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Brian Behlendorf 25f06d677a
Fix /etc/hostid on root pool deadlock 
Accidentally introduced by dc04a8c which now takes the SCL_VDEV lock
as a reader in zfs_blkptr_verify().  A deadlock can occur if the
/etc/hostid file resides on a dataset in the same pool.  This is
because reading the /etc/hostid file may occur while the caller is
holding the SCL_VDEV lock as a writer.  For example, to perform a
`zpool attach` as shown in the abbreviated stack below.

To resolve the issue we cache the system's hostid when initializing
the spa_t, or when modifying the multihost property.  The cached
value is then relied upon for subsequent accesses.

Call Trace:
    spa_config_enter+0x1e8/0x350 [zfs]
    zfs_blkptr_verify+0x33c/0x4f0 [zfs] <--- trying read lock
    zio_read+0x6c/0x140 [zfs]
    ...
    vfs_read+0xfc/0x1e0
    kernel_read+0x50/0x90
    ...
    spa_get_hostid+0x1c/0x38 [zfs]
    spa_config_generate+0x1a0/0x610 [zfs]
    vdev_label_init+0xa0/0xc80 [zfs]
    vdev_create+0x98/0xe0 [zfs]
    spa_vdev_attach+0x14c/0xb40 [zfs] <--- grabbed write lock

Reviewed-by: loli10K <ezomori.nozomu@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #9256 
Closes #9285
 		2019-09-10 13:42:30 -07:00
..
crypto Add support for selecting encryption backend 2018-08-02 11:59:24 -07:00
fm Add zpool status -s (slow I/Os) and -p (parseable) 2018-11-08 16:47:24 -08:00
fs Fix typos in include/ 2019-08-30 09:53:15 -07:00
lua Fix typos in include/ 2019-08-30 09:53:15 -07:00
sysevent Add TRIM support 2019-03-29 09:13:20 -07:00
Makefile.am OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
abd.h single-chunk scatter ABDs can be treated as linear 2019-06-11 09:02:31 -07:00
aggsum.h OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
arc.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
arc_impl.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
avl.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
avl_impl.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
blkptr.h OpenZFS 8067 - zdb should be able to dump literal embedded block pointer 2017-07-07 11:28:01 -07:00
bplist.h Fast Clone Deletion 2019-07-26 10:54:14 -07:00
bpobj.h Fast Clone Deletion 2019-07-26 10:54:14 -07:00
bptree.h Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
bqueue.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
cityhash.h OpenZFS 8484 - Implement aggregate sum and use for arc counters 2018-06-06 09:35:59 -07:00
dataset_kstats.h port async unlinked drain from illumos-nexenta 2019-02-12 10:41:15 -08:00
dbuf.h Decrease contention on dn_struct_rwlock 2019-07-08 13:18:50 -07:00
ddt.h Remove dedupditto functionality 2019-06-19 14:54:02 -07:00
dmu.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
dmu_impl.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_objset.h Fast Clone Deletion 2019-07-26 10:54:14 -07:00
dmu_recv.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_redact.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_send.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_traverse.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dmu_tx.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
dmu_zfetch.h Replace zf_rwlock with a mutex 2019-07-25 11:57:58 -07:00
dnode.h Fix zil replay panic when TX_REMOVE followed by TX_CREATE 2019-08-28 10:42:02 -07:00
dsl_bookmark.h Fix comments on zfs_bookmark_phys 2019-06-22 16:32:26 -07:00
dsl_crypt.h Allow unencrypted children of encrypted datasets 2019-06-20 12:29:51 -07:00
dsl_dataset.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
dsl_deadlist.h Add fast path for zfs_ioc_space_snaps() handling of empty_bpobj 2019-08-20 11:34:52 -07:00
dsl_deleg.h Remove code for zfs remap 2019-06-24 16:44:01 -07:00
dsl_destroy.h Fast Clone Deletion 2019-07-26 10:54:14 -07:00
dsl_dir.h Fast Clone Deletion 2019-07-26 10:54:14 -07:00
