From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hans Reiser Subject: Re: when is it decided that extent pointer is to be created in reiser4 Date: Mon, 21 Feb 2005 10:24:23 -0800 Message-ID: <421A2757.4000408@namesys.com> References: <20050221172615.70993.qmail@web60109.mail.yahoo.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit list-help: list-unsubscribe: list-post: Errors-To: flx@namesys.com In-Reply-To: <20050221172615.70993.qmail@web60109.mail.yahoo.com> List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Pallavi Dalya Cc: reiser-list mailing Pallavi Dalya wrote: >hello, > > as far as i know tree based file systems use >extents for managing free space. does reiser4 use a >bitmap based method or extents to keep track of used >and free blocks. > > bitmap. > another issue is that when i tried storing a >small file an extent pointer was created for the file >which was also the case for a large file. but to my >knowledge extent pointers are created for large files >and in some file systems there is a fixed limit to the >file size after which it is assigned an extent >pointer. > > we store in formatted nodes until the file reaches ~16k in size. >wat is the policy used in reiser4 to decide which >files should be stored using extent pointers and which >should not. > also from what i have observed each file has a >unique key representing it in reiser4. is there any >specific key generation algorithm for file names and >if yes where could i find it. is it possible that >instead of passing single file names to the key >generation algorithms we could pass the entire path to >generate a unique key. > > If you have a limit on the path length, or you make keys variable in length, yes. >________________________________________________________________________ >Yahoo! Messenger - Communicate instantly..."Ping" >your friends today! Download Messenger Now >http://uk.messenger.yahoo.com/download/index.html > > > >