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89b1cd6581
mirror_zfs/module/zfs
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smh 89b1cd6581 Prevent ZFS leaking pool free space 
When processing async destroys ZFS would leak space every txg timeout
(5 seconds by default), if no writes occurred, until the pool is totally
full. At this point it would be unfixable without a pool recreation.

In addition if the machine was rebooted with the pool in this situation
would fail to import on boot, hanging indefinitely, as the import process
requires the ability to write data to the pool. Any attempts to query
the pool status during the hung import would not return as the import
holds the pool lock.

The only way to import such a pool would be to specify -o readonly=on
to the zpool import.

zdb -bb <pool> can be used to check for "deferred free" size which is
where this lost space will be counted.

References:
  https://github.com/freebsd/freebsd/commit/48431b7
  http://svnweb.freebsd.org/base?view=revision&revision=273158
  https://reviews.csiden.org/r/132/

Porting notes:

This issue was filed as illumos 5347 and a more comprehensive fix is
under review.  Once that change is finalized it will be integrated, in
the meanwhile the FreeBSD fix has been merged to prevent the issue.

Ported by: Tim Chase <tim@chase2k.com>
Signed-off-by: Matthew Ahrens mahrens@delphix.com
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2896
2014-11-17 11:35:38 -08:00
..
arc.c Fix dprintf format specifiers 2014-11-17 11:13:45 -08:00
blkptr.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
bplist.c Illumos #3464 2013-09-04 16:01:24 -07:00
bpobj.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
bptree.c Fix dprintf format specifiers 2014-11-17 11:13:45 -08:00
dbuf_stats.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
dbuf.c Undirty freed spill blocks. 2014-11-17 11:25:48 -08:00
ddt_zap.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
ddt.c Change the default 'zfs_dedup_prefetch' value to '0' 2014-09-04 09:50:45 -07:00
dmu_diff.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
dmu_object.c Illumos 3693 - restore_object uses at least two transactions to restore an object 2014-10-21 15:26:50 -07:00
dmu_objset.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
dmu_send.c Illumos 5162 - zfs recv should use loaned arc buffer to avoid copy 2014-10-21 16:32:11 -07:00
dmu_traverse.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
dmu_tx.c Improve reporting of tx assignment wait times 2014-03-04 12:22:24 -08:00
dmu_zfetch.c Use enum type(zfetch_dirn_t) instead 2014-01-23 12:56:33 -08:00
dmu.c Illumos 5162 - zfs recv should use loaned arc buffer to avoid copy 2014-10-21 16:32:11 -07:00
dnode_sync.c Illumos 5117 - spacemap reallocation can cause corruption 2014-09-08 09:42:39 -07:00
dnode.c Illumos 5139 - SEEK_HOLE failed to report a hole at end of file 2014-09-23 10:38:45 -07:00
dsl_bookmark.c Illumos 4368, 4369. 2014-07-29 10:55:29 -07:00
dsl_dataset.c Illumos 5150 - zfs clone of a defer_destroy snapshot causes strangeness 2014-10-21 15:26:58 -07:00
dsl_deadlist.c Illumos #3104: eliminate empty bpobjs 2013-01-08 10:35:43 -08:00
dsl_deleg.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
dsl_destroy.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
dsl_dir.c Illumos 4171, 4172 2014-07-25 16:40:07 -07:00
dsl_pool.c Illumos 4958 zdb trips assert on pools with ashift >= 0xe 2014-10-23 15:30:32 -07:00
dsl_prop.c Check the dataset type more rigorously when fetching properties. 2014-05-06 10:41:46 -07:00
dsl_scan.c Prevent ZFS leaking pool free space 2014-11-17 11:35:38 -08:00
dsl_synctask.c Export symbols dsl_sync_task{_nowait} 2014-03-07 10:01:36 -08:00
dsl_userhold.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
fm.c Fixed memory leaks in zevent handling 2014-08-20 10:45:16 -07:00
gzip.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
lz4.c Illumos #4936 fix potential overflow in lz4 2014-07-01 14:10:47 -07:00
lzjb.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
Makefile.in Swap DTRACE_PROBE* with Linux tracepoints 2014-11-17 11:13:55 -08:00
metaslab.c Illumos 5213 - panic in metaslab_init due to space_map_open returning ENXIO 2014-11-14 15:37:45 -08:00
range_tree.c Illumos 4976-4984 - metaslab improvements 2014-08-18 08:40:49 -07:00
refcount.c Illumos #3464 2013-09-04 16:01:24 -07:00
