A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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Call the filesystem back whenever a page is removed from the page cache

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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 <[email protected]>
[trondmy: cover the cases of invalidate_inode_pages2() and
          truncate_inode_pages()]
Signed-off-by: Trond Myklebust <[email protected]>
This commit is contained in:
Linus Torvalds 2010-12-01 13:35:19 -05:00 • committed by Trond Myklebust
commit 6072d13c42
6 changed files with 30 additions and 1 deletions
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5
mm/filemap.c
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@ -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);