[XFS] Propagate xfs_trans_reserve() errors.
xfs_trans_reserve() reports errors that should not be ignored. For example, a shutdown filesystem will report errors through xfs_trans_reserve() to prevent further changes from being attempted on a damaged filesystem. Catch and propagate all error conditions from xfs_trans_reserve(). SGI-PV: 980084 SGI-Modid: xfs-linux-melb:xfs-kern:30794a Signed-off-by: NDavid Chinner <dgc@sgi.com> Signed-off-by: NNiv Sardi <xaiki@sgi.com> Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
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