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Date: Wed, 12 Apr 2017 14:15:54 +0200
From: Jan Kara <jack@...e.cz>
To: Jeff Layton <jlayton@...hat.com>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org, tytso@....edu, jack@...e.cz,
willy@...radead.org, neilb@...e.com, viro@...iv.linux.org.uk
Subject: Re: [PATCH v2 01/17] mm: drop "wait" parameter from write_one_page
On Wed 12-04-17 08:05:58, Jeff Layton wrote:
> The callers all set it to 1. Also, make it clear that this function will
> not set any sort of AS_* error, and that the caller must do so if
> necessary. No existing caller uses this on normal files, so none of them
> need it.
>
> Signed-off-by: Jeff Layton <jlayton@...hat.com>
> Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>
Honza
> ---
> fs/exofs/dir.c | 2 +-
> fs/ext2/dir.c | 2 +-
> fs/jfs/jfs_metapage.c | 4 ++--
> fs/minix/dir.c | 2 +-
> fs/sysv/dir.c | 2 +-
> fs/ufs/dir.c | 2 +-
> include/linux/mm.h | 2 +-
> mm/page-writeback.c | 14 +++++++-------
> 8 files changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/fs/exofs/dir.c b/fs/exofs/dir.c
> index 42f9a0a0c4ca..e163ed980c20 100644
> --- a/fs/exofs/dir.c
> +++ b/fs/exofs/dir.c
> @@ -72,7 +72,7 @@ static int exofs_commit_chunk(struct page *page, loff_t pos, unsigned len)
> set_page_dirty(page);
>
> if (IS_DIRSYNC(dir))
> - err = write_one_page(page, 1);
> + err = write_one_page(page);
> else
> unlock_page(page);
>
> diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
> index d9650c9508e4..e2709695b177 100644
> --- a/fs/ext2/dir.c
> +++ b/fs/ext2/dir.c
> @@ -100,7 +100,7 @@ static int ext2_commit_chunk(struct page *page, loff_t pos, unsigned len)
> }
>
> if (IS_DIRSYNC(dir)) {
> - err = write_one_page(page, 1);
> + err = write_one_page(page);
> if (!err)
> err = sync_inode_metadata(dir, 1);
> } else {
> diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
> index 489aaa1403e5..744fa3c079e6 100644
> --- a/fs/jfs/jfs_metapage.c
> +++ b/fs/jfs/jfs_metapage.c
> @@ -711,7 +711,7 @@ void force_metapage(struct metapage *mp)
> get_page(page);
> lock_page(page);
> set_page_dirty(page);
> - write_one_page(page, 1);
> + write_one_page(page);
> clear_bit(META_forcewrite, &mp->flag);
> put_page(page);
> }
> @@ -756,7 +756,7 @@ void release_metapage(struct metapage * mp)
> set_page_dirty(page);
> if (test_bit(META_sync, &mp->flag)) {
> clear_bit(META_sync, &mp->flag);
> - write_one_page(page, 1);
> + write_one_page(page);
> lock_page(page); /* write_one_page unlocks the page */
> }
> } else if (mp->lsn) /* discard_metapage doesn't remove it */
> diff --git a/fs/minix/dir.c b/fs/minix/dir.c
> index 7edc9b395700..baa9721f1299 100644
> --- a/fs/minix/dir.c
> +++ b/fs/minix/dir.c
> @@ -57,7 +57,7 @@ static int dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
> mark_inode_dirty(dir);
> }
> if (IS_DIRSYNC(dir))
> - err = write_one_page(page, 1);
> + err = write_one_page(page);
> else
> unlock_page(page);
> return err;
> diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
> index 5bdae85ceef7..f5191cb2c947 100644
> --- a/fs/sysv/dir.c
> +++ b/fs/sysv/dir.c
> @@ -45,7 +45,7 @@ static int dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
> mark_inode_dirty(dir);
> }
> if (IS_DIRSYNC(dir))
> - err = write_one_page(page, 1);
> + err = write_one_page(page);
> else
> unlock_page(page);
> return err;
> diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
> index de01b8f2aa78..48609f1d9580 100644
> --- a/fs/ufs/dir.c
> +++ b/fs/ufs/dir.c
> @@ -53,7 +53,7 @@ static int ufs_commit_chunk(struct page *page, loff_t pos, unsigned len)
> mark_inode_dirty(dir);
> }
> if (IS_DIRSYNC(dir))
> - err = write_one_page(page, 1);
> + err = write_one_page(page);
> else
> unlock_page(page);
> return err;
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 00a8fa7e366a..f25b76486645 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2187,7 +2187,7 @@ extern void filemap_map_pages(struct vm_fault *vmf,
> extern int filemap_page_mkwrite(struct vm_fault *vmf);
>
> /* mm/page-writeback.c */
> -int write_one_page(struct page *page, int wait);
> +int write_one_page(struct page *page);
> void task_dirty_inc(struct task_struct *tsk);
>
> /* readahead.c */
> diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> index d8ac2a7fb9e7..de0dbf12e2c1 100644
> --- a/mm/page-writeback.c
> +++ b/mm/page-writeback.c
> @@ -2361,15 +2361,16 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
> }
>
> /**
> - * write_one_page - write out a single page and optionally wait on I/O
> + * write_one_page - write out a single page and wait on I/O
> * @page: the page to write
> - * @wait: if true, wait on writeout
> *
> * The page must be locked by the caller and will be unlocked upon return.
> *
> - * write_one_page() returns a negative error code if I/O failed.
> + * write_one_page() returns a negative error code if I/O failed. Note that
> + * the address_space is not marked for error. The caller must do this if
> + * needed.
> */
> -int write_one_page(struct page *page, int wait)
> +int write_one_page(struct page *page)
> {
> struct address_space *mapping = page->mapping;
> int ret = 0;
> @@ -2380,13 +2381,12 @@ int write_one_page(struct page *page, int wait)
>
> BUG_ON(!PageLocked(page));
>
> - if (wait)
> - wait_on_page_writeback(page);
> + wait_on_page_writeback(page);
>
> if (clear_page_dirty_for_io(page)) {
> get_page(page);
> ret = mapping->a_ops->writepage(page, &wbc);
> - if (ret == 0 && wait) {
> + if (ret == 0) {
> wait_on_page_writeback(page);
> if (PageError(page))
> ret = -EIO;
> --
> 2.9.3
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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