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BRT: Fix ZAP entry endianness

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During original block cloning implementation a mistake was made,
making BRT ZAP entries an array of 8 1-byte entries instead of 1
entry of 8 bytes. This makes the pools non-endian-safe.

This commit introduces a new read-compatible pool feature
"com.truenas:block_cloning_endian", fixing the endianness issue
for new pools while maintaining compatibility with existing ones.

The feature is automatically activated when creating the first BRT
ZAP (ensuring we don't activate it on pools that already have BRT
entries in the old format).  When active, BRT entries are stored
as single 8-byte values.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17572
This commit is contained in:
Alexander Motin
2025-07-30 12:42:47 -04:00
committed by GitHub
parent 10a78e2647
commit f70c85086b
6 changed files with 81 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/zfs/brt.c
+56 -14
View File
@@ -478,6 +478,18 @@ brt_vdev_create(spa_t *spa, brt_vdev_t *brtvd, dmu_tx_t *tx)
sizeof (uint64_t), 1, &brtvd->bv_mos_brtvdev, tx));
BRT_DEBUG("Pool directory object created, object=%s", name);
/*
* Activate the endian-fixed feature if this is the first BRT ZAP
* (i.e., BLOCK_CLONING is not yet active) and the feature is enabled.
*/
if (spa_feature_is_enabled(spa, SPA_FEATURE_BLOCK_CLONING_ENDIAN) &&
!spa_feature_is_active(spa, SPA_FEATURE_BLOCK_CLONING)) {
spa_feature_incr(spa, SPA_FEATURE_BLOCK_CLONING_ENDIAN, tx);
} else if (spa_feature_is_active(spa,
SPA_FEATURE_BLOCK_CLONING_ENDIAN)) {
spa_feature_incr(spa, SPA_FEATURE_BLOCK_CLONING_ENDIAN, tx);
}
spa_feature_incr(spa, SPA_FEATURE_BLOCK_CLONING, tx);
}
@@ -658,6 +670,8 @@ brt_vdev_destroy(spa_t *spa, brt_vdev_t *brtvd, dmu_tx_t *tx)
rw_exit(&brtvd->bv_lock);
spa_feature_decr(spa, SPA_FEATURE_BLOCK_CLONING, tx);
if (spa_feature_is_active(spa, SPA_FEATURE_BLOCK_CLONING_ENDIAN))
spa_feature_decr(spa, SPA_FEATURE_BLOCK_CLONING_ENDIAN, tx);
}
static void
@@ -855,16 +869,29 @@ brt_entry_fill(const blkptr_t *bp, brt_entry_t *bre, uint64_t *vdevidp)
*vdevidp = DVA_GET_VDEV(&bp->blk_dva[0]);
}
static boolean_t
brt_has_endian_fixed(spa_t *spa)
{
return (spa_feature_is_active(spa, SPA_FEATURE_BLOCK_CLONING_ENDIAN));
}
static int
brt_entry_lookup(brt_vdev_t *brtvd, brt_entry_t *bre)
brt_entry_lookup(spa_t *spa, brt_vdev_t *brtvd, brt_entry_t *bre)
{
uint64_t off = BRE_OFFSET(bre);
if (brtvd->bv_mos_entries == 0)
return (SET_ERROR(ENOENT));
return (zap_lookup_uint64_by_dnode(brtvd->bv_mos_entries_dnode,
&off, BRT_KEY_WORDS, 1, sizeof (bre->bre_count), &bre->bre_count));
if (brt_has_endian_fixed(spa)) {
