From: Lachlan McIlroy <lachlan@redback.melbourne.sgi.com>
Date: Mon, 22 Dec 2008 06:56:49 +0000 (+1100)
Subject: [XFS] Fix speculative allocation beyond eof
X-Git-Tag: v2.6.29-rc1~552^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9f6c92b9cc2fd41d6c7b493be5637cc5b5659880;p=pandora-kernel.git

[XFS] Fix speculative allocation beyond eof

Speculative allocation beyond eof doesn't work properly.  It was
broken some time ago after a code cleanup that moved what is now
xfs_iomap_eof_align_last_fsb() and xfs_iomap_eof_want_preallocate()
out of xfs_iomap_write_delay() into separate functions.  The code
used to use the current file size in various checks but got changed
to be max(file_size, i_new_size).  Since i_new_size is the result
of 'offset + count' then in xfs_iomap_eof_want_preallocate() the
check for '(offset + count) <= isize' will always be true.

ie if 'offset + count' is > ip->i_size then isize will be i_new_size
and equal to 'offset + count'.

This change fixes all the places that used to use the current file
size.

Reviewed-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
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