zev: calculate beaver-compatible checksums of changes

Ranges required to calculate the checksums will be range locked before
the zev callbacks are called. Checksums are calculated in the zev
module

zev: calculate beaver-compatible checksums of changes

Ranges required to calculate the checksums will be range locked before
the zev callbacks are called. Checksums are calculated in the zev
module and reported to userland. Checksums of all-zeroes blocks are
omitted. Userland is expected to infer that the block must have bee
all-zeroes.

An internal cache is implemented to avoid re-reading the same data
over and over again.

(cherry picked from commit d8e62bab61474da73f26dc58b26d937c9cc17397)

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getgen: bugfix, avoid using wrong zfsvfs pointer

(cherry picked from commit 5d11467c69a9a22b987d4bb271ffd2ad43cee6c4)

nfs4_block_and_wait: code cleanup

(cherry picked from commit 46b536bc69c10dbf33009dc8f90356eaafc8db35)

nfs4 slow file locking: make it even faster and more tunable.

(cherry picked from commit 7853940f198ee7cadb2a6a004901b82972540a7e)

4827 nfs4: slow file locking
4837 NFSv4 client lock retry delay upper limit should be shorter

(cherry picked from commit 99ef4b75bc247bdd229cd0820fccabdb0602cf52)

zev: include fs root inode info in mount events

(cherry picked from commit 5beaf3ad100304461dfab72835f386d63abe8568)

zev: changes for #1891 review (multiplayer)

Review feedback addressed in this commit:

- remove avl, replace with array
- read() can block (but can be interrupted by signals)
- style changes
- q

zev: changes for #1891 review (multiplayer)

Review feedback addressed in this commit:

- remove avl, replace with array
- read() can block (but can be interrupted by signals)
- style changes
- queue threshold can be set to 0 bytes (no delay)
- FIND_QUEUE macro replaced by function
- new mutex to avoid races when queues are full
- zevadm can be told to poll events from a specified queue
- zevadm can create blocking queues

additional changes:

- mark events are delivered without delay

(cherry picked from commit e4ea145c5d454bda934f8af75eec9ea17f2489c0)

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zev: multi-queue support

(cherry picked from commit bc16f3206d5f60ea7a18a972c3a52afb85102b71)

nfs4_do_delegreturn: fix for endless recovery after nfs server reboot.

Issue: https://redmine.ob1.de/issues/799
(cherry picked from commit fed705ad873bc176fde0522f8b470b3a98e35017)

getgen driver added for znode info ioctl()s

The getgen driver provides an ioctl() that can give information
about an inode to userspace that is normally unavailable, such as
the generation number an

getgen driver added for znode info ioctl()s

The getgen driver provides an ioctl() that can give information
about an inode to userspace that is normally unavailable, such as
the generation number and the crtime.

The inode has to be on a ZFS filesystem, and an open fd to any
file on the same filesystem needs to be provided.

(cherry picked from commit c8fa4655f8d4fdaba0469296ede911a6bb63f76b)

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zev: pass removed file's inode info into userland

(cherry picked from commit b23df4380880bf151b06786c591579e8a7abafc7)

zev: remove unnecessary zap_lookup, display ctime

(cherry picked from commit a27b019ed8c12d2702bb90b14500b8932ac1ecd3)

zev: new ioctl (get_gen) and various fixes

(cherry picked from commit 7a84701fb0e8e59f59d30523c82b171d7e510273)

zev: small fix for zev_detach() return value

(cherry picked from commit ff33ba5a948e98d96388e544a519285260587106)

zev: pass xattr flag into userland, fix umount bug

zev events now have a flag in inode structures indicating whether
the inode is part of some file's extended attributes. We use this to
ignore such

zev: pass xattr flag into userland, fix umount bug

zev events now have a flag in inode structures indicating whether
the inode is part of some file's extended attributes. We use this to
ignore such events.

Also, there was a bug in umount: the dsl dataset was freed before it
was used by the zev callback. This wasn't noted before because it was
usually still okay. On debug kernels, the freed space is cleared,
and so it was immediatly visible.

(cherry picked from commit 5be8959620e9c9a4179a80521f9be872ab79b065)

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zev: bugfix - zev_detach return value when busy

zev_detach() returned EBUSY when the module was in use, but should
return DDI_FAILURE.

EBUSY leads to the titanic_7 kernel trying to unload the modul

zev: bugfix - zev_detach return value when busy

zev_detach() returned EBUSY when the module was in use, but should
return DDI_FAILURE.

EBUSY leads to the titanic_7 kernel trying to unload the module, which
will fail in _fini(), and also break functionality because of the partial
execution of _fini().

(cherry picked from commit b36b61981825c480819dc7087eeb3aad5be53d6d)

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zev: fix lint and build warnings

(cherry picked from commit 74cdfce6dd066682a1724b52826d50255f2af3dd)

zev: fixed warning - removed unused variable

(cherry picked from commit 7aed7d4f6fa42851ce9dcaeecaea5c36ebb2a924)

zev: skip mount/umount events for snapshots.

(cherry picked from commit 35f5557688c45a343edf7bae121e177a472ca22b)

zev: bugfix - error events had wrong record size.

(cherry picked from commit 00787cc8a2d0d4dcb6e69efab7719d6c85b6d6cd)

add close_after_update event for any close()

We tried to be clever and get close_after_update events only
for files that have no further open fds after the close() in
question. However, the NFSv4 s

add close_after_update event for any close()

We tried to be clever and get close_after_update events only
for files that have no further open fds after the close() in
question. However, the NFSv4 server seems to keep files open
for much longer than anticipated, so we'd get the events much
too late.

Now we get an event for any close() call on a file, as long
as there's been new data added to the file since the last
time we added the event to the queue.

(cherry picked from commit c27e8300d7cdccf9d8df6abcec04e15846bf7862)

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allow 32-bit ioctl() calls in 64-bit kernels: all structs are now padded and aligned

(cherry picked from commit aadc9bd992b088de347df644453365dff6a4b4d1)

marks can be queued in-between events.

(cherry picked from commit d8d328ed3087e5c59b7f42951ab9dff657ba162a)

struct padding fixed to work with 32 and 64 bit userspace receivers, plus two other small fixes.

(cherry picked from commit 3c715018da3061d1e7dd083ab1699d835073d6ce)

pass multiple events in one read() call; new convenience typedefs in header

(cherry picked from commit 4a804719ddd0b229ab53217aa4c7a44f7466165b)