[PATCH v3 01/20] mm: drop "wait" parameter from write_one_page

Jeff Layton
2017-04-24T13:23:10Z

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.

Also, add __must_check here since, in general, the callers need to
handle an error here in some fashion.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
---
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..403f78afee20 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 __must_check 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