return (zap_lookup_uint64_by_dnode(brtvd->bv_mos_entries_dnode,
&off, BRT_KEY_WORDS, sizeof (bre->bre_count), 1,
&bre->bre_count));
} else {
return (zap_lookup_uint64_by_dnode(brtvd->bv_mos_entries_dnode,
&off, BRT_KEY_WORDS, 1, sizeof (bre->bre_count),
&bre->bre_count));
}
}
/*
@@ -1056,7 +1083,7 @@ brt_entry_decref(spa_t *spa, const blkptr_t *bp)
}
rw_exit(&brtvd->bv_lock);
error = brt_entry_lookup(brtvd, &bre_search);
error = brt_entry_lookup(spa, brtvd, &bre_search);
/* bre_search now contains correct bre_count */
if (error == ENOENT) {
BRTSTAT_BUMP(brt_decref_no_entry);
@@ -1118,7 +1145,7 @@ brt_entry_get_refcount(spa_t *spa, const blkptr_t *bp)
bre = avl_find(&brtvd->bv_tree, &bre_search, NULL);
if (bre == NULL) {
rw_exit(&brtvd->bv_lock);
error = brt_entry_lookup(brtvd, &bre_search);
error = brt_entry_lookup(spa, brtvd, &bre_search);
if (error == ENOENT) {
refcnt = 0;
} else {
@@ -1270,10 +1297,18 @@ brt_pending_apply_vdev(spa_t *spa, brt_vdev_t *brtvd, uint64_t txg)
uint64_t off = BRE_OFFSET(bre);
if (brtvd->bv_mos_entries != 0 &&
brt_vdev_lookup(spa, brtvd, off)) {
int error = zap_lookup_uint64_by_dnode(
brtvd->bv_mos_entries_dnode, &off,
BRT_KEY_WORDS, 1, sizeof (bre->bre_count),
&bre->bre_count);
int error;
if (brt_has_endian_fixed(spa)) {
error = zap_lookup_uint64_by_dnode(
brtvd->bv_mos_entries_dnode, &off,
BRT_KEY_WORDS, sizeof (bre->bre_count), 1,
&bre->bre_count);
} else {
error = zap_lookup_uint64_by_dnode(
brtvd->bv_mos_entries_dnode, &off,
BRT_KEY_WORDS, 1, sizeof (bre->bre_count),
&bre->bre_count);
}
if (error == 0) {
BRTSTAT_BUMP(brt_addref_entry_on_disk);
} else {
@@ -1326,7 +1361,7 @@ brt_pending_apply(spa_t *spa, uint64_t txg)
}
static void
brt_sync_entry(dnode_t *dn, brt_entry_t *bre, dmu_tx_t *tx)
brt_sync_entry(spa_t *spa, dnode_t *dn, brt_entry_t *bre, dmu_tx_t *tx)
{
uint64_t off = BRE_OFFSET(bre);
@@ -1337,9 +1372,15 @@ brt_sync_entry(dnode_t *dn, brt_entry_t *bre, dmu_tx_t *tx)
BRT_KEY_WORDS, tx);
VERIFY(error == 0 || error == ENOENT);
} else {
VERIFY0(zap_update_uint64_by_dnode(dn, &off,
BRT_KEY_WORDS, 1, sizeof (bre->bre_count),
&bre->bre_count, tx));
if (brt_has_endian_fixed(spa)) {
VERIFY0(zap_update_uint64_by_dnode(dn, &off,
BRT_KEY_WORDS, sizeof (bre->bre_count), 1,
&bre->bre_count, tx));
} else {
VERIFY0(zap_update_uint64_by_dnode(dn, &off,
BRT_KEY_WORDS, 1, sizeof (bre->bre_count),
&bre->bre_count, tx));
}
}
}
@@ -1368,7 +1409,8 @@ brt_sync_table(spa_t *spa, dmu_tx_t *tx)
void *c = NULL;
while ((bre = avl_destroy_nodes(&brtvd->bv_tree, &c)) != NULL) {
brt_sync_entry(brtvd->bv_mos_entries_dnode, bre, tx);
brt_sync_entry(spa, brtvd->bv_mos_entries_dnode, bre,
tx);
kmem_cache_free(brt_entry_cache, bre);
}