This commit fixes https://www.illumos.org/issues/6779.

Chronology of the events:

1. we have an empty directory
2. the filesystem is nearly out of quota
3. a snapshot prevents any space from being f

This commit fixes https://www.illumos.org/issues/6779.

Chronology of the events:

1. we have an empty directory
2. the filesystem is nearly out of quota
3. a snapshot prevents any space from being freed
4. a remote clients calls opendir via nfs4
5. the same client removes the directory
6. the client proceeds with readdir --> boom.

During 4, the client obtains a FH for the directory.
During 5, the directory entry gets removed, the inode is added to the
unlinked set and z_unlinked is set.
Then the inode contents is deleted (dmu_free_long_range).
Deletion of the inode itself fails because the fs ran out of space exactly
at this moment. The inode is left in the unlinked set, the znode is freed.
During 6, the readdir of the client instantiates a new znode for the (empty)
inode, this time with z_unlinked unset.
During zap read, the contents of the empty file is interpreted as a fatzap,
which leads to the crash.

This patch addresses the problem twofold:
1. when instantiating a znode, set z_unlinked when z_links == 0
2. mark the deletion of the inode as netfree (in zfs_rmnode).

refs #3026

(cherry picked from commit 67738a4fd5331c5c62b9fead7a7739afa2476cf9)

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4950 files sometimes can't be removed from a full filesystem
Reviewed by: Adam Leventhal <adam.leventhal@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Sebastien Roy

4950 files sometimes can't be removed from a full filesystem
Reviewed by: Adam Leventhal <adam.leventhal@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Sebastien Roy <sebastien.roy@delphix.com>
Reviewed by: Boris Protopopov <bprotopopov@hotmail.com>
Approved by: Dan McDonald <danmcd@omniti.com>

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4347 ZPL can use dmu_tx_assign(TXG_WAIT)
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Reviewed b

4347 ZPL can use dmu_tx_assign(TXG_WAIT)
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Dan McDonald <danmcd@nexenta.com>
Reviewed by: Boris Protopopov <boris.protopopov@nexenta.com>
Approved by: Dan McDonald <danmcd@nexenta.com>

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3598 want to dtrace when errors are generated in zfs
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@d

3598 want to dtrace when errors are generated in zfs
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

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backout 3006: causes 3046 (panics after mounting root)

3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved b

3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
Reviewed by: Matt Ahrens <matthew.ahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>

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merge with onnv_147
Reviewed by: garrett@nexenta.com
Approved by: garrett@nexenta.com

6971929 Unable to add/remove ACE after doing idmap flush -a

6957974 assertion failed: 0 == sa_lookup(zp->z_sa_hdl, SA_ZPL_ZNODE_ACL(zp->z_zfsvfs)
6960907 zfs_rezget() has uninitialized z_mode variable

6894240 zfs has a partially deleted file

6946681 System panics in a loop with "pf zfs_fuid_create"

6945935 potential mutex problem in zfs_zaccess_aces_check()

6716117 ZFS needs native system attribute infrastructure
6516171 zpl symlinks should have their own object type

6847615 deadlock between zfs_dirent_lock and zfs_rmdir

PSARC/2009/204 ZFS user/group quotas & space accounting
6501037 want user/group quotas on ZFS
6830813 zfs list -t all fails assertion
6827260 assertion failed in arc_read(): hdr == pbuf->b_hdr
681559

PSARC/2009/204 ZFS user/group quotas & space accounting
6501037 want user/group quotas on ZFS
6830813 zfs list -t all fails assertion
6827260 assertion failed in arc_read(): hdr == pbuf->b_hdr
6815592 panic: No such hold X on refcount Y from zfs_znode_move
6759986 zfs list shows temporary %clone when doing online zfs recv

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6790064 zfs needs to determine uid and gid earlier in create process

6765294 Refactor replay

6741237 zfs hang in txg_wait_open() on boot

6343667 scrub/resilver has to start over when a snapshot is taken
6343693 'zpool status' gives delayed start for 'zpool scrub'
6670746 scrub on degraded pool return the status of 'resilver completed'

6343667 scrub/resilver has to start over when a snapshot is taken
6343693 'zpool status' gives delayed start for 'zpool scrub'
6670746 scrub on degraded pool return the status of 'resilver completed'?
6675685 DTL entries are lost resulting in checksum errors
6706404 get_history_one() can dereference off end of hist_event_table[]
6715414 assertion failed: ds->ds_owner != tag in dsl_dataset_rele()
6716437 ztest gets SEGV in arc_released()
6722838 bfu does not update grub

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6573681 deleting a very large file can be slow
6706950 ((&dnp->dn_blkptr[0])->blk_birth == 0) || list_head(list) != 0L || dn->dn_next_blksz[txgoff]

6654808 FIGNORECASE lookups in a zfs xattr dir don't provide 'realname' data
6666748 System panic occurred when attempting to view .zfs snapshot directory from CIFS client.
6693201 libzpool needlessl

6654808 FIGNORECASE lookups in a zfs xattr dir don't provide 'realname' data
6666748 System panic occurred when attempting to view .zfs snapshot directory from CIFS client.
6693201 libzpool needlessly defines u8_textprep_str()
6694236 case-insensitive zfs file system doesn't work when created on sparc and then imported on x86

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6650192 zfs ACL/fuid code could use some minor cleanup
6650223 zdb znode output should include uid/gid and possible SID information
6657644 zfs_fuid_init() panic

6580259 onnv ZFS panic with zfs_purgedir in zfs_dir.c
6617656 zpool destroy should deal with newer pools

6603908 can't change mode if FS/dir is out of quota

6552639 Each zone should have it's own idmapd