[XFS] clean up the xfs_offset_to_map interface Currently we pass a struct
page and a relative offset into that page around, and returns the current xfs_iomap_t if the block at the specified offset fits into it, or a NULL pointer otherwise. This patch passed the full 64bit offset into the inode that all callers have anyway, and changes the return value to a simple boolean. Also the function gets a more descriptive name: xfs_iomap_valid. SGI-PV: 947118 SGI-Modid: xfs-linux-melb:xfs-kern:203825a Signed-off-by: NChristoph Hellwig <hch@sgi.com> Signed-off-by: NNathan Scott <nathans@sgi.com>
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