- 根目录:
- fs
- btrfs
- tests
- inode-tests.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 "btrfs-tests.h"
#include "../ctree.h"
#include "../btrfs_inode.h"
#include "../disk-io.h"
#include "../extent_io.h"
#include "../volumes.h"
static void insert_extent(struct btrfs_root *root, u64 start, u64 len,
u64 ram_bytes, u64 offset, u64 disk_bytenr,
u64 disk_len, u32 type, u8 compression, int slot)
{
struct btrfs_path path;
struct btrfs_file_extent_item *fi;
struct extent_buffer *leaf = root->node;
struct btrfs_key key;
u32 value_len = sizeof(struct btrfs_file_extent_item);
if (type == BTRFS_FILE_EXTENT_INLINE)
value_len += len;
memset(&path, 0, sizeof(path));
path.nodes[0] = leaf;
path.slots[0] = slot;
key.objectid = BTRFS_FIRST_FREE_OBJECTID;
key.type = BTRFS_EXTENT_DATA_KEY;
key.offset = start;
setup_items_for_insert(root, &path, &key, &value_len, value_len,
value_len + sizeof(struct btrfs_item), 1);
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
btrfs_set_file_extent_generation(leaf, fi, 1);
btrfs_set_file_extent_type(leaf, fi, type);
btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr);
btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_len);
btrfs_set_file_extent_offset(leaf, fi, offset);
btrfs_set_file_extent_num_bytes(leaf, fi, len);
btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes);
btrfs_set_file_extent_compression(leaf, fi, compression);
btrfs_set_file_extent_encryption(leaf, fi, 0);
btrfs_set_file_extent_other_encoding(leaf, fi, 0);
}
static void insert_inode_item_key(struct btrfs_root *root)
{
struct btrfs_path path;
struct extent_buffer *leaf = root->node;
struct btrfs_key key;
u32 value_len = 0;
memset(&path, 0, sizeof(path));
path.nodes[0] = leaf;
path.slots[0] = 0;
key.objectid = BTRFS_INODE_ITEM_KEY;
key.type = BTRFS_INODE_ITEM_KEY;
key.offset = 0;
setup_items_for_insert(root, &path, &key, &value_len, value_len,
value_len + sizeof(struct btrfs_item), 1);
}
/*
* Build the most complicated map of extents the earth has ever seen. We want
* this so we can test all of the corner cases of btrfs_get_extent. Here is a
* diagram of how the extents will look though this may not be possible we still
* want to make sure everything acts normally (the last number is not inclusive)
*
* [0 - 5][5 - 6][6 - 10][10 - 4096][ 4096 - 8192 ][8192 - 12288]
* [hole ][inline][ hole ][ regular ][regular1 split][ hole ]
*
* [ 12288 - 20480][20480 - 24576][ 24576 - 28672 ][28672 - 36864][36864 - 45056]
* [regular1 split][ prealloc1 ][prealloc1 written][ prealloc1 ][ compressed ]
*
* [45056 - 49152][49152-53248][53248-61440][61440-65536][ 65536+81920 ]
* [ compressed1 ][ regular ][compressed1][ regular ][ hole but no extent]
*
* [81920-86016]
* [ regular ]
*/
static void setup_file_extents(struct btrfs_root *root)
{
int slot = 0;
u64 disk_bytenr = 1 * 1024 * 1024;
u64 offset = 0;
/* First we want a hole */
insert_extent(root, offset, 5, 5, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
slot);
slot++;
offset += 5;
/*
* Now we want an inline extent, I don't think this is possible but hey
* why not? Also keep in mind if we have an inline extent it counts as
* the whole first page. If we were to expand it we would have to cow
* and we wouldn't have an inline extent anymore.
*/
insert_extent(root, offset, 1, 1, 0, 0, 0, BTRFS_FILE_EXTENT_INLINE, 0,
slot);
slot++;
offset = 4096;
/* Now another hole */
insert_extent(root, offset, 4, 4, 0, 0, 0, BTRFS_FILE_EXTENT_REG, 0,
slot);
slot++;
offset += 4;
/* Now for a regular extent */
insert_extent(root, offset, 4095, 4095, 0, disk_bytenr, 4096,
BTRFS_FILE_EXTENT_REG, 0, slot);
slot++;
disk_bytenr += 4096;
offset += 4095;
/*
* Now for 3 extents that were split from a hole punch so we test
* offsets properly.
