// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Copyright (C) 2013 Fusion IO. All rights reserved.
|
*/
|
|
#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"
|
#include "../btrfs_inode.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 %llu, end %llu, nr_pages %lu, ret %d\n",
|
start, end, nr_pages, ret);
|
break;
|
}
|
}
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return count;
|
}
|
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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;
|
/* In this test we need at least 2 file extents at its maximum size */
|
u64 max_bytes = BTRFS_MAX_EXTENT_SIZE;
|
u64 total_dirty = 2 * max_bytes;
|
u64 start, end, test_start;
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bool found;
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int ret = -EINVAL;
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test_msg("running find delalloc tests");
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|
inode = btrfs_new_test_inode();
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if (!inode) {
|
test_std_err(TEST_ALLOC_INODE);
|
return -ENOMEM;
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}
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tmp = &BTRFS_I(inode)->io_tree;
|
|
/*
|
* Passing NULL as we don't have fs_info but tracepoints are not used
|
* at this point
|
*/
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extent_io_tree_init(NULL, tmp, IO_TREE_SELFTEST, NULL);
|
|
/*
|
* 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.
|
*/
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for (index = 0; index < (total_dirty >> PAGE_SHIFT); index++) {
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page = find_or_create_page(inode->i_mapping, index, GFP_KERNEL);
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if (!page) {
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test_err("failed to allocate test page");
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ret = -ENOMEM;
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goto out;
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}
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SetPageDirty(page);
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if (index) {
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unlock_page(page);
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} else {
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get_page(page);
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locked_page = page;
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}
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}
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/* Test this scenario
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* |--- delalloc ---|
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* |--- search ---|
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*/
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set_extent_delalloc(tmp, 0, sectorsize - 1, 0, NULL);
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start = 0;
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end = 0;
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found = find_lock_delalloc_range(inode, locked_page, &start,
|
&end);
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if (!found) {
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test_err("should have found at least one delalloc");
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goto out_bits;
|
}
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if (start != 0 || end != (sectorsize - 1)) {
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test_err("expected start 0 end %u, got start %llu end %llu",
|
sectorsize - 1, start, end);
|
goto out_bits;
|
}
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unlock_extent(tmp, start, end);
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unlock_page(locked_page);
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put_page(locked_page);
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/*
|
* Test this scenario
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*
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* |--- delalloc ---|
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* |--- search ---|
|
*/
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test_start = SZ_64M;
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locked_page = find_lock_page(inode->i_mapping,
|
test_start >> PAGE_SHIFT);
|
if (!locked_page) {
|
test_err("couldn't find the locked page");
|
goto out_bits;
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}
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set_extent_delalloc(tmp, sectorsize, max_bytes - 1, 0, NULL);
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start = test_start;
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end = 0;
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found = find_lock_delalloc_range(inode, locked_page, &start,
|
&end);
|
if (!found) {
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test_err("couldn't find delalloc in our range");
|
goto out_bits;
|
}
|
if (start != test_start || end != max_bytes - 1) {
|
test_err("expected start %llu end %llu, got start %llu, end %llu",
|
test_start, max_bytes - 1, start, end);
|
goto out_bits;
|
}
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if (process_page_range(inode, start, end,
|
PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
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test_err("there were unlocked pages in the range");
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goto out_bits;
|
}
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unlock_extent(tmp, start, end);
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/* locked_page was unlocked above */
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put_page(locked_page);
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/*
|
* Test this scenario
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* |--- delalloc ---|
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* |--- search ---|
|
*/
|
test_start = max_bytes + sectorsize;
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locked_page = find_lock_page(inode->i_mapping, test_start >>
|
PAGE_SHIFT);
|
if (!locked_page) {
|
test_err("couldn't find the locked page");
|
goto out_bits;
|
}
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start = test_start;
|
end = 0;
|
found = find_lock_delalloc_range(inode, locked_page, &start,
|
&end);
|
if (found) {
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test_err("found range when we shouldn't have");
|
goto out_bits;
|
}
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if (end != (u64)-1) {
|
test_err("did not return the proper end offset");
|
goto out_bits;
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}
|
|
/*
|
* Test this scenario
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* [------- 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, 0, NULL);
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start = test_start;
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end = 0;
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found = find_lock_delalloc_range(inode, locked_page, &start,
|
&end);
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if (!found) {
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test_err("didn't find our range");
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goto out_bits;
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}
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if (start != test_start || end != total_dirty - 1) {
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test_err("expected start %llu end %llu, got start %llu end %llu",
|
test_start, total_dirty - 1, start, end);
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goto out_bits;
|
}
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if (process_page_range(inode, start, end,
|
PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
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test_err("pages in range were not all locked");
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goto out_bits;
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}
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unlock_extent(tmp, start, end);
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/*
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* Now to test where we run into a page that is no longer dirty in the
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* range we want to find.
