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authorNick Piggin <npiggin@suse.de>2006-03-31 02:29:56 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:18:49 -0800
commit93fac7041f082297b93655a0e49f659cd7520e40 (patch)
tree2d8f295087377d4ac0ceea49dd67bb682b04c749
parent9bf9e89c3d147ca8cf9622d2d053684fba77a464 (diff)
downloadlinux-93fac7041f082297b93655a0e49f659cd7520e40.tar.bz2
[PATCH] mm: schedule find_trylock_page() removal
find_trylock_page() is an odd interface in that it doesn't take a reference like the others. Now that XFS no longer uses it, and its last remaining caller actually wants an elevated refcount, opencode that callsite and schedule find_trylock_page() for removal. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--Documentation/feature-removal-schedule.txt12
-rw-r--r--include/linux/pagemap.h4
-rw-r--r--mm/swapfile.c14
3 files changed, 24 insertions, 6 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index 495858b236b6..a92b10bb0b03 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -241,3 +241,15 @@ Why: The USB subsystem has changed a lot over time, and it has been
Who: Greg Kroah-Hartman <gregkh@suse.de>
---------------------------
+
+What: find_trylock_page
+When: January 2007
+Why: The interface no longer has any callers left in the kernel. It
+ is an odd interface (compared with other find_*_page functions), in
+ that it does not take a refcount to the page, only the page lock.
+ It should be replaced with find_get_page or find_lock_page if possible.
+ This feature removal can be reevaluated if users of the interface
+ cannot cleanly use something else.
+Who: Nick Piggin <npiggin@suse.de>
+
+---------------------------
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 839f0b3c23aa..9539efd4f7e6 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -72,8 +72,8 @@ extern struct page * find_get_page(struct address_space *mapping,
unsigned long index);
extern struct page * find_lock_page(struct address_space *mapping,
unsigned long index);
-extern struct page * find_trylock_page(struct address_space *mapping,
- unsigned long index);
+extern __deprecated_for_modules struct page * find_trylock_page(
+ struct address_space *mapping, unsigned long index);
extern struct page * find_or_create_page(struct address_space *mapping,
unsigned long index, gfp_t gfp_mask);
unsigned find_get_pages(struct address_space *mapping, pgoff_t start,
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 39aa9d129612..e5fd5385f0cc 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -397,18 +397,24 @@ void free_swap_and_cache(swp_entry_t entry)
p = swap_info_get(entry);
if (p) {
- if (swap_entry_free(p, swp_offset(entry)) == 1)
- page = find_trylock_page(&swapper_space, entry.val);
+ if (swap_entry_free(p, swp_offset(entry)) == 1) {
+ page = find_get_page(&swapper_space, entry.val);
+ if (page && unlikely(TestSetPageLocked(page))) {
+ page_cache_release(page);
+ page = NULL;
+ }
+ }
spin_unlock(&swap_lock);
}
if (page) {
int one_user;
BUG_ON(PagePrivate(page));
- page_cache_get(page);
one_user = (page_count(page) == 2);
/* Only cache user (+us), or swap space full? Free it! */
- if (!PageWriteback(page) && (one_user || vm_swap_full())) {
+ /* Also recheck PageSwapCache after page is locked (above) */
+ if (PageSwapCache(page) && !PageWriteback(page) &&
+ (one_user || vm_swap_full())) {
delete_from_swap_cache(page);
SetPageDirty(page);
}