[lkml]   [2011]   [Oct]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH V1 00/17] ext4: Add inline data support.
On Wed, 26 Oct 2011 15:32:24 +0800, Tao Ma said:

> Currently I use all the space between i_extra_isize and inode_size if
> inode_size = 256. For inode_size > 256, half of that space is used so as
> to leave some space for other xattrs.

I didn't check the code too closely - does this code DTRT if the user tries to
then attach a moby-sized xattr (or set of xattrs - if it's got a security.selinux
tag on it, and a security.capabilities xattr, and a user xattr or two, things are
going to be getting full).

> This is only a V1 and there are still something to do(e.g. I am thinking
> of using unused extent space), but I'd like to send it out earlier so
> that it can be reviewed ASAP.

If this works out, would it make sense to investigate doing this for all
tails in a V2? So if your file was 4099 bytes long, you could save allocating
a second block. Assuming random distribution of tail sizes, this wil save
an average of (space avail for tail)/(blocksize) per file.
[unhandled content-type:application/pgp-signature]
 \ /
  Last update: 2011-10-27 09:13    [W:0.092 / U:14.328 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site