X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=Documentation%2Ffilesystems%2FLocking;h=f0f825808ca463023d815b3d38679851b55a6ff6;hb=35438c4327df18dbf5e7f597b69299119f4a14de;hp=d866551be03790c20a00b5f96c41f9226260bcfa;hpb=5884c40668a928bba017eaf54e2eb3c01c8a98e6;p=linux-2.6-omap-h63xx.git

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index d866551be03..f0f825808ca 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -510,13 +510,24 @@ More details about quota locking can be found in fs/dquot.c.
 prototypes:
 	void (*open)(struct vm_area_struct*);
 	void (*close)(struct vm_area_struct*);
+	int (*fault)(struct vm_area_struct*, struct vm_fault *);
 	struct page *(*nopage)(struct vm_area_struct*, unsigned long, int *);
+	int (*page_mkwrite)(struct vm_area_struct *, struct page *);
 
 locking rules:
-		BKL	mmap_sem
+		BKL	mmap_sem	PageLocked(page)
 open:		no	yes
 close:		no	yes
+fault:		no	yes
 nopage:		no	yes
+page_mkwrite:	no	yes		no
+
+	->page_mkwrite() is called when a previously read-only page is
+about to become writeable. The file system is responsible for
+protecting against truncate races. Once appropriate action has been
+taking to lock out truncate, the page range should be verified to be
+within i_size. The page mapping should also be checked that it is not
+NULL.
 
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 			Dubious stuff