linux-kernel - Re: -tip: block, fuse: Fix build error in fs/fuse/dev.c

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Date:	Sat, 11 Jul 2009 13:10:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Miklos Szeredi <miklos@...redi.hu>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: -tip: block, fuse: Fix build error in fs/fuse/dev.c


* Jean Delvare <khali@...ux-fr.org> wrote:

> Hi Ingo,
> 
> On Sat, 11 Jul 2009 09:52:01 +0200, Ingo Molnar wrote:
> > Today's upstream tree build (x86, 64-bit, allnoconfig+CONFIG_FUSE) 
> > failed with this build error:
> > 
> >   fs/fuse/dev.c: In function ‘request_end’:
> >   fs/fuse/dev.c:290: error: ‘BLK_RW_SYNC’ undeclared (first use in this function)
> >   fs/fuse/dev.c:290: error: (Each undeclared identifier is reported only once
> >   fs/fuse/dev.c:290: error: for each function it appears in.)
> >   fs/fuse/dev.c:291: error: ‘BLK_RW_ASYNC’ undeclared (first use in this function)
> > 
> > Due to commit:
> > 
> >   8aa7e84: Fix congestion_wait() sync/async vs read/write confusion
> > 
> > Creating a dependency of BDI callbacks on the BLK_RW_* constants,
> > while those constants are only defined if CONFIG_BLOCK is enabled.
> > 
> > Fix it the simplest way for now, by moving the definitions early
> > in blkdev.h (this cannot break anything), but the real fix would
> > be to split up blkdev.h into blkdev-types.h and blkdev-api.h and
> > make only the API definitions/declarations dependent on
> > CONFIG_BLOCK.
> > 
> > Cc: Jens Axboe <jens.axboe@...cle.com>
> > Cc: Miklos Szeredi <mszeredi@...e.cz>
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> > ---
> >  include/linux/blkdev.h |   13 ++++++++-----
> >  1 files changed, 8 insertions(+), 5 deletions(-)
> > 
> > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> > index 49ae079..a3cdc6d 100644
> > --- a/include/linux/blkdev.h
> > +++ b/include/linux/blkdev.h
> > @@ -1,6 +1,14 @@
> >  #ifndef _LINUX_BLKDEV_H
> >  #define _LINUX_BLKDEV_H
> >  
> > +/*
> > + * Definitions used on the !CONFIG_BLOCK case too:
> > + */
> > +enum {
> > +	BLK_RW_ASYNC	= 0,
> > +	BLK_RW_SYNC	= 1,
> > +};
> > +
> >  #ifdef CONFIG_BLOCK
> >  
> >  #include <linux/sched.h>
> > @@ -70,11 +78,6 @@ enum rq_cmd_type_bits {
> >  	REQ_TYPE_ATA_PC,
> >  };
> >  
> > -enum {
> > -	BLK_RW_ASYNC	= 0,
> > -	BLK_RW_SYNC	= 1,
> > -};
> > -
> >  /*
> >   * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being
> >   * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a
> 
> I have hit this build issue as well, but with CONFIG_BLOCK=y, so 
> the patch above does NOT fix it. The problem I see is that 
> fs/fuse/dev.c does not include <linux/blkdev.h> so it doesn't get 
> the definitions regardless of the configuration. Same problem in 
> fs/nfs/write.c. The patch below fixes it for me:

Yes, that's a different build bug already fixed in latest upstream:

 097041e: fuse: Fix build error

	Ingo
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