Messages in this thread | | | Date | Sun, 17 Mar 2002 18:53:56 -0500 | From | Mark Mielke <> | Subject | Re: Ext2 zeros inode in directory entry when deleting files. |
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On Sun, Mar 17, 2002 at 03:20:19PM -0600, Oliver Xymoron wrote: > On Sun, 17 Mar 2002, Mark Mielke wrote: > > Out of curiosity... how would you mark the first entry in a directory > > as 'deleted' under your suggestion? > As it happens, the first entry tends to be '.'.
If this was a guarantee, I would assume that the initial two entries could be optimized as two inodes.
> > Also, I'm not certain, but I suspect that the reclen vs namelen > > difference allows the ext2(/3) format to be extended while minimizing > > breakage to existing code. One day another field might be added to the > > inode and any assumptions regarding the size of a record length would > > limit such extensions. (One such field is currently the 'file type', > > although, the file type does not actually use up any additional bytes) > Doesn't matter, reclen still makes it a linked list, and we'd still skip > over 'dead' entries, regardless of content.
If the extra bytes (reclen - namelen) *were* extra bits of file system information, there would be no safe way of ensuring that the allocation of a new directory entry didn't 'accidentally' overwrite these bytes.
Exactly how big should you assume reclen *really* is, if reclen sometimes means the length of the record, and other times means a next pointer offset?
mark
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