NeilBrown 2a2275d630 [PATCH] md: fix potential memalloc deadlock in md ...

If a GFP_KERNEL allocation is attempted in md while the mddev_lock is held,
it is possible for a deadlock to eventuate.

This happens if the array was marked 'clean', and the memalloc triggers a
write-out to the md device.

For the writeout to succeed, the array must be marked 'dirty', and that
requires getting the mddev_lock.

So, before attempting a GFP_KERNEL allocation while holding the lock, make
sure the array is marked 'dirty' (unless it is currently read-only).

Signed-off-by: Neil Brown <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2007-01-26 13:51:00 -08:00

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bitmap.h

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Kbuild

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linear.h

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md_k.h

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md_p.h

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md_u.h

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md.h

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multipath.h

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raid0.h

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raid1.h

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raid5.h

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raid10.h

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xor.h

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