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mirror_zfs/module/zfs
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Brian Behlendorf a65bb7c518 mmp: claim sequence id before final import 
As part of SPA_LOAD_IMPORT add an additional activity check to
detect simultaneous imports from different hosts.  This check is
only required when the timing is such that there's no activity
for the the read-only tryimport check to detect.  This extra
safety chceck operates as follows:

1. Repeats the following MMP check 10 times:
  a. Write out an MMP uberblock with the best txg and a random
     sequence id to all primary pool vdevs.
  b. Verify a minimum number of good writes such that even if
     the pool appears degraded on the remote host it will see
     at least one of the updated MMP uberblocks.
  c. Wait for the MMP interval this leaves a window for other
     racing hosts to make similar modifications which can be
     detected.
  d. Call vdev_uberblock_load() to determine the best uberblock
     to use, this should be the MMP uberblock just written.
  e. Verify the txg and random sequeunce number match the MMP
     uberblock written in 1a.

2. Restore the original MMP uberblocks.  This allows the check
   to be performed again if the pool fails to import for an
   unrelated reason.

This change also includes some refactoring and minor improvements.

- Never try loading earlier txgs during import when the import
  fails with EREMOTEIO or EINTER.  These errors don't indicate
  the txg is damaged but instead that its either in use on a
  remote host or the import was interactively cancelled.  No
  rewind is also performed for EBADD which can result from a
  stale trusted config when doing a verbatim import.

- Refactor the code for consistent logging of the multihost
  activity check using spa_load_note() and console messages
  indicating when the activity check was trigger and the result.

- Added MMP_*_MASK and MMP_SEQ_CLEAR() macros to allow easier
  modification of the sequence number in an uberblock.

- Added ZFS_LOAD_INFO_DEBUG environment variable which can be
  set to log to dump to stdout the spa_load_info nvlist returned
  during import.  This is used by the updated mmp test cases
  to determine if an activity check was run and its result.

