diff options
| author | Pavel Zakharov <[email protected]> | 2016-09-14 11:01:40 -0400 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2018-05-14 14:32:49 -0400 |
| commit | 38a19edd34f6a3fc0c8d0f6b9750fc2df2856c9f (patch) | |
| tree | 92b240d1deee9efddbc699ca0327da51ca86ce56 /module/zfs/vdev_label.c | |
| parent | db7d07e14ba4b964f64058e2c3d121d32f8d53c4 (diff) | |
OpenZFS 9189 - Add debug to vdev_label_read_config when txg check fails
These changes were added to help debug issue #9187.
Essentially, in the original bug, vdev_validate() seems to fails in
vdev_label_read_config() and prints "failed reading config". This could
happen because either:
1. The labels are actually corrupt and zio_wait() fails for all of them
2. The labels were discarded because they didn't pass the txg check.
Beyond 9187, having debug info when case 2 happens could be useful in
other scenarios, such as zpool import.
Authored by: Pavel Zakharov <[email protected]>
Reviewed by: George Wilson <[email protected]>
Reviewed by: Prashanth Sreenivasa <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Approved by: Matt Ahrens <[email protected]>
Ported-by: Brian Behlendorf <[email protected]>
OpenZFS-issue: https://illumos.org/issues/9189
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/f6af1b7
Closes #7533
Diffstat (limited to 'module/zfs/vdev_label.c')
| -rw-r--r-- | module/zfs/vdev_label.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/module/zfs/vdev_label.c b/module/zfs/vdev_label.c index 85d133a5a..e5ba7cdc2 100644 --- a/module/zfs/vdev_label.c +++ b/module/zfs/vdev_label.c @@ -673,6 +673,7 @@ vdev_label_read_config(vdev_t *vd, uint64_t txg) abd_t *vp_abd; zio_t *zio; uint64_t best_txg = 0; + uint64_t label_txg = 0; int error = 0; int flags = ZIO_FLAG_CONFIG_WRITER | ZIO_FLAG_CANFAIL | ZIO_FLAG_SPECULATIVE; @@ -698,8 +699,6 @@ retry: if (zio_wait(zio) == 0 && nvlist_unpack(vp->vp_nvlist, sizeof (vp->vp_nvlist), &label, 0) == 0) { - uint64_t label_txg = 0; - /* * Auxiliary vdevs won't have txg values in their * labels and newly added vdevs may not have been @@ -730,6 +729,15 @@ retry: goto retry; } + /* + * We found a valid label but it didn't pass txg restrictions. + */ + if (config == NULL && label_txg != 0) { + vdev_dbgmsg(vd, "label discarded as txg is too large " + "(%llu > %llu)", (u_longlong_t)label_txg, + (u_longlong_t)txg); + } + abd_free(vp_abd); return (config); |