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When allocating a pbuf for the cluster write, do not sleep waiting
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Description

When allocating a pbuf for the cluster write, do not sleep waiting
for the available pbuf when passed vnode is backing md(4). Other i/o
directed to the same md device might already hold pbufs, and then we
could deadlock since only our progress can free a pbuf needed for
wakeup.

Obtained from: projects/vm6
Reminded and tested by: pho
MFC after: 1 week

Details

Provenance
kibAuthored on
Parents
rS254944: - Initialize freq variable so we will not end up with random value
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head/
sys/
kern/

rS254945

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head/sys/kern/vfs_cluster.c

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