Don't change mc_dbx because we would need to undo the change if
the txn aborts. Make the fix (for get) match existing code for put.

This reverts commit 47c4e747.

Revert "ITS#8117 fix INTEGERDUP compare"

This reverts commit ba45e0c0.

Fix mdb_txn_begin(&read-only txn) calls. Test mdb_env_set_maxreaders().
Rename DBI open/close functions. Move mdb_dbi_close() out of txn.

(Probably fixes the ITS, definitely fixes a bug) when collapsing
the root page, fixups of other cursors was incomplete.

Copied from 58ddb552.

Leonid Yuriev authored 10 years ago and Hallvard Furuseth committed 10 years ago

Inconsistent reading & SIGSEGV due to the race condition.

Leonid Yuriev authored 10 years ago and Hallvard Furuseth committed 10 years ago

Globally shared fields of meta-data were not 'volatile'.
Code from 9a80a8a8,
except the unportable __synchronize().

Check for ext3/ext4 fs, then check kernel version.

This reverts commit e95c9231.

Revert "Hack for potential ext3/ext4 corruption issue"

This reverts commit 91155b9d.

Use regular fsync() if we think this commit grew the DB file.

We actually compare the new key against the last key, to prevent
corruption.