unlock_extent(&tmp, start, end);
	223
	224	/*
	225	* Now to test where we run into a page that is no longer dirty in the
	226	* range we want to find.
	227	*/
ee22184b	228	page = find_get_page(inode->i_mapping,
09cbfeaf	229	(max_bytes + SZ_1M) >> PAGE_SHIFT);
294e30fe JB	230	if (!page) {
	231	test_msg("Couldn't find our page\n");
	232	goto out_bits;
	233	}
	234	ClearPageDirty(page);
09cbfeaf	235	put_page(page);
294e30fe JB	236
	237	/* We unlocked it in the previous test */
	238	lock_page(locked_page);
	239	start = test_start;
	240	end = 0;
	241	/*
	242	* Currently if we fail to find dirty pages in the delalloc range we
ea1754a0	243	* will adjust max_bytes down to PAGE_SIZE and then re-search. If
294e30fe JB	244	* this changes at any point in the future we will need to fix this
	245	* tests expected behavior.
	246	*/
	247	found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
	248	&end, max_bytes);
	249	if (!found) {
	250	test_msg("Didn't find our range\n");
	251	goto out_bits;
	252	}
09cbfeaf	253	if (start != test_start && end != test_start + PAGE_SIZE - 1) {
294e30fe	254	test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
09cbfeaf	255	test_start, test_start + PAGE_SIZE - 1, start,
294e30fe JB	256	end);
	257	goto out_bits;
	258	}
	259	if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED \|
	260	PROCESS_UNLOCK)) {
	261	test_msg("Pages in range were not all locked\n");
	262	goto out_bits;
	263	}
	264	ret = 0;
	265	out_bits:
91166212	266	clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1);
294e30fe JB	267	out:
294e30fe JB	268	if (locked_page)
09cbfeaf	269	put_page(locked_page);
294e30fe JB	270	process_page_range(inode, 0, total_dirty - 1,
	271	PROCESS_UNLOCK \| PROCESS_RELEASE);
	272	iput(inode);
	273	return ret;
	274	}
	275
34b3e6c9 FX	276	/**
	277	* test_bit_in_byte - Determine whether a bit is set in a byte
	278	* @nr: bit number to test
	279	* @addr: Address to start counting from
	280	*/
	281	static inline int test_bit_in_byte(int nr, const u8 *addr)
	282	{
	283	return 1UL & (addr[nr / BITS_PER_BYTE] >> (nr & (BITS_PER_BYTE - 1)));
	284	}
	285
0f331229 OS	286	static int __test_eb_bitmaps(unsigned long bitmap, struct extent_buffer eb,
	287	unsigned long len)
	288	{
	289	unsigned long i, x;
	290
	291	memset(bitmap, 0, len);
	292	memset_extent_buffer(eb, 0, 0, len);
	293	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
	294	test_msg("Bitmap was not zeroed\n");
	295	return -EINVAL;
	296	}
	297
	298	bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
	299	extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
	300	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
	301	test_msg("Setting all bits failed\n");
	302	return -EINVAL;
	303	}
	304
	305	bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
	306	extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
	307	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
	308	test_msg("Clearing all bits failed\n");
	309	return -EINVAL;
	310	}
	311
ed9e4afd FX	312	/* Straddling pages test */
	313	if (len > PAGE_SIZE) {
	314	bitmap_set(bitmap,
	315	(PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
	316	sizeof(long) * BITS_PER_BYTE);
	317	extent_buffer_bitmap_set(eb, PAGE_SIZE - sizeof(long) / 2, 0,
	318	sizeof(long) * BITS_PER_BYTE);
	319	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
	320	test_msg("Setting straddling pages failed\n");
	321	return -EINVAL;
	322	}
0f331229	323
ed9e4afd FX	324	bitmap_set(bitmap, 0, len * BITS_PER_BYTE);
	325	bitmap_clear(bitmap,
	326	(PAGE_SIZE - sizeof(long) / 2) * BITS_PER_BYTE,
	327	sizeof(long) * BITS_PER_BYTE);
	328	extent_buffer_bitmap_set(eb, 0, 0, len * BITS_PER_BYTE);
	329	extent_buffer_bitmap_clear(eb, PAGE_SIZE - sizeof(long) / 2, 0,
	330	sizeof(long) * BITS_PER_BYTE);
	331	if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
	332	test_msg("Clearing straddling pages failed\n");
	333	return -EINVAL;
	334	}
0f331229 OS	335	}
	336
	337	/*
	338	* Generate a wonky pseudo-random bit pattern for the sake of not using
	339	* something repetitive that could miss some hypothetical off-by-n bug.
