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drbd: Consider the disk-timeout also for meta-data IO operations

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If the backing device is already frozen during attach, we failed
to recognize that. The current disk-timeout code works on top
of the drbd_request objects. During attach we do not allow IO
and therefore never generate a drbd_request object but block
before that in drbd_make_request().

This patch adds the timeout to all drbd_md_sync_page_io().

Before this patch we used to go from D_ATTACHING directly
to D_DISKLESS if IO failed during attach. We can no longer
do this since we have to stay in D_FAILED until all IO
ops issued to the backing device returned.

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 2011-12-14 18:01:21 +01:00
parent 4afc433cf8
commit 7caacb69ac
4 changed files with 40 additions and 34 deletions
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13
drivers/block/drbd/drbd_actlog.c
View File

@ -88,9 +88,16 @@ static bool md_io_allowed(struct drbd_conf *mdev)
return ds >= D_NEGOTIATING || ds == D_ATTACHING;
}
void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done)
void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
unsigned int *done)
{
wait_event(mdev->misc_wait, *done || !md_io_allowed(mdev));
long dt = bdev->dc.disk_timeout * HZ / 10;
if (dt == 0)
dt = MAX_SCHEDULE_TIMEOUT;
dt = wait_event_timeout(mdev->misc_wait, *done || !md_io_allowed(mdev), dt);
if (dt == 0)
dev_err(DEV, "meta-data IO operation timed out\n");
}
static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
@ -130,7 +137,7 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
bio_endio(bio, -EIO);
else
submit_bio(rw, bio);
wait_until_done_or_disk_failure(mdev, &mdev->md_io.done);
wait_until_done_or_disk_failure(mdev, bdev, &mdev->md_io.done);
ok = bio_flagged(bio, BIO_UPTODATE) && mdev->md_io.error == 0;
out:

4
drivers/block/drbd/drbd_bitmap.c
View File

@ -1088,7 +1088,7 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned lazy_writeout_upper_id
* "in_flight reached zero, all done" event.
*/
if (!atomic_dec_and_test(&ctx->in_flight))
wait_until_done_or_disk_failure(mdev, &ctx->done);
wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done);
else
kref_put(&ctx->kref, &bm_aio_ctx_destroy);
@ -1195,7 +1195,7 @@ int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(loc
}
bm_page_io_async(ctx, idx, WRITE_SYNC);
wait_until_done_or_disk_failure(mdev, &ctx->done);
wait_until_done_or_disk_failure(mdev, mdev->ldev, &ctx->done);
if (ctx->error)
drbd_chk_io_error(mdev, 1, true);

3
drivers/block/drbd/drbd_int.h
View File

@ -1541,7 +1541,8 @@ extern void *drbd_md_get_buffer(struct drbd_conf *mdev);
extern void drbd_md_put_buffer(struct drbd_conf *mdev);
extern int drbd_md_sync_page_io(struct drbd_conf *mdev,
struct drbd_backing_dev *bdev, sector_t sector, int rw);
extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done);
extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
unsigned int *done);
extern void drbd_ov_oos_found(struct drbd_conf*, sector_t, int);
extern void drbd_rs_controller_reset(struct drbd_conf *mdev);

54
drivers/block/drbd/drbd_main.c
View File

@ -916,11 +916,6 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state
if (ns.disk == D_FAILED && os.disk == D_DISKLESS)
ns.disk = D_DISKLESS;
/* if we are only D_ATTACHING yet,
* we can (and should) go directly to D_DISKLESS. */
if (ns.disk == D_FAILED && os.disk == D_ATTACHING)
ns.disk = D_DISKLESS;
/* After C_DISCONNECTING only C_STANDALONE may follow */
if (os.conn == C_DISCONNECTING && ns.conn != C_STANDALONE)
ns.conn = os.conn;
@ -1592,35 +1587,38 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* first half of local IO error, failure to attach,
* or administrative detach */
if (os.disk != D_FAILED && ns.disk == D_FAILED) {
enum drbd_io_error_p eh;
int was_io_error;
enum drbd_io_error_p eh = EP_PASS_ON;
int was_io_error = 0;
/* corresponding get_ldev was in __drbd_set_state, to serialize
* our cleanup here with the transition to D_DISKLESS,
* so it is safe to dreference ldev here. */
eh = mdev->ldev->dc.on_io_error;
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
* our cleanup here with the transition to D_DISKLESS.
* But is is still not save to dreference ldev here, since
* we might come from an failed Attach before ldev was set. */
if (mdev->ldev) {
eh = mdev->ldev->dc.on_io_error;
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
/* Immediately allow completion of all application IO, that waits
for completion from the local disk. */
tl_abort_disk_io(mdev);
/* Immediately allow completion of all application IO, that waits
for completion from the local disk. */
tl_abort_disk_io(mdev);
/* current state still has to be D_FAILED,
* there is only one way out: to D_DISKLESS,
* and that may only happen after our put_ldev below. */
if (mdev->state.disk != D_FAILED)
dev_err(DEV,
"ASSERT FAILED: disk is %s during detach\n",
drbd_disk_str(mdev->state.disk));
/* current state still has to be D_FAILED,
* there is only one way out: to D_DISKLESS,
* and that may only happen after our put_ldev below. */
if (mdev->state.disk != D_FAILED)
dev_err(DEV,
"ASSERT FAILED: disk is %s during detach\n",
drbd_disk_str(mdev->state.disk));
if (ns.conn >= C_CONNECTED)
drbd_send_state(mdev, ns);
if (ns.conn >= C_CONNECTED)
drbd_send_state(mdev, ns);
drbd_rs_cancel_all(mdev);
drbd_rs_cancel_all(mdev);
/* In case we want to get something to stable storage still,
* this may be the last chance.
* Following put_ldev may transition to D_DISKLESS. */
drbd_md_sync(mdev);
/* In case we want to get something to stable storage still,
* this may be the last chance.
* Following put_ldev may transition to D_DISKLESS. */
drbd_md_sync(mdev);
}
put_ldev(mdev);
if (was_io_error && eh == EP_CALL_HELPER)