v4.19.13 snapshot.
diff --git a/fs/btrfs/tests/inode-tests.c b/fs/btrfs/tests/inode-tests.c
new file mode 100644
index 0000000..64043f0
--- /dev/null
+++ b/fs/btrfs/tests/inode-tests.c
@@ -0,0 +1,1132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2013 Fusion IO. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include "btrfs-tests.h"
+#include "../ctree.h"
+#include "../btrfs_inode.h"
+#include "../disk-io.h"
+#include "../extent_io.h"
+#include "../volumes.h"
+#include "../compression.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 - 4096 ][ 4096 - 4100][4100 - 8195][8195 - 12291]
+ * [hole ][inline][hole but no extent][ hole ][ regular ][regular1 split]
+ *
+ * [12291 - 16387][16387 - 24579][24579 - 28675][ 28675 - 32771][32771 - 36867 ]
+ * [ hole ][regular1 split][ prealloc ][ prealloc1 ][prealloc1 written]
+ *
+ * [36867 - 45059][45059 - 53251][53251 - 57347][57347 - 61443][61443- 69635]
+ * [ prealloc1 ][ compressed ][ compressed1 ][ regular ][ compressed1]
+ *
+ * [69635-73731][ 73731 - 86019 ][86019-90115]
+ * [ regular ][ hole but no extent][ regular ]
+ */
+static void setup_file_extents(struct btrfs_root *root, u32 sectorsize)
+{
+ int slot = 0;
+ u64 disk_bytenr = SZ_1M;
+ 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 = sectorsize;
+
+ /* 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, sectorsize - 1, sectorsize - 1, 0,
+ disk_bytenr, sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
+ slot++;
+ disk_bytenr += sectorsize;
+ offset += sectorsize - 1;
+
+ /*
+ * Now for 3 extents that were split from a hole punch so we test
+ * offsets properly.
+ */
+ insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
+ 4 * sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
+ slot++;
+ offset += sectorsize;
+ insert_extent(root, offset, sectorsize, sectorsize, 0, 0, 0,
+ BTRFS_FILE_EXTENT_REG, 0, slot);
+ slot++;
+ offset += sectorsize;
+ insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
+ 2 * sectorsize, disk_bytenr, 4 * sectorsize,
+ BTRFS_FILE_EXTENT_REG, 0, slot);
+ slot++;
+ offset += 2 * sectorsize;
+ disk_bytenr += 4 * sectorsize;
+
+ /* Now for a unwritten prealloc extent */
+ insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
+ sectorsize, BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
+ slot++;
+ offset += sectorsize;
+
+ /*
+ * We want to jack up disk_bytenr a little more so the em stuff doesn't
+ * merge our records.
+ */
+ disk_bytenr += 2 * sectorsize;
+
+ /*
+ * 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, sectorsize, 4 * sectorsize, 0, disk_bytenr,
+ 4 * sectorsize, BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
+ slot++;
+ offset += sectorsize;
+ insert_extent(root, offset, sectorsize, 4 * sectorsize, sectorsize,
+ disk_bytenr, 4 * sectorsize, BTRFS_FILE_EXTENT_REG, 0,
+ slot);
+ slot++;
+ offset += sectorsize;
+ insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
+ 2 * sectorsize, disk_bytenr, 4 * sectorsize,
+ BTRFS_FILE_EXTENT_PREALLOC, 0, slot);
+ slot++;
+ offset += 2 * sectorsize;
+ disk_bytenr += 4 * sectorsize;
+
+ /* Now a normal compressed extent */
+ insert_extent(root, offset, 2 * sectorsize, 2 * sectorsize, 0,
+ disk_bytenr, sectorsize, BTRFS_FILE_EXTENT_REG,
+ BTRFS_COMPRESS_ZLIB, slot);
+ slot++;
+ offset += 2 * sectorsize;
+ /* No merges */
+ disk_bytenr += 2 * sectorsize;
+
+ /* Now a split compressed extent */
+ insert_extent(root, offset, sectorsize, 4 * sectorsize, 0, disk_bytenr,
+ sectorsize, BTRFS_FILE_EXTENT_REG,
+ BTRFS_COMPRESS_ZLIB, slot);
+ slot++;
+ offset += sectorsize;
+ insert_extent(root, offset, sectorsize, sectorsize, 0,
+ disk_bytenr + sectorsize, sectorsize,
+ BTRFS_FILE_EXTENT_REG, 0, slot);
+ slot++;
+ offset += sectorsize;
+ insert_extent(root, offset, 2 * sectorsize, 4 * sectorsize,
+ 2 * sectorsize, disk_bytenr, sectorsize,
+ BTRFS_FILE_EXTENT_REG, BTRFS_COMPRESS_ZLIB, slot);
+ slot++;
+ offset += 2 * sectorsize;
+ disk_bytenr += 2 * sectorsize;
+
+ /* Now extents that have a hole but no hole extent */
+ insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
+ sectorsize, BTRFS_FILE_EXTENT_REG, 0, slot);
+ slot++;
+ offset += 4 * sectorsize;
+ disk_bytenr += sectorsize;
+ insert_extent(root, offset, sectorsize, sectorsize, 0, disk_bytenr,
+ sectorsize, 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(u32 sectorsize, u32 nodesize)
+{
+ struct btrfs_fs_info *fs_info = NULL;
+ 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_err("couldn't allocate inode");
+ 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;
+
+ fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
+ if (!fs_info) {
+ test_err("couldn't allocate dummy fs info");
+ goto out;
