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-rw-r--r--Documentation/filesystems/vfs.txt20
1 files changed, 10 insertions, 10 deletions
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index bc4b06b3160a..e445b95a002b 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -549,7 +549,7 @@ struct address_space_operations
-------------------------------
This describes how the VFS can manipulate mapping of a file to page cache in
-your filesystem. As of kernel 2.6.22, the following members are defined:
+your filesystem. The following members are defined:
struct address_space_operations {
int (*writepage)(struct page *page, struct writeback_control *wbc);
@@ -566,7 +566,7 @@ struct address_space_operations {
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata);
sector_t (*bmap)(struct address_space *, sector_t);
- int (*invalidatepage) (struct page *, unsigned long);
+ void (*invalidatepage) (struct page *, unsigned int, unsigned int);
int (*releasepage) (struct page *, int);
void (*freepage)(struct page *);
ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
@@ -685,14 +685,14 @@ struct address_space_operations {
invalidatepage: If a page has PagePrivate set, then invalidatepage
will be called when part or all of the page is to be removed
from the address space. This generally corresponds to either a
- truncation or a complete invalidation of the address space
- (in the latter case 'offset' will always be 0).
- Any private data associated with the page should be updated
- to reflect this truncation. If offset is 0, then
- the private data should be released, because the page
- must be able to be completely discarded. This may be done by
- calling the ->releasepage function, but in this case the
- release MUST succeed.
+ truncation, punch hole or a complete invalidation of the address
+ space (in the latter case 'offset' will always be 0 and 'length'
+ will be PAGE_CACHE_SIZE). Any private data associated with the page
+ should be updated to reflect this truncation. If offset is 0 and
+ length is PAGE_CACHE_SIZE, then the private data should be released,
+ because the page must be able to be completely discarded. This may
+ be done by calling the ->releasepage function, but in this case the
+ release MUST succeed.
releasepage: releasepage is called on PagePrivate pages to indicate
that the page should be freed if possible. ->releasepage