The patch titled
Subject: nfs: drop usage of folio_file_pos
has been added to the -mm mm-unstable branch. Its filename is
nfs-drop-usage-of-folio_file_pos.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nfs-drop-usage-of-folio_file_pos.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kairui Song <kasong@xxxxxxxxxxx>
Subject: nfs: drop usage of folio_file_pos
Date: Wed, 22 May 2024 01:58:49 +0800
folio_file_pos is only needed for mixed usage of page cache and swap
cache, for pure page cache usage, the caller can just use folio_pos
instead.
After commit e1209d3a7a67 ("mm: introduce ->swap_rw and use it for reads
from SWP_FS_OPS swap-space"), swap cache should never be exposed to nfs.
So remove the usage of folio_file_pos in following NFS functions / helpers:
- nfs_vm_page_mkwrite
It's only used by nfs_file_vm_ops.page_mkwrite
- trace event helper: nfs_folio_event
- trace event helper: nfs_folio_event_done
These two are used through DEFINE_NFS_FOLIO_EVENT and
DEFINE_NFS_FOLIO_EVENT_DONE, which defined following events:
- trace_nfs_aop_readpage{_done}: only called by nfs_read_folio
- trace_nfs_writeback_folio: only called by nfs_wb_folio
- trace_nfs_invalidate_folio: only called by nfs_invalidate_folio
- trace_nfs_launder_folio_done: only called by nfs_launder_folio
None of them could possibly be used on swap cache folio,
nfs_read_folio only called by:
.write_begin -> nfs_read_folio
.read_folio
nfs_wb_folio only called by nfs mapping:
.release_folio -> nfs_wb_folio
.launder_folio -> nfs_wb_folio
.write_begin -> nfs_read_folio -> nfs_wb_folio
.read_folio -> nfs_wb_folio
.write_end -> nfs_update_folio -> nfs_writepage_setup -> nfs_setup_write_request -> nfs_try_to_update_request -> nfs_wb_folio
.page_mkwrite -> nfs_update_folio -> nfs_writepage_setup -> nfs_setup_write_request -> nfs_try_to_update_request -> nfs_wb_folio
.write_begin -> nfs_flush_incompatible -> nfs_wb_folio
.page_mkwrite -> nfs_vm_page_mkwrite -> nfs_flush_incompatible -> nfs_wb_folio
nfs_invalidate_folio is only called by .invalidate_folio.
nfs_launder_folio is only called by .launder_folio
- nfs_grow_file
- nfs_update_folio
nfs_grow_file is only called by nfs_update_folio, and all
possible callers of them are:
.write_end -> nfs_update_folio
.page_mkwrite -> nfs_update_folio
- nfs_wb_folio_cancel
.invalidate_folio -> nfs_wb_folio_cancel
Also, seeing from the swap side, swap_rw is now the only interface calling
into fs, the offset info is always in iocb.ki_pos now.
So we can remove all these folio_file_pos call safely.
Link: https://lkml.kernel.org/r/20240521175854.96038-8-ryncsn@xxxxxxxxx
Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
Cc: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
Cc: Anna Schumaker <anna@xxxxxxxxxx>
Cc: Barry Song <v-songbaohua@xxxxxxxx>
Cc: Chao Yu <chao@xxxxxxxxxx>
Cc: Chris Li <chrisl@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Ilya Dryomov <idryomov@xxxxxxxxx>
Cc: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: Marc Dionne <marc.dionne@xxxxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: NeilBrown <neilb@xxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxx>
Cc: Xiubo Li <xiubli@xxxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/nfs/file.c | 2 +-
fs/nfs/nfstrace.h | 4 ++--
fs/nfs/write.c | 6 +++---
3 files changed, 6 insertions(+), 6 deletions(-)
--- a/fs/nfs/file.c~nfs-drop-usage-of-folio_file_pos
+++ a/fs/nfs/file.c
@@ -588,7 +588,7 @@ static vm_fault_t nfs_vm_page_mkwrite(st
dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
filp, filp->f_mapping->host->i_ino,
- (long long)folio_file_pos(folio));
+ (long long)folio_pos(folio));
sb_start_pagefault(inode->i_sb);
--- a/fs/nfs/nfstrace.h~nfs-drop-usage-of-folio_file_pos
+++ a/fs/nfs/nfstrace.h
@@ -960,7 +960,7 @@ DECLARE_EVENT_CLASS(nfs_folio_event,
__entry->fileid = nfsi->fileid;
__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
__entry->version = inode_peek_iversion_raw(inode);
- __entry->offset = folio_file_pos(folio);
+ __entry->offset = folio_pos(folio);
__entry->count = nfs_folio_length(folio);
),
@@ -1008,7 +1008,7 @@ DECLARE_EVENT_CLASS(nfs_folio_event_done
__entry->fileid = nfsi->fileid;
__entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
__entry->version = inode_peek_iversion_raw(inode);
- __entry->offset = folio_file_pos(folio);
+ __entry->offset = folio_pos(folio);
__entry->count = nfs_folio_length(folio);
__entry->ret = ret;
),
--- a/fs/nfs/write.c~nfs-drop-usage-of-folio_file_pos
+++ a/fs/nfs/write.c
@@ -281,7 +281,7 @@ static void nfs_grow_file(struct folio *
end_index = ((i_size - 1) >> folio_shift(folio)) << folio_order(folio);
if (i_size > 0 && folio_index(folio) < end_index)
goto out;
- end = folio_file_pos(folio) + (loff_t)offset + (loff_t)count;
+ end = folio_pos(folio) + (loff_t)offset + (loff_t)count;
if (i_size >= end)
goto out;
trace_nfs_size_grow(inode, end);
@@ -1362,7 +1362,7 @@ int nfs_update_folio(struct file *file,
nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
dprintk("NFS: nfs_update_folio(%pD2 %d@%lld)\n", file, count,
- (long long)(folio_file_pos(folio) + offset));
+ (long long)(folio_pos(folio) + offset));
if (!count)
goto out;
@@ -2073,7 +2073,7 @@ int nfs_wb_folio_cancel(struct inode *in
*/
int nfs_wb_folio(struct inode *inode, struct folio *folio)
{
- loff_t range_start = folio_file_pos(folio);
+ loff_t range_start = folio_pos(folio);
loff_t range_end = range_start + (loff_t)folio_size(folio) - 1;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_ALL,
_
Patches currently in -mm which might be from kasong@xxxxxxxxxxx are
f2fs-drop-usage-of-page_index.patch
nilfs2-drop-usage-of-page_index.patch
ceph-drop-usage-of-page_index.patch
nfs-remove-nfs_page_lengthg-and-usage-of-page_index.patch
afs-drop-usage-of-folio_file_pos.patch
netfs-drop-usage-of-folio_file_pos.patch
nfs-drop-usage-of-folio_file_pos.patch
mm-swap-get-the-swap-device-offset-directly.patch
mm-remove-page_file_offset-and-folio_file_pos.patch
mm-drop-page_index-and-simplify-folio_index.patch
mm-swap-reduce-swap-cache-search-space.patch