+ }
+
+ root = btrfs_alloc_dummy_root(fs_info);
+ if (IS_ERR(root)) {
+ test_err("couldn't allocate root");
+ goto out;
+ }
+
+ root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
+ if (!root->node) {
+ test_err("couldn't allocate dummy buffer");
+ 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 accidentally 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(BTRFS_I(inode), NULL, 0, 0, sectorsize, 0);
+ if (IS_ERR(em)) {
+ em = NULL;
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != EXTENT_MAP_HOLE) {
+ test_err("expected a hole, got %llu", em->block_start);
+ goto out;
+ }
+ free_extent_map(em);
+ btrfs_drop_extent_cache(BTRFS_I(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, sectorsize);
+
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, 0, (u64)-1, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != EXTENT_MAP_HOLE) {
+ test_err("expected a hole, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != 0 || em->len != 5) {
+ test_err(
+ "unexpected extent wanted start 0 len 5, got start %llu len %llu",
+ em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != EXTENT_MAP_INLINE) {
+ test_err("expected an inline, got %llu", em->block_start);
+ goto out;
+ }
+
+ if (em->start != offset || em->len != (sectorsize - 5)) {
+ test_err(
+ "unexpected extent wanted start %llu len 1, got start %llu len %llu",
+ offset, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != EXTENT_MAP_HOLE) {
+ test_err("expected a hole, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4) {
+ test_err(
+ "unexpected extent wanted start %llu len 4, got start %llu len %llu",
+ offset, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ /* Regular extent */
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize - 1) {
+ test_err(
+ "unexpected extent wanted start %llu len 4095, got start %llu len %llu",
+ offset, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != EXTENT_MAP_HOLE) {
+ test_err("expected a hole, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 2 * sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, 2 * sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ if (em->orig_start != orig_start) {
+ test_err("wrong orig offset, want %llu, have %llu",
+ orig_start, em->orig_start);
+ goto out;
+ }
+ disk_bytenr += (em->start - orig_start);
+ if (em->block_start != disk_bytenr) {
+ test_err("wrong block start, want %llu, have %llu",
+ disk_bytenr, em->block_start);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ /* Prealloc extent */
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != prealloc_only) {
+ test_err("unexpected flags set, want %lu have %lu",
+ prealloc_only, em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != prealloc_only) {
+ test_err("unexpected flags set, want %lu have %lu",
+ prealloc_only, em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_HOLE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ if (em->orig_start != orig_start) {
+ test_err("unexpected orig offset, wanted %llu, have %llu",
+ orig_start, em->orig_start);
+ goto out;
+ }
+ if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
+ test_err("unexpected block start, wanted %llu, have %llu",
+ 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 2 * sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, 2 * sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != prealloc_only) {
+ test_err("unexpected flags set, want %lu have %lu",
+ prealloc_only, em->flags);
+ goto out;
+ }
+ if (em->orig_start != orig_start) {
+ test_err("wrong orig offset, want %llu, have %llu", orig_start,
+ em->orig_start);
+ goto out;
+ }
+ if (em->block_start != (disk_bytenr + (em->start - em->orig_start))) {
+ test_err("unexpected block start, wanted %llu, have %llu",
+ 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 2 * sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, 2 * sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != compressed_only) {
+ test_err("unexpected flags set, want %lu have %lu",
+ compressed_only, em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu",
+ em->start, em->orig_start);
+ goto out;
+ }
+ if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
+ test_err("unexpected compress type, wanted %d, got %d",
+ BTRFS_COMPRESS_ZLIB, em->compress_type);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ /* Split compressed extent */
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != compressed_only) {
+ test_err("unexpected flags set, want %lu have %lu",
+ compressed_only, em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu",
+ em->start, em->orig_start);
+ goto out;
+ }
+ if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
