9ed8d704dd
When a file is opened twice concurrently, we can end up with two separate FileNodes for a single path. This seems to be the root cause for the crashes reported under https://github.com/vgough/encfs/issues/214 , as commit af64702dd0c5be3a2434d670f9e3dbb803f3e388 "Simplify FileNode Cache. Remove the need for PlaceHolder." removed the awareness for different FileNodes. The crashes have been fixed by e2f0f8e3c68604a46d8665c3b0125bb35a0d9181 "fuseFhMap: translate FUSE file handles to FileNode pointers" at the cost of introducing a memory leak. One of the two FileNodes would stay in fuseFhMap forever. This commit makes eraseNode again aware of different FileNodes for a single path, makes sure the right FileNode is erased, and fixes the memory leak.
EncFS - an Encrypted Filesystem
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About
EncFS provides an encrypted filesystem in user-space. It runs in userspace, using the FUSE library for the filesystem interface. EncFS is open source software, licensed under the LGPL.
EncFS is now over 10 years old (first release in 2003). It was written because older NFS and kernel-based encrypted filesystems such as CFS had not kept pace with Linux development. When FUSE became available, I wrote a CFS replacement for my own use and released the first version to Open Source in 2003.
EncFS encrypts individual files, by translating all requests for the virtual EncFS filesystem into the equivalent encrypted operations on the raw filesystem.
For more info, see:
- The excellent encfs manpage
- The technical overview in DESIGN.md
Status
Over the last 10 years, a number of good alternatives have grown up. Computing power has increased to the point where it is reasonable to encrypt the entire filesystem of personal computers (and even mobile phones!). On Linux, ecryptfs provides a nice dynamically mountable encrypted home directory, and is well integrated in distributions I use, such as Ubuntu.
EncFS has been dormant for a while. I've started cleaning up in order to try and provide a better base for a version 2, but whether EncFS flowers again depends upon community interest. In order to make it easier for anyone to contribute, it is moving a new home on Github. So if you're interested in EncFS, please dive in!
Unique Features
EncFS has a few features still not found anywhere else (as of Dec 2014) that may be interesing to you:
Reverse mode
encfs --reverse provides an encrypted view of an unencrypted folder.
This enables encrypted remote backups using standard tools like rsync.
Fast on classical HDDs
EncFS is typically much faster than ecryptfs for stat()-heavy workloads when the backing device is a classical hard disk. This is because ecryptfs has to to read each file header to determine the file size - EncFS does not. This is one additional seek for each stat. See PERFORMANCE.md for detailed benchmarks on HDD, SSD and ramdisk.
Works on top of network filesystems
EncFS works on network file systems (NFS, CIFS...), while ecryptfs is known to still have problems.
Development
The master branch contains the latest stable codebase. This is where bug fixes and improvments should go.
The dev branch contains experimental work, some of which may be back-ported to the master branch when it is stable. The dev branch is not stable, and there is no guarantee of backward compatibility between changes.
Donations
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