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authorLinus Torvalds <torvalds@linux-foundation.org>2010-12-01 13:35:19 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-12-02 09:55:21 -0500
commit6072d13c429373c5d63b69dadbbef40a9b035552 (patch)
treea2bf745efaa4092f2a8d7d9a9b160c2a7a3b303f /mm
parent0aded708d125a3ff7e5abaea9c2d9c6d7ebbfdcd (diff)
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Call the filesystem back whenever a page is removed from the page cache
NFS needs to be able to release objects that are stored in the page cache once the page itself is no longer visible from the page cache. This patch adds a callback to the address space operations that allows filesystems to perform page cleanups once the page has been removed from the page cache. Original patch by: Linus Torvalds <torvalds@linux-foundation.org> [trondmy: cover the cases of invalidate_inode_pages2() and truncate_inode_pages()] Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c5
-rw-r--r--mm/truncate.c4
-rw-r--r--mm/vmscan.c7
3 files changed, 16 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index ea89840fc65f..6b9aee20f242 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -143,13 +143,18 @@ void __remove_from_page_cache(struct page *page)
void remove_from_page_cache(struct page *page)
{
struct address_space *mapping = page->mapping;
+ void (*freepage)(struct page *);
BUG_ON(!PageLocked(page));
+ freepage = mapping->a_ops->freepage;
spin_lock_irq(&mapping->tree_lock);
__remove_from_page_cache(page);
spin_unlock_irq(&mapping->tree_lock);
mem_cgroup_uncharge_cache_page(page);
+
+ if (freepage)
+ freepage(page);
}
EXPORT_SYMBOL(remove_from_page_cache);
diff --git a/mm/truncate.c b/mm/truncate.c
index ba887bff48c5..3c2d5ddfa0d4 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -390,6 +390,10 @@ invalidate_complete_page2(struct address_space *mapping, struct page *page)
__remove_from_page_cache(page);
spin_unlock_irq(&mapping->tree_lock);
mem_cgroup_uncharge_cache_page(page);
+
+ if (mapping->a_ops->freepage)
+ mapping->a_ops->freepage(page);
+
page_cache_release(page); /* pagecache ref */
return 1;
failed:
diff --git a/mm/vmscan.c b/mm/vmscan.c
index d31d7ce52c0e..9ca587c69274 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -494,9 +494,16 @@ static int __remove_mapping(struct address_space *mapping, struct page *page)
spin_unlock_irq(&mapping->tree_lock);
swapcache_free(swap, page);
} else {
+ void (*freepage)(struct page *);
+
+ freepage = mapping->a_ops->freepage;
+
__remove_from_page_cache(page);
spin_unlock_irq(&mapping->tree_lock);
mem_cgroup_uncharge_cache_page(page);
+
+ if (freepage != NULL)
+ freepage(page);
}
return 1;