+ test_err("unexpected compress type, wanted %d, got %d",
+ 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(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", em->start,
+ em->orig_start);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != disk_bytenr) {
+ test_err("block start does not match, want %llu got %llu",
+ disk_bytenr, em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 2 * sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, 2 * sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != compressed_only) {
+ test_err("unexpected flags set, want %lu have %lu",
+ compressed_only, em->flags);
+ goto out;
+ }
+ if (em->orig_start != orig_start) {
+ test_err("wrong orig offset, want %llu, have %llu",
+ em->start, orig_start);
+ goto out;
+ }
+ if (em->compress_type != BTRFS_COMPRESS_ZLIB) {
+ test_err("unexpected compress type, wanted %d, got %d",
+ 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(BTRFS_I(inode), NULL, 0, offset + 6,
+ sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", em->start,
+ em->orig_start);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, SZ_4M, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != EXTENT_MAP_HOLE) {
+ test_err("expected a hole extent, got %llu", 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 != 3 * sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, 3 * sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != vacancy_only) {
+ test_err("unexpected flags set, want %lu have %lu",
+ vacancy_only, em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", em->start,
+ em->orig_start);
+ goto out;
+ }
+ offset = em->start + em->len;
+ free_extent_map(em);
+
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, offset, sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %llu len %u, got start %llu len %llu",
+ offset, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, want 0 have %lu", em->flags);
+ goto out;
+ }
+ if (em->orig_start != em->start) {
+ test_err("wrong orig offset, want %llu, have %llu", 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);
+ btrfs_free_dummy_fs_info(fs_info);
+ return ret;
+}
+
+static int test_hole_first(u32 sectorsize, u32 nodesize)
+{
+ struct btrfs_fs_info *fs_info = NULL;
+ 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_err("couldn't allocate inode");
+ 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;
+
+ fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
+ if (!fs_info) {
+ test_err("couldn't allocate dummy fs info");
+ goto out;
+ }
+
+ root = btrfs_alloc_dummy_root(fs_info);
+ if (IS_ERR(root)) {
+ test_err("couldn't allocate root");
+ goto out;
+ }
+
+ root->node = alloc_dummy_extent_buffer(fs_info, nodesize);
+ if (!root->node) {
+ test_err("couldn't allocate dummy buffer");
+ 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, sectorsize, sectorsize, sectorsize, 0, sectorsize,
+ sectorsize, BTRFS_FILE_EXTENT_REG, 0, 1);
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, 0, 2 * sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != EXTENT_MAP_HOLE) {
+ test_err("expected a hole, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != 0 || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start 0 len %u, got start %llu len %llu",
+ sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != vacancy_only) {
+ test_err("wrong flags, wanted %lu, have %lu", vacancy_only,
+ em->flags);
+ goto out;
+ }
+ free_extent_map(em);
+
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, sectorsize,
+ 2 * sectorsize, 0);
+ if (IS_ERR(em)) {
+ test_err("got an error when we shouldn't have");
+ goto out;
+ }
+ if (em->block_start != sectorsize) {
+ test_err("expected a real extent, got %llu", em->block_start);
+ goto out;
+ }
+ if (em->start != sectorsize || em->len != sectorsize) {
+ test_err(
+ "unexpected extent wanted start %u len %u, got start %llu len %llu",
+ sectorsize, sectorsize, em->start, em->len);
+ goto out;
+ }
+ if (em->flags != 0) {
+ test_err("unexpected flags set, wanted 0 got %lu",
+ em->flags);
+ goto out;
+ }
+ ret = 0;
+out:
+ if (!IS_ERR(em))
+ free_extent_map(em);
+ iput(inode);
+ btrfs_free_dummy_root(root);
+ btrfs_free_dummy_fs_info(fs_info);
+ return ret;
+}
+
+static int test_extent_accounting(u32 sectorsize, u32 nodesize)
+{
+ struct btrfs_fs_info *fs_info = NULL;
+ struct inode *inode = NULL;
+ struct btrfs_root *root = NULL;
+ int ret = -ENOMEM;
+
+ inode = btrfs_new_test_inode();
+ if (!inode) {
+ test_err("couldn't allocate inode");
+ return ret;
+ }
+
+ fs_info = btrfs_alloc_dummy_fs_info(nodesize, sectorsize);
+ if (!fs_info) {
+ test_err("couldn't allocate dummy fs info");
+ goto out;
+ }
+
