DB Sanity Test

Summary:
@kailiu mentioned on meeting yesterday that we sometimes have trouble opening DB created by old version with the new version. This will be very important to test for column families, since I'm changing disk format for the MANIFEST.

I added a tool that can help us test that. Usage:
./db_sanity_test <path> create
will create a bunch of DBs under <path>
<change RocksDB version>
./db_sanity_test <path> verify
will verify consistency of DBs created under <path>

Test Plan: ran the db_sanity_test

Reviewers: kailiu, dhruba, haobo

Reviewed By: kailiu

CC: leveldb, kailiu, xjin

Differential Revision: https://reviews.facebook.net/D16605
Truncate unused space on PosixWritableFile::Close()

Summary:
Blocks allocated with fallocate will take extra space on disk even if they are unused and the file is close.

Now we remove the extra blocks at the end of the file by calling `ftruncate`.

Test Plan: added a test to env_test

Reviewers: dhruba

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16647
Fix Valgrind error introduced by D16515

Summary: valgrind reports issues. This patch seems to fix it.

Test Plan: run the tests that fails in valgrind

Reviewers: igor, haobo, kailiu

Reviewed By: kailiu

CC: dhruba, ljin, yhchiang, leveldb

Differential Revision: https://reviews.facebook.net/D16653
More precise calculation of sub_index_size

Summary:
Previous we did rough estimation of subindex size, which in worst case may result in array reallocation.
This patch aims to get the exact size and avoid any reallocation.

Test Plan: make all check

Reviewers: sdong, dhruba, haobo

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16125
Delete local sv when destroying DB from stress test

Summary: Not deleting local SV caused some an crash test issue: http://ci-builds.fb.com/job/rocksdb_asan_crash_test/83/console

Test Plan: ran unit tests

Reviewers: ljin

Reviewed By: ljin

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16635
Modify the compile error about ftruncate()

Summary:
Change to store the return value from ftruncate().
The reason is that ftruncate() has "warn_unused_result" attribute in some environment.

Signed-off-by: Yumikiyo Osanai <yumios.art@gmail.com>
Merge pull request #94 from yumiOS/modify_ftruncate_warning

Modify the compile error about ftruncate()
use CAS when returning SuperVersion to ThreadLocal

Summary:
Add a check at the end of GetImpl to release SuperVersion if it becomes
obsolete. Also do Scrape() inside InstallSuperVersion so it happens more
frequent.

Test Plan:
make all check
running asan_check now

Reviewers: igor, haobo, sdong, dhruba

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D16641
Merge branch 'master' into columnfamilies

Conflicts:
	db/db_impl.cc
	db/db_impl.h