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*/
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page = find_get_page(inode->i_mapping,
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(max_bytes + SZ_1M) >> PAGE_SHIFT);
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if (!page) {
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test_err("couldn't find our page");
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goto out_bits;
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}
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ClearPageDirty(page);
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put_page(page);
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/* We unlocked it in the previous test */
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lock_page(locked_page);
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start = test_start;
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end = 0;
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/*
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* Currently if we fail to find dirty pages in the delalloc range we
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* will adjust max_bytes down to PAGE_SIZE and then re-search. If
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* this changes at any point in the future we will need to fix this
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* tests expected behavior.
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*/
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found = find_lock_delalloc_range(inode, locked_page, &start,
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&end);
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if (!found) {
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test_err("didn't find our range");
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goto out_bits;
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}
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if (start != test_start && end != test_start + PAGE_SIZE - 1) {
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test_err("expected start %llu end %llu, got start %llu end %llu",
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test_start, test_start + PAGE_SIZE - 1, start, end);
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goto out_bits;
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}
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if (process_page_range(inode, start, end, PROCESS_TEST_LOCKED |
|
PROCESS_UNLOCK)) {
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test_err("pages in range were not all locked");
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goto out_bits;
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}
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ret = 0;
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out_bits:
|
clear_extent_bits(tmp, 0, total_dirty - 1, (unsigned)-1);
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out:
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if (locked_page)
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put_page(locked_page);
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process_page_range(inode, 0, total_dirty - 1,
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PROCESS_UNLOCK | PROCESS_RELEASE);
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iput(inode);
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return ret;
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}
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static int check_eb_bitmap(unsigned long *bitmap, struct extent_buffer *eb,
|
unsigned long len)
|
{
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unsigned long i;
|
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for (i = 0; i < len * BITS_PER_BYTE; i++) {
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int bit, bit1;
|
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bit = !!test_bit(i, bitmap);
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bit1 = !!extent_buffer_test_bit(eb, 0, i);
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if (bit1 != bit) {
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test_err("bits do not match");
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return -EINVAL;
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}
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bit1 = !!extent_buffer_test_bit(eb, i / BITS_PER_BYTE,
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i % BITS_PER_BYTE);
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if (bit1 != bit) {
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test_err("offset bits do not match");
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return -EINVAL;
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}
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}
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return 0;
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}
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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);