*/
insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 16384,
BTRFS_FILE_EXTENT_REG, 0, slot);
slot++;
offset += 4096;
insert_extent(root, offset, 4096, 4096, 0, 0, 0, BTRFS_FILE_EXTENT_REG,
0, slot);
slot++;
offset += 4096;
insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 16384,
BTRFS_FILE_EXTENT_REG, 0, slot);
slot++;
offset += 8192;
disk_bytenr += 16384;
/* Now for a unwritten prealloc extent */
insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
slot++;
offset += 4096;
/*
* We want to jack up disk_bytenr a little more so the em stuff doesn't
* merge our records.
*/
disk_bytenr += 8192;
/*
* Now for a partially written prealloc extent, basically the same as
* the hole punch example above. Ram_bytes never changes when you mark
* extents written btw.
*/
insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 16384,
BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
slot++;
offset += 4096;
insert_extent(root, offset, 4096, 16384, 4096, disk_bytenr, 16384,
BTRFS_FILE_EXTENT_REG, 0, slot);
slot++;
offset += 4096;
insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 16384,
BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
slot++;
offset += 8192;
disk_bytenr += 16384;
/* Now a normal compressed extent */
insert_extent(root, offset, 8192, 8192, 0, disk_bytenr, 4096,
BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
slot++;
offset += 8192;
/* No merges */
disk_bytenr += 8192;
/* Now a split compressed extent */
insert_extent(root, offset, 4096, 16384, 0, disk_bytenr, 4096,
BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
slot++;
offset += 4096;
insert_extent(root, offset, 4096, 4096, 0, disk_bytenr + 4096, 4096,
BTRFS_FILE_EXTENT_REG, 0, slot);
slot++;
offset += 4096;
insert_extent(root, offset, 8192, 16384, 8192, disk_bytenr, 4096,
BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
slot++;
offset += 8192;
disk_bytenr += 8192;
/* Now extents that have a hole but no hole extent */
insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
BTRFS_FILE_EXTENT_REG, 0, slot);
slot++;
offset += 16384;
disk_bytenr += 4096;
insert_extent(root, offset, 4096, 4096, 0, disk_bytenr, 4096,
BTRFS_FILE_EXTENT_REG, 0, slot);
}
static unsigned long prealloc_only = 0;
static unsigned long compressed_only = 0;
static unsigned long vacancy_only = 0;
static noinline int test_btrfs_get_extent(void)
{
struct inode *inode = NULL;
struct btrfs_root *root = NULL;
struct extent_map *em = NULL;
u64 orig_start;
u64 disk_bytenr;
u64 offset;
int ret = -ENOMEM;
inode = btrfs_new_test_inode();
if (!inode) {
test_msg("Couldn't allocate inode\n");
return ret;
}
BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
BTRFS_I(inode)->location.offset = 0;
root = btrfs_alloc_dummy_root();
if (IS_ERR(root)) {
test_msg("Couldn't allocate root\n");
goto out;
}
/*
* We do this since btrfs_get_extent wants to assign em->bdev to
* root->fs_info->fs_devices->latest_bdev.
*/
root->fs_info = btrfs_alloc_dummy_fs_info();
if (!root->fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
goto out;
}
root->node = alloc_dummy_extent_buffer(0, 4096);
if (!root->node) {
test_msg("Couldn't allocate dummy buffer\n");
goto out;
}
/*
* We will just free a dummy node if it's ref count is 2 so we need an
* extra ref so our searches don't accidently release our page.
