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drbd: Documenting drbd_should_do_remote() and drbd_should_send_oos()

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Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2010-12-20 15:29:28 +01:00
parent 2265b473ae
commit c88d65e223
1 changed files with 8 additions and 4 deletions
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12
drivers/block/drbd/drbd_req.c
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@ -762,7 +762,7 @@ static int drbd_may_do_local_read(struct drbd_conf *mdev, sector_t sector, int s
return 0 == drbd_bm_count_bits(mdev, sbnr, ebnr); return 0 == drbd_bm_count_bits(mdev, sbnr, ebnr);
} }
static int drbd_should_do_remote(struct drbd_conf *mdev) static bool drbd_should_do_remote(struct drbd_conf *mdev)
{ {
union drbd_state s = mdev->state; union drbd_state s = mdev->state;
@ -770,13 +770,17 @@ static int drbd_should_do_remote(struct drbd_conf *mdev)
(s.pdsk >= D_INCONSISTENT && (s.pdsk >= D_INCONSISTENT &&
s.conn >= C_WF_BITMAP_T && s.conn >= C_WF_BITMAP_T &&
s.conn < C_AHEAD); s.conn < C_AHEAD);
/* Before proto 96 that was >= CONNECTED instead of >= C_WF_BITMAP_T.
That is equivalent since before 96 IO was frozen in the C_WF_BITMAP*
states. */
} }
static int drbd_should_send_oos(struct drbd_conf *mdev) static bool drbd_should_send_oos(struct drbd_conf *mdev)
{ {
union drbd_state s = mdev->state; union drbd_state s = mdev->state;
return s.pdsk >= D_INCONSISTENT && return s.conn == C_AHEAD || s.conn == C_WF_BITMAP_S;
(s.conn == C_AHEAD || s.conn == C_WF_BITMAP_S); /* pdsk = D_INCONSISTENT as a consequence. Protocol 96 check not necessary
since we enter state C_AHEAD only if proto >= 96 */
} }
static int drbd_make_request_common(struct drbd_conf *mdev, struct bio *bio, unsigned long start_time) static int drbd_make_request_common(struct drbd_conf *mdev, struct bio *bio, unsigned long start_time)