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loader: update zfsimpl.c from illumos review suggestions

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Add extra comments and update error handling.

MFH:		1 week
This commit is contained in:
Toomas Soome 2020-01-06 19:35:22 +00:00
parent d679c71970
commit 653c3383c7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=356424
1 changed files with 23 additions and 15 deletions
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38
stand/libsa/zfs/zfsimpl.c
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@ -1097,7 +1097,8 @@ vdev_create(uint64_t guid, vdev_read_t *_read)
vdev->v_read = _read;
/*
* root vdev has no read function.
* root vdev has no read function, we use this fact to
* skip setting up data we do not need for root vdev.
* We only point root vdev from spa.
*/
if (_read != NULL) {
@ -1142,7 +1143,7 @@ vdev_set_initial_state(vdev_t *vdev, const unsigned char *nvlist)
else if (isnt_present != 0)
vdev->v_state = VDEV_STATE_CANT_OPEN;
vdev->v_islog = is_log == 1;
vdev->v_islog = is_log != 0;
}
static int
@ -1234,9 +1235,8 @@ vdev_init(uint64_t guid, const unsigned char *nvlist, vdev_t **vdevp)
if (strcmp(type, "raidz") == 0) {
if (vdev->v_nparity < 1 ||
vdev->v_nparity > 3) {
printf("ZFS: can only boot from disk, "
"mirror, raidz1, raidz2 and raidz3 "
"vdevs\n");
printf("ZFS: invalid raidz parity: %d\n",
vdev->v_nparity);
return (EIO);
}
(void) asprintf(&name, "%s%d-%" PRIu64, type,
@ -1310,16 +1310,17 @@ vdev_insert(vdev_t *top_vdev, vdev_t *vdev)
if (previous == NULL) {
STAILQ_INSERT_HEAD(&top_vdev->v_children, vdev, v_childlink);
count = vdev_child_count(top_vdev);
if (top_vdev->v_nchildren < count)
top_vdev->v_nchildren = count;
} else if (previous->v_id == vdev->v_id) {
/*
* This vdev was configured from label config,
* do not insert duplicate.
*/
return;
} else {
STAILQ_INSERT_AFTER(&top_vdev->v_children, previous, vdev,
v_childlink);
}
if (previous->v_id == vdev->v_id)
return;
STAILQ_INSERT_AFTER(&top_vdev->v_children, previous, vdev, v_childlink);
count = vdev_child_count(top_vdev);
if (top_vdev->v_nchildren < count)
top_vdev->v_nchildren = count;
@ -1365,6 +1366,10 @@ vdev_from_nvlist(spa_t *spa, uint64_t top_guid, const unsigned char *nvlist)
kids = nvlist_next(kids);
}
} else {
/*
* When there are no children, nvlist_find() does return
* error, reset it because leaf devices have no children.
*/
rc = 0;
}
@ -1491,7 +1496,7 @@ vdev_init_from_nvlist(spa_t *spa, const unsigned char *nvlist)
/* Wrong guid?! */
if (spa->spa_guid != pool_guid)
return (EIO);
return (EINVAL);
spa->spa_root_vdev->v_nchildren = vdev_children;
@ -1502,7 +1507,7 @@ vdev_init_from_nvlist(spa_t *spa, const unsigned char *nvlist)
* MOS config has at least one child for root vdev.
*/
if (rc != 0)
return (EIO);
return (rc);
for (int i = 0; i < nkids; i++) {
uint64_t guid;
@ -3266,7 +3271,10 @@ zfs_spa_init(spa_t *spa)
if (rc != 0)
return (rc);
/* Update vdevs from MOS config. */
/*
* Update vdevs from MOS config. Note, we do skip encoding bytes
* here. See also vdev_label_read_config().
*/
rc = vdev_init_from_nvlist(spa, nvlist + 4);
free(nvlist);
return (rc);