/* * 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); memzero_extent_buffer(eb, 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) { struct btrfs_fs_info *fs_info; 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; fs_info = btrfs_alloc_dummy_fs_info(len, len); bitmap = kmalloc(len, GFP_KERNEL); if (!bitmap) { test_msg("Couldn't allocate test bitmap\n"); return -ENOMEM; } eb = __alloc_dummy_extent_buffer(fs_info, 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; }