fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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Sagar Vemuri b1dad4cfcc assert in PosixEnv::FileExists should be based on errno (#4427) ... Summary: The assert in PosixEnv::FileExists is currently based on the return value of `access` syscall. Instead it should be based on errno. Initially I wanted to remove this assert as [`access`](https://linux.die.net/man/2/access) can error out in a few other cases (like EROFS). But on thinking more it feels like the assert is doing the right thing ... its good to crash on EROFS, EFAULT, EINVAL, and other major filesystem related problems so that the user is immediately aware of the problems while testing. (I think it might be ok to crash on EIO as well, but there might be a specific reason why it was decided not to crash for EIO, and I don't have that context. So letting the letting the assert checks remain as is for now). Pull Request resolved: https://github.com/facebook/rocksdb/pull/4427 Differential Revision: D10037200 Pulled By: sagar0 fbshipit-source-id: 5cc96116a2e53cef701f444a8b5290576f311e51		6 years ago
..
env.cc	Apply use_direct_io_for_flush_and_compaction to writes only	7 years ago
env_basic_test.cc	Per-thread unique test db names (#4135)	6 years ago
env_chroot.cc	Change RocksDB License	7 years ago
env_chroot.h	Change RocksDB License	7 years ago
env_encryption.cc	Fix some typos in comments and docs.	7 years ago
env_hdfs.cc	Disallow compactions if there isn't enough free space	7 years ago
env_posix.cc	assert in PosixEnv::FileExists should be based on errno (#4427)	6 years ago
env_test.cc	Per-thread unique test db names (#4135)	6 years ago
io_posix.cc	Assert for Direct IO at the beginning in PositionedRead (#3891)	6 years ago
io_posix.h	Second attempt at db_stress crash-recovery verification	7 years ago
mock_env.cc	Support pragma once in all header files and cleanup some warnings (#4339)	6 years ago
mock_env.h	Add virtual Truncate method to Env	7 years ago
mock_env_test.cc	Move some files under util/ to separate dirs	8 years ago
posix_logger.h	Auto recovery from out of space errors (#4164)	6 years ago