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HWPOISON: Define a new error_remove_page address space op for async truncation

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Truncating metadata pages is not safe right now before
we haven't audited all file systems.

To enable truncation only for data address space define
a new address_space callback error_remove_page.

This is used for memory_failure.c memory error handling.

This can be then set to truncate_inode_page()

This patch just defines the new operation and adds documentation.

Callers and users come in followon patches.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Andi Kleen
2009-09-16 11:50:13 +02:00
committed by Andi Kleen
parent 83f786680a
commit 2571873621
4 changed files with 26 additions and 0 deletions
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include/linux/fs.h
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@@ -595,6 +595,7 @@ struct address_space_operations {
int (*launder_page) (struct page *);
int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
unsigned long);
int (*error_remove_page)(struct address_space *, struct page *);
};
/*