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mm: remove page_file_offset and folio_file_pos

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These two helpers were useful for mixed usage of swap cache and page
cache, which help retrieve the corresponding file or swap device offset of
a page or folio.

They were introduced in commit f981c5950f ("mm: methods for teaching
filesystems about PG_swapcache pages") and used in commit d56b4ddf77
("nfs: teach the NFS client how to treat PG_swapcache pages"), suppose to
be used with direct_IO for swap over fs.

But after commit e1209d3a7a ("mm: introduce ->swap_rw and use it for
reads from SWP_FS_OPS swap-space"), swap with direct_IO is no more, and
swap cache mapping is never exposed to fs.

Now we have dropped all users of page_file_offset and folio_file_pos, so
they can be deleted.

Link: https://lkml.kernel.org/r/20240521175854.96038-10-ryncsn@gmail.com
Signed-off-by: Kairui Song <kasong@tencent.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Cc: Anna Schumaker <anna@kernel.org>
Cc: Barry Song <v-songbaohua@oppo.com>
Cc: Chao Yu <chao@kernel.org>
Cc: Chris Li <chrisl@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Jeff Layton <jlayton@kernel.org>
Cc: Marc Dionne <marc.dionne@auristor.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: NeilBrown <neilb@suse.de>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Xiubo Li <xiubli@redhat.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kairui Song 2024-05-22 01:58:51 +08:00 committed by Andrew Morton
parent 545ebe71d3
commit 564a2ee9f9
1 changed files with 0 additions and 17 deletions
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17
include/linux/pagemap.h
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@ -932,11 +932,6 @@ static inline loff_t page_offset(struct page *page)
return ((loff_t)page->index) << PAGE_SHIFT;
}
static inline loff_t page_file_offset(struct page *page)
{
return ((loff_t)page_index(page)) << PAGE_SHIFT;
}
/**
* folio_pos - Returns the byte position of this folio in its file.
* @folio: The folio.
@ -946,18 +941,6 @@ static inline loff_t folio_pos(struct folio *folio)
return page_offset(&folio->page);
}
/**
* folio_file_pos - Returns the byte position of this folio in its file.
* @folio: The folio.
*
* This differs from folio_pos() for folios which belong to a swap file.
* NFS is the only filesystem today which needs to use folio_file_pos().
*/
static inline loff_t folio_file_pos(struct folio *folio)
{
return page_file_offset(&folio->page);
}
/*
* Get the offset in PAGE_SIZE (even for hugetlb folios).
*/