- Standardize the mmp messages similarly to make it easier to
  find all the relevent mmp lines in the debug log.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Akash B <akash-b@hpe.com>
2026-02-11 13:33:19 -08:00
..
abd.c Preserve LIFO ordering of kmap ops in abd_raidz_gen_iterate() 2025-12-19 19:55:14 -08:00
aggsum.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
arc.c enforce arc_dnode_limit 2025-08-07 12:11:34 -04:00
blake3_zfs.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
blkptr.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
bplist.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
bpobj.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
bptree.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
bqueue.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
brt.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
btree.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dataset_kstats.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dbuf_stats.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dbuf.c Skip dbuf_evict_one() from dbuf_evict_notify() for reclaim thread 2025-08-07 12:15:14 -04:00
ddt_log.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
ddt_stats.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
ddt_zap.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
ddt.c FDT dedup log sync -- remove incremental 2025-08-05 12:15:21 -04:00
dmu_diff.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dmu_direct.c Export correct symbols for Lustre Direct I/O 2025-05-28 16:00:28 -07:00
dmu_object.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dmu_objset.c dmu_objset_hold_flags() should call dsl_dataset_rele_flags() on error 2025-05-28 16:00:28 -07:00
dmu_recv.c Make ganging redundancy respect redundant_metadata property (#17073) 2025-08-05 13:10:40 -04:00
dmu_redact.c dmu_tx: rename dmu_tx_assign() flags from TXG_* to DMU_TX_* (#17143) 2025-04-16 09:59:45 -07:00
dmu_send.c Fix 2 bugs in non-raw send with encryption 2025-05-28 16:00:28 -07:00
dmu_traverse.c dmu_traverse: remove 'ignore_hole_birth' tunable alias 2025-06-17 10:50:27 -07:00
dmu_tx.c Improve block cloning transactions accounting 2025-06-17 10:50:26 -07:00
dmu_zfetch.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dmu.c Fix two infinite loops if dmu_prefetch_max set to zero 2025-10-22 10:36:30 -07:00
dnode_sync.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dnode.c dnode_next_offset: backtrack if lower level does not match 2025-10-21 11:30:30 -07:00
dsl_bookmark.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dsl_crypt.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dsl_dataset.c Expose dataset encryption status via fast stat path 2025-06-17 10:49:40 -07:00
dsl_deadlist.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dsl_deleg.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dsl_destroy.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dsl_dir.c cred: properly pass and test creds on other threads (#17273) 2025-05-28 16:00:28 -07:00
dsl_pool.c During pool export flush the ARC asynchronously 2025-06-17 10:50:26 -07:00
dsl_prop.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
dsl_scan.c scrub: generate scrub_finish event 2025-08-05 12:21:46 -04:00
dsl_synctask.c txg: generalise txg_wait_synced_sig() to txg_wait_synced_flags() (#17284) 2025-05-28 16:00:28 -07:00
dsl_userhold.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
edonr_zfs.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
fm.c tunables: ensure tunable and variable have same define gate 2025-06-17 10:50:26 -07:00
gzip.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
hkdf.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
lz4_zfs.c SPDX: license tags: BSD-2-Clause 2025-04-16 09:59:44 -07:00
lz4.c SPDX: license tags: BSD-2-Clause 2025-04-16 09:59:44 -07:00
lzjb.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
metaslab.c range_tree: Provide more debug details upon unexpected add/remove 2025-08-05 12:34:54 -04:00
mmp.c mmp: claim sequence id before final import 2026-02-11 13:33:19 -08:00
multilist.c Allow vmem_alloc backed multilists 2025-08-12 17:24:30 -07:00
objlist.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
pathname.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
range_tree.c range_tree: Provide more debug details upon unexpected add/remove 2025-08-05 12:34:54 -04:00
refcount.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
rrwlock.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
sa.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
sha2_zfs.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
skein_zfs.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
spa_checkpoint.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
spa_config.c Add interface to interface spa_get_worst_case_min_alloc() function 2025-10-21 11:02:42 -07:00
spa_errlog.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
spa_history.c dmu_tx: rename dmu_tx_assign() flags from TXG_* to DMU_TX_* (#17143) 2025-04-16 09:59:45 -07:00
spa_log_spacemap.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
spa_misc.c mmp: add spa_load_name() for tryimport 2026-02-11 13:33:19 -08:00
spa_stats.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
spa.c mmp: claim sequence id before final import 2026-02-11 13:33:19 -08:00
space_map.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
space_reftree.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
THIRDPARTYLICENSE.cityhash OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
THIRDPARTYLICENSE.cityhash.descrip OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
txg.c txg: generalise txg_wait_synced_sig() to txg_wait_synced_flags() (#17284) 2025-05-28 16:00:28 -07:00
uberblock.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
unique.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_draid_rand.c SPDX: license tags: LicenseRef-OpenZFS-ThirdParty-PublicDomain 2025-04-16 09:59:45 -07:00
vdev_draid.c Fix other nonrot bugs 2025-08-05 12:25:26 -04:00
vdev_file.c Enable zhack to work properly with 4k sector size disks 2026-02-11 13:33:12 -08:00
vdev_indirect_births.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_indirect_mapping.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_indirect.c dmu_tx: rename dmu_tx_assign() flags from TXG_* to DMU_TX_* (#17143) 2025-04-16 09:59:45 -07:00
vdev_initialize.c range_tree: Provide more debug details upon unexpected add/remove 2025-08-05 12:34:54 -04:00
vdev_label.c mmp: claim sequence id before final import 2026-02-11 13:33:19 -08:00
vdev_mirror.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_missing.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_queue.c FDT dedup log sync -- remove incremental 2025-08-05 12:15:21 -04:00
vdev_raidz_math_aarch64_neon_common.h SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_aarch64_neon.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_aarch64_neonx2.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_avx2.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_avx512bw.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_avx512f.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_impl.h SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_powerpc_altivec_common.h SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_powerpc_altivec.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_scalar.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_sse2.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math_ssse3.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_raidz_math.c tunables: don't assert initialisation in impl getters 2025-06-17 10:50:26 -07:00
vdev_raidz.c range_tree: Provide more debug details upon unexpected add/remove 2025-08-05 12:34:54 -04:00
vdev_rebuild.c range_tree: Provide more debug details upon unexpected add/remove 2025-08-05 12:34:54 -04:00
vdev_removal.c range_tree: Provide more debug details upon unexpected add/remove 2025-08-05 12:34:54 -04:00
vdev_root.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
vdev_trim.c range_tree: Provide more debug details upon unexpected add/remove 2025-08-05 12:34:54 -04:00
vdev.c Add interface to interface spa_get_worst_case_min_alloc() function 2025-10-21 11:02:42 -07:00
zap_leaf.c ZAP: Reduce leaf array and free chunks fragmentation 2025-05-28 16:00:28 -07:00
zap_micro.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zap.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zcp_get.c zcp: get_prop: fix encryptionroot and encryption 2025-06-17 10:49:40 -07:00
zcp_global.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zcp_iter.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zcp_set.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zcp_synctask.c cred: properly pass and test creds on other threads (#17273) 2025-05-28 16:00:28 -07:00
zcp.c txg: generalise txg_wait_synced_sig() to txg_wait_synced_flags() (#17284) 2025-05-28 16:00:28 -07:00
zfeature.c Synchronize the update of feature refcount 2025-11-05 08:53:06 -08:00
zfs_byteswap.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zfs_chksum.c Faster checksum benchmark on system boot 2025-08-05 12:34:13 -04:00
zfs_fm.c zed: Ensure spare activation after kernel-initiated device removal 2025-04-16 09:59:45 -07:00
zfs_fuid.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zfs_impl.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zfs_ioctl.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zfs_log.c zfs_log_write: only put the callback on the last itx 2025-06-17 10:50:26 -07:00
zfs_onexit.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zfs_quota.c dmu_tx: rename dmu_tx_assign() flags from TXG_* to DMU_TX_* (#17143) 2025-04-16 09:59:45 -07:00
zfs_ratelimit.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zfs_replay.c dmu_tx: rename dmu_tx_assign() flags from TXG_* to DMU_TX_* (#17143) 2025-04-16 09:59:45 -07:00
zfs_rlock.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zfs_sa.c dmu_tx: rename dmu_tx_assign() flags from TXG_* to DMU_TX_* (#17143) 2025-04-16 09:59:45 -07:00
zfs_vnops.c Linux: sync: remove async/sync accounting 2025-08-12 17:23:39 -07:00
zfs_znode.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zil.c ZIL: Force writing of open LWB on suspend 2025-08-05 12:28:41 -04:00
zio_checksum.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zio_compress.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zio_inject.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zio.c Make ganging redundancy respect redundant_metadata property (#17073) 2025-08-05 13:10:40 -04:00
zle.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zrlock.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zthr.c SPDX: license tags: CDDL-1.0 2025-04-16 09:59:44 -07:00
zvol.c Improve block cloning transactions accounting 2025-06-17 10:50:26 -07:00