md/raid1: add failfast handling for writes.

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When writing to a fastfail device we use MD_FASTFAIL unless
it is the only device being written to.

For resync/recovery, assume there was a working device to
read from so always use REQ_FASTFAIL_DEV.

If a write for resync/recovery fails, we just fail the
device - there is not much else to do.

If a normal failfast write fails, but the device cannot be
failed (must be only one left), we queue for write error
handling.  This will call narrow_write_error() to retry the
write synchronously and without any FAILFAST flags.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>

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NeilBrown 2016-11-18 16:16:12 +11:00 • committed by Shaohua Li

parent 2e52d449bc

commit 212e7eb7a3

1 changed files with 25 additions and 1 deletions

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drivers/md/raid1.c

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