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iomap: pass writeback errors to the mapping
[ Upstream commit b69eea8 ] Modern-day mapping_set_error has the ability to squash the usual negative error code into something appropriate for long-term storage in a struct address_space -- ENOSPC becomes AS_ENOSPC, and everything else becomes EIO. iomap squashes /everything/ to EIO, just as XFS did before that, but this doesn't make sense. Fix this by making it so that we can pass ENOSPC to userspace when writeback fails due to space problems. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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