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authorNick Piggin <npiggin@suse.de>2007-07-19 04:47:05 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 13:04:41 -0400
commit83c54070ee1a2d05c89793884bea1a03f2851ed4 (patch)
treedc732f5a9b93fb7004ed23f551bd98b77cc580e0 /fs/gfs2/ops_vm.c
parentd0217ac04ca6591841e5665f518e38064f4e65bd (diff)
mm: fault feedback #2
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 <npiggin@suse.de> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Bryan Wu <bryan.wu@analog.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Cc: Greg Ungerer <gerg@uclinux.org> Cc: Matthew Wilcox <willy@debian.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Chris Zankel <chris@zankel.net> Acked-by: Kyle McMartin <kyle@mcmartin.ca> Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> Acked-by: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> [ Still apparently needs some ARM and PPC loving - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/gfs2/ops_vm.c')
-rw-r--r--fs/gfs2/ops_vm.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/fs/gfs2/ops_vm.c b/fs/gfs2/ops_vm.c
index dc287d2e3a6..927d739d468 100644
--- a/fs/gfs2/ops_vm.c
+++ b/fs/gfs2/ops_vm.c
@@ -112,7 +112,7 @@ static int gfs2_sharewrite_fault(struct vm_area_struct *vma,
112 struct gfs2_holder i_gh; 112 struct gfs2_holder i_gh;
113 int alloc_required; 113 int alloc_required;
114 int error; 114 int error;
115 int ret = VM_FAULT_MINOR; 115 int ret = 0;
116 116
117 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh); 117 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
118 if (error) 118 if (error)
@@ -132,14 +132,19 @@ static int gfs2_sharewrite_fault(struct vm_area_struct *vma,
132 set_bit(GFF_EXLOCK, &gf->f_flags); 132 set_bit(GFF_EXLOCK, &gf->f_flags);
133 ret = filemap_fault(vma, vmf); 133 ret = filemap_fault(vma, vmf);
134 clear_bit(GFF_EXLOCK, &gf->f_flags); 134 clear_bit(GFF_EXLOCK, &gf->f_flags);
135 if (ret & (VM_FAULT_ERROR | FAULT_RET_NOPAGE)) 135 if (ret & VM_FAULT_ERROR)
136 goto out_unlock; 136 goto out_unlock;
137 137
138 if (alloc_required) { 138 if (alloc_required) {
139 /* XXX: do we need to drop page lock around alloc_page_backing?*/ 139 /* XXX: do we need to drop page lock around alloc_page_backing?*/
140 error = alloc_page_backing(ip, vmf->page); 140 error = alloc_page_backing(ip, vmf->page);
141 if (error) { 141 if (error) {
142 if (ret & FAULT_RET_LOCKED) 142 /*
143 * VM_FAULT_LOCKED should always be the case for
144 * filemap_fault, but it may not be in a future
145 * implementation.
146 */
147 if (ret & VM_FAULT_LOCKED)
143 unlock_page(vmf->page); 148 unlock_page(vmf->page);
144 page_cache_release(vmf->page); 149 page_cache_release(vmf->page);
145 ret = VM_FAULT_OOM; 150 ret = VM_FAULT_OOM;