Where are these buffer_xxx macros/fucntion defined?

Where are these buffer_xxx macros/fucntion defined?

[Kumar amit mehta]

Hi,

I see that a lot of FS code is using buffer_invalidate(), buffer_req() 
etc, but I could not find the definition of these anywhere in the tree.
What am i missing? For example, see ext3 code using buffer_invalidate()
here[1].

For building cscope and tags database, I invoke the following command
from the top of the tree:
$ make cscope tags

[1] http://lxr.linux.no/#linux+v3.10/fs/ext3/namei.c#L926

Thanks,
Amit

Where are these buffer_xxx macros/fucntion defined?

[Kumar amit mehta]

On Tue, Jul 09, 2013 at 01:21:42AM -0700, Anand Moon wrote:
> Hi Kumar Amit,
> ?
> These function are define in 
> ?
> ?
> http://lxr.linux.no/linux+v3.10/include/linux/buffer_head.h
> ?
> ?
> The ## (double number sign) operator concatenates two tokens in a macro invocation (text and/or arguments) given in a macro definition
> ?
> ?
> /*
> ?* Emit the buffer bitops functions.?? Note that there are also functions
> ?* of the form "mark_buffer_foo()".? These are higher-level functions which
> ?* do something in addition to setting a b_state bit.
> ?*/
> BUFFER_FNS(Uptodate, uptodate)
> BUFFER_FNS(Dirty, dirty)
> TAS_BUFFER_FNS(Dirty, dirty)
> BUFFER_FNS(Lock, locked)
> BUFFER_FNS(Req, req)
> TAS_BUFFER_FNS(Req, req)
> BUFFER_FNS(Mapped, mapped)
> BUFFER_FNS(New, new)
> BUFFER_FNS(Async_Read, async_read)
> BUFFER_FNS(Async_Write, async_write)
> BUFFER_FNS(Delay, delay)
> BUFFER_FNS(Boundary, boundary)
> BUFFER_FNS(Write_EIO, write_io_error)
> BUFFER_FNS(Unwritten, unwritten)
> BUFFER_FNS(Meta, meta)
> BUFFER_FNS(Prio, prio)
> 
> These function get expanded before we compile the kernel.

Thank you Anand. 

Where are these buffer_xxx macros/fucntion defined?

[Anand Moon]

Hi Kumar Amit,
?
These function are define in 
?
?
http://lxr.linux.no/linux+v3.10/include/linux/buffer_head.h
?
?
The ## (double number sign) operator concatenates two tokens in a macro invocation (text and/or arguments) given in a macro definition
?
?
/*
?* Emit the buffer bitops functions.?? Note that there are also functions
?* of the form "mark_buffer_foo()".? These are higher-level functions which
?* do something in addition to setting a b_state bit.
?*/
BUFFER_FNS(Uptodate, uptodate)
BUFFER_FNS(Dirty, dirty)
TAS_BUFFER_FNS(Dirty, dirty)
BUFFER_FNS(Lock, locked)
BUFFER_FNS(Req, req)
TAS_BUFFER_FNS(Req, req)
BUFFER_FNS(Mapped, mapped)
BUFFER_FNS(New, new)
BUFFER_FNS(Async_Read, async_read)
BUFFER_FNS(Async_Write, async_write)
BUFFER_FNS(Delay, delay)
BUFFER_FNS(Boundary, boundary)
BUFFER_FNS(Write_EIO, write_io_error)
BUFFER_FNS(Unwritten, unwritten)
BUFFER_FNS(Meta, meta)
BUFFER_FNS(Prio, prio)

These function get expanded before we compile the kernel.
?
-Anand Moon
? 

________________________________
 From: Kumar amit mehta <gmate.amit@gmail.com>
To: kernelnewbies at kernelnewbies.org 
Sent: Tuesday, July 9, 2013 7:51 AM
Subject: Where are these buffer_xxx macros/fucntion defined?
  

Hi,

I see that a lot of FS code is using buffer_invalidate(), buffer_req() 
etc, but I could not find the definition of these anywhere in the tree.
What am i missing? For example, see ext3 code using buffer_invalidate()
here[1].

For building cscope and tags database, I invoke the following command
from the top of the tree:
$ make cscope tags

[1] http://lxr.linux.no/#linux+v3.10/fs/ext3/namei.c#L926

Thanks,
Amit

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