*/
extent_buffer_get(root->node);
btrfs_set_header_nritems(root->node, 0);
btrfs_set_header_level(root->node, 0);
ret = -EINVAL;
/* First with no extents */
BTRFS_I(inode)->root = root;
em = btrfs_get_extent(inode, NULL, 0, 0, 4096, 0);
if (IS_ERR(em)) {
em = NULL;
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_HOLE) {
test_msg("Expected a hole, got %llu\n", em->block_start);
goto out;
}
if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags)) {
test_msg("Vacancy flag wasn't set properly\n");
goto out;
}
free_extent_map(em);
btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
/*
* All of the magic numbers are based on the mapping setup in
* setup_file_extents, so if you change anything there you need to
* update the comment and update the expected values below.
*/
setup_file_extents(root);
em = btrfs_get_extent(inode, NULL, 0, 0, (u64)-1, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_HOLE) {
test_msg("Expected a hole, got %llu\n", em->block_start);
goto out;
}
if (em->start != 0 || em->len != 5) {
test_msg("Unexpected extent wanted start 0 len 5, got start "
"%llu len %llu\n", em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_INLINE) {
test_msg("Expected an inline, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4091) {
test_msg("Unexpected extent wanted start %llu len 1, got start "
"%llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
/*
* We don't test anything else for inline since it doesn't get set
* unless we have a page for it to write into. Maybe we should change
* this?
*/
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_HOLE) {
test_msg("Expected a hole, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4) {
test_msg("Unexpected extent wanted start %llu len 4, got start "
"%llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Regular extent */
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4095) {
test_msg("Unexpected extent wanted start %llu len 4095, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* The next 3 are split extents */
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
disk_bytenr = em->block_start;
orig_start = em->start;
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_HOLE) {
test_msg("Expected a hole, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 8192) {
test_msg("Unexpected extent wanted start %llu len 8192, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
orig_start, em->orig_start);
goto out;
}
disk_bytenr += (em->start - orig_start);
if (em->block_start != disk_bytenr) {
test_msg("Wrong block start, want %llu, have %llu\n",
disk_bytenr, em->block_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Prealloc extent */
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != prealloc_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
prealloc_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* The next 3 are a half written prealloc extent */
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != prealloc_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
prealloc_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
disk_bytenr = em->block_start;
orig_start = em->start;
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_HOLE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Unexpected orig offset, wanted %llu, have %llu\n",
orig_start, em->orig_start);
goto out;
}
if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
test_msg("Unexpected block start, wanted %llu, have %llu\n",
disk_bytenr + (em->start - em->orig_start),
em->block_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 8192) {
test_msg("Unexpected extent wanted start %llu len 8192, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != prealloc_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
prealloc_only, em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", orig_start,
em->orig_start);
goto out;
}
if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
test_msg("Unexpected block start, wanted %llu, have %llu\n",
disk_bytenr + (em->start - em->orig_start),
em->block_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Now for the compressed extent */
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 8192) {
test_msg("Unexpected extent wanted start %llu len 8192, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != compressed_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
compressed_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
em->start, em->orig_start);
goto out;
}
if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
test_msg("Unexpected compress type, wanted %d, got %d\n",
BTRFS_COMPRESS_ZLIB, em->compress_type);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* Split compressed extent */
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != compressed_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
compressed_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
em->start, em->orig_start);
goto out;
}
if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
test_msg("Unexpected compress type, wanted %d, got %d\n",
BTRFS_COMPRESS_ZLIB, em->compress_type);
goto out;
}
disk_bytenr = em->block_start;
orig_start = em->start;
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != disk_bytenr) {
test_msg("Block start does not match, want %llu got %llu\n",
disk_bytenr, em->block_start);
goto out;
}
if (em->start != offset || em->len != 8192) {
test_msg("Unexpected extent wanted start %llu len 8192, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != compressed_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
compressed_only, em->flags);
goto out;
}
if (em->orig_start != orig_start) {
test_msg("Wrong orig offset, want %llu, have %llu\n",
em->start, orig_start);
goto out;
}
if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
test_msg("Unexpected compress type, wanted %d, got %d\n",
BTRFS_COMPRESS_ZLIB, em->compress_type);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
/* A hole between regular extents but no hole extent */
em = btrfs_get_extent(inode, NULL, 0, offset + 6, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096 * 1024, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_HOLE) {
test_msg("Expected a hole extent, got %llu\n", em->block_start);
goto out;
}
/*
* Currently we just return a length that we requested rather than the
* length of the actual hole, if this changes we'll have to change this
* test.
