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Paul Dagnelie c352ec27d5 Illumos 6370 - ZFS send fails to transmit some holes 
6370 ZFS send fails to transmit some holes
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Chris Williamson <chris.williamson@delphix.com>
Reviewed by: Stefan Ring <stefanrin@gmail.com>
Reviewed by: Steven Burgess <sburgess@datto.com>
Reviewed by: Arne Jansen <sensille@gmx.net>
Approved by: Robert Mustacchi <rm@joyent.com>

References:
  https://www.illumos.org/issues/6370
  https://github.com/illumos/illumos-gate/commit/286ef71

In certain circumstances, "zfs send -i" (incremental send) can produce
a stream which will result in incorrect sparse file contents on the
target.

The problem manifests as regions of the received file that should be
sparse (and read a zero-filled) actually contain data from a file that
was deleted (and which happened to share this file's object ID).

Note: this can happen only with filesystems (not zvols, because they do
not free (and thus can not reuse) object IDs).

Note: This can happen only if, since the incremental source (FromSnap),
a file was deleted and then another file was created, and the new file
is sparse (i.e. has areas that were never written to and should be
implicitly zero-filled).

We suspect that this was introduced by 4370 (applies only if hole_birth
feature is enabled), and made worse by 5243 (applies if hole_birth
feature is disabled, and we never send any holes).

The bug is caused by the hole birth feature. When an object is deleted
and replaced, all the holes in the object have birth time zero. However,
zfs send cannot tell that the holes are new since the file was replaced,
so it doesn't send them in an incremental. As a result, you can end up
with invalid data when you receive incremental send streams. As a
short-term fix, we can always send holes with birth time 0 (unless it's
a zvol or a dataset where we can guarantee that no objects have been
reused).

