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Full Discussion: Setting default directory file permissions and ownership help
Top Forums UNIX for Dummies Questions & Answers Setting default directory file permissions and ownership help Post 302485268 by cjcox on Tuesday 4th of January 2011 06:18:12 PM
Old 01-04-2011
This is actually harder than it seems. Usually the only way to achieve this is via a front end in front of the filesystem. Once such frontend is something like Samba... and you can achieve something like what you are wanting using Samba. But there are likely other frontends (perhaps FUSE based??) that might help as well.

On the opposite end, some systems (filesystems) support some kind of extended ACL feature... it too, might allow you to do something like what you are looking for.

But in general, you can't do what you are wanting automatically by default on most *ix systems.
 

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LEARN ABOUT OSX

vfs_prealloc

VFS_PREALLOC(8) 														   VFS_PREALLOC(8)

NAME

       vfs_prealloc - preallocate matching files to a predetermined size

SYNOPSIS

       vfs objects = prealloc

DESCRIPTION

       This VFS module is part of the samba(7) suite.

       The  vfs_prealloc  VFS  module preallocates files to a specified size each time a new file is created. This is useful in environments where
       files are of a predetermined size will be written to a disk subsystem where extending file allocations is expensive.

       This module is stackable.

OPTIONS

       prealloc:EXT = BYTES
	  Preallocate all files with the extension EXT to the size specified by BYTES.

	  The following suffixes may be applied to BYTES:

	     o	K - BYTES is a number of kilobytes

	     o	M - BYTES is a number of megabytes

	     o	G - BYTES is a number of gigabytes

EXAMPLES

       A process writes TIFF files to a Samba share, and the is known these files will almost always be around 4 megabytes (4194304 bytes):

	       [frames]
	    path = /data/frames
	    vfs objects = prealloc
	    prealloc:tiff = 4M

CAVEATS

       vfs_prealloc is not supported on all platforms and filesystems. Currently only XFS filesystems on Linux and IRIX are supported.

VERSION

       This man page is correct for version 3.0.25 of the Samba suite.

AUTHOR

       The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the  Samba	Team  as  an  Open
       Source project similar to the way the Linux kernel is developed.

																   VFS_PREALLOC(8)
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