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Sync AUX label on import
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Sync AUX label on import as disk paths might have changed

Signed-off-by: Ameer Hamza <[email protected]>
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@ixhamza
ixhamza committed Feb 21, 2024
1 parent af4da5c commit 8b0e4a2
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Showing 3 changed files with 91 additions and 44 deletions.
1 change: 1 addition & 0 deletions include/sys/spa_impl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -140,6 +140,7 @@ struct spa_aux_vdev {
vdev_t **sav_vdevs; /* devices */
int sav_count; /* number devices */
boolean_t sav_sync; /* sync the device list */
boolean_t sav_label_sync; /* sync the labels */
nvlist_t **sav_pending; /* pending device additions */
uint_t sav_npending; /* # pending devices */
};
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2 changes: 2 additions & 0 deletions module/zfs/spa.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6686,6 +6686,7 @@ spa_import(char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags)
spa_load_spares(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
spa->spa_spares.sav_sync = B_TRUE;
spa->spa_spares.sav_label_sync = B_TRUE;
}
if (nvlist_lookup_nvlist_array(nvroot, ZPOOL_CONFIG_L2CACHE,
&l2cache, &nl2cache) == 0) {
Expand All @@ -6701,6 +6702,7 @@ spa_import(char *pool, nvlist_t *config, nvlist_t *props, uint64_t flags)
spa_load_l2cache(spa);
spa_config_exit(spa, SCL_ALL, FTAG);
spa->spa_l2cache.sav_sync = B_TRUE;
spa->spa_l2cache.sav_label_sync = B_TRUE;
}

/*
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132 changes: 88 additions & 44 deletions module/zfs/vdev_label.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1007,6 +1007,56 @@ vdev_inuse(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason,
return (state == POOL_STATE_ACTIVE);
}

static nvlist_t *
vdev_aux_label_generate(vdev_t *vd, boolean_t reason_spare)
{
nvlist_t *label;

/*
* For inactive hot spares and level 2 ARC devices, we generate
* a special label that identifies as a mutually shared hot
* spare or l2cache device. We write the label in case of
* addition or removal of hot spare or l2cache vdev (in which
* case we want to revert the labels).
*/
VERIFY(nvlist_alloc(&label, NV_UNIQUE_NAME, KM_SLEEP) == 0);
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_VERSION,
spa_version(vd->vdev_spa)) == 0);
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_POOL_STATE, reason_spare ?
POOL_STATE_SPARE : POOL_STATE_L2CACHE) == 0);
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_GUID,
vd->vdev_guid) == 0);

/*
* This is merely to facilitate reporting the ashift of the
* cache device through zdb. The actual retrieval of the
* ashift (in vdev_alloc()) uses the nvlist
* spa->spa_l2cache->sav_config (populated in
* spa_ld_open_aux_vdevs()).
*/
if (!reason_spare) {
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_ASHIFT,
vd->vdev_ashift) == 0);
}

/*
* Add path information to help find it during pool import
*/
if (vd->vdev_path != NULL) {
VERIFY(nvlist_add_string(label, ZPOOL_CONFIG_PATH,
vd->vdev_path) == 0);
}
if (vd->vdev_devid != NULL) {
VERIFY(nvlist_add_string(label, ZPOOL_CONFIG_DEVID,
vd->vdev_devid) == 0);
}
if (vd->vdev_physpath != NULL) {
VERIFY(nvlist_add_string(label, ZPOOL_CONFIG_PHYS_PATH,
vd->vdev_physpath) == 0);
}
return (label);
}

/*
* Initialize a vdev label. We check to make sure each leaf device is not in
* use, and writable. We put down an initial label which we will later
Expand Down Expand Up @@ -1121,49 +1171,7 @@ vdev_label_init(vdev_t *vd, uint64_t crtxg, vdev_labeltype_t reason)
* be written again with a meaningful txg by spa_sync().
*/
if (reason_spare || reason_l2cache) {
/*
* For inactive hot spares and level 2 ARC devices, we generate
* a special label that identifies as a mutually shared hot
* spare or l2cache device. We write the label in case of
* addition or removal of hot spare or l2cache vdev (in which
* case we want to revert the labels).
*/
VERIFY(nvlist_alloc(&label, NV_UNIQUE_NAME, KM_SLEEP) == 0);

VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_VERSION,
spa_version(spa)) == 0);
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_POOL_STATE,
reason_spare ? POOL_STATE_SPARE : POOL_STATE_L2CACHE) == 0);
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_GUID,
vd->vdev_guid) == 0);

/*
* This is merely to facilitate reporting the ashift of the
* cache device through zdb. The actual retrieval of the
* ashift (in vdev_alloc()) uses the nvlist
* spa->spa_l2cache->sav_config (populated in
* spa_ld_open_aux_vdevs()).
*/
if (reason_l2cache) {
VERIFY(nvlist_add_uint64(label, ZPOOL_CONFIG_ASHIFT,
vd->vdev_ashift) == 0);
}

/*
* Add path information to help find it during pool import
*/
if (vd->vdev_path != NULL) {
VERIFY(nvlist_add_string(label, ZPOOL_CONFIG_PATH,
vd->vdev_path) == 0);
}
if (vd->vdev_devid != NULL) {
VERIFY(nvlist_add_string(label, ZPOOL_CONFIG_DEVID,
vd->vdev_devid) == 0);
}
if (vd->vdev_physpath != NULL) {
VERIFY(nvlist_add_string(label, ZPOOL_CONFIG_PHYS_PATH,
vd->vdev_physpath) == 0);
}
label = vdev_aux_label_generate(vd, reason_spare);

/*
* When spare or l2cache (aux) vdev is added during pool
Expand Down Expand Up @@ -1900,6 +1908,8 @@ vdev_label_sync(zio_t *zio, uint64_t *good_writes,
abd_t *vp_abd;
char *buf;
size_t buflen;
vdev_t *pvd = vd->vdev_parent;
boolean_t spare_in_use = B_FALSE;

for (int c = 0; c < vd->vdev_children; c++) {
vdev_label_sync(zio, good_writes,
Expand All @@ -1920,10 +1930,17 @@ vdev_label_sync(zio_t *zio, uint64_t *good_writes,
if (vd->vdev_ops == &vdev_draid_spare_ops)
return;

if (pvd && pvd->vdev_ops == &vdev_spare_ops)
spare_in_use = B_TRUE;

/*
* Generate a label describing the top-level config to which we belong.
*/
label = spa_config_generate(vd->vdev_spa, vd, txg, B_FALSE);
if ((vd->vdev_isspare && !spare_in_use) || vd->vdev_isl2cache) {
label = vdev_aux_label_generate(vd, vd->vdev_isspare);
} else {
label = spa_config_generate(vd->vdev_spa, vd, txg, B_FALSE);
}

vp_abd = abd_alloc_linear(sizeof (vdev_phys_t), B_TRUE);
abd_zero(vp_abd, sizeof (vdev_phys_t));
Expand Down Expand Up @@ -1973,6 +1990,24 @@ vdev_label_sync_list(spa_t *spa, int l, uint64_t txg, int flags)
zio_nowait(vio);
}

/*
* AUX path may have changed during import
*/
spa_aux_vdev_t *sav[2] = {&spa->spa_spares, &spa->spa_l2cache};
for (int i = 0; i < 2; i++) {
for (int v = 0; v < sav[i]->sav_count; v++) {
uint64_t *good_writes;
if (!sav[i]->sav_label_sync)
continue;
good_writes = kmem_zalloc(sizeof (uint64_t), KM_SLEEP);
zio_t *vio = zio_null(zio, spa, NULL,
vdev_label_sync_ignore_done, good_writes, flags);
vdev_label_sync(vio, good_writes, sav[i]->sav_vdevs[v],
l, txg, flags);
zio_nowait(vio);
}
}

error = zio_wait(zio);

/*
Expand All @@ -1983,6 +2018,15 @@ vdev_label_sync_list(spa_t *spa, int l, uint64_t txg, int flags)
for (vd = list_head(dl); vd != NULL; vd = list_next(dl, vd))
zio_flush(zio, vd);

for (int i = 0; i < 2; i++) {
if (!sav[i]->sav_label_sync)
continue;
for (int v = 0; v < sav[i]->sav_count; v++)
zio_flush(zio, sav[i]->sav_vdevs[v]);
if (l == 1)
sav[i]->sav_label_sync = B_FALSE;
}

(void) zio_wait(zio);

return (error);
Expand Down

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