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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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5
mm/shmem.c
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@ -805,11 +805,10 @@ static int shmem_notify_change(struct dentry *dentry, struct iattr *attr)
}
}
error = simple_setsize(inode, newsize);
/* XXX(truncate): truncate_setsize should be called last */
truncate_setsize(inode, newsize);
if (page)
page_cache_release(page);
if (error)
return error;
shmem_truncate_range(inode, newsize, (loff_t)-1);
}