[merged mm-stable] jbd2-use-a-folio-in-jbd2_journal_write_metadata_buffer.patch removed from -mm tree

[merged mm-stable] jbd2-use-a-folio-in-jbd2_journal_write_metadata_buffer.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: jbd2: use a folio in jbd2_journal_write_metadata_buffer()
has been removed from the -mm tree.  Its filename was
     jbd2-use-a-folio-in-jbd2_journal_write_metadata_buffer.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: jbd2: use a folio in jbd2_journal_write_metadata_buffer()
Date: Thu, 13 Jul 2023 04:55:11 +0100

The primary goal here is removing the use of set_bh_page().  Take the
opportunity to switch from kmap_atomic() to kmap_local().  This simplifies
the function as the offset is already added to the pointer.

Link: https://lkml.kernel.org/r/20230713035512.4139457-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Sterba <dsterba@suse.com>
Cc: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Pankaj Raghav <p.raghav@samsung.com>
Cc: Tom Rix <trix@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/jbd2/journal.c |   35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

--- a/fs/jbd2/journal.c~jbd2-use-a-folio-in-jbd2_journal_write_metadata_buffer
+++ a/fs/jbd2/journal.c
@@ -341,7 +341,7 @@ int jbd2_journal_write_metadata_buffer(t
 	int do_escape = 0;
 	char *mapped_data;
 	struct buffer_head *new_bh;
-	struct page *new_page;
+	struct folio *new_folio;
 	unsigned int new_offset;
 	struct buffer_head *bh_in = jh2bh(jh_in);
 	journal_t *journal = transaction->t_journal;
@@ -370,14 +370,14 @@ repeat:
 	 */
 	if (jh_in->b_frozen_data) {
 		done_copy_out = 1;
-		new_page = virt_to_page(jh_in->b_frozen_data);
-		new_offset = offset_in_page(jh_in->b_frozen_data);
+		new_folio = virt_to_folio(jh_in->b_frozen_data);
+		new_offset = offset_in_folio(new_folio, jh_in->b_frozen_data);
 	} else {
-		new_page = jh2bh(jh_in)->b_page;
-		new_offset = offset_in_page(jh2bh(jh_in)->b_data);
+		new_folio = jh2bh(jh_in)->b_folio;
+		new_offset = offset_in_folio(new_folio, jh2bh(jh_in)->b_data);
 	}
 
-	mapped_data = kmap_atomic(new_page);
+	mapped_data = kmap_local_folio(new_folio, new_offset);
 	/*
 	 * Fire data frozen trigger if data already wasn't frozen.  Do this
 	 * before checking for escaping, as the trigger may modify the magic
@@ -385,18 +385,17 @@ repeat:
 	 * data in the buffer.
 	 */
 	if (!done_copy_out)
-		jbd2_buffer_frozen_trigger(jh_in, mapped_data + new_offset,
+		jbd2_buffer_frozen_trigger(jh_in, mapped_data,
 					   jh_in->b_triggers);
 
 	/*
 	 * Check for escaping
 	 */
-	if (*((__be32 *)(mapped_data + new_offset)) ==
-				cpu_to_be32(JBD2_MAGIC_NUMBER)) {
+	if (*((__be32 *)mapped_data) == cpu_to_be32(JBD2_MAGIC_NUMBER)) {
 		need_copy_out = 1;
 		do_escape = 1;
 	}
-	kunmap_atomic(mapped_data);
+	kunmap_local(mapped_data);
 
 	/*
 	 * Do we need to do a data copy?
@@ -417,12 +416,10 @@ repeat:
 		}
 
 		jh_in->b_frozen_data = tmp;
-		mapped_data = kmap_atomic(new_page);
-		memcpy(tmp, mapped_data + new_offset, bh_in->b_size);
-		kunmap_atomic(mapped_data);
+		memcpy_from_folio(tmp, new_folio, new_offset, bh_in->b_size);
 
-		new_page = virt_to_page(tmp);
-		new_offset = offset_in_page(tmp);
+		new_folio = virt_to_folio(tmp);
+		new_offset = offset_in_folio(new_folio, tmp);
 		done_copy_out = 1;
 
 		/*
@@ -438,12 +435,12 @@ repeat:
 	 * copying, we can finally do so.
 	 */
 	if (do_escape) {
-		mapped_data = kmap_atomic(new_page);
-		*((unsigned int *)(mapped_data + new_offset)) = 0;
-		kunmap_atomic(mapped_data);
+		mapped_data = kmap_local_folio(new_folio, new_offset);
+		*((unsigned int *)mapped_data) = 0;
+		kunmap_local(mapped_data);
 	}
 
-	set_bh_page(new_bh, new_page, new_offset);
+	folio_set_bh(new_bh, new_folio, new_offset);
 	new_bh->b_size = bh_in->b_size;
 	new_bh->b_bdev = journal->j_dev;
 	new_bh->b_blocknr = blocknr;
_

Patches currently in -mm which might be from willy@infradead.org are

mm-drop-per-vma-lock-when-returning-vm_fault_retry-or-vm_fault_completed-fix.patch
zswap-make-zswap_store-take-a-folio.patch
memcg-convert-get_obj_cgroup_from_page-to-get_obj_cgroup_from_folio.patch
swap-remove-some-calls-to-compound_head-in-swap_readpage.patch
zswap-make-zswap_load-take-a-folio.patch
mm-improve-the-comment-in-isolate_migratepages_block.patch
minmax-add-in_range-macro.patch
mm-convert-page_table_check_pte_set-to-page_table_check_ptes_set.patch
mm-add-generic-flush_icache_pages-and-documentation.patch
mm-add-folio_flush_mapping.patch
mm-remove-arch_implements_flush_dcache_folio.patch
mm-add-default-definition-of-set_ptes.patch
alpha-implement-the-new-page-table-range-api.patch
arc-implement-the-new-page-table-range-api.patch
arm-implement-the-new-page-table-range-api.patch
arm64-implement-the-new-page-table-range-api.patch
csky-implement-the-new-page-table-range-api.patch
hexagon-implement-the-new-page-table-range-api.patch
ia64-implement-the-new-page-table-range-api.patch
ia64-implement-the-new-page-table-range-api-fix.patch
loongarch-implement-the-new-page-table-range-api.patch
m68k-implement-the-new-page-table-range-api.patch
microblaze-implement-the-new-page-table-range-api.patch
mips-implement-the-new-page-table-range-api.patch
nios2-implement-the-new-page-table-range-api.patch
openrisc-implement-the-new-page-table-range-api.patch
parisc-implement-the-new-page-table-range-api.patch
powerpc-implement-the-new-page-table-range-api.patch
powerpc-implement-the-new-page-table-range-api-fix.patch
riscv-implement-the-new-page-table-range-api.patch
s390-implement-the-new-page-table-range-api.patch
sh-implement-the-new-page-table-range-api.patch
sparc32-implement-the-new-page-table-range-api.patch
sparc64-implement-the-new-page-table-range-api.patch
um-implement-the-new-page-table-range-api.patch
x86-implement-the-new-page-table-range-api.patch
xtensa-implement-the-new-page-table-range-api.patch
mm-remove-page_mapping_file.patch
mm-rationalise-flush_icache_pages-and-flush_icache_page.patch
mm-tidy-up-set_ptes-definition.patch
mm-use-flush_icache_pages-in-do_set_pmd.patch
mm-call-update_mmu_cache_range-in-more-page-fault-handling-paths.patch