The comment about the page always being locked is wrong, so copy
the locking protection from __set_page_dirty_buffers(). That
means moving the call to nilfs_set_file_dirty() down the
function so as to not acquire a new dependency between the
mapping->private_lock and the ns_inode_lock. That might be a
harmless dependency to add, but it's not necessary.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/nilfs2/inode.c | 39 +++++++++++++++++++--------------------
1 file changed, 19 insertions(+), 20 deletions(-)
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 153f0569dcf2..c1219c0678a5 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -199,23 +199,23 @@ static int nilfs_writepage(struct page *page, struct writeback_control *wbc)
return 0;
}
-static int nilfs_set_page_dirty(struct page *page)
+static bool nilfs_dirty_folio(struct address_space *mapping,
+ struct folio *folio)
{
- struct inode *inode = page->mapping->host;
- int ret = __set_page_dirty_nobuffers(page);
+ struct inode *inode = mapping->host;
+ struct buffer_head *head;
+ unsigned int nr_dirty;
+ bool ret = filemap_dirty_folio(mapping, folio);
- if (page_has_buffers(page)) {
- unsigned int nr_dirty = 0;
- struct buffer_head *bh, *head;
+ /*
+ * The page may not be locked, eg if called from try_to_unmap_one()
+ */
+ spin_lock(&mapping->private_lock);
+ head = folio_buffers(folio);
+ if (head) {
+ struct buffer_head *bh = head;
- /*
- * This page is locked by callers, and no other thread
- * concurrently marks its buffers dirty since they are
- * only dirtied through routines in fs/buffer.c in
- * which call sites of mark_buffer_dirty are protected
- * by page lock.
- */
- bh = head = page_buffers(page);
+ nr_dirty = 0;
do {
/* Do not mark hole blocks dirty */
if (buffer_dirty(bh) || !buffer_mapped(bh))
@@ -224,14 +224,13 @@ static int nilfs_set_page_dirty(struct page *page)
set_buffer_dirty(bh);
nr_dirty++;
} while (bh = bh->b_this_page, bh != head);
-
- if (nr_dirty)
- nilfs_set_file_dirty(inode, nr_dirty);
} else if (ret) {
- unsigned int nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
+ nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits);
+ }
+ spin_unlock(&mapping->private_lock);
+ if (nr_dirty)
nilfs_set_file_dirty(inode, nr_dirty);
- }
return ret;
}
@@ -299,7 +298,7 @@ const struct address_space_operations nilfs_aops = {
.writepage = nilfs_writepage,
.readpage = nilfs_readpage,
.writepages = nilfs_writepages,
- .set_page_dirty = nilfs_set_page_dirty,
+ .dirty_folio = nilfs_dirty_folio,
.readahead = nilfs_readahead,
.write_begin = nilfs_write_begin,
.write_end = nilfs_write_end,
--
2.34.1
