zev: zevadm now uses tmpqueue as a default for polling

zevadm poll mode used to create a non-persistent queue to receive
events. The new tmpqueue device is now used instead. Functionality
remains

zev: zevadm now uses tmpqueue as a default for polling

zevadm poll mode used to create a non-persistent queue to receive
events. The new tmpqueue device is now used instead. Functionality
remains the same. However, the tmpqueue will always be empty when
created, while the old method allowed the option of seeing older
zev events in the new queue, if available. This was rarely useful,
though, and can still be done by creating an explicit persistent queue
first.

(cherry picked from commit 22534ac1f0111cc26337b8b0247422f4f1ab1d7f)

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zev: zevadm show queue size as percentage

zevadm no longer displays the wakeup threshold. Instead, the
length of a queue (in zevadm -l) is now displayed both as an
absolute value and as a percentag

zev: zevadm show queue size as percentage

zevadm no longer displays the wakeup threshold. Instead, the
length of a queue (in zevadm -l) is now displayed both as an
absolute value and as a percentage of the maximum queue length.

(cherry picked from commit ff6c736fc4505b616c8d23a2b00f8bcd50449090)

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zev: new ioctl() to query ABI version

A new ioctl() has been added to query the module for it's
version numbers. These are supposed to give an indication of
which behaviour and which feature set ca

zev: new ioctl() to query ABI version

A new ioctl() has been added to query the module for it's
version numbers. These are supposed to give an indication of
which behaviour and which feature set can be expected to work.

(cherry picked from commit f63c8e0930c25065bb397bcbbe45afb4f170fc96)

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zevadm: add -E option for non-empty temp queues

In -p mode without a queue, a temporary queue is created to poll for current
zev events. If one of the existing zev queues has a backlog, it may be
de

zevadm: add -E option for non-empty temp queues

In -p mode without a queue, a temporary queue is created to poll for current
zev events. If one of the existing zev queues has a backlog, it may be
desired to peek at the oldes event still queued, which can be done with the
combination of -p and -E.

(cherry picked from commit fb060709e9968994460ae1ec0f6e1ba3380575ab)

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zevadm: sort getopt letters to find a free one

(cherry picked from commit c2e7f0f3d40cfb4b0be69df9e2e829b18d88d8cd)

zevadm: add option to dump spool file

(cherry picked from commit f766c05e63f43019fadfd2c5bdb551ffc2cd0d0a)

zevadm: print payload for mark events in -p mode

In newer beaver versions, payload is the rid.

(cherry picked from commit 2b3e33c33d41d238dc28dcbe89719af7f60074ce)

zevadm: make temporary queue non-blocking and initially empty

When zevadm is used without -q, a temporarily created queue is used. The
normal use case of this call is debugging current events. The s

zevadm: make temporary queue non-blocking and initially empty

When zevadm is used without -q, a temporarily created queue is used. The
normal use case of this call is debugging current events. The stream of
events should start after the call to zevadm -p, hence the shift to the
initlally empty flag. Debugging should not lead to blocking systems, no
matter how slow the events are printed to the reader's terminal, hence the
non-blocking flag.

(cherry picked from commit a9097a45d68e3e619b07b2e7deaa22e3fce0deb2)

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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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zevadm: flush stdout on sigint

(cherry picked from commit d0bd401f83b277c493d603ef0777bfdd04629cdb)

zev: umount events include info of covered inode

A ZFS umount will now be reported including information of
the inode that the filesystem was mounted over. (the mountpoint
that will now become visib

zev: umount events include info of covered inode

A ZFS umount will now be reported including information of
the inode that the filesystem was mounted over. (the mountpoint
that will now become visible again)

(cherry picked from commit 808e6c04e8d170f4444fe287cf08403bdf1a757c)

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zev: option to create empty queues

New zev queues where filled with as many events as would fit from
the global event backlog. Now a flag can be set to skip this step.
The new queue will then be em

zev: option to create empty queues

New zev queues where filled with as many events as would fit from
the global event backlog. Now a flag can be set to skip this step.
The new queue will then be empty upon creation and will only receive
events newer than the queue itself.