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memzero_extent_buffer(eb, 0, len);
|
if (memcmp_extent_buffer(eb, bitmap, 0, len) != 0) {
|
test_err("bitmap was not zeroed");
|
return -EINVAL;
|
}
|
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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_err("setting all bits failed");
|
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_err("clearing all bits failed");
|
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_err("setting straddling pages failed");
|
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_err("clearing straddling pages failed");
|
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_err("random bit pattern failed");
|
return ret;
|
}
|
|
return 0;
|
}
|
|
static int test_eb_bitmaps(u32 sectorsize, u32 nodesize)
|
{
|
struct btrfs_fs_info *fs_info;
|
unsigned long len;
|
unsigned long *bitmap = NULL;
|
struct extent_buffer *eb = NULL;
|
int ret;
|
|
test_msg("running extent buffer bitmap tests");
|
|
/*
|
* 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;
|
|
fs_info = btrfs_alloc_dummy_fs_info(len, len);
|
if (!fs_info) {
|
test_std_err(TEST_ALLOC_FS_INFO);
|
return -ENOMEM;
|
}
|
|
bitmap = kmalloc(len, GFP_KERNEL);
|
if (!bitmap) {
|
test_err("couldn't allocate test bitmap");
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
eb = __alloc_dummy_extent_buffer(fs_info, 0, len);
|
if (!eb) {
|
test_std_err(TEST_ALLOC_ROOT);
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
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(fs_info, nodesize / 2, len);
|
if (!eb) {
|
test_std_err(TEST_ALLOC_ROOT);
|
ret = -ENOMEM;
|
goto out;
|
}
|
|
ret = __test_eb_bitmaps(bitmap, eb, len);
|
out:
|
free_extent_buffer(eb);
|
kfree(bitmap);
|
btrfs_free_dummy_fs_info(fs_info);
|
return ret;
|
}
|
|
static int test_find_first_clear_extent_bit(void)
|
{
|
struct extent_io_tree tree;
|
u64 start, end;
|
int ret = -EINVAL;
|
|
test_msg("running find_first_clear_extent_bit test");
|
|
extent_io_tree_init(NULL, &tree, IO_TREE_SELFTEST, NULL);
|
|
/* Test correct handling of empty tree */
|
find_first_clear_extent_bit(&tree, 0, &start, &end, CHUNK_TRIMMED);
|
if (start != 0 || end != -1) {
|
test_err(
|
"error getting a range from completely empty tree: start %llu end %llu",
|
start, end);
|
goto out;
|
}
|
/*
|
* Set 1M-4M alloc/discard and 32M-64M thus leaving a hole between
|
* 4M-32M
|
*/
|
set_extent_bits(&tree, SZ_1M, SZ_4M - 1,
|
CHUNK_TRIMMED | CHUNK_ALLOCATED);
|
|
find_first_clear_extent_bit(&tree, SZ_512K, &start, &end,
|
CHUNK_TRIMMED | CHUNK_ALLOCATED);
|
|
if (start != 0 || end != SZ_1M - 1) {
|
test_err("error finding beginning range: start %llu end %llu",
|
start, end);
|
goto out;
|
}
|
|
/* Now add 32M-64M so that we have a hole between 4M-32M */
|
set_extent_bits(&tree, SZ_32M, SZ_64M - 1,
|
CHUNK_TRIMMED | CHUNK_ALLOCATED);
|
|
/*
|
* Request first hole starting at 12M, we should get 4M-32M
|
*/
|
find_first_clear_extent_bit(&tree, 12 * SZ_1M, &start, &end,
|
CHUNK_TRIMMED | CHUNK_ALLOCATED);
|
|
if (start != SZ_4M || end != SZ_32M - 1) {
|
test_err("error finding trimmed range: start %llu end %llu",
|
start, end);
|
goto out;
|
}
|
|
/*
|
* Search in the middle of allocated range, should get the next one
|
* available, which happens to be unallocated -> 4M-32M
|
*/
|
find_first_clear_extent_bit(&tree, SZ_2M, &start, &end,
|
CHUNK_TRIMMED | CHUNK_ALLOCATED);
|
|
if (start != SZ_4M || end != SZ_32M - 1) {
|
test_err("error finding next unalloc range: start %llu end %llu",
|
start, end);
|
goto out;
|
}
|
|
/*
|
* Set 64M-72M with CHUNK_ALLOC flag, then search for CHUNK_TRIMMED flag
|
* being unset in this range, we should get the entry in range 64M-72M
|
*/
|
set_extent_bits(&tree, SZ_64M, SZ_64M + SZ_8M - 1, CHUNK_ALLOCATED);
|
find_first_clear_extent_bit(&tree, SZ_64M + SZ_1M, &start, &end,
|
CHUNK_TRIMMED);
|
|
if (start != SZ_64M || end != SZ_64M + SZ_8M - 1) {
|
test_err("error finding exact range: start %llu end %llu",
|
start, end);
|
goto out;
|
}
|
|
find_first_clear_extent_bit(&tree, SZ_64M - SZ_8M, &start, &end,
|
CHUNK_TRIMMED);
|
|
/*
|
* Search in the middle of set range whose immediate neighbour doesn't
|
* have the bits set so it must be returned
|
*/
|
if (start != SZ_64M || end != SZ_64M + SZ_8M - 1) {
|
test_err("error finding next alloc range: start %llu end %llu",
|
start, end);
|
goto out;
|
}
|
|
/*
|
* Search beyond any known range, shall return after last known range
|
* and end should be -1
|
*/
|
find_first_clear_extent_bit(&tree, -1, &start, &end, CHUNK_TRIMMED);
|
if (start != SZ_64M + SZ_8M || end != -1) {
|
test_err(
|
"error handling beyond end of range search: start %llu end %llu",
|
start, end);
|
goto out;
|
}
|
|
ret = 0;
|
out:
|
clear_extent_bits(&tree, 0, (u64)-1, CHUNK_TRIMMED | CHUNK_ALLOCATED);
|
|
return ret;
|
}
|
|
int btrfs_test_extent_io(u32 sectorsize, u32 nodesize)
|
{
|
int ret;
|
|
test_msg("running extent I/O tests");
|
|
ret = test_find_delalloc(sectorsize);
|
if (ret)
|
goto out;
|
|
ret = test_find_first_clear_extent_bit();
|
if (ret)
|
goto out;
|
|
ret = test_eb_bitmaps(sectorsize, nodesize);
|
out:
|
return ret;
|
}
|
