linux/fs/btrfs/tests/extent-io-tests.c
Josef Bacik 294e30fee3 Btrfs: add tests for find_lock_delalloc_range
So both Liu and I made huge messes of find_lock_delalloc_range trying to fix
stuff, me first by fixing extent size, then him by fixing something I broke and
then me again telling him to fix it a different way.  So this is obviously a
candidate for some testing.  This patch adds a pseudo fs so we can allocate fake
inodes for tests that need an inode or pages.  Then it addes a bunch of tests to
make sure find_lock_delalloc_range is acting the way it is supposed to.  With
this patch and all of our previous patches to find_lock_delalloc_range I am sure
it is working as expected now.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-11-11 21:56:51 -05:00

277 lines
7.4 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 "btrfs-tests.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_CACHE_SHIFT;
unsigned long end_index = end >> PAGE_CACHE_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]);
page_cache_release(pages[i]);
if (flags & PROCESS_RELEASE)
page_cache_release(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(void)
{
struct inode *inode;
struct extent_io_tree tmp;
struct page *page;
struct page *locked_page = NULL;
unsigned long index = 0;
u64 total_dirty = 256 * 1024 * 1024;
u64 max_bytes = 128 * 1024 * 1024;
u64 start, end, test_start;
u64 found;
int ret = -EINVAL;
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_CACHE_SHIFT); index++) {
page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
if (!page) {
test_msg("Failed to allocate test page\n");
ret = -ENOMEM;
goto out;
}
SetPageDirty(page);
if (index) {
unlock_page(page);
} else {
page_cache_get(page);
locked_page = page;
}
}
/* Test this scenario
* |--- delalloc ---|
* |--- search ---|
*/
set_extent_delalloc(&tmp, 0, 4095, NULL, GFP_NOFS);
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 != 4095) {
test_msg("Expected start 0 end 4095, got start %Lu end %Lu\n",
start, end);
goto out_bits;
}
unlock_extent(&tmp, start, end);
unlock_page(locked_page);
page_cache_release(locked_page);
/*
* Test this scenario
*
* |--- delalloc ---|
* |--- search ---|
*/
test_start = 64 * 1024 * 1024;
locked_page = find_lock_page(inode->i_mapping,
test_start >> PAGE_CACHE_SHIFT);
if (!locked_page) {
test_msg("Couldn't find the locked page\n");
goto out_bits;
}
set_extent_delalloc(&tmp, 4096, max_bytes - 1, NULL, GFP_NOFS);
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 */
page_cache_release(locked_page);
/*
* Test this scenario
* |--- delalloc ---|
* |--- search ---|
*/
test_start = max_bytes + 4096;
locked_page = find_lock_page(inode->i_mapping, test_start >>
PAGE_CACHE_SHIFT);
if (!locked_page) {
test_msg("Could'nt 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, GFP_NOFS);
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 + (1 * 1024 * 1024))
>> PAGE_CACHE_SHIFT);
if (!page) {
test_msg("Couldn't find our page\n");
goto out_bits;
}
ClearPageDirty(page);
page_cache_release(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_CACHE_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_CACHE_SIZE - 1) {
test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
test_start, test_start + PAGE_CACHE_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 long)-1, GFP_NOFS);
out:
if (locked_page)
page_cache_release(locked_page);
process_page_range(inode, 0, total_dirty - 1,
PROCESS_UNLOCK | PROCESS_RELEASE);
iput(inode);
return ret;
}
int btrfs_test_extent_io(void)
{
test_msg("Running find delalloc tests\n");
return test_find_delalloc();
}