The patch titled
Document ->page_mkwrite() locking
has been removed from the -mm tree. Its filename was
document-page_mkwrite-locking.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: Document ->page_mkwrite() locking
From: Mark Fasheh <mark.fasheh@xxxxxxxxxx>
There seems to be very little documentation about this callback in general.
The locking in particular is a bit tricky, so it's worth having this in
writing.
Signed-off-by: Mark Fasheh <mark.fasheh@xxxxxxxxxx>
Cc: Nick Piggin <nickpiggin@xxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/Locking | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff -puN Documentation/filesystems/Locking~document-page_mkwrite-locking Documentation/filesystems/Locking
--- a/Documentation/filesystems/Locking~document-page_mkwrite-locking
+++ a/Documentation/filesystems/Locking
@@ -512,13 +512,22 @@ prototypes:
void (*close)(struct vm_area_struct*);
struct page *(*fault)(struct vm_area_struct*, struct fault_data *);
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.
================================================================================
Dubious stuff
_
Patches currently in -mm which might be from mark.fasheh@xxxxxxxxxx are
origin.patch
git-ocfs2.patch
fs-introduce-write_begin-write_end-and-perform_write-aops.patch
ext3-convert-to-new-aops-fix.patch
ext4-convert-to-new-aops-fix.patch
ocfs2-convert-to-new-aops.patch
fs-remove-some-aop_truncated_page.patch
-
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