(cherry picked from commit 6970b7d9a5856021f673d67e8ba9f061c20eac54)

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zevadm: fixed segfault for missing parameter

(cherry picked from commit 9cced931c4e08136c492318b3126186124804e9a)

zevadm: add 'report' mode

zevadm has a new report mode which will write zev stats into
files. The base filename is given, and will be appended with
the current date. At midnight, a new file is cre

zevadm: add 'report' mode

zevadm has a new report mode which will write zev stats into
files. The base filename is given, and will be appended with
the current date. At midnight, a new file is created and used.
The content is zevstat output for 60 second intervals.

(cherry picked from commit 079f408df9d389b9bdaa3a32b01df17fd58e802f)

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zevadm: better option parsing for zevstat

when called as zevstat, zevadm now displays a zevstat usage.
It also looks for a -v switch and the interval and count
parameters actually work.

(cherry pic

zevadm: better option parsing for zevstat

when called as zevstat, zevadm now displays a zevstat usage.
It also looks for a -v switch and the interval and count
parameters actually work.

(cherry picked from commit 54da422bc6175dcf026cc1391a2526620a7dade1)

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zevadm: bugfixes for zevstat mode

Draining the new queue was done until poll() with a one
second timeout return 0. On busy systems this never happens.
Now poll() without a timeout must return 0.

W

zevadm: bugfixes for zevstat mode

Draining the new queue was done until poll() with a one
second timeout return 0. On busy systems this never happens.
Now poll() without a timeout must return 0.

When called as zevstat, giving no interval parameter caused a
core dump.

(cherry picked from commit 9ccd4f509e10a1bd670ce35e6f03aae00d7ca2d4)

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zevadm: zevstat mode to show system activity

(cherry picked from commit ffacc4c18995665fffe3c01cdce2e14f424bc57c)

zevadm: bugfix with option parsing

Option parsing was order dependent. For example, "-p -v" ignored
the "-v" option while "-v -p" worked. Order does not matter
anymore.

(cherry picked from commit

zevadm: bugfix with option parsing

Option parsing was order dependent. For example, "-p -v" ignored
the "-v" option while "-v -p" worked. Order does not matter
anymore.

(cherry picked from commit 4e01af0f92d75b7f57a617a8fbdd9dccc5077037)

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zev: create and symlink events now inlude checksum

When a symlink or another new file is created, the resulting
zev events now include a signature for the new file.

Symlinks are treated like files

zev: create and symlink events now inlude checksum

When a symlink or another new file is created, the resulting
zev events now include a signature for the new file.

Symlinks are treated like files that contain the "link" part
as text. Block and character devices have a signature based
on the format string "%c%d,%d", with 'b'/'c', getmajor() and
getminor() as values. All other file types will result in an
all-zero signature.

Hardlinks create a new directory entry, but no new inode.
Therefore, rdlink events still do not contain a signature.

(cherry picked from commit d27baf235074c236575a6c7ec7d3fe89a7d8af6e)

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zev: add txg to applicable event type records

(cherry picked from commit be5f9b3c721e52d475c3d7009982992c01c9140e)

zev: zevadm -v now outputs all data in events

(cherry picked from commit 48ead878f6c5ed593c292e6cb4396521eca8767f)

zev: ioctl() to get signatures for an open file

There's a new ioctl() ZEV_IOC_GET_FILE_SIGNATURES to get
beaver signatures for a data range in an open file. The
provided buffer has to be large enou

zev: ioctl() to get signatures for an open file

There's a new ioctl() ZEV_IOC_GET_FILE_SIGNATURES to get
beaver signatures for a data range in an open file. The
provided buffer has to be large enough to hold the parameters
and the signatures.

zevadm can display a file's signatures using 'zevadm -c <filename>'

(cherry picked from commit 6b4c2eb9a413da85091774d0095ad61946ae043d)

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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: 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)