+ root = btrfs_alloc_dummy_root(fs_info);
+ if (IS_ERR(root)) {
+ test_err("couldn't allocate root");
+ goto out;
+ }
+
+ BTRFS_I(inode)->root = root;
+ btrfs_test_inode_set_ops(inode);
+
+ /* [BTRFS_MAX_EXTENT_SIZE] */
+ ret = btrfs_set_extent_delalloc(inode, 0, BTRFS_MAX_EXTENT_SIZE - 1, 0,
+ NULL, 0);
+ if (ret) {
+ test_err("btrfs_set_extent_delalloc returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 1) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 1, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
+ ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE,
+ BTRFS_MAX_EXTENT_SIZE + sectorsize - 1,
+ 0, NULL, 0);
+ if (ret) {
+ test_err("btrfs_set_extent_delalloc returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 2) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 2, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /* [BTRFS_MAX_EXTENT_SIZE/2][sectorsize HOLE][the rest] */
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
+ BTRFS_MAX_EXTENT_SIZE >> 1,
+ (BTRFS_MAX_EXTENT_SIZE >> 1) + sectorsize - 1,
+ EXTENT_DELALLOC | EXTENT_DIRTY |
+ EXTENT_UPTODATE, 0, 0, NULL);
+ if (ret) {
+ test_err("clear_extent_bit returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 2) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 2, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /* [BTRFS_MAX_EXTENT_SIZE][sectorsize] */
+ ret = btrfs_set_extent_delalloc(inode, BTRFS_MAX_EXTENT_SIZE >> 1,
+ (BTRFS_MAX_EXTENT_SIZE >> 1)
+ + sectorsize - 1,
+ 0, NULL, 0);
+ if (ret) {
+ test_err("btrfs_set_extent_delalloc returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 2) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 2, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /*
+ * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize HOLE][BTRFS_MAX_EXTENT_SIZE+sectorsize]
+ */
+ ret = btrfs_set_extent_delalloc(inode,
+ BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize,
+ (BTRFS_MAX_EXTENT_SIZE << 1) + 3 * sectorsize - 1,
+ 0, NULL, 0);
+ if (ret) {
+ test_err("btrfs_set_extent_delalloc returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 4) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 4, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /*
+ * [BTRFS_MAX_EXTENT_SIZE+sectorsize][sectorsize][BTRFS_MAX_EXTENT_SIZE+sectorsize]
+ */
+ ret = btrfs_set_extent_delalloc(inode,
+ BTRFS_MAX_EXTENT_SIZE + sectorsize,
+ BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL, 0);
+ if (ret) {
+ test_err("btrfs_set_extent_delalloc returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 3) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 3, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree,
+ BTRFS_MAX_EXTENT_SIZE + sectorsize,
+ BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_UPTODATE, 0, 0, NULL);
+ if (ret) {
+ test_err("clear_extent_bit returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 4) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 4, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /*
+ * Refill the hole again just for good measure, because I thought it
+ * might fail and I'd rather satisfy my paranoia at this point.
+ */
+ ret = btrfs_set_extent_delalloc(inode,
+ BTRFS_MAX_EXTENT_SIZE + sectorsize,
+ BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1, 0, NULL, 0);
+ if (ret) {
+ test_err("btrfs_set_extent_delalloc returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents != 3) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 3, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+
+ /* Empty */
+ ret = clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_UPTODATE, 0, 0, NULL);
+ if (ret) {
+ test_err("clear_extent_bit returned %d", ret);
+ goto out;
+ }
+ if (BTRFS_I(inode)->outstanding_extents) {
+ ret = -EINVAL;
+ test_err("miscount, wanted 0, got %u",
+ BTRFS_I(inode)->outstanding_extents);
+ goto out;
+ }
+ ret = 0;
+out:
+ if (ret)
+ clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
+ EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_UPTODATE, 0, 0, NULL);
+ iput(inode);
+ btrfs_free_dummy_root(root);
+ btrfs_free_dummy_fs_info(fs_info);
+ return ret;
+}
+
+int btrfs_test_inodes(u32 sectorsize, u32 nodesize)
+{
+ int ret;
+
+ set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
+ set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
+
+ test_msg("running btrfs_get_extent tests");
+ ret = test_btrfs_get_extent(sectorsize, nodesize);
+ if (ret)
+ return ret;
+ test_msg("running hole first btrfs_get_extent test");
+ ret = test_hole_first(sectorsize, nodesize);
+ if (ret)
+ return ret;
+ test_msg("running outstanding_extents tests");
+ return test_extent_accounting(sectorsize, nodesize);
+}