dsl_pool.h Fast Clone Deletion 2019-07-26 10:54:14 -07:00
dsl_prop.h Illumos 6171 - dsl_prop_unregister() slows down dataset eviction. 2016-01-12 10:53:12 -08:00
dsl_scan.h OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
dsl_synctask.h OpenZFS 9425 - channel programs can be interrupted 2019-06-22 16:51:46 -07:00
dsl_userhold.h Illumos #3740 2013-11-04 11:17:48 -08:00
edonr.h OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R 2016-10-03 14:51:15 -07:00
efi_partition.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
frame.h Suppress incorrect objtool warnings 2017-12-07 10:28:50 -08:00
hkdf.h Encryption patch follow-up 2017-10-11 16:54:48 -04:00
metaslab.h Cap metaslab memory usage 2019-08-16 09:08:21 -06:00
metaslab_impl.h Keep more metaslabs loaded 2019-08-29 10:20:36 -07:00
mmp.h MMP interval and fail_intervals in uberblock 2019-03-21 12:47:57 -07:00
mntent.h Make zfs mount according to relatime config in dataset 2016-04-05 18:55:59 -07:00
multilist.h Avoid extra taskq_dispatch() calls by DMU 2019-06-25 12:03:38 -07:00
note.h Update build system and packaging 2018-05-29 16:00:33 -07:00
nvpair.h Add new fnvlist_lookup_* functions 2018-10-03 15:30:55 -07:00
nvpair_impl.h OpenZFS 9580 - Add a hash-table on top of nvlist to speed-up operations 2018-07-30 11:30:03 -07:00
objlist.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
pathname.h Disable unused pathname::pn_path* (unneeded in Linux) 2019-07-15 13:57:56 -07:00
qat.h OpenZFS restructuring - move platform specific sources 2019-09-06 11:26:26 -07:00
range_tree.h Metaslab max_size should be persisted while unloaded 2019-08-05 14:34:27 -07:00
refcount.h Prevent race in blkptr_verify against device removal 2019-08-13 21:24:43 -06:00
rrwlock.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
sa.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
sa_impl.h Linux 4.19-rc3+ compat: Remove refcount_t compat 2018-09-26 10:29:26 -07:00
sdt.h Add line info and SET_ERROR() to ZFS debug log 2017-07-25 23:09:48 -07:00
sha2.h OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R 2016-10-03 14:51:15 -07:00
skein.h OpenZFS 4185 - add new cryptographic checksums to ZFS: SHA-512, Skein, Edon-R 2016-10-03 14:51:15 -07:00
spa.h Fix /etc/hostid on root pool deadlock 2019-09-10 13:42:30 -07:00
spa_boot.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
spa_checkpoint.h Serialize ZTHR operations to eliminate races 2019-01-13 10:09:46 -08:00
spa_checksum.h Implementation of AVX2 optimized Fletcher-4 2016-06-02 14:30:51 -07:00
spa_impl.h Fix /etc/hostid on root pool deadlock 2019-09-10 13:42:30 -07:00
spa_log_spacemap.h Log Spacemap Project 2019-07-16 10:11:49 -07:00
space_map.h Log Spacemap Project 2019-07-16 10:11:49 -07:00
space_reftree.h Illumos #4101, #4102, #4103, #4105, #4106 2014-07-22 09:39:16 -07:00
sysevent.h OpenZFS 6939 - add sysevents to zfs core for commands 2017-07-12 21:28:13 -07:00
trace.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
trace_acl.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_arc.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_common.h OpenZFS 6531 - Provide mechanism to artificially limit disk performance 2016-05-26 10:11:51 -07:00
trace_dbgmsg.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_dbuf.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_dmu.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_dnode.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_multilist.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_rrwlock.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_txg.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_vdev.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
trace_zil.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_zio.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
trace_zrlock.h 8659 static dtrace probes unavailable on non-GPL modules 2019-07-08 11:20:53 -07:00
