lessfs & btier

Fixes a segfault that may occur when lessfs is used without transactions enabled. The segfault occurs when lessfs is unmounted after closing the databases. The impact of the bug is therefore low.

This release fixes some minor bugs that are related to logging only.

Lessfs now supports transactions which eliminates the need for fsck after a crash. Also new is the automatic execution of a custom script when the file system has less then a certain amount of free space left.

Lessfs with journaling.

Lately I have been working on a new version of lessfs. The exciting new feature is that it does not need fsck after a crash. It’s can always recover to the last checkpoint / steady state.

Would you like to know more? Drop an email.

Example: mounting lessfs after a crash.

Feb 14 11:39:01 saturn lessfs[5698]: The selected data store is file_io.
Feb 14 11:39:01 saturn lessfs[5698]: Lessfs uses a 24 bytes long hash.
Feb 14 11:39:01 saturn lessfs[5698]: Automatic defragmentation is enabled.
Feb 14 11:39:01 saturn lessfs[5698]: cache 4096 data blocks
Feb 14 11:39:01 saturn lessfs[5698]: The Blue Midnight Wish hash has been selected.
Feb 14 11:39:02 saturn lessfs[5701]: Lessfs has not been unmounted cleanly.
Feb 14 11:39:02 saturn lessfs[5701]: Rollback to : Sun Feb 14 11:33:33 2010

Example : mounting lessfs after a clean umount.

Feb 14 11:53:51 saturn lessfs[5926]: The selected data store is file_io.
Feb 14 11:53:51 saturn lessfs[5926]: Lessfs uses a 24 bytes long hash.
Feb 14 11:53:51 saturn lessfs[5926]: Automatic defragmentation is enabled.
Feb 14 11:53:51 saturn lessfs[5926]: cache 4096 data blocks
Feb 14 11:53:51 saturn lessfs[5926]: The Blue Midnight Wish hash has been selected.
Feb 14 11:53:51 saturn lessfs[5929]: The filesystem is clean.
Feb 14 11:53:51 saturn lessfs[5929]: Last used at : Sun Feb 14 11:53:48 2010

This fixes a rare race condition that can cause lessfs to segfault and crash.

Lessfs has finally made it to 1.0.0 And even better, sourceforge tells me that it’s now stable.

Only minor changes this release:

Added license information at the top of every file. Updated the license information for QuickLZ after contacting the author. And finally solved a bug where lessfs would crash upon defragmentation when the file_io backend had been selected.

Fixes an erroneous free() that can crash lessfs upon startup when the tiger hash is selected. Changes mklessfs so that it supports automatic directory creation and database overwrites. mklessfs now has improved error reporting. And some general code cleanups.

This version of lessfs has been scrutinized for memory leaks. Several small leaks have been fixed. One small issue with lessfs_utimes has also been solved.

This release fixes two memory leaks that are related to hardlink operations and one other memory leak in file_io.

It also solves a problem caused by not initializing st_[a/c/m]time.tv_nsec.
Thanks to Wolfgang Zuleger for doing a great job on analyzing these bugs.

This release fixes some problems where permissions where not properly set on open files. It also fixes a problem with an incorrect link count of directories. Performance for some meta data operations has also improved.

Working towards 1.0 stable…