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authorNick Piggin <npiggin@suse.de>2007-07-19 04:47:03 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 13:04:41 -0400
commitd0217ac04ca6591841e5665f518e38064f4e65bd (patch)
treed3309094bb734d34773f97d642593e298a5cfcfc /Documentation/filesystems/Locking
parented2f2f9b3ff8debdf512f7687b232c3c1d7d60d7 (diff)
mm: fault feedback #1
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 <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/filesystems/Locking')
-rw-r--r--Documentation/filesystems/Locking2
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 91ec4b40ebfe..f0f825808ca4 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -510,7 +510,7 @@ More details about quota locking can be found in fs/dquot.c.
510prototypes: 510prototypes:
511 void (*open)(struct vm_area_struct*); 511 void (*open)(struct vm_area_struct*);
512 void (*close)(struct vm_area_struct*); 512 void (*close)(struct vm_area_struct*);
513 struct page *(*fault)(struct vm_area_struct*, struct fault_data *); 513 int (*fault)(struct vm_area_struct*, struct vm_fault *);
514 struct page *(*nopage)(struct vm_area_struct*, unsigned long, int *); 514 struct page *(*nopage)(struct vm_area_struct*, unsigned long, int *);
515 int (*page_mkwrite)(struct vm_area_struct *, struct page *); 515 int (*page_mkwrite)(struct vm_area_struct *, struct page *);
516 516