448 lines
11 KiB
C
448 lines
11 KiB
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;
|
|
}
|
|
|
|
static int check_eb_bitmap(unsigned long *bitmap, struct extent_buffer *eb,
|
|
unsigned long len)
|
|
{
|
|
unsigned long i;
|
|
|
|
for (i = 0; i < len * BITS_PER_BYTE; i++) {
|
|
int bit, bit1;
|
|
|
|
bit = !!test_bit(i, bitmap);
|
|
bit1 = !!extent_buffer_test_bit(eb, 0, i);
|
|
if (bit1 != bit) {
|
|
test_msg("Bits do not match\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
|
|
i % BITS_PER_BYTE);
|
|
if (bit1 != bit) {
|
|
test_msg("Offset bits do not match\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __test_eb_bitmaps(unsigned long *bitmap, struct extent_buffer *eb,
|
|
unsigned long len)
|
|
{
|
|
unsigned long i, j;
|
|
u32 x;
|
|
int ret;
|
|
|
|
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);
|
|
ret = check_eb_bitmap(bitmap, eb, len);
|
|
if (ret) {
|
|
test_msg("Setting all bits failed\n");
|
|
return ret;
|
|
}
|
|
|
|
bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
|
|
extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
|
|
ret = check_eb_bitmap(bitmap, eb, len);
|
|
if (ret) {
|
|
test_msg("Clearing all bits failed\n");
|
|
return ret;
|
|
}
|
|
|
|
/* 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);
|
|
ret = check_eb_bitmap(bitmap, eb, len);
|
|
if (ret) {
|
|
test_msg("Setting straddling pages failed\n");
|
|
return ret;
|
|
}
|
|
|
|
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);
|
|
ret = check_eb_bitmap(bitmap, eb, len);
|
|
if (ret) {
|
|
test_msg("Clearing straddling pages failed\n");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
bitmap_clear(bitmap, 0, len * BITS_PER_BYTE);
|
|
extent_buffer_bitmap_clear(eb, 0, 0, len * BITS_PER_BYTE);
|
|
for (i = 0; i < len * BITS_PER_BYTE / 32; i++) {
|
|
x = (0x19660dULL * (u64)x + 0x3c6ef35fULL) & 0xffffffffU;
|
|
for (j = 0; j < 32; j++) {
|
|
if (x & (1U << j)) {
|
|
bitmap_set(bitmap, i * 32 + j, 1);
|
|
extent_buffer_bitmap_set(eb, 0, i * 32 + j, 1);
|
|
}
|
|
}
|
|
}
|
|
|
|
ret = check_eb_bitmap(bitmap, eb, len);
|
|
if (ret) {
|
|
test_msg("Random bit pattern failed\n");
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
}
|