rrwlock.c Fix several new KM_SLEEP warnings 2013-09-25 15:44:22 -07:00
sa.c Calculate header size correctly in sa_find_sizes() 2014-05-19 11:55:50 -07:00
sha256.c Add linux sha2 support 2010-08-31 13:41:59 -07:00
spa_boot.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
spa_config.c Update utsname support 2014-10-17 14:58:57 -07:00
spa_errlog.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
spa_history.c Update utsname support 2014-10-17 14:58:57 -07:00
spa_misc.c Swap DTRACE_PROBE* with Linux tracepoints 2014-11-17 11:13:55 -08:00
spa_stats.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
spa.c Illumos 4924 - LZ4 Compression for metadata 2014-10-20 16:17:49 -07:00
space_map.c Fix dprintf format specifiers 2014-11-17 11:13:45 -08:00
space_reftree.c Illumos #4101, #4102, #4103, #4105, #4106 2014-07-22 09:39:16 -07:00
trace.c Swap DTRACE_PROBE* with Linux tracepoints 2014-11-17 11:13:55 -08:00
txg.c Illumos 4753 - increase number of outstanding async writes when sync task is waiting 2014-09-23 13:50:55 -07:00
uberblock.c Illumos #3598 2013-10-31 14:58:04 -07:00
unique.c Switch KM_SLEEP to KM_PUSHPAGE 2012-08-27 12:01:37 -07:00
vdev_cache.c Illumos 4370, 4371 2014-07-28 14:29:58 -07:00
vdev_disk.c Illumos #4374 2014-07-30 09:20:35 -07:00
vdev_file.c Honor zfs_nocacheflush for file vdevs 2014-05-19 13:30:48 -07:00
vdev_label.c Fix function call with uninitialized value in vdev_inuse 2014-09-23 10:32:45 -07:00
vdev_mirror.c Handle NULL mirror child vdev 2014-10-17 14:59:05 -07:00
vdev_missing.c Illumos #3598 2013-10-31 14:58:04 -07:00
vdev_queue.c Illumos 4753 - increase number of outstanding async writes when sync task is waiting 2014-09-23 13:50:55 -07:00
vdev_raidz.c Illumos #4045 write throttle & i/o scheduler performance work 2013-12-06 09:32:43 -08:00
vdev_root.c Illumos #3598 2013-10-31 14:58:04 -07:00
vdev.c Illumos 5213 - panic in metaslab_init due to space_map_open returning ENXIO 2014-11-14 15:37:45 -08:00
zap_leaf.c Illumos #4374 2014-07-30 09:20:35 -07:00
zap_micro.c Add object type checking to zap_lockdir() 2014-09-08 09:15:38 -07:00
zap.c Fix dprintf format specifiers 2014-11-17 11:13:45 -08:00
zfeature_common.c Illumos 4924 - LZ4 Compression for metadata 2014-10-20 16:17:49 -07:00
zfeature.c Illumos 4370, 4371 2014-07-28 14:29:58 -07:00
zfs_acl.c Don't perform ACL-to-mode translation on empty ACL 2014-10-21 09:23:27 -07:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Illumos 4368, 4369. 2014-07-29 10:55:29 -07:00
zfs_debug.c Swap DTRACE_PROBE* with Linux tracepoints 2014-11-17 11:13:55 -08:00
zfs_dir.c Revert "Revert "Revert "Fix unlink/xattr deadlock""" 2014-08-11 16:12:36 -07:00
zfs_fm.c Fixed memory leaks in zevent handling 2014-08-20 10:45:16 -07:00
zfs_fuid.c Illumos #3522 2013-10-30 14:51:27 -07:00
zfs_ioctl.c Swap DTRACE_PROBE* with Linux tracepoints 2014-11-17 11:13:55 -08:00
zfs_log.c Only commit the ZIL once in zpl_writepages() (msync() case). 2013-11-23 15:08:29 -08:00
zfs_onexit.c Illumos #3598 2013-10-31 14:58:04 -07:00
zfs_replay.c Linux AIO Support 2014-09-05 15:11:43 -07:00
zfs_rlock.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
zfs_sa.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
zfs_vfsops.c Fix dprintf format specifiers 2014-11-17 11:13:45 -08:00
zfs_vnops.c Remove checks for mandatory locks 2014-10-22 11:06:53 -07:00
zfs_znode.c Remove checks for mandatory locks 2014-10-22 11:06:53 -07:00
zil.c Export symbols for ZIL interface 2014-11-14 14:39:43 -08:00
zio_checksum.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
zio_compress.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
zio_inject.c Illumos 4914 - zfs on-disk bookmark structure should be named *_phys_t 2014-08-06 14:48:41 -07:00
zio.c Illumos 4958 zdb trips assert on pools with ashift >= 0xe 2014-10-23 15:30:32 -07:00
zle.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zpl_ctldir.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
zpl_export.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
zpl_file.c Suppress AIO kmem warnings 2014-10-20 16:10:25 -07:00
zpl_inode.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
zpl_super.c Remove shrink_dcache_memory() and shrink_icache_memory() 2014-10-17 14:58:50 -07:00
zpl_xattr.c Linux AIO Support 2014-09-05 15:11:43 -07:00
zrlock.c Export ZFS symbols needed by Lustre. 2010-09-17 16:24:15 -07:00
zvol.c Use long holds in zvol_set_volsize() 2014-01-14 14:46:12 -08:00