*/
if (em->start != offset || em->len != 12288) {
test_msg("Unexpected extent wanted start %llu len 12288, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != vacancy_only) {
test_msg("Unexpected flags set, want %lu have %lu\n",
vacancy_only, em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
offset = em->start + em->len;
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, offset, 4096, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != offset || em->len != 4096) {
test_msg("Unexpected extent wanted start %llu len 4096, got "
"start %llu len %llu\n", offset, em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, want 0 have %lu\n", em->flags);
goto out;
}
if (em->orig_start != em->start) {
test_msg("Wrong orig offset, want %llu, have %llu\n", em->start,
em->orig_start);
goto out;
}
ret = 0;
out:
if (!IS_ERR(em))
free_extent_map(em);
iput(inode);
btrfs_free_dummy_root(root);
return ret;
}
static int test_hole_first(void)
{
struct inode *inode = NULL;
struct btrfs_root *root = NULL;
struct extent_map *em = NULL;
int ret = -ENOMEM;
inode = btrfs_new_test_inode();
if (!inode) {
test_msg("Couldn't allocate inode\n");
return ret;
}
BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY;
BTRFS_I(inode)->location.objectid = BTRFS_FIRST_FREE_OBJECTID;
BTRFS_I(inode)->location.offset = 0;
root = btrfs_alloc_dummy_root();
if (IS_ERR(root)) {
test_msg("Couldn't allocate root\n");
goto out;
}
root->fs_info = btrfs_alloc_dummy_fs_info();
if (!root->fs_info) {
test_msg("Couldn't allocate dummy fs info\n");
goto out;
}
root->node = alloc_dummy_extent_buffer(0, 4096);
if (!root->node) {
test_msg("Couldn't allocate dummy buffer\n");
goto out;
}
extent_buffer_get(root->node);
btrfs_set_header_nritems(root->node, 0);
btrfs_set_header_level(root->node, 0);
BTRFS_I(inode)->root = root;
ret = -EINVAL;
/*
* Need a blank inode item here just so we don't confuse
* btrfs_get_extent.
*/
insert_inode_item_key(root);
insert_extent(root, 4096, 4096, 4096, 0, 4096, 4096,
BTRFS_FILE_EXTENT_REG, 0, 1);
em = btrfs_get_extent(inode, NULL, 0, 0, 8192, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != EXTENT_MAP_HOLE) {
test_msg("Expected a hole, got %llu\n", em->block_start);
goto out;
}
if (em->start != 0 || em->len != 4096) {
test_msg("Unexpected extent wanted start 0 len 4096, got start "
"%llu len %llu\n", em->start, em->len);
goto out;
}
if (em->flags != vacancy_only) {
test_msg("Wrong flags, wanted %lu, have %lu\n", vacancy_only,
em->flags);
goto out;
}
free_extent_map(em);
em = btrfs_get_extent(inode, NULL, 0, 4096, 8192, 0);
if (IS_ERR(em)) {
test_msg("Got an error when we shouldn't have\n");
goto out;
}
if (em->block_start != 4096) {
test_msg("Expected a real extent, got %llu\n", em->block_start);
goto out;
}
if (em->start != 4096 || em->len != 4096) {
test_msg("Unexpected extent wanted start 4096 len 4096, got "
"start %llu len %llu\n", em->start, em->len);
goto out;
}
if (em->flags != 0) {
test_msg("Unexpected flags set, wanted 0 got %lu\n",
em->flags);
goto out;
}
ret = 0;
out:
if (!IS_ERR(em))
free_extent_map(em);
iput(inode);
btrfs_free_dummy_root(root);
return ret;
}
int btrfs_test_inodes(void)
{
int ret;
set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);
set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
test_msg("Running btrfs_get_extent tests\n");
ret = test_btrfs_get_extent();
if (ret)
return ret;
test_msg("Running hole first btrfs_get_extent test\n");
return test_hole_first();
}