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authorAndrew Morton <akpm@osdl.org>2006-10-17 00:09:36 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-17 08:18:43 -0700
commita649fd9271773dd0f78e2b9f347bcceecb8827f9 (patch)
tree59b29ffef77a2c5cce233393848c13354f02c0f2
parent5eb30790d4ccd3409240a80eaf9ab76b4fb75fd8 (diff)
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[PATCH] invalidate: remove_mapping() fix
If remove_mapping() failed to remove the page from its mapping, don't go and mark it not uptodate! Makes kernel go dead. (Actually, I don't think the ClearPageUptodate is needed there at all). Says Nick Piggin: "Right, it isn't needed because at this point the page is guaranteed by remove_mapping to have no references (except us) and cannot pick up any new ones because it is removed from pagecache. We can delete it." Signed-off-by: Andrew Morton <akpm@osdl.org> Acked-by: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--mm/truncate.c1
-rw-r--r--mm/vmscan.c6
2 files changed, 6 insertions, 1 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 11ca480701d..e07b1e682c3 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -96,7 +96,6 @@ invalidate_complete_page(struct address_space *mapping, struct page *page)
return 0;
ret = remove_mapping(mapping, page);
- ClearPageUptodate(page);
return ret;
}
diff --git a/mm/vmscan.c b/mm/vmscan.c
index eca70310adb..af73c14f9d8 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -378,6 +378,12 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
return PAGE_CLEAN;
}
+/*
+ * Attempt to detach a locked page from its ->mapping. If it is dirty or if
+ * someone else has a ref on the page, abort and return 0. If it was
+ * successfully detached, return 1. Assumes the caller has a single ref on
+ * this page.
+ */
int remove_mapping(struct address_space *mapping, struct page *page)
{
BUG_ON(!PageLocked(page));