Use a different tactic when creating the devsw so that disk_create()
doesn't need to malloc.

Changes to centralise the default blocksize behaviour.
More likely to follow.

Submitted by: phk@freebsd.org

Improve the micro "disk" layer after gaining more experience with it.

Add micro "disk" layer which should enable us to pull all the slice/label
stuff out of the device drivers.

Update the projects tree to a newer FreeBSD current.

Clarify and reimplement the bioq API so that bioq_disksort() has
the correct behaviour (sorting by distance from the current head position
in the scan direction) and bioq_insert_head() and bioq_inser

Clarify and reimplement the bioq API so that bioq_disksort() has
the correct behaviour (sorting by distance from the current head position
in the scan direction) and bioq_insert_head() and bioq_insert_tail()
have a well defined (and useful) behaviour, especially when intermixed
with calls to bioq_disksort().

In particular:
- fix a bug in the existing bioq_disksort() that did not use the
current head position correctly;
- redefine semantics of bioq_insert_head() and bioq_insert_tail().
bioq_insert_tail() can now be used as a barrier
between previous and subsequent calls to bioq_disksort().

The code is heavily documented in the source code so please refer
to that for the details.

Much of this code comes from Fabio Checconi. Also thanks to Kirk
for feedback on the (re)definition of bioq_insert_tail().

NOTE: in the current tree there is only a handful of files which
intermix calls to bioq_disksort() with bioq_insert_head() and
bioq_insert_tail(). The ordering of the queue in these situation
was not specified (nor easy to figure out) before, so I doubt any
of that code could be affected by the specification of the API.

Also note that the current implementation is significantly simpler
than the previous one (also used in ata_sort_queue()).
It would be useful to reimplement ata_sort_queue() using
the same code used in bioq_disksort().

MFC after: 1 week

show more ...

Make bioq_disksort have a ANSI-C definition rather than a K&R definition.

Add a new I/O request - BIO_FLUSH, which basically tells providers below to
flush their caches. For now will mostly be used by disks to flush their
write cache.

Sponsored by: home.pl

Unexpand TAILQ_FIRST(foo) == NULL to TAILQ_EMPTY(foo).

When calling bioq_first() to see if a queue is empty in bioq_disksort(),
don't save the return value as we won't use it.

Noticed by: Coverity Prevent analysis tool
MFC after: 3 days

- Fix insertions of bios which represent data earlier than anything else
in the queue. The insertion sort assumed this had already been taken
care of.

Spotted by: Antoine Brodin
Approved by:

- Fix insertions of bios which represent data earlier than anything else
in the queue. The insertion sort assumed this had already been taken
care of.

Spotted by: Antoine Brodin
Approved by: re (scottl)

show more ...

- Dramatically simplify bioqdisksort(). We no longer do ordered bios so
most of the code to deal with them has been dead for sometime. Simplify
the code by doing an insert sort hinted by the

- Dramatically simplify bioqdisksort(). We no longer do ordered bios so
most of the code to deal with them has been dead for sometime. Simplify
the code by doing an insert sort hinted by the current head position.

Met with apathy by: arch@

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/* -> /*- for copyright notices, minor format tweaks as necessary

Add bioq_insert_head() function.

OK'd by: phk

Add bioq_takefirst().

If the bioq is empty, NULL is returned. Otherwise the front element
is removed and returned.

This can simplify locking in many drivers from:

lock()
bp = bioq_first(bq);
i

Add bioq_takefirst().

If the bioq is empty, NULL is returned. Otherwise the front element
is removed and returned.

This can simplify locking in many drivers from:

lock()
bp = bioq_first(bq);
if (bp == NULL) {
unlock()
return
}
bioq_remove(bp, bq)
unlock
to:
lock()
bp = bioq_takefirst(bq);
unlock()
if (bp == NULL)
return;

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Report bio_pblkbo instead of bio_blkno.

Make bioq_disksort() sort on the bio_offset field instead of bio_pblkno.

Made use of 'error' argument, which was unused (by mistake) before.

Submitted by: Pawel Jakub Dawidek <nick@garage.freebsd.pl>

Use __FBSDID().

Don't include <sys/disklabel.h>

Remove BIO_SETATTR from non-GEOM part of kernel as well.

#include <geom/geom_disk.h>

Introduce bioq_flush() function.

retire the "busy" field in bioqueues, it's served it's purpose.

Preparation commit before I start on the bioqueue lockdown:

Collect all the bits of bioqueue handing in subr_disk.c, vfs_bio.c is big
enough as it is and disksort already lives in subr_disk.c.