276 lines
7.4 KiB
C
276 lines
7.4 KiB
C
/*
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* Copyright (C) 2013 Fusion IO. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <linux/pagemap.h>
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#include <linux/sched.h>
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#include "btrfs-tests.h"
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#include "../extent_io.h"
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#define PROCESS_UNLOCK (1 << 0)
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#define PROCESS_RELEASE (1 << 1)
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#define PROCESS_TEST_LOCKED (1 << 2)
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static noinline int process_page_range(struct inode *inode, u64 start, u64 end,
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unsigned long flags)
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{
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int ret;
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struct page *pages[16];
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unsigned long index = start >> PAGE_CACHE_SHIFT;
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unsigned long end_index = end >> PAGE_CACHE_SHIFT;
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unsigned long nr_pages = end_index - index + 1;
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int i;
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int count = 0;
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int loops = 0;
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while (nr_pages > 0) {
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ret = find_get_pages_contig(inode->i_mapping, index,
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min_t(unsigned long, nr_pages,
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ARRAY_SIZE(pages)), pages);
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for (i = 0; i < ret; i++) {
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if (flags & PROCESS_TEST_LOCKED &&
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!PageLocked(pages[i]))
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count++;
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if (flags & PROCESS_UNLOCK && PageLocked(pages[i]))
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unlock_page(pages[i]);
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page_cache_release(pages[i]);
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if (flags & PROCESS_RELEASE)
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page_cache_release(pages[i]);
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}
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nr_pages -= ret;
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index += ret;
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cond_resched();
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loops++;
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if (loops > 100000) {
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printk(KERN_ERR "stuck in a loop, start %Lu, end %Lu, nr_pages %lu, ret %d\n", start, end, nr_pages, ret);
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break;
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}
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}
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return count;
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}
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static int test_find_delalloc(void)
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{
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struct inode *inode;
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struct extent_io_tree tmp;
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struct page *page;
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struct page *locked_page = NULL;
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unsigned long index = 0;
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u64 total_dirty = 256 * 1024 * 1024;
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u64 max_bytes = 128 * 1024 * 1024;
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u64 start, end, test_start;
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u64 found;
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int ret = -EINVAL;
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inode = btrfs_new_test_inode();
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if (!inode) {
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test_msg("Failed to allocate test inode\n");
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return -ENOMEM;
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}
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extent_io_tree_init(&tmp, &inode->i_data);
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/*
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* First go through and create and mark all of our pages dirty, we pin
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* everything to make sure our pages don't get evicted and screw up our
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* test.
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*/
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for (index = 0; index < (total_dirty >> PAGE_CACHE_SHIFT); index++) {
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page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
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if (!page) {
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test_msg("Failed to allocate test page\n");
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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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page_cache_get(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, 4095, NULL, GFP_NOFS);
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start = 0;
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end = 0;
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found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
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&end, max_bytes);
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if (!found) {
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test_msg("Should have found at least one delalloc\n");
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goto out_bits;
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}
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if (start != 0 || end != 4095) {
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test_msg("Expected start 0 end 4095, got start %Lu end %Lu\n",
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start, end);
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goto out_bits;
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}
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unlock_extent(&tmp, start, end);
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unlock_page(locked_page);
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page_cache_release(locked_page);
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/*
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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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*/
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test_start = 64 * 1024 * 1024;
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locked_page = find_lock_page(inode->i_mapping,
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test_start >> PAGE_CACHE_SHIFT);
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if (!locked_page) {
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test_msg("Couldn't find the locked page\n");
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goto out_bits;
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}
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set_extent_delalloc(&tmp, 4096, max_bytes - 1, NULL, GFP_NOFS);
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start = test_start;
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end = 0;
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found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
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&end, max_bytes);
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if (!found) {
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test_msg("Couldn't find delalloc in our range\n");
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goto out_bits;
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}
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if (start != test_start || end != max_bytes - 1) {
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test_msg("Expected start %Lu end %Lu, got start %Lu, end "
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"%Lu\n", test_start, max_bytes - 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,
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PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
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test_msg("There were unlocked pages in the range\n");
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goto out_bits;
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}
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unlock_extent(&tmp, start, end);
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/* locked_page was unlocked above */
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page_cache_release(locked_page);
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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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test_start = max_bytes + 4096;
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locked_page = find_lock_page(inode->i_mapping, test_start >>
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PAGE_CACHE_SHIFT);
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if (!locked_page) {
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test_msg("Could'nt find the locked page\n");
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goto out_bits;
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}
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start = test_start;
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end = 0;
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found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
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&end, max_bytes);
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if (found) {
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test_msg("Found range when we shouldn't have\n");
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goto out_bits;
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}
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if (end != (u64)-1) {
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test_msg("Did not return the proper end offset\n");
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goto out_bits;
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}
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/*
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* Test this scenario
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* [------- delalloc -------|
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* [max_bytes]|-- search--|
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*
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* We are re-using our test_start from above since it works out well.
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*/
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set_extent_delalloc(&tmp, max_bytes, total_dirty - 1, NULL, GFP_NOFS);
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start = test_start;
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end = 0;
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found = find_lock_delalloc_range(inode, &tmp, locked_page, &start,
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&end, max_bytes);
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if (!found) {
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test_msg("Didn't find our range\n");
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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_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
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test_start, total_dirty - 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,
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PROCESS_TEST_LOCKED | PROCESS_UNLOCK)) {
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test_msg("Pages in range were not all locked\n");
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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, (max_bytes + (1 * 1024 * 1024))
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>> PAGE_CACHE_SHIFT);
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if (!page) {
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test_msg("Couldn't find our page\n");
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goto out_bits;
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}
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ClearPageDirty(page);
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page_cache_release(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_CACHE_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, &tmp, locked_page, &start,
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&end, max_bytes);
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if (!found) {
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test_msg("Didn't find our range\n");
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goto out_bits;
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}
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if (start != test_start && end != test_start + PAGE_CACHE_SIZE - 1) {
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test_msg("Expected start %Lu end %Lu, got start %Lu end %Lu\n",
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test_start, test_start + PAGE_CACHE_SIZE - 1, start,
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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 |
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PROCESS_UNLOCK)) {
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test_msg("Pages in range were not all locked\n");
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goto out_bits;
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}
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ret = 0;
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out_bits:
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clear_extent_bits(&tmp, 0, total_dirty - 1, (unsigned)-1, GFP_NOFS);
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out:
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if (locked_page)
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page_cache_release(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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int btrfs_test_extent_io(void)
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{
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test_msg("Running find delalloc tests\n");
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return test_find_delalloc();
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}
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