txg.h OpenZFS 9425 - channel programs can be interrupted 2019-06-22 16:51:46 -07:00
txg_impl.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
u8_textprep.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
u8_textprep_data.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
uberblock.h Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
uberblock_impl.h MMP interval and fail_intervals in uberblock 2019-03-21 12:47:57 -07:00
uio_impl.h deadlock between mm_sem and tx assign in zfs_write() and page fault 2018-10-16 11:11:24 -07:00
unique.h Illumos #3742 2013-11-04 10:55:25 -08:00
uuid.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
vdev.h Add TRIM support 2019-03-29 09:13:20 -07:00
vdev_disk.h Add support for autoexpand property 2018-07-23 15:40:15 -07:00
vdev_file.h Use a dedicated taskq for vdev_file 2016-12-21 10:47:15 -08:00
vdev_impl.h Log Spacemap Project 2019-07-16 10:11:49 -07:00
vdev_indirect_births.h OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
vdev_indirect_mapping.h OpenZFS 7614, 9064 - zfs device evacuation/removal 2018-04-14 12:16:17 -07:00
vdev_initialize.h Add TRIM support 2019-03-29 09:13:20 -07:00
vdev_raidz.h Linux 5.0 compat: SIMD compatibility 2019-07-12 09:31:20 -07:00
vdev_raidz_impl.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
vdev_removal.h panic in removal_remap test on 4K devices 2019-06-13 13:12:39 -07:00
vdev_trim.h Add TRIM support 2019-03-29 09:13:20 -07:00
xvattr.h Linux 4.18 compat: inode timespec -> timespec64 2018-06-19 21:51:18 -07:00
zap.h fat zap should prefetch when iterating 2019-06-12 13:13:09 -07:00
zap_impl.h OpenZFS 7793 - ztest fails assertion in dmu_tx_willuse_space 2017-03-07 09:51:59 -08:00
zap_leaf.h Fix ENOSPC in "Handle zap_add() failures in ..." 2018-04-18 14:19:50 -07:00
zcp.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
zcp_global.h OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
zcp_iter.h OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
zcp_prop.h OpenZFS 7431 - ZFS Channel Programs 2018-02-08 15:28:18 -08:00
zfeature.h Revert "zhack: Add 'feature disable' command" 2016-05-17 11:52:07 -07:00
zfs_acl.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
zfs_context.h Make module tunables cross platform 2019-09-05 14:49:49 -07:00
zfs_debug.h Log Spacemap Project 2019-07-16 10:11:49 -07:00
zfs_delay.h Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_fuid.h Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs_ioctl.h Implement Redacted Send/Receive 2019-06-19 09:48:12 -07:00
zfs_onexit.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zfs_project.h Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_ratelimit.h Change checksum & IO delay ratelimit values 2018-03-04 17:34:51 -08:00
zfs_rlock.h OpenZFS 9689 - zfs range lock code should not be zpl-specific 2018-10-11 10:19:33 -07:00
zfs_sa.h Project Quota on ZFS 2018-02-13 14:54:54 -08:00
zfs_stat.h Support custom build directories and move includes 2010-09-08 12:38:56 -07:00
zfs_sysfs.h Fix in-kernel sysfs entries 2018-09-06 21:44:52 -07:00
zfs_znode.h Fix deadlock in 'zfs rollback' 2019-08-27 09:55:51 -07:00
zil.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
zil_impl.h make zil max block size tunable 2019-06-10 11:48:42 -07:00
zio.h Remove dedupditto functionality 2019-06-19 14:54:02 -07:00
zio_checksum.h Remove dependency on linear ABD 2017-03-29 12:24:51 -07:00
zio_compress.h lz4_decompress_abd declared but not defined 2019-06-13 13:14:34 -07:00
zio_crypt.h Enable SIMD for encryption 2019-09-10 10:45:46 -07:00
zio_impl.h Fix typos in include/ 2019-08-30 09:53:15 -07:00
zio_priority.h Add TRIM support 2019-03-29 09:13:20 -07:00
zrlock.h OpenZFS 6328 - Fix cstyle errors in zfs codebase 2017-01-12 09:42:11 -08:00
zthr.h Fast Clone Deletion 2019-07-26 10:54:14 -07:00
zvol.h Add port of FreeBSD 'volmode' property 2017-07-12 13:05:37 -07:00