Ported-by: Steven Burgess <sburgess@datto.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4369
Closes #4050
2016-03-10 14:25:22 -08:00
..
arc.c Add l2arc_max_block_size tunable 2016-02-25 09:44:00 -08:00
blkptr.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
bplist.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
bpobj.c Illumos 5810 - zdb should print details of bpobj 2015-05-11 15:10:24 -07:00
bptree.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
bqueue.c Allow 16M send/recv blocks 2016-01-08 20:23:23 -05:00
dbuf_stats.c Illumos 5497 - lock contention on arcs_mtx 2015-06-11 10:27:25 -07:00
dbuf.c Illumos 5045 - use atomic_{inc,dec}_* instead of atomic_add_* 2016-01-15 15:38:36 -08:00
ddt_zap.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
ddt.c Handle zap_lookup() failure in ddt_object_load() 2015-08-19 14:32:50 -07:00
dmu_diff.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
dmu_object.c Illumos 6370 - ZFS send fails to transmit some holes 2016-03-10 14:25:22 -08:00
dmu_objset.c Add support for asynchronous zvol minor operations 2016-03-10 09:49:22 -08:00
dmu_send.c Add support for asynchronous zvol minor operations 2016-03-10 09:49:22 -08:00
dmu_traverse.c Illumos 6370 - ZFS send fails to transmit some holes 2016-03-10 14:25:22 -08:00
dmu_tx.c Illumos 4950 - files sometimes can't be removed from a full filesystem 2016-01-21 16:59:30 -08:00
dmu_zfetch.c Illumos 6281 - prefetching should apply to 1MB reads 2016-01-12 13:51:27 -08:00
dmu.c Illumos 4950 - files sometimes can't be removed from a full filesystem 2016-01-21 16:59:30 -08:00
dnode_sync.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
dnode.c Illumos 5987 - zfs prefetch code needs work 2016-01-12 09:02:33 -08:00
dsl_bookmark.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_dataset.c Add support for asynchronous zvol minor operations 2016-03-10 09:49:22 -08:00
dsl_deadlist.c Handle damaged blk_birth in dsl_deadlist_insert() 2015-12-15 16:12:31 -08:00
dsl_deleg.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_destroy.c Add support for asynchronous zvol minor operations 2016-03-10 09:49:22 -08:00
dsl_dir.c Add support for asynchronous zvol minor operations 2016-03-10 09:49:22 -08:00
dsl_pool.c Align thread priority with Linux defaults 2015-07-28 13:36:47 -07:00
dsl_prop.c Illumos 6171 - dsl_prop_unregister() slows down dataset eviction. 2016-01-12 10:53:12 -08:00
dsl_scan.c Illumos 6537 - Panic on zpool scrub with DEBUG kernel 2016-02-05 11:29:32 -08:00
dsl_synctask.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
dsl_userhold.c Illumos 4951 - ZFS administrative commands should use reserved space 2015-05-04 09:41:10 -07:00
fm.c Illumos 5045 - use atomic_{inc,dec}_* instead of atomic_add_* 2016-01-15 15:38:36 -08:00
gzip.c cstyle: Resolve C style issues 2013-12-18 16:46:35 -08:00
lz4.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
lzjb.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
Makefile.in Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
metaslab.c Remove fastwrite mutex 2016-01-15 15:38:35 -08:00
multilist.c Identify locks flagged by lockdep 2015-12-22 10:21:33 -08:00
range_tree.c Illumos 5163 - arc should reap range_seg_cache 2015-06-25 08:58:16 -07:00
refcount.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
rrwlock.c Illumos 5008 - lock contention (rrw_exit) while running a read only load 2015-07-06 09:34:13 -07:00
sa.c Prevent SA length overflow 2015-12-30 13:20:12 -08:00
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 Illumos 3749 - zfs event processing should work on R/O root filesystems 2016-01-12 14:42:32 -08:00
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 Illumos 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
spa_misc.c Change KM_SLEEP to TQ_SLEEP in spa_deadman() 2016-03-09 10:41:31 -08:00
spa_stats.c Illumos 5369 - arc flags should be an enum 2015-06-11 10:27:25 -07:00
spa.c Add support for asynchronous zvol minor operations 2016-03-10 09:49:22 -08:00
space_map.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
space_reftree.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
trace.c Illumos 5497 - lock contention on arcs_mtx 2015-06-11 10:27:25 -07:00
txg.c Increase default user space stack size 2016-01-13 13:55:12 -08:00
uberblock.c Illumos 5347 - idle pool may run itself out of space 2015-07-14 10:35:21 -07:00
unique.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
vdev_cache.c Illumos 5045 - use atomic_{inc,dec}_* instead of atomic_add_* 2016-01-15 15:38:36 -08:00
vdev_disk.c Fix use-after-free in vdev_disk_physio_completion 2015-10-13 15:25:33 -07:00
vdev_file.c Disable LBA weighting on files and SSDs 2015-09-01 15:22:07 -07:00
vdev_label.c Illumos 6414 - vdev_config_sync could be simpler 2016-01-28 12:44:39 -05:00
vdev_mirror.c FreeBSD r256956: Improve ZFS N-way mirror read performance by using load and locality information. 2016-02-26 11:24:35 -08:00
vdev_missing.c Illumos #5244 - zio pipeline callers should explicitly invoke next stage 2015-04-30 15:07:47 -07:00
vdev_queue.c FreeBSD r256956: Improve ZFS N-way mirror read performance by using load and locality information. 2016-02-26 11:24:35 -08:00
vdev_raidz.c Illumos #5244 - zio pipeline callers should explicitly invoke next stage 2015-04-30 15:07:47 -07:00
vdev_root.c Illumos #3598 2013-10-31 14:58:04 -07:00
vdev.c Identify locks flagged by lockdep 2015-12-22 10:21:33 -08:00
zap_leaf.c Illumos 5314 - Remove "dbuf phys" db->db_data pointer aliases in ZFS 2015-04-28 16:25:20 -07:00
zap_micro.c Add zap_prefetch() interface 2015-12-04 09:39:20 -08:00
zap.c Illumos 5960, 5925 2016-01-08 15:08:19 -08:00
zfeature_common.c Illumos 5959 - clean up per-dataset feature count code 2015-12-04 14:20:20 -08:00
zfeature.c Illumos 5959 - clean up per-dataset feature count code 2015-12-04 14:20:20 -08:00
zfs_acl.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
zfs_byteswap.c Add linux kernel module support 2010-08-31 13:41:58 -07:00
zfs_ctldir.c Hold the zfs_snapentry_t before dispatch 2015-12-14 12:06:31 -08:00
zfs_debug.c Add dbgmsg kstat 2015-09-04 16:08:14 -07:00
zfs_dir.c Illumos 4950 - files sometimes can't be removed from a full filesystem 2016-01-21 16:59:30 -08:00
zfs_fm.c Remove wrong ASSERT in annotate_ecksum 2016-02-17 10:43:02 -08:00
zfs_fuid.c Illumos #3522 2013-10-30 14:51:27 -07:00
zfs_ioctl.c Add support for asynchronous zvol minor operations 2016-03-10 09:49:22 -08:00
zfs_log.c Illumos 5027 - zfs large block support 2015-05-11 12:23:16 -07:00
zfs_onexit.c zfsdev_getminor() should check for invalid file handles 2015-06-22 17:02:13 -07:00
zfs_replay.c Linux AIO Support 2014-09-05 15:11:43 -07:00
zfs_rlock.c Change KM_PUSHPAGE -> KM_SLEEP 2015-01-16 14:41:26 -08:00
zfs_sa.c Prevent SA length overflow 2015-12-30 13:20:12 -08:00
zfs_vfsops.c Fix zsb->z_hold_mtx deadlock 2016-01-15 15:33:45 -08:00
zfs_vnops.c llumos 6334 - Cannot unlink files when over quota 2016-01-26 15:27:08 -08:00
zfs_znode.c Illumos 4950 - files sometimes can't be removed from a full filesystem 2016-01-21 16:59:30 -08:00
zil.c Align thread priority with Linux defaults 2015-07-28 13:36:47 -07:00
zio_checksum.c Illumos 4757, 4913 2014-08-01 14:28:05 -07:00
zio_compress.c Illumos 5661 - ZFS: "compression = on" should use lz4 if feature is enabled 2015-07-10 12:11:45 -07:00
zio_inject.c Illumos 5045 - use atomic_{inc,dec}_* instead of atomic_add_* 2016-01-15 15:38:36 -08:00
zio.c Illumos 5438 - zfs_blkptr_verify should continue after zfs_panic_recover 2016-01-12 13:54:05 -08:00
zle.c Update core ZFS code from build 121 to build 141. 2010-05-28 13:45:14 -07:00
zpl_ctldir.c Linux 3.18 compat: Snapshot auto-mounting 2015-08-31 13:54:39 -07:00
zpl_export.c zfsctl: No need to sync ctldir inodes 2015-08-31 13:54:39 -07:00
zpl_file.c Linux 4.1 compat: loop device on ZFS 2015-08-24 10:17:06 -07:00
zpl_inode.c Handling negative dentries in a CI file system. 2016-02-02 13:59:00 -08:00
zpl_super.c Disable zpl_nr_cached_objects() callback 2015-09-25 12:45:42 -07:00
zpl_xattr.c Linux 4.5 compat: xattr list handler 2016-01-20 11:36:56 -08:00
zrlock.c Illumos 5812 - assertion failed in zrl_tryenter(): zr_owner==NULL 2015-04-30 14:43:40 -07:00
zvol.c Fix lock order inversion with zvol_open() 2016-03-10 09:53:36 -08:00