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friendfs's Introduction

PREREQ:
The fuserl c driver has to be installed. You can find it here:
http://fuserl.googlecode.com/files/fuserldrv-2.0.3.tar.gz

If you are have root just follow the instructions and install it in the
default location. If you are not root or want to install the c driver
someplace else you need to update
lib/fuserl-2.0.5/src/fuserl.appSrc. The thing you need to change is
fuserldrvprefix from auto_detect to the path where you have the fuserl
c driver installed:

i.e. 
{env,[{fuserldrvprefix,"/home/lukas/fuserlcdrv/"}]}

INSTALL:
Just doing a make should be enough to install the system

make 

STARTING FRIENDFS:

First you need to configure friendfs
copy friendfs/doc/friendfs.conf.example to a good place

Set FRIENDFS_CONF to the path to the updated config file
If you put it as /etc/friendfs.conf or $HOME/.friendfs.conf
you dont need to set the FRIENDFS_CONF.

You then can start and connect to the erlang VM using the command:

scripts/friendfsctl start

USING FRIENDFS:

You wont have any fun without a mount point where you can put your
files. You create a mountpoint with:

scripts/friendfsctl mount <mountpoint> <options>

<options> is fs=<filesystem>

remember that /dir/to/mount/to has to exist before you can mount you
new friendfs filesystem into it!

You connect to the erlang VM by issuing this command:

scripts/friendfsctl shell

If you have any question rtfs!

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friendfs's Issues

Build doesn't work

Building friendfs according to instructions in README does not work:

~/friendfs$ make && make check_environment
make[1]: Entering directory `~/friendfs/lib/fuserl-2.0.5/src'
Compiling and loading fuserl.erl
Compiling and loading fuserlcodec.erl
Compiling and loading fuserlportable.erl
Compiling and loading fuserlsrv.erl
Compiling fuserl.app
make[1]: Leaving directory `~/friendfs/lib/fuserl-2.0.5/src'
make[1]: Entering directory `~/friendfs/lib/friendfs-0.1.0/src'
Compiling and loading ffs_fat.erl
./ffs_fat.erl:471: Warning: function get_path_to_inode/2 is unused
./ffs_fat.erl:473: Warning: function get_path_to_inode/3 is unused
./ffs_fat.erl:482: Warning: function path_parse/4 is unused
Compiling and loading ffs_filesystem.erl
Compiling and loading ffs_filesystem_sup.erl
Compiling and loading ffs_lib.erl
./ffs_lib.erl:44: Warning: function path_split/1 is unused
./ffs_lib.erl:47: Warning: function path_split/2 is unused
./ffs_lib.erl:56: Warning: function urlunsplit/1 is unused
./ffs_lib.erl:63: Warning: function urlunsplit_path/1 is unused
./ffs_lib.erl:206: Warning: function new_store/0 is unused
./ffs_lib.erl:208: Warning: function put_value/3 is unused
./ffs_lib.erl:210: Warning: function get_value/2 is unused
Compiling and loading ffs_mountpoint.erl
./ffs_mountpoint.erl:623: Warning: function to_unix/1 is unused
./ffs_mountpoint.erl:626: Warning: variable 'Gid' is unused
./ffs_mountpoint.erl:626: Warning: variable 'Uid' is unused
./ffs_mountpoint.erl:627: Warning: variable 'Atime' is unused
./ffs_mountpoint.erl:627: Warning: variable 'Mtime' is unused
./ffs_mountpoint.erl:628: Warning: variable 'Ctime' is unused
./ffs_mountpoint.erl:629: Warning: variable 'Size' is unused
Compiling and loading ffs_mountpoint_sup.erl
Compiling and loading ffs_storage_file.erl
./ffs_storage_file.erl:90: Warning: variable 'Offset' is unused
./ffs_storage_file.erl:141: Warning: function get_files_n_dirs/3 is unused
./ffs_storage_file.erl:146: Warning: variable 'RecAcc' is unused
Compiling and loading ffs_storage_mem.erl
Compiling and loading ffs_storage_mgr.erl
Compiling and loading ffs_storage_sup.erl
Compiling and loading filesystem.erl
Compiling and loading friendfs.erl
Compiling and loading friendfs_sup.erl
Compiling and loading ffs_config.erl
Compiling friendfs.app
rm ffs_config.erl
make[1]: Leaving directory `~/friendfs/lib/friendfs-0.1.0/src'
make[1]: Entering directory `~/friendfs/lib/fuserl-2.0.5/src'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `~/friendfs/lib/fuserl-2.0.5/src'
make[1]: Entering directory `~/friendfs/lib/friendfs-0.1.0/src'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `~/friendfs/lib/friendfs-0.1.0/src'
ln -s /vobs/otp/otp_delivery/sles10_32/erts-.o
cc   erts-.o   -o erts-
cc: erts-.o: No such file or directory
cc: no input files
make: *** [erts-] Error 1
rm erts-.o

Running the system afterwards yields:

~/friendfs$ scripts/friendfsctl start
scripts/friendfsctl: line 10: ./bin/start_friendfs: No such file or directory

Unmount/crash when mountpoint on NFS

If fuserl crashes/unmounts and the mountpoint is on a NFS the following error messages are displayed and the mountpoint folder is then unuable without a reboot.

umount: /home/qluclar/private/friendfs/ffs: block devices not permitted on fs
umount: /home/qluclar/private/friendfs/ffs: block devices not permitted on fs

=SUPERVISOR REPORT==== 14-Oct-2009::10:17:53 ===
Supervisor: {local,ffs_mountpoint_sup}
Context: child_terminated
Reason: {bad_return_value,not_implemented}
Offender: [{pid,<0.86.0>},
{name,"ffs/"},
{mfa,{ffs_mountpoint,start_link,["ffs/","fs=home"]}},
{restart_type,permanent},
{shutdown,10000},
{child_type,worker}]

fuse: failed to access mountpoint ffs/: Transport endpoint is not connected

=CRASH REPORT==== 14-Oct-2009::10:17:53 ===
crasher:
initial call: fuserlsrv:init/1
pid: <0.88.0>
registered_name: []
exception exit: driver_aborted
in function gen_server:init_it/6
ancestors: [ffs_mountpoint_sup,friendfs_sup,<0.61.0>]
messages: []
links: [<0.68.0>,#Port<0.929>]
dictionary: []
trap_exit: true
status: running
heap_size: 377
stack_size: 24
reductions: 261
neighbours:

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