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documentation: update address_space_operations 

The documentation for address_space_operations is partially out of date.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2013-07-03 15:04:45 -07:00 committed by Linus Torvalds
parent 55878e88c5
commit 26c0c5bf38
1 changed files with 7 additions and 8 deletions
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15
Documentation/filesystems/vfs.txt
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@ -559,7 +559,6 @@ your filesystem. The following members are defined:
struct address_space_operations {
int (*writepage)(struct page *page, struct writeback_control *wbc);
int (*readpage)(struct file *, struct page *);
int (*sync_page)(struct page *);
int (*writepages)(struct address_space *, struct writeback_control *);
int (*set_page_dirty)(struct page *page);
int (*readpages)(struct file *filp, struct address_space *mapping,
@ -581,6 +580,8 @@ struct address_space_operations {
/* migrate the contents of a page to the specified target */
int (*migratepage) (struct page *, struct page *);
int (*launder_page) (struct page *);
int (*is_partially_uptodate) (struct page *, read_descriptor_t *,
unsigned long);
int (*error_remove_page) (struct mapping *mapping, struct page *page);
int (*swap_activate)(struct file *);
int (*swap_deactivate)(struct file *);
@ -612,13 +613,6 @@ struct address_space_operations {
In this case, the page will be relocated, relocked and if
that all succeeds, ->readpage will be called again.
sync_page: called by the VM to notify the backing store to perform all
queued I/O operations for a page. I/O operations for other pages
associated with this address_space object may also be performed.
This function is optional and is called only for pages with
PG_Writeback set while waiting for the writeback to complete.
writepages: called by the VM to write out pages associated with the
address_space object. If wbc->sync_mode is WBC_SYNC_ALL, then
the writeback_control will specify a range of pages that must be
@ -747,6 +741,11 @@ struct address_space_operations {
prevent redirtying the page, it is kept locked during the whole
operation.
is_partially_uptodate: Called by the VM when reading a file through the
pagecache when the underlying blocksize != pagesize. If the required
block is up to date then the read can complete without needing the IO
to bring the whole page up to date.
error_remove_page: normally set to generic_error_remove_page if truncation
is ok for this address space. Used for memory failure handling.
Setting this implies you deal with pages going away under you,