dm: allow offline devices
Allow check_device_area to succeed if a device has an i_size of zero. This addresses an issue seen on DASD devices setting up a multipath table for paths in online and offline state. Signed-off-by: Mike Anderson <andmike@us.ibm.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -425,13 +425,15 @@ static void close_dev(struct dm_dev *d, struct mapped_device *md)
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}
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/*
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* If possible (ie. blk_size[major] is set), this checks an area
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* of a destination device is valid.
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* If possible, this checks an area of a destination device is valid.
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*/
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static int check_device_area(struct dm_dev *dd, sector_t start, sector_t len)
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{
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sector_t dev_size;
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dev_size = dd->bdev->bd_inode->i_size >> SECTOR_SHIFT;
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sector_t dev_size = dd->bdev->bd_inode->i_size >> SECTOR_SHIFT;
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if (!dev_size)
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return 1;
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return ((start < dev_size) && (len <= (dev_size - start)));
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}
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