zev: added inode info of clobbered files (rename)

When a file is renamed, another file might previously have had
the new name and will thus be clobbered. In this case, the inode
information of the

zev: added inode info of clobbered files (rename)

When a file is renamed, another file might previously have had
the new name and will thus be clobbered. In this case, the inode
information of the clobbered file will be added to the zev rename
event. Note that the file might still have other names.

(cherry picked from commit 9ed9bfe91df7eb8d10c125f9f04d3ec82010930a)

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zev: add txg to applicable event type records

(cherry picked from commit be5f9b3c721e52d475c3d7009982992c01c9140e)

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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zev: pass removed file's inode info into userland

(cherry picked from commit b23df4380880bf151b06786c591579e8a7abafc7)

zfs write event hooks and ioctl()s

(cherry picked from commit aa07598031147c52f81912f0df6e0a894197013a)
(cherry picked from commit 37c9dfdcd7996a38d49ff19a6e16a256162979e8)