kernel-ark/fs/nfs
Christoph Lameter eebd2aa355 Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user
Simplify page cache zeroing of segments of pages through 3 functions

zero_user_segments(page, start1, end1, start2, end2)

        Zeros two segments of the page. It takes the position where to
        start and end the zeroing which avoids length calculations and
	makes code clearer.

zero_user_segment(page, start, end)

        Same for a single segment.

zero_user(page, start, length)

        Length variant for the case where we know the length.

We remove the zero_user_page macro. Issues:

1. Its a macro. Inline functions are preferable.

2. The KM_USER0 macro is only defined for HIGHMEM.

   Having to treat this special case everywhere makes the
   code needlessly complex. The parameter for zeroing is always
   KM_USER0 except in one single case that we open code.

Avoiding KM_USER0 makes a lot of code not having to be dealing
with the special casing for HIGHMEM anymore. Dealing with
kmap is only necessary for HIGHMEM configurations. In those
configurations we use KM_USER0 like we do for a series of other
functions defined in highmem.h.

Since KM_USER0 is depends on HIGHMEM the existing zero_user_page
function could not be a macro. zero_user_* functions introduced
here can be be inline because that constant is not used when these
functions are called.

Also extract the flushing of the caches to be outside of the kmap.

[akpm@linux-foundation.org: fix nfs and ntfs build]
[akpm@linux-foundation.org: fix ntfs build some more]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Steven French <sfrench@us.ibm.com>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: <linux-ext4@vger.kernel.org>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Cc: David Chinner <dgc@sgi.com>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Cc: Steven French <sfrench@us.ibm.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-05 09:44:13 -08:00
..
callback_proc.c NFSv4: Iterate through all nfs_clients when the server recalls a delegation 2008-01-30 02:06:12 -05:00
callback_xdr.c NFS: Change cb_recallargs to pass "struct sockaddr *" instead of sockaddr_in 2008-01-30 02:05:55 -05:00
callback.c svc: Change services to use new svc_create_xprt service 2008-02-01 16:42:09 -05:00
callback.h NFS: Change cb_recallargs to pass "struct sockaddr *" instead of sockaddr_in 2008-01-30 02:05:55 -05:00
client.c Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-01 11:45:47 +11:00
delegation.c NFSv4: Deal more correctly with duplicate delegations 2008-01-30 02:06:12 -05:00
delegation.h NFS: Add an asynchronous delegreturn operation for use in nfs_clear_inode 2008-01-30 02:06:12 -05:00
dir.c NFS: Fix a potential race between umount and nfs_access_cache_shrinker() 2008-01-30 02:06:12 -05:00
direct.c Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-01 11:45:47 +11:00
file.c NFS: nfs_write_end clean up 2008-01-30 02:06:02 -05:00
getroot.c NFS: Fix an Oops in NFS unmount 2007-12-12 11:12:15 -05:00
idmap.c NFS: Use size_t for storing name lengths 2008-01-30 02:06:01 -05:00
inode.c Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-01 11:45:47 +11:00
internal.h NFSv4: Iterate through all nfs_clients when the server recalls a delegation 2008-01-30 02:06:12 -05:00
iostat.h NFSv4: Fix an oops in nfs4_fill_super 2006-03-20 13:44:48 -05:00
Makefile [NFS] [PATCH] nfs: tiny makefile cleanup 2007-10-09 17:15:36 -04:00
mount_clnt.c NFS: Switch from intr mount option to TASK_KILLABLE 2007-12-06 17:40:25 -05:00
namespace.c NFS: Remove the redundant nfs_client->cl_nfsversion 2008-01-30 02:05:49 -05:00
nfs2xdr.c NFS: Use unsigned intermediates for manipulating header lengths (NFSv2 XDR) 2008-01-30 02:05:44 -05:00
nfs3acl.c NFS: Remove nfs_begin_data_update/nfs_end_data_update 2007-10-09 17:19:53 -04:00
nfs3proc.c Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-01 11:45:47 +11:00
nfs3xdr.c NFS: Use unsigned intermediates for manipulating header lengths (NFSv3 XDR) 2008-01-30 02:05:44 -05:00
nfs4_fs.h NFSv4: Give the lock stateid its own sequence queue 2008-01-10 13:35:32 -08:00
nfs4namespace.c NFS: Adjust nfs_clone_mount structure to store "struct sockaddr *" 2008-01-30 02:05:56 -05:00
nfs4proc.c Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-01 11:45:47 +11:00
nfs4renewd.c NFSv4: Fix circular locking dependency in nfs4_kill_renewd 2008-01-03 09:37:16 -05:00
nfs4state.c NFS: eliminate NIPQUAD(clp->cl_addr.sin_addr) 2008-01-30 02:05:52 -05:00
nfs4xdr.c NFS: Ensure NFSv4 SETCLIENTID send buffer is large enough 2008-01-30 02:05:51 -05:00
nfsroot.c NFS: Switch from intr mount option to TASK_KILLABLE 2007-12-06 17:40:25 -05:00
pagelist.c Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-01 11:45:47 +11:00
proc.c NLM/NFS: Use cached nlm_host when calling nlmclnt_proc() 2008-01-30 02:06:07 -05:00
read.c Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user 2008-02-05 09:44:13 -08:00
super.c Merge branch 'task_killable' of git://git.kernel.org/pub/scm/linux/kernel/git/willy/misc 2008-02-01 11:45:47 +11:00
symlink.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
sysctl.c [PATCH] nfs: fix congestion control 2007-03-16 19:25:05 -07:00
unlink.c NFS/SUNRPC: Convert all users of rpc_call_setup() 2008-01-30 02:05:32 -05:00
write.c Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user 2008-02-05 09:44:13 -08:00