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Date: Mon, 14 Jun 2021 11:51:07 +0200
From: Jan Kara <jack@...e.cz>
To: Christoph Hellwig <hch@....de>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Jan Kara <jack@...e.cz>,
Al Viro <viro@...iv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm: require ->set_page_dirty to be explicitly wire up
On Mon 14-06-21 08:15:12, Christoph Hellwig wrote:
> Remove the CONFIG_BLOCK default to __set_page_dirty_buffers and just
> wire that method up for the missing instances.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
Make sense. Did you somehow autogenerate this? If this patch would race
with addition of new aops struct, we'd get null-ptr-defer out of that so
maybe providing the script would be better. But other than that the changes
look good to me. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/adfs/inode.c | 1 +
> fs/affs/file.c | 2 ++
> fs/bfs/file.c | 1 +
> fs/block_dev.c | 1 +
> fs/exfat/inode.c | 1 +
> fs/ext2/inode.c | 2 ++
> fs/fat/inode.c | 1 +
> fs/gfs2/meta_io.c | 2 ++
> fs/hfs/inode.c | 2 ++
> fs/hfsplus/inode.c | 2 ++
> fs/hpfs/file.c | 1 +
> fs/jfs/inode.c | 1 +
> fs/minix/inode.c | 1 +
> fs/nilfs2/mdt.c | 1 +
> fs/ocfs2/aops.c | 1 +
> fs/omfs/file.c | 1 +
> fs/sysv/itree.c | 1 +
> fs/udf/file.c | 1 +
> fs/udf/inode.c | 1 +
> fs/ufs/inode.c | 1 +
> mm/page-writeback.c | 18 ++++--------------
> 21 files changed, 29 insertions(+), 14 deletions(-)
>
> diff --git a/fs/adfs/inode.c b/fs/adfs/inode.c
> index fb7ee026d101..adbb3a1edcbf 100644
> --- a/fs/adfs/inode.c
> +++ b/fs/adfs/inode.c
> @@ -73,6 +73,7 @@ static sector_t _adfs_bmap(struct address_space *mapping, sector_t block)
> }
>
> static const struct address_space_operations adfs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = adfs_readpage,
> .writepage = adfs_writepage,
> .write_begin = adfs_write_begin,
> diff --git a/fs/affs/file.c b/fs/affs/file.c
> index d91b0133d95d..75ebd2b576ca 100644
> --- a/fs/affs/file.c
> +++ b/fs/affs/file.c
> @@ -453,6 +453,7 @@ static sector_t _affs_bmap(struct address_space *mapping, sector_t block)
> }
>
> const struct address_space_operations affs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = affs_readpage,
> .writepage = affs_writepage,
> .write_begin = affs_write_begin,
> @@ -833,6 +834,7 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
> }
>
> const struct address_space_operations affs_aops_ofs = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = affs_readpage_ofs,
> //.writepage = affs_writepage_ofs,
> .write_begin = affs_write_begin_ofs,
> diff --git a/fs/bfs/file.c b/fs/bfs/file.c
> index 0dceefc54b48..7f8544abf636 100644
> --- a/fs/bfs/file.c
> +++ b/fs/bfs/file.c
> @@ -188,6 +188,7 @@ static sector_t bfs_bmap(struct address_space *mapping, sector_t block)
> }
>
> const struct address_space_operations bfs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = bfs_readpage,
> .writepage = bfs_writepage,
> .write_begin = bfs_write_begin,
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 6cc4d4cfe0c2..eb34f5c357cf 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -1754,6 +1754,7 @@ static int blkdev_writepages(struct address_space *mapping,
> }
>
> static const struct address_space_operations def_blk_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = blkdev_readpage,
> .readahead = blkdev_readahead,
> .writepage = blkdev_writepage,
> diff --git a/fs/exfat/inode.c b/fs/exfat/inode.c
> index 1803ef3220fd..ca37d4344361 100644
> --- a/fs/exfat/inode.c
> +++ b/fs/exfat/inode.c
> @@ -491,6 +491,7 @@ int exfat_block_truncate_page(struct inode *inode, loff_t from)
> }
>
> static const struct address_space_operations exfat_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = exfat_readpage,
> .readahead = exfat_readahead,
> .writepage = exfat_writepage,
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 68178b2234bd..bf41f579ed3e 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -961,6 +961,7 @@ ext2_dax_writepages(struct address_space *mapping, struct writeback_control *wbc
> }
>
> const struct address_space_operations ext2_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = ext2_readpage,
> .readahead = ext2_readahead,
> .writepage = ext2_writepage,
> @@ -975,6 +976,7 @@ const struct address_space_operations ext2_aops = {
> };
>
