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authorAndi Kleen <andi@firstfloor.org>2009-09-16 05:50:13 -0400
committerAndi Kleen <ak@linux.intel.com>2009-09-16 05:50:13 -0400
commit257187362123f15d9d1e09918cf87cebbea4e786 (patch)
tree92b768ad3f2afeda13a2acadc6d5766090ebcc60 /Documentation/filesystems/vfs.txt
parent83f786680aec8d030184f7ced1a0a3dd8ac81764 (diff)
HWPOISON: Define a new error_remove_page address space op for async truncation
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>
Diffstat (limited to 'Documentation/filesystems/vfs.txt')
-rw-r--r--Documentation/filesystems/vfs.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index f49eecf2e573..623f094c9d8d 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -536,6 +536,7 @@ struct address_space_operations {
536 /* migrate the contents of a page to the specified target */ 536 /* migrate the contents of a page to the specified target */
537 int (*migratepage) (struct page *, struct page *); 537 int (*migratepage) (struct page *, struct page *);
538 int (*launder_page) (struct page *); 538 int (*launder_page) (struct page *);
539 int (*error_remove_page) (struct mapping *mapping, struct page *page);
539}; 540};
540 541
541 writepage: called by the VM to write a dirty page to backing store. 542 writepage: called by the VM to write a dirty page to backing store.
@@ -694,6 +695,12 @@ struct address_space_operations {
694 prevent redirtying the page, it is kept locked during the whole 695 prevent redirtying the page, it is kept locked during the whole
695 operation. 696 operation.
696 697
698 error_remove_page: normally set to generic_error_remove_page if truncation
699 is ok for this address space. Used for memory failure handling.
700 Setting this implies you deal with pages going away under you,
701 unless you have them locked or reference counts increased.
702
703
697The File Object 704The File Object
698=============== 705===============
699 706