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Allow I/O reliability checks using 16-bit checksums

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Checksums are set immediately prior to flush out of shared buffers
and checked when pages are read in again. Hint bit setting will
require full page write when block is dirtied, which causes various
infrastructure changes. Extensive comments, docs and README.

WARNING message thrown if checksum fails on non-all zeroes page;
ERROR thrown but can be disabled with ignore_checksum_failure = on.

Feature enabled by an initdb option, since transition from option off
to option on is long and complex and has not yet been implemented.
Default is not to use checksums.

Checksum used is WAL CRC-32 truncated to 16-bits.

Simon Riggs, Jeff Davis, Greg Smith
Wide input and assistance from many community members. Thank you.
This commit is contained in:
Simon Riggs
2013-03-22 13:54:07 +00:00
parent e4a05c7512
commit 96ef3b8ff1
40 changed files with 766 additions and 146 deletions
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3
src/include/storage/bufmgr.h
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@@ -195,6 +195,7 @@ extern void DropDatabaseBuffers(Oid dbid);
RelationGetNumberOfBlocksInFork(reln, MAIN_FORKNUM)
extern bool BufferIsPermanent(Buffer buffer);
extern XLogRecPtr BufferGetLSNAtomic(Buffer buffer);
#ifdef NOT_USED
extern void PrintPinnedBufs(void);
@@ -203,7 +204,7 @@ extern Size BufferShmemSize(void);
extern void BufferGetTag(Buffer buffer, RelFileNode *rnode,
ForkNumber *forknum, BlockNumber *blknum);
extern void SetBufferCommitInfoNeedsSave(Buffer buffer);
extern void MarkBufferDirtyHint(Buffer buffer);
extern void UnlockBuffers(void);
extern void LockBuffer(Buffer buffer, int mode);