aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/drbd/drbd_int.h
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/drbd/drbd_int.h')
-rw-r--r--drivers/block/drbd/drbd_int.h39
1 files changed, 33 insertions, 6 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index eeab868f056..32a9ab67a5f 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -682,7 +682,8 @@ enum {
once no more io in flight, start bitmap io */
BITMAP_IO_QUEUED, /* Started bitmap IO */
GO_DISKLESS, /* Disk is being detached, on io-error or admin request. */
- WAS_IO_ERROR, /* Local disk failed returned IO error */
+ WAS_IO_ERROR, /* Local disk failed, returned IO error */
+ WAS_READ_ERROR, /* Local disk READ failed (set additionally to the above) */
FORCE_DETACH, /* Force-detach from local disk, aborting any pending local IO */
RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */
RESIZE_PENDING, /* Size change detected locally, waiting for the response from
@@ -1142,6 +1143,9 @@ extern void drbd_queue_bitmap_io(struct drbd_conf *mdev,
extern int drbd_bitmap_io(struct drbd_conf *mdev,
int (*io_fn)(struct drbd_conf *),
char *why, enum bm_flag flags);
+extern int drbd_bitmap_io_from_worker(struct drbd_conf *mdev,
+ int (*io_fn)(struct drbd_conf *),
+ char *why, enum bm_flag flags);
extern int drbd_bmio_set_n_write(struct drbd_conf *mdev);
extern int drbd_bmio_clear_n_write(struct drbd_conf *mdev);
extern void drbd_go_diskless(struct drbd_conf *mdev);
@@ -1661,14 +1665,15 @@ static inline union drbd_state drbd_read_state(struct drbd_conf *mdev)
}
enum drbd_force_detach_flags {
- DRBD_IO_ERROR,
+ DRBD_READ_ERROR,
+ DRBD_WRITE_ERROR,
DRBD_META_IO_ERROR,
DRBD_FORCE_DETACH,
};
#define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__)
static inline void __drbd_chk_io_error_(struct drbd_conf *mdev,
- enum drbd_force_detach_flags forcedetach,
+ enum drbd_force_detach_flags df,
const char *where)
{
enum drbd_io_error_p ep;
@@ -1678,18 +1683,40 @@ static inline void __drbd_chk_io_error_(struct drbd_conf *mdev,
rcu_read_unlock();
switch (ep) {
case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */
- if (forcedetach == DRBD_IO_ERROR) {
+ if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) {
if (__ratelimit(&drbd_ratelimit_state))
dev_err(DEV, "Local IO failed in %s.\n", where);
if (mdev->state.disk > D_INCONSISTENT)
_drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_HARD, NULL);
break;
}
- /* NOTE fall through to detach case if forcedetach set */
+ /* NOTE fall through for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */
case EP_DETACH:
case EP_CALL_HELPER:
+ /* Remember whether we saw a READ or WRITE error.
+ *
+ * Recovery of the affected area for WRITE failure is covered
+ * by the activity log.
+ * READ errors may fall outside that area though. Certain READ
+ * errors can be "healed" by writing good data to the affected
+ * blocks, which triggers block re-allocation in lower layers.
+ *
+ * If we can not write the bitmap after a READ error,
+ * we may need to trigger a full sync (see w_go_diskless()).
+ *
+ * Force-detach is not really an IO error, but rather a
+ * desperate measure to try to deal with a completely
+ * unresponsive lower level IO stack.
+ * Still it should be treated as a WRITE error.
+ *
+ * Meta IO error is always WRITE error:
+ * we read meta data only once during attach,
+ * which will fail in case of errors.
+ */
set_bit(WAS_IO_ERROR, &mdev->flags);
- if (forcedetach == DRBD_FORCE_DETACH)
+ if (df == DRBD_READ_ERROR)
+ set_bit(WAS_READ_ERROR, &mdev->flags);
+ if (df == DRBD_FORCE_DETACH)
set_bit(FORCE_DETACH, &mdev->flags);
if (mdev->state.disk > D_FAILED) {
_drbd_set_state(_NS(mdev, disk, D_FAILED), CS_HARD, NULL);