	340	*/
	341	x = 0;
	342	for (i = 0; i < len / sizeof(long); i++) {
	343	x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffUL;
	344	bitmap[i] = x;
	345	}
	346	write_extent_buffer(eb, bitmap, 0, len);
	347
	348	for (i = 0; i < len * BITS_PER_BYTE; i++) {
	349	int bit, bit1;
	350
34b3e6c9	351	bit = !!test_bit_in_byte(i, (u8 *)bitmap);
0f331229 OS	352	bit1 = !!extent_buffer_test_bit(eb, 0, i);
	353	if (bit1 != bit) {
	354	test_msg("Testing bit pattern failed\n");
	355	return -EINVAL;
	356	}
	357
	358	bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
	359	i % BITS_PER_BYTE);
	360	if (bit1 != bit) {
	361	test_msg("Testing bit pattern with offset failed\n");
	362	return -EINVAL;
	363	}
	364	}
	365
	366	return 0;
	367	}
	368
b9ef22de	369	static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
0f331229	370	{
b9ef22de	371	unsigned long len;
0f331229 OS	372	unsigned long *bitmap;
	373	struct extent_buffer *eb;
	374	int ret;
	375
	376	test_msg("Running extent buffer bitmap tests\n");
ed9e4afd FX	377
	378	/*
	379	* In ppc64, sectorsize can be 64K, thus 4 * 64K will be larger than
	380	* BTRFS_MAX_METADATA_BLOCKSIZE.
	381	*/
	382	len = (sectorsize < BTRFS_MAX_METADATA_BLOCKSIZE)
	383	? sectorsize * 4 : sectorsize;
0f331229	384
8cce83ba	385	bitmap = kmalloc(len, GFP_KERNEL);
0f331229 OS	386	if (!bitmap) {
	387	test_msg("Couldn't allocate test bitmap\n");
	388	return -ENOMEM;
	389	}
	390
	391	eb = __alloc_dummy_extent_buffer(NULL, 0, len);
	392	if (!eb) {
	393	test_msg("Couldn't allocate test extent buffer\n");
	394	kfree(bitmap);
	395	return -ENOMEM;
	396	}
	397
	398	ret = __test_eb_bitmaps(bitmap, eb, len);
	399	if (ret)
	400	goto out;
	401
	402	/* Do it over again with an extent buffer which isn't page-aligned. */
	403	free_extent_buffer(eb);
b9ef22de	404	eb = __alloc_dummy_extent_buffer(NULL, nodesize / 2, len);
0f331229 OS	405	if (!eb) {
	406	test_msg("Couldn't allocate test extent buffer\n");
	407	kfree(bitmap);
	408	return -ENOMEM;
	409	}
	410
	411	ret = __test_eb_bitmaps(bitmap, eb, len);
	412	out:
	413	free_extent_buffer(eb);
	414	kfree(bitmap);
	415	return ret;
	416	}
	417
b9ef22de	418	int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
294e30fe	419	{
0f331229 OS	420	int ret;
	421
	422	test_msg("Running extent I/O tests\n");
	423
b9ef22de	424	ret = test_find_delalloc(sectorsize);
0f331229 OS	425	if (ret)
	426	goto out;
	427
b9ef22de	428	ret = test_eb_bitmaps(sectorsize, nodesize);
0f331229 OS	429	out:
	430	test_msg("Extent I/O tests finished\n");
	431	return ret;
294e30fe	432	}