dm crypt: don't allocate pages for a partial request

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Change crypt_alloc_buffer so that it only ever allocates pages for a
full request.  This is a prerequisite for the commit "dm crypt: offload
writes to thread".

This change simplifies the dm-crypt code at the expense of reduced
throughput in low memory conditions (where allocation for a partial
request is most useful).

Note: the next commit ("dm crypt: avoid deadlock in mempools") is needed
to fix a theoretical deadlock.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

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Mikulas Patocka 2015-02-13 08:23:52 -05:00 • committed by Mike Snitzer

parent f3396c58fd

commit cf2f1abfbd

1 changed files with 30 additions and 109 deletions

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147

drivers/md/dm-crypt.c

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