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makefs: do not call brelse if bread returns an error

If bread returns an error there is no bp to brelse. One of these
changes was taken from NetBSD commit 0a62dad69f62 ("This works well
enough to p

makefs: do not call brelse if bread returns an error

If bread returns an error there is no bp to brelse. One of these
changes was taken from NetBSD commit 0a62dad69f62 ("This works well
enough to populate..."), the rest were found by looking for the same
pattern.

Reviewed by: imp
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D39069

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msdosfs deget(): add locking flags argument

LK_EXCLUSIVE must be passed always, some consumers need the ability to
specify LK_NOWAIT

Reviewed by: mckusick
Tested by: pho
Sponsored by: The FreeBSD F

msdosfs deget(): add locking flags argument

LK_EXCLUSIVE must be passed always, some consumers need the ability to
specify LK_NOWAIT

Reviewed by: mckusick
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D31464

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Fix makefs bootstrap after d485c77f203fb0f4cdc08dea5ff81631b51d8809

The makefs msdosfs code includes fs/msdosfs/denode.h which directly uses
struct buf from <sys/buf.h> rather than the makefs struct

Fix makefs bootstrap after d485c77f203fb0f4cdc08dea5ff81631b51d8809

The makefs msdosfs code includes fs/msdosfs/denode.h which directly uses
struct buf from <sys/buf.h> rather than the makefs struct m_buf.
To work around this problem provide a local denode.h that includes
ffs/buf.h and defines buf as an alias for m_buf.

Reviewed By: kib, emaste
Differential Revision: https://reviews.freebsd.org/D28835

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Remove #define _KERNEL hacks from libprocstat

Make sys/buf.h, sys/pipe.h, sys/fs/devfs/devfs*.h headers usable in
userspace, assuming that the consumer has an idea what it is for.
Unhide more materi

Remove #define _KERNEL hacks from libprocstat

Make sys/buf.h, sys/pipe.h, sys/fs/devfs/devfs*.h headers usable in
userspace, assuming that the consumer has an idea what it is for.
Unhide more material from sys/mount.h and sys/ufs/ufs/inode.h,
sys/ufs/ufs/ufsmount.h for consumption of userspace tools, with the
same caveat.

Remove unacceptable hack from usr.sbin/makefs which relied on sys/buf.h
being unusable in userspace, where it override struct buf with its own
definition. Instead, provide struct m_buf and struct m_vnode and adapt
code to use local variants.

Reviewed by: mckusick
Tested by: pho
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D28679

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Merge ^/head r352105 through r352307.

buf: Add B_INVALONERR flag to discard data

Setting the B_INVALONERR flag before a synchronous write causes the buf
cache to forcibly invalidate contents if the write fails (BIO_ERROR).

This is inte

buf: Add B_INVALONERR flag to discard data

Setting the B_INVALONERR flag before a synchronous write causes the buf
cache to forcibly invalidate contents if the write fails (BIO_ERROR).

This is intended to be used to allow layers above the buffer cache to make
more informed decisions about when discarding dirty buffers without
successful write is acceptable.

As a proof of concept, use in msdosfs to handle failures to mark the on-disk
'dirty' bit during rw mount or ro->rw update.

Extending this to other filesystems is left as future work.

PR: 210316
Reviewed by: kib (with objections)
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D21539

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Merge ^/head r351317 through r351731.

makefs: share msdosfsmount.h between kernel msdosfs and makefs

Sponsored by: The FreeBSD Foundation

makefs: diff reduction to sys/fs/msdosfs

No functional change.

makefs: share denode.h between kernel msdosfs and makefs

There is no need to duplicate this file when it can be trivially
shared (just exposing sections previously under #ifdef _KERNEL).

MFC with:

makefs: share denode.h between kernel msdosfs and makefs

There is no need to duplicate this file when it can be trivially
shared (just exposing sections previously under #ifdef _KERNEL).

MFC with: r351273
Differential Revision: The FreeBSD Foundation

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makefs: share fat.h between kernel msdosfs and makefs

There is no reason to duplicate this file when it can be trivially
shared (just exposing one section previously under #ifdef _KERNEL).

Reviewed

makefs: share fat.h between kernel msdosfs and makefs

There is no reason to duplicate this file when it can be trivially
shared (just exposing one section previously under #ifdef _KERNEL).

Reviewed by: imp, cem
MFC with: r351273
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21346

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makefs: add msdosfs (FAT) support

Add FAT support to makefs by copying some files from sys/fs/msdosfs/ and
updating others with changes from NetBSD.

The six files copied from sys/fs/msdosfs at r348

makefs: add msdosfs (FAT) support

Add FAT support to makefs by copying some files from sys/fs/msdosfs/ and
updating others with changes from NetBSD.

The six files copied from sys/fs/msdosfs at r348251 and modified are:
denode.h direntry.h fat.h msdosfs_fat.c msdosfs_lookup.c msdosfsmount.h

I would prefer to avoid the duplication, but reluctance to doing so was
expressed in a previous review (D11197); for now copy the files and
revisit in the future.

Submitted by: Siva Mahadevan
Discussed with: cem, imp
MFC after: 1 month
Relnotes: Yes
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D16438

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