I''m going to be removing hole extents in the near future so I wanted to
make a
sanity test for btrfs_get_extent to make sure I don''t break anything in
the
meantime. This patch just puts btrfs_get_extent through its paces by giving it
a completely unreasonable mapping to look at and make sure it is giving us back
maps that make sense. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
---
V1->V2:
-typo in the non-sanity checking case
fs/btrfs/Makefile | 3 +-
fs/btrfs/ctree.h | 4 +
fs/btrfs/inode.c | 8 +
fs/btrfs/super.c | 3 +
fs/btrfs/tests/btrfs-tests.c | 8 +-
fs/btrfs/tests/btrfs-tests.h | 5 +
fs/btrfs/tests/inode-tests.c | 832 +++++++++++++++++++++++++++++++++++++++++++
7 files changed, 861 insertions(+), 2 deletions(-)
create mode 100644 fs/btrfs/tests/inode-tests.c
diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
index cac4f2d..1a44e42 100644
--- a/fs/btrfs/Makefile
+++ b/fs/btrfs/Makefile
@@ -15,4 +15,5 @@ btrfs-$(CONFIG_BTRFS_FS_POSIX_ACL) += acl.o
btrfs-$(CONFIG_BTRFS_FS_CHECK_INTEGRITY) += check-integrity.o
btrfs-$(CONFIG_BTRFS_FS_RUN_SANITY_TESTS) += tests/free-space-tests.o \
- tests/extent-buffer-tests.o tests/btrfs-tests.o tests/extent-io-tests.o
+ tests/extent-buffer-tests.o tests/btrfs-tests.o \
+ tests/extent-io-tests.o tests/inode-tests.o
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2f39806..9f5e1cf 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -4034,5 +4034,9 @@ static inline int btrfs_defrag_cancelled(struct
btrfs_fs_info *fs_info)
return signal_pending(current);
}
+/* Sanity test specific functions */
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+void btrfs_test_destroy_inode(struct inode *inode);
+#endif
#endif
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index d468246..09c950b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7794,6 +7794,14 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
return inode;
}
+#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
+void btrfs_test_destroy_inode(struct inode *inode)
+{
+ btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
+ kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
+}
+#endif
+
static void btrfs_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2bdaafd..db591e8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1802,6 +1802,9 @@ static int btrfs_run_sanity_tests(void)
if (ret)
goto out;
ret = btrfs_test_extent_io();
+ if (ret)
+ goto out;
+ ret = btrfs_test_inodes();
out:
btrfs_destroy_test_fs();
return ret;
diff --git a/fs/btrfs/tests/btrfs-tests.c b/fs/btrfs/tests/btrfs-tests.c
index 697d527..757ef00 100644
--- a/fs/btrfs/tests/btrfs-tests.c
+++ b/fs/btrfs/tests/btrfs-tests.c
@@ -24,11 +24,17 @@
static struct vfsmount *test_mnt = NULL;
+static const struct super_operations btrfs_test_super_ops = {
+ .alloc_inode = btrfs_alloc_inode,
+ .destroy_inode = btrfs_test_destroy_inode,
+};
+
static struct dentry *btrfs_test_mount(struct file_system_type *fs_type,
int flags, const char *dev_name,
void *data)
{
- return mount_pseudo(fs_type, "btrfs_test:", NULL, NULL,
BTRFS_TEST_MAGIC);
+ return mount_pseudo(fs_type, "btrfs_test:",
&btrfs_test_super_ops,
+ NULL, BTRFS_TEST_MAGIC);
}
static struct file_system_type test_type = {
diff --git a/fs/btrfs/tests/btrfs-tests.h b/fs/btrfs/tests/btrfs-tests.h
index e935fe5..b353bc8 100644
--- a/fs/btrfs/tests/btrfs-tests.h
+++ b/fs/btrfs/tests/btrfs-tests.h
@@ -26,6 +26,7 @@
int btrfs_test_free_space_cache(void);
int btrfs_test_extent_buffer_operations(void);
int btrfs_test_extent_io(void);
+int btrfs_test_inodes(void);
int btrfs_init_test_fs(void);
void btrfs_destroy_test_fs(void);
struct inode *btrfs_new_test_inode(void);
@@ -49,6 +50,10 @@ static inline int btrfs_test_extent_io(void)
{
return 0;
}
+static inline int btrfs_test_inodes(void)
+{
+ return 0;
+}
#endif
#endif
diff --git a/fs/btrfs/tests/inode-tests.c b/fs/btrfs/tests/inode-tests.c
new file mode 100644
index 0000000..92416b3
--- /dev/null
+++ b/fs/btrfs/tests/inode-tests.c
@@ -0,0 +1,832 @@
+/*
+ * 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 struct btrfs_fs_info *alloc_dummy_fs_info(void)
+{
+ struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
+ GFP_NOFS);
+ if (!fs_info)
+ return fs_info;
+ fs_info->fs_devices = kzalloc(sizeof(struct btrfs_fs_devices),
+ GFP_NOFS);
+ if (!fs_info->fs_devices) {
+ kfree(fs_info);
+ return NULL;
+ }
+ return fs_info;
+}
+static void free_dummy_root(struct btrfs_root *root)
+{
+ if (!root)
+ return;
+ if (root->fs_info) {
+ kfree(root->fs_info->fs_devices);
+ kfree(root->fs_info);
+ }
+ if (root->node)
+ free_extent_buffer(root->node);
+ kfree(root);
+}
+
+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);
+}
+
+/*
+ * 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;
+
+ set_bit(EXTENT_FLAG_COMPRESSED, &compressed_only);
+ set_bit(EXTENT_FLAG_VACANCY, &vacancy_only);
+ set_bit(EXTENT_FLAG_PREALLOC, &prealloc_only);
+
+ 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 = 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 %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != 0 || em->len != 5) {
+ test_msg("Unexpected extent wanted start 0 len 5, got start "
+ "%Lu len %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4091) {
+ test_msg("Unexpected extent wanted start %Lu len 1, got start "
+ "%Lu len %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4) {
+ test_msg("Unexpected extent wanted start %Lu len 4, got start "
+ "%Lu len %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4095) {
+ test_msg("Unexpected extent wanted start %Lu len 4095, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 8192) {
+ test_msg("Unexpected extent wanted start %Lu len 8192, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 8192) {
+ test_msg("Unexpected extent wanted start %Lu len 8192, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 8192) {
+ test_msg("Unexpected extent wanted start %Lu len 8192, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu got %Lu\n",
+ disk_bytenr, em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 8192) {
+ test_msg("Unexpected extent wanted start %Lu len 8192, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\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 %Lu len 12288, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\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 %Lu\n", em->block_start);
+ goto out;
+ }
+ if (em->start != offset || em->len != 4096) {
+ test_msg("Unexpected extent wanted start %Lu len 4096, got "
+ "start %Lu len %Lu\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 %Lu, have %Lu\n", em->start,
+ em->orig_start);
+ goto out;
+ }
+ ret = 0;
+out:
+ if (!IS_ERR(em))
+ free_extent_map(em);
+ iput(inode);
+ free_dummy_root(root);
+ return ret;
+}
+
+int btrfs_test_inodes(void)
+{
+ test_msg("Running btrfs_get_extent tests\n");
+ return test_btrfs_get_extent();
+}
--
1.8.3.1
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