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Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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linear currently uses division by the size of the smallest componenet device
to find which device a request goes to. If that smallest device is larger
than 2 terabytes, then the division will not work on some systems.
So we introduce a pre-shift, and take care not to make the hash table too
large, much like the code in raid0.
Also get rid of conf->nr_zones, which is not needed.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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The hashtable that linear uses to find the right device stores
two pointers for every entry.
The second is always one of:
The first plus 1
NULL
When NULL, it is never accessed, so any value can be stored.
Thus it could always be "first plus 1", and so we don't need to store
it as it is trivial to calculate.
This patch halves the size of this table, which results in some simpler
code as well.
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Some size fields were "int" instead of "sector_t".
Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Linear uses one array sized by MD_SB_DISKS inside a structure.
We move it to the end of the structure, declare it as size 0,
and arrange for approprate extra space to be allocated on
structure allocation.
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Holding the rdev instead of the bdev does cause an extra
de-reference, but it is conceptually cleaner and will allow
lots more tidying up.
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* ->dev killed for md/linear.c (same as previous parts)
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- md/linear.c - bring struct block_device * into private data.
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