Hi, Can anyone tell me the ext3/ext2/vfs FS specifications: max number of files: ? max number files a dir can have: ? max number sub-dirs in a dir: ? max file size: ? max filesystem size: ? Dongsheng Song
On Feb 26, 2002 13:04 +0800, Dongsheng Song wrote:> Can anyone tell me the ext3/ext2/vfs FS specifications: > > max number of files: ? > max number files a dir can have: ? > max number sub-dirs in a dir: ? > max file size: ? > max filesystem size: ?Please see linux/Documentation/filesystems/ext2.txt Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/
Hi, On Tue, Feb 26, 2002 at 01:04:12PM +0800, Dongsheng Song wrote:> Can anyone tell me the ext3/ext2/vfs FS specifications:> max number of files: ?Configurable when the filesystem is created; up to 2^32.> max number files a dir can have: ?Unlimited, although performance drops in very large directories.> max number sub-dirs in a dir: ?32765.> max file size: ?2TB.> max filesystem size: ?2TB (limited by the block device layer --- to be fixed in 2.5.) --Stephen
On Tue, 26 Feb 2002 10:04:29 +0000, "Stephen C. Tweedie" <sct@redhat.com> wrote:>On Tue, Feb 26, 2002 at 01:04:12PM +0800, Dongsheng Song wrote: >> Can anyone tell me the ext3/ext2/vfs FS specifications: >> max number of files: ? >Configurable when the filesystem is created; up to 2^32.Is there a site where one can go and get latest info about ext3 specs? Right now one has to search through mailing list archives and: - hope to find something - hope what he finds is the correct answer for current ext3 version/kernel. Or maybe just a site linking to pages that ext3 authors think relevant/interesting: http://www.zip.com.au/~akpm/linux/ext3/ext3-usage.html http://www.stahl.bau.tu-bs.de/~hildeb/postfix/ext3.shtml ... Thanks. -- giulioo@pobox.com
Hi, On Tue, Feb 26, 2002 at 11:24:42AM +0100, Giulio Orsero wrote:> On Tue, 26 Feb 2002 10:04:29 +0000, "Stephen C. Tweedie" <sct@redhat.com> > wrote: > > >On Tue, Feb 26, 2002 at 01:04:12PM +0800, Dongsheng Song wrote: > >> Can anyone tell me the ext3/ext2/vfs FS specifications: > >> max number of files: ? > >Configurable when the filesystem is created; up to 2^32. > > Is there a site where one can go and get latest info about ext3 specs?How about the source code? linux/Documentation/filesystems/ext2.txt also applies to ext3. Cheers, Stephen
Hi Stephen, I would like to know why ext3 uses both page caching and buffer caching, and if unification is planed in the furture ? It seems that page caching is now generic for file system in 2.4 , so ext3 use it. But buffers seems also be used for data and metadata accesses as i see that __block_commit_write() is called by ext3_commit_write() / generic_commit_write() whatever the journaled / ordered / ... mode. What are the impact/advantages on performances if these two levels of cache are used together ? I read that an unification of this is ongoing since 2.? is it true ? Regards, Eric
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