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check ATTR_SIZE contraints in inode_change_ok

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Make sure we check the truncate constraints early on in ->setattr by adding
those checks to inode_change_ok.  Also clean up and document inode_change_ok
to make this obvious.

As a fallout we don't have to call inode_newsize_ok from simple_setsize and
simplify it down to a truncate_setsize which doesn't return an error.  This
simplifies a lot of setattr implementations and means we use truncate_setsize
almost everywhere.  Get rid of fat_setsize now that it's trivial and mark
ext2_setsize static to make the calling convention obvious.

Keep the inode_newsize_ok in vmtruncate for now as all callers need an
audit for its removal anyway.

Note: setattr code in ecryptfs doesn't call inode_change_ok at all and
needs a deeper audit, but that is left for later.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Christoph Hellwig 2010-06-04 11:30:04 +02:00 • committed by Al Viro
commit 2c27c65ed0
21 changed files with 108 additions and 156 deletions
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4
fs/gfs2/aops.c
View file

@ -702,12 +702,12 @@ out:
page_cache_release(page);
/*
* XXX(hch): the call below should probably be replaced with
* XXX(truncate): the call below should probably be replaced with
* a call to the gfs2-specific truncate blocks helper to actually
* release disk blocks..
*/
if (pos + len > ip->i_inode.i_size)
simple_setsize(&ip->i_inode, ip->i_inode.i_size);
truncate_setsize(&ip->i_inode, ip->i_inode.i_size);
out_endtrans:
gfs2_trans_end(sdp);
out_trans_fail:

6
fs/gfs2/ops_inode.c
View file

@ -1072,7 +1072,7 @@ int gfs2_permission(struct inode *inode, int mask)
}
/*
* XXX: should be changed to have proper ordering by opencoding simple_setsize
* XXX(truncate): the truncate_setsize calls should be moved to the end.
*/
static int setattr_size(struct inode *inode, struct iattr *attr)
{
@ -1084,10 +1084,8 @@ static int setattr_size(struct inode *inode, struct iattr *attr)
error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
if (error)
return error;
error = simple_setsize(inode, attr->ia_size);
truncate_setsize(inode, attr->ia_size);
gfs2_trans_end(sdp);
if (error)
return error;
}
error = gfs2_truncatei(ip, attr->ia_size);