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linux/fs/gfs2
Nick Piggin 54cb8821de mm: merge populate and nopage into fault (fixes nonlinear)
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 <npiggin@suse.de>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-19 10:04:41 -07:00
..
locking [GFS2] return conflicts for GETLK 2007-07-09 08:23:33 +01:00
acl.c Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check 2007-07-17 12:00:03 -07:00
acl.h
bmap.c [GFS2] Fix gfs2_block_truncate_page err return 2007-07-09 08:23:54 +01:00
bmap.h
daemon.c [GFS2] System won't suspend with GFS2 file system mounted 2007-07-09 08:24:04 +01:00
daemon.h
dir.c [GFS2] Obtaining no_formal_ino from directory entry 2007-07-09 08:24:08 +01:00
dir.h [GFS2] Clean up inode number handling 2007-07-09 08:22:24 +01:00
eaops.c Remove capability.h from mm.h 2007-07-16 09:05:45 -07:00
eaops.h
eattr.c [GFS2] Add nanosecond timestamp feature 2007-07-09 08:23:12 +01:00
eattr.h
gfs2.h
glock.c [GFS2] Simplify multiple glock aquisition 2007-07-09 08:23:50 +01:00
glock.h [GFS2] Fix deallocation issues 2007-07-09 08:23:36 +01:00
glops.c [GFS2] flush the glock completely in inode_go_sync 2007-07-09 08:22:07 +01:00
glops.h
incore.h [GFS2] assertion failure after writing to journaled file, umount 2007-07-09 08:23:47 +01:00
inode.c [GFS2] Remove i_mode passing from NFS File Handle 2007-07-09 08:24:11 +01:00
inode.h [GFS2] Remove i_mode passing from NFS File Handle 2007-07-09 08:24:11 +01:00
Kconfig [DLM/GFS2] indent help text 2007-02-05 13:38:20 -05:00
lm.c [PATCH] remove many unneeded #includes of sched.h 2007-02-14 08:09:54 -08:00
lm.h
locking.c
log.c [GFS2] Small fixes to logging code 2007-07-09 15:43:07 +01:00
log.h
lops.c [GFS2] Addendum to the journaled file/unmount patch 2007-07-09 08:23:52 +01:00
lops.h [GFS2] assertion failure after writing to journaled file, umount 2007-07-09 08:23:47 +01:00
main.c Remove SLAB_CTOR_CONSTRUCTOR 2007-05-17 05:23:04 -07:00
Makefile [GFS2] Fix sign problem in quota/statfs and cleanup _host structures 2007-07-09 08:23:10 +01:00
meta_io.c [GFS2] assertion failure after writing to journaled file, umount 2007-07-09 08:23:47 +01:00
meta_io.h [GFS2] Clean up inode number handling 2007-07-09 08:22:24 +01:00
mount.c [GFS2] remounting w/o acl option leaves acls enabled 2007-07-09 08:24:01 +01:00
mount.h
ops_address.c mm: merge populate and nopage into fault (fixes nonlinear) 2007-07-19 10:04:41 -07:00
ops_address.h [GFS2] Addendum patch 2 for gfs2_grow 2007-07-09 08:22:19 +01:00
ops_dentry.c [GFS2] Clean up inode number handling 2007-07-09 08:22:24 +01:00
ops_dentry.h
ops_export.c knfsd: exportfs: add exportfs.h header 2007-07-17 10:23:06 -07:00
ops_file.c mm: merge populate and nopage into fault (fixes nonlinear) 2007-07-19 10:04:41 -07:00
ops_file.h
ops_fstype.c [GFS2] Obtaining no_formal_ino from directory entry 2007-07-09 08:24:08 +01:00
ops_fstype.h [GFS2] Fix sign problem in quota/statfs and cleanup _host structures 2007-07-09 08:23:10 +01:00
ops_inode.c [GFS2] inode size inconsistency 2007-07-09 08:23:59 +01:00
ops_inode.h [PATCH] mark struct inode_operations const 2 2007-02-12 09:48:46 -08:00
ops_super.c [GFS2] Fix deallocation issues 2007-07-09 08:23:36 +01:00
ops_super.h [PATCH] Mark struct super_operations const 2007-02-12 09:48:47 -08:00
ops_vm.c mm: merge populate and nopage into fault (fixes nonlinear) 2007-07-19 10:04:41 -07:00
ops_vm.h
quota.c [GFS2] Fix sign problem in quota/statfs and cleanup _host structures 2007-07-09 08:23:10 +01:00
quota.h
recovery.c [GFS2] Fix sign problem in quota/statfs and cleanup _host structures 2007-07-09 08:23:10 +01:00
recovery.h
rgrp.c [GFS2] Remove i_mode passing from NFS File Handle 2007-07-09 08:24:11 +01:00
rgrp.h [GFS2] Addendum patch 2 for gfs2_grow 2007-07-09 08:22:19 +01:00
super.c [GFS2] Fix sign problem in quota/statfs and cleanup _host structures 2007-07-09 08:23:10 +01:00
super.h [GFS2] Fix sign problem in quota/statfs and cleanup _host structures 2007-07-09 08:23:10 +01:00
sys.c remove "struct subsystem" as it is no longer needed 2007-05-02 18:57:59 -07:00
sys.h
trans.c
trans.h
util.c [GFS2] Fix sign problem in quota/statfs and cleanup _host structures 2007-07-09 08:23:10 +01:00
util.h