NAME

mfseattr - MooseFS extra attributes management tools

SYNOPSIS

mfsgeteattr [-r] [-n|-h|-H|-k|-m|-g] OBJECT...

mfsseteattr [-r] [-n|-h|-H|-k|-m|-g] -f ATTRNAME [-f ATTRNAME ...] OBJECT...

mfsdeleattr [-r] [-n|-h|-H|-k|-m|-g] -f ATTRNAME [-f ATTRNAME ...] OBJECT...

mfscopyeattr [-r] [-n|-h|-H|-k|-m|-g] SOURCE_OBJECT OBJECT...

DESCRIPTION

These tools are used to get, set or delete some extra attributes (flags).

Attributes:

noowner This flag means, that particular object belongs to current user (uid and gid are equal to uid and gid values of accessing process). Only root (uid=0) sees the real uid and gid.

noattrcache This flag means, that standard file attributes such as uid, gid, mode, length and so on won't be stored in kernel cache. In MooseFS 1.5 this was the only behaviour, and mfsmount always prevented attributes from being stored in kernel cache, but in MooseFS 1.6 attributes can be cached, so in very rare occasions it could be useful to turn it off.

noentrycache This flag is similar to above. It prevents directory entries from being cached in kernel.

nodatacache This flag means, that data cache should be cleared every time a file is opened.

snapshot This flag means that the object was created via a mfsmakesnapshot command

undeletable This flag prevents unlinking (admin only; not inherited)

appendonly Object with this flag can only be appended to, unlinking and other modifications are not allowed (admin only; not inherited)

immutable This flag prevents any change to given object (admin only; not inherited)

GENERAL OPTIONS

Most of mfstools use -n, -h, -H, -k, -m and -g options to select format of printed numbers. -n causes to print exact numbers, -h uses binary prefixes (Ki, Mi, Gi as 2^10, 2^20 etc.) while -H uses SI prefixes (k, M, G as 10^3, 10^6 etc.). -k, -m and -g show plain numbers respectivaly in kibis (binary kilo - 1024), mebis (binary mega - 1024^2) and gibis (binary giga - 1024^3). The same can be achieved by setting MFSHRFORMAT environment variable to: 0 (exact numbers), 1 or h (binary prefixes), 2 or H (SI prefixes), 3 or h+ (exact numbers and binary prefixes), 4 or H+ (exact numbers and SI prefixes). The default is to print just exact numbers.

INHERITANCE

When new object is created in MooseFS, attributes such as storage class, trashtime and extra attributes are inherited from parent directory. So if you set i.e. "noowner" attribute and storage class to "important" in a directory then every new object created in this directory will have storage class set to "important" and "noowner" flag set. A newly created object inherits always the current set of its parent's attributes. Changing a directory attribute does not affect its already created children. To change an attribute for a directory and all of its children use -r option.

REPORTING BUGS

Report bugs to <bugs@moosefs.com>.

COPYRIGHT

This file is part of MooseFS.

MooseFS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2 (only).

MooseFS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with MooseFS; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301, USA or visit http://www.gnu.org/licenses/gpl-2.0.html