> const struct address_space_operations ext2_nobh_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = ext2_readpage,
> .readahead = ext2_readahead,
> .writepage = ext2_nobh_writepage,
> diff --git a/fs/fat/inode.c b/fs/fat/inode.c
> index bab9b202b496..de0c9b013a85 100644
> --- a/fs/fat/inode.c
> +++ b/fs/fat/inode.c
> @@ -342,6 +342,7 @@ int fat_block_truncate_page(struct inode *inode, loff_t from)
> }
>
> static const struct address_space_operations fat_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = fat_readpage,
> .readahead = fat_readahead,
> .writepage = fat_writepage,
> diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
> index d68184ebbfdd..7c9619997355 100644
> --- a/fs/gfs2/meta_io.c
> +++ b/fs/gfs2/meta_io.c
> @@ -89,11 +89,13 @@ static int gfs2_aspace_writepage(struct page *page, struct writeback_control *wb
> }
>
> const struct address_space_operations gfs2_meta_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .writepage = gfs2_aspace_writepage,
> .releasepage = gfs2_releasepage,
> };
>
> const struct address_space_operations gfs2_rgrp_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .writepage = gfs2_aspace_writepage,
> .releasepage = gfs2_releasepage,
> };
> diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
> index 3fc5cb346586..4a95a92546a0 100644
> --- a/fs/hfs/inode.c
> +++ b/fs/hfs/inode.c
> @@ -159,6 +159,7 @@ static int hfs_writepages(struct address_space *mapping,
> }
>
> const struct address_space_operations hfs_btree_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = hfs_readpage,
> .writepage = hfs_writepage,
> .write_begin = hfs_write_begin,
> @@ -168,6 +169,7 @@ const struct address_space_operations hfs_btree_aops = {
> };
>
> const struct address_space_operations hfs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = hfs_readpage,
> .writepage = hfs_writepage,
> .write_begin = hfs_write_begin,
> diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
> index 8ea447e5c470..70e8374ddac4 100644
> --- a/fs/hfsplus/inode.c
> +++ b/fs/hfsplus/inode.c
> @@ -156,6 +156,7 @@ static int hfsplus_writepages(struct address_space *mapping,
> }
>
> const struct address_space_operations hfsplus_btree_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = hfsplus_readpage,
> .writepage = hfsplus_writepage,
> .write_begin = hfsplus_write_begin,
> @@ -165,6 +166,7 @@ const struct address_space_operations hfsplus_btree_aops = {
> };
>
> const struct address_space_operations hfsplus_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = hfsplus_readpage,
> .writepage = hfsplus_writepage,
> .write_begin = hfsplus_write_begin,
> diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
> index 077c25128eb7..c3a49aacf20a 100644
> --- a/fs/hpfs/file.c
> +++ b/fs/hpfs/file.c
> @@ -196,6 +196,7 @@ static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
> }
>
> const struct address_space_operations hpfs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = hpfs_readpage,
> .writepage = hpfs_writepage,
> .readahead = hpfs_readahead,
> diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
> index 6f65bfa9f18d..3663dd5a23bc 100644
> --- a/fs/jfs/inode.c
> +++ b/fs/jfs/inode.c
> @@ -356,6 +356,7 @@ static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
> }
>
> const struct address_space_operations jfs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = jfs_readpage,
> .readahead = jfs_readahead,
> .writepage = jfs_writepage,
> diff --git a/fs/minix/inode.c b/fs/minix/inode.c
> index a532a99bbe81..a71f1cf894b9 100644
> --- a/fs/minix/inode.c
> +++ b/fs/minix/inode.c
> @@ -442,6 +442,7 @@ static sector_t minix_bmap(struct address_space *mapping, sector_t block)
> }
>
> static const struct address_space_operations minix_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = minix_readpage,
> .writepage = minix_writepage,
> .write_begin = minix_write_begin,
> diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c
> index c0361ce45f62..97769fe4d588 100644
> --- a/fs/nilfs2/mdt.c
> +++ b/fs/nilfs2/mdt.c
> @@ -434,6 +434,7 @@ nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc)
>
>
> static const struct address_space_operations def_mdt_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .writepage = nilfs_mdt_write_page,
> };
>
> diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
> index 1294925ac94a..b3517de178ff 100644
> --- a/fs/ocfs2/aops.c
> +++ b/fs/ocfs2/aops.c
> @@ -2454,6 +2454,7 @@ static ssize_t ocfs2_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
> }
>
> const struct address_space_operations ocfs2_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = ocfs2_readpage,
> .readahead = ocfs2_readahead,
> .writepage = ocfs2_writepage,
> diff --git a/fs/omfs/file.c b/fs/omfs/file.c
> index 11e733aab25d..89725b15a64b 100644
> --- a/fs/omfs/file.c
> +++ b/fs/omfs/file.c
> @@ -372,6 +372,7 @@ const struct inode_operations omfs_file_inops = {
> };
>
> const struct address_space_operations omfs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = omfs_readpage,
> .readahead = omfs_readahead,
> .writepage = omfs_writepage,
> diff --git a/fs/sysv/itree.c b/fs/sysv/itree.c
> index 8b2e99b7bc9f..749385015a8d 100644
> --- a/fs/sysv/itree.c
> +++ b/fs/sysv/itree.c
> @@ -495,6 +495,7 @@ static sector_t sysv_bmap(struct address_space *mapping, sector_t block)
> }
>
> const struct address_space_operations sysv_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = sysv_readpage,
> .writepage = sysv_writepage,
> .write_begin = sysv_write_begin,
> diff --git a/fs/udf/file.c b/fs/udf/file.c
> index 2846dcd92197..1baff8ddb754 100644
> --- a/fs/udf/file.c
> +++ b/fs/udf/file.c
> @@ -125,6 +125,7 @@ static int udf_adinicb_write_end(struct file *file, struct address_space *mappin
> }
>
> const struct address_space_operations udf_adinicb_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = udf_adinicb_readpage,
> .writepage = udf_adinicb_writepage,
> .write_begin = udf_adinicb_write_begin,
> diff --git a/fs/udf/inode.c b/fs/udf/inode.c
> index 0dd2f93ac048..4917670860a0 100644
> --- a/fs/udf/inode.c
> +++ b/fs/udf/inode.c
> @@ -235,6 +235,7 @@ static sector_t udf_bmap(struct address_space *mapping, sector_t block)
> }
>
> const struct address_space_operations udf_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = udf_readpage,
> .readahead = udf_readahead,
> .writepage = udf_writepage,
> diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
> index debc282c1bb4..ac628de69601 100644
> --- a/fs/ufs/inode.c
> +++ b/fs/ufs/inode.c
> @@ -526,6 +526,7 @@ static sector_t ufs_bmap(struct address_space *mapping, sector_t block)
> }
>
> const struct address_space_operations ufs_aops = {
> + .set_page_dirty = __set_page_dirty_buffers,
> .readpage = ufs_readpage,
> .writepage = ufs_writepage,
> .write_begin = ufs_write_begin,
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index 0062d5c57d41..081fa02236c2 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -32,7 +32,6 @@
> #include <linux/sysctl.h>
> #include <linux/cpu.h>
> #include <linux/syscalls.h>
> -#include <linux/buffer_head.h> /* __set_page_dirty_buffers */
> #include <linux/pagevec.h>
> #include <linux/timer.h>
> #include <linux/sched/rt.h>
> @@ -2546,13 +2545,9 @@ EXPORT_SYMBOL(redirty_page_for_writepage);
> /*
> * Dirty a page.
> *
> - * For pages with a mapping this should be done under the page lock
> - * for the benefit of asynchronous memory errors who prefer a consistent
> - * dirty state. This rule can be broken in some special cases,
> - * but should be better not to.
> - *
> - * If the mapping doesn't provide a set_page_dirty a_op, then
> - * just fall through and assume that it wants buffer_heads.
> + * For pages with a mapping this should be done under the page lock for the
> + * benefit of asynchronous memory errors who prefer a consistent dirty state.
> + * This rule can be broken in some special cases, but should be better not to.
> */
> int set_page_dirty(struct page *page)
> {
> @@ -2560,7 +2555,6 @@ int set_page_dirty(struct page *page)
>
> page = compound_head(page);
> if (likely(mapping)) {
> - int (*spd)(struct page *) = mapping->a_ops->set_page_dirty;
> /*
> * readahead/lru_deactivate_page could remain
> * PG_readahead/PG_reclaim due to race with end_page_writeback
> @@ -2573,11 +2567,7 @@ int set_page_dirty(struct page *page)
> */
> if (PageReclaim(page))
> ClearPageReclaim(page);
> -#ifdef CONFIG_BLOCK
> - if (!spd)
> - spd = __set_page_dirty_buffers;
> -#endif
> - return (*spd)(page);
> + return mapping->a_ops->set_page_dirty(page);
> }
> if (!PageDirty(page)) {
> if (!TestSetPageDirty(page))
> --
> 2.30.2
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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