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Commit 6b9b3514 authored by David Howells's avatar David Howells
Browse files

NFS: Add comment banners to some NFS functions 



Add comment banners to some NFS functions so that they can be modified by the
NFS fscache patches for further information.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Acked-by: default avatarSteve Dickson <steved@redhat.com>
Acked-by: default avatarTrond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Tested-by: default avatarDaire Byrne <Daire.Byrne@framestore.com>
parent 9b3f26c9

fs/nfs/file.c

+26 −0
Original line number Diff line number Diff line
@@ -409,6 +409,13 @@ static int nfs_write_end(struct file *file, struct address_space *mapping, 
	return copied;

}



/*

 * Partially or wholly invalidate a page

 * - Release the private state associated with a page if undergoing complete

 *   page invalidation

 * - Called if either PG_private or PG_private_2 is set on the page

 * - Caller holds page lock

 */

static void nfs_invalidate_page(struct page *page, unsigned long offset)

{

	dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
@@ -419,6 +426,12 @@ static void nfs_invalidate_page(struct page *page, unsigned long offset) 
	nfs_wb_page_cancel(page->mapping->host, page);

}



/*

 * Attempt to release the private state associated with a page

 * - Called if either PG_private or PG_private_2 is set on the page

 * - Caller holds page lock

 * - Return true (may release page) or false (may not)

 */

static int nfs_release_page(struct page *page, gfp_t gfp)

{

	dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
@@ -427,6 +440,14 @@ static int nfs_release_page(struct page *page, gfp_t gfp) 
	return 0;

}



/*

 * Attempt to clear the private state associated with a page when an error

 * occurs that requires the cached contents of an inode to be written back or

 * destroyed

 * - Called if either PG_private or PG_private_2 is set on the page

 * - Caller holds page lock

 * - Return 0 if successful, -error otherwise

 */

static int nfs_launder_page(struct page *page)

{

	struct inode *inode = page->mapping->host;
@@ -451,6 +472,11 @@ const struct address_space_operations nfs_file_aops = { 
	.launder_page = nfs_launder_page,

};



/*

 * Notification that a PTE pointing to an NFS page is about to be made

 * writable, implying that someone is about to modify the page through a

 * shared-writable mapping

 */

static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)

{

	struct page *page = vmf->page;