linux.git/mm/filemap.c, branch v2.6.23

fix page release issue in filemap_fault

2007-10-08T19:58:14+00:00

find_lock_page increases page's usage count, we should decrease it
before return VM_FAULT_SIGBUS

Signed-off-by: Yan Zheng
Cc: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

2007-08-11T23:01:06+00:00

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  BLOCK: Hide the contents of linux/bio.h if CONFIG_BLOCK=n
  sysace: HDIO_GETGEO has it's own method for ages
  drivers/block/cpqarray.c: better error handling and kmalloc + memset conversion to k[cz]alloc
  drivers/block/cciss.c: kmalloc + memset conversion to kzalloc
  Clean up duplicate includes in drivers/block/
  Fix remap handling by blktrace
  [PATCH] remove mm/filemap.c:file_send_actor()

readahead: docbook fix

2007-08-11T22:47:42+00:00

Minor docbook error since argument name in comment doesn't match function

Signed-off-by: Stephen Hemminger 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] remove mm/filemap.c:file_send_actor()

2007-08-11T20:34:47+00:00

This patch removes the no longer used file_send_actor().

Signed-off-by: Adrian Bunk 
Signed-off-by: Jens Axboe

fix filemap.c kernel-doc

2007-07-31T22:39:38+00:00

Fix kernel-doc warning:
Warning(linux-2.6.23-rc1-mm1//mm/filemap.c:864): No description found for parameter 'ra'

Signed-off-by: Randy Dunlap 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

readahead: split ondemand readahead interface into two functions

2007-07-19T17:04:44+00:00

Split ondemand readahead interface into two functions.  I think this makes it
a little clearer for non-readahead experts (like Rusty).

Internally they both call ondemand_readahead(), but the page argument is
changed to an obvious boolean flag.

Signed-off-by: Rusty Russell 
Signed-off-by: Fengguang Wu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

readahead: convert filemap invocations

2007-07-19T17:04:44+00:00

Convert filemap reads to use on-demand readahead.

The new call scheme is to
- call readahead on non-cached page
- call readahead on look-ahead page
- update prev_index when finished with the read request

Signed-off-by: Fengguang Wu 
Cc: Steven Pratt 
Cc: Ram Pai 
Cc: Rusty Russell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: fault feedback #2

2007-07-19T17:04:41+00:00

This patch completes Linus's wish that the fault return codes be made into
bit flags, which I agree makes everything nicer.  This requires requires
all handle_mm_fault callers to be modified (possibly the modifications
should go further and do things like fault accounting in handle_mm_fault --
however that would be for another patch).

[akpm@linux-foundation.org: fix alpha build]
[akpm@linux-foundation.org: fix s390 build]
[akpm@linux-foundation.org: fix sparc build]
[akpm@linux-foundation.org: fix sparc64 build]
[akpm@linux-foundation.org: fix ia64 build]
Signed-off-by: Nick Piggin 
Cc: Richard Henderson 
Cc: Ivan Kokshaysky 
Cc: Russell King 
Cc: Ian Molton 
Cc: Bryan Wu 
Cc: Mikael Starvik 
Cc: David Howells 
Cc: Yoshinori Sato 
Cc: "Luck, Tony" 
Cc: Hirokazu Takata 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: Greg Ungerer 
Cc: Matthew Wilcox 
Cc: Paul Mackerras 
Cc: Benjamin Herrenschmidt 
Cc: Heiko Carstens 
Cc: Martin Schwidefsky 
Cc: Paul Mundt 
Cc: Kazumoto Kojima 
Cc: Richard Curnow 
Cc: William Lee Irwin III 
Cc: "David S. Miller" 
Cc: Jeff Dike 
Cc: Paolo 'Blaisorblade' Giarrusso 
Cc: Miles Bader 
Cc: Chris Zankel 
Acked-by: Kyle McMartin 
Acked-by: Haavard Skinnemoen 
Acked-by: Ralf Baechle 
Acked-by: Andi Kleen 
Signed-off-by: Andrew Morton 
[ Still apparently needs some ARM and PPC loving - Linus ]
Signed-off-by: Linus Torvalds

mm: fault feedback #1

2007-07-19T17:04:41+00:00

Change ->fault prototype.  We now return an int, which contains
VM_FAULT_xxx code in the low byte, and FAULT_RET_xxx code in the next byte.
 FAULT_RET_ code tells the VM whether a page was found, whether it has been
locked, and potentially other things.  This is not quite the way he wanted
it yet, but that's changed in the next patch (which requires changes to
arch code).

This means we no longer set VM_CAN_INVALIDATE in the vma in order to say
that a page is locked which requires filemap_nopage to go away (because we
can no longer remain backward compatible without that flag), but we were
going to do that anyway.

struct fault_data is renamed to struct vm_fault as Linus asked. address
is now a void __user * that we should firmly encourage drivers not to use
without really good reason.

The page is now returned via a page pointer in the vm_fault struct.

Signed-off-by: Nick Piggin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: merge populate and nopage into fault (fixes nonlinear)

2007-07-19T17:04:41+00:00

Nonlinear mappings are (AFAIKS) simply a virtual memory concept that encodes
the virtual address -> file offset differently from linear mappings.

->populate is a layering violation because the filesystem/pagecache code
should need to know anything about the virtual memory mapping.  The hitch here
is that the ->nopage handler didn't pass down enough information (ie.  pgoff).
 But it is more logical to pass pgoff rather than have the ->nopage function
calculate it itself anyway (because that's a similar layering violation).

Having the populate handler install the pte itself is likewise a nasty thing
to be doing.

This patch introduces a new fault handler that replaces ->nopage and
->populate and (later) ->nopfn.  Most of the old mechanism is still in place
so there is a lot of duplication and nice cleanups that can be removed if
everyone switches over.

The rationale for doing this in the first place is that nonlinear mappings are
subject to the pagefault vs invalidate/truncate race too, and it seemed stupid
to duplicate the synchronisation logic rather than just consolidate the two.

After this patch, MAP_NONBLOCK no longer sets up ptes for pages present in
pagecache.  Seems like a fringe functionality anyway.

NOPAGE_REFAULT is removed.  This should be implemented with ->fault, and no
users have hit mainline yet.

[akpm@linux-foundation.org: cleanup]
[randy.dunlap@oracle.com: doc. fixes for readahead]
[akpm@linux-foundation.org: build fix]
Signed-off-by: Nick Piggin 
Signed-off-by: Randy Dunlap 
Cc: Mark Fasheh 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds