• fixed errors introduced in 1.6.9
• added 'reload' command to master
• split chunk counters into 'all' and 'regular' (new approach to disks removal - since this version chunks on 'marked for removal' disks are not deleted)

• fixed errors introduced in 1.6.5
• changed directory structure in CS (from 16 subfolders to 256 subfolders)

• rewrite mfs to use poll instead of select
• fixed some errors in new write module
• limit cache usage by inode in write module

• fixed "race" in writedata module 
• increased session timeout in mfsmaster for new sessions

Common:

• Removed duplicate source files.
• Whitespace at the end of lines in configuration files do not produce errors

Chunkserver:

• New -v option (prints version and exits).
• The module has been rewritten from scratch and now has a multithreaded architecture.
• A new module for testing chunkservers has been introduced. Also, a new parameter in mfschunkserver.cfg file has been added, i.e. HDD_TEST_FREQ - which defines interval in seconds between tests. Setting variable to 0 disables chunkserver tests. The default value is 10.

Master:

• New -v option (prints version and exits).
• A new functionality of creating "atomic snapshots" of entire folders has been introduced.
• A new flag noowner along with mfssetnoownerflag, mfsgetnoownerflag and mfsdelnoownerflag tools has been introduced. If any object in the tree has this flag on, then this object and all its children belong to the current user (the file uid and gid is equal to uid and gid of current user). User with uid 0 can see original uids and gids of the files.
• Maintaining mfsdirinfo data online, so it doesn't need to be calculated on every request (now the mfsdirinfo tool doesn't block Master when big trees are used).
• Filesystem access authorization system

All clients older than 1.5.14 connect using the old protocol version and access management is not available for them (at the transitional stage they have access to every resource). But you can set the option "REJECT_OLD_CLIENTS" to 1, so that the Master will not accept connections from clients older than 1.5.14 (the default value of this option is 0).

For new clients (version 1.5.14 and above), there is a new file mfsexports.cfg in etc. The format of mfsexports.cfg is:

ADDRESSES FOLDER [OPTIONS]

ADDRESSES

•   all addresses

  n.n.n.n - one IP address

  n.n.n.n/b - IP subnet defined by network address and number of bits

  n.n.n.n/m.m.m.m - IP subnet defined by network address and netmask

  f.f.f.f - t.t.t.t - IP range from-to

FOLDER signifies the subfolder accessible to users from specified addresses. The path doesn't need to start from '/' but if you want to give access to the whole tree you should use a single '/' sign. One dot '.' signifies access to META resources.

OPTIONS

• ro or readonly - signifies readonly access (default)

• rw or readwrite - signifies access for reading and writing

• ignoregid - disables group check when checking access rights; when file uid is the same as uid of current user, then the owner rights are checked (normally), otherwise group and others' rights connected by "OR" statement are checked. When this option is used, checking rights is disabled only by the Master, mfsmount still uses standard privileges. Generally, the option is used to ensure that rights of users belonging to different groups work properly (FUSE passes only the main user group).

• dynamicip - enables a user to reconnect from the same IP addresses. Normally, when a connection is broken between the client and the master, the client after reconnection shows only session id and based on this information is allowed to enter or not. In order to prevent stealing others' sessions, the master checks the client's IP and allows connections only from the same IP address. In some (rather rare) cases, such prevention may be reasonable and then enabling this option is recommended.

• maproot=USER[:GROUP] - works the same way as in NFS. All accesses with uid equal to 0 are remapped to USER access in the GROUP group. Both USER and GROUP can be entered as a string or as a number. When GROUP is not given, the system assumes the base group of the user.

• minversion=VER - Restricts access to a given resource only to clients with version passed in this option or above. VER consists of numbers separated by one to three dots, e.g. 1.5.14 means that minimal version is 1.5.14 and 1.6 means 1.6.0.

• password=PASS or md5pass=MD5 - The system will require the password in order to give access to a given resource.

• alldirs - Allows mounting of any subfolder of a given folder (the same way as in NFS)

Default options are: ro,maproot=999,999

mfsmaster reacts to SIGHUP signal which reloads "mfsexports.cfg" file. Existing connections keep working with the same rights as during authorisation.

Mount:

• Rewritten options parsing in mount-like way, making possible to use standard FUSE mount utilities (see mfsmount(8) manual for new syntax). Note: old syntax is no longer accepted and mountpoint is mandatory now (there is no default).
• Updated for FUSE 2.6+.
• Added password, file data cache, attribute cache and entry cache options. By default attribute cache and directory entry cache are enabled, file data cache and file entry cache are disabled.
• opendir() no longer reads directory contents - it's done on first readdir() now; fixes rm -r on recent Linux/glibc/coreutils combo.
• Fixed mtime setting just before close() (by flushing file on mtime change); fixes mtime preserving on cp -p.
• Added statistics accessible through MFSROOT/.stats pseudo-file.
• Changed master access method for mfstools (direct .master pseudo-file replaced by .masterinfo redirection); fixes possible mfstools race condition and allows to use mfstools on read-only filesystem.

Tools:

• Units cleanup in values display (exact values, IEC-60027/binary prefixes, SI/decimal prefixes); new options: -n, -h, -H and MFSHRFORMAT environment variable - refer to mfstools(8) manual for details).
• mfsrgetgoal, mfsrsetgoal, mfsrgettrashtime, mfsrsettrashtime have been deprecated in favour of new "-r" option for mfsgetgoal, mfssetgoal, mfsgettrashtime, mfssettrashtime tools.
• mfssnapshot utility replaced by mfsappendchunks (direct descendant of old utility) and mfsmakesnapshot (which creates "real" recursive snapshots and behaves similar to cp -r).
• New mfsfilerepair utility, which allows partial recovery of file with some missing or broken chunks.

CGI scripts:

• First public version of CGI scripts allowing to monitor MFS installation from WWW browser.