mm/writeback: Add folio_wait_writeback()

wait_on_page_writeback_killable() only has one caller, so convert it to
call folio_wait_writeback_killable().  For the wait_on_page_writeback()
callers, add a compatibility wrapper around folio_wait_writeback().

Turning PageWriteback() into folio_test_writeback() eliminates a call
to compound_head() which saves 8 bytes and 15 bytes in the two
functions.  Unfortunately, that is more than offset by adding the
wait_on_page_writeback compatibility wrapper for a net increase in text
of 7 bytes.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Howells <dhowells@redhat.com>

diff --git a/fs/afs/write.c b/fs/afs/write.c
index 2dfe3b3..5103328 100644 (file)
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -861,7 +861,8 @@ int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
  */
 vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
 {
-       struct page *page = thp_head(vmf->page);
+       struct folio *folio = page_folio(vmf->page);
+       struct page *page = &folio->page;
        struct file *file = vmf->vma->vm_file;
        struct inode *inode = file_inode(file);
        struct afs_vnode *vnode = AFS_FS_I(inode);
@@ -884,7 +885,7 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
                goto out;
 #endif
 
-       if (wait_on_page_writeback_killable(page))
+       if (folio_wait_writeback_killable(folio))
                goto out;
 
        if (lock_page_killable(page) < 0)
@@ -894,8 +895,8 @@ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
         * details the portion of the page we need to write back and we might
         * need to redirty the page if there's a problem.
         */
-       if (wait_on_page_writeback_killable(page) < 0) {
-               unlock_page(page);
+       if (folio_wait_writeback_killable(folio) < 0) {
+               folio_unlock(folio);
                goto out;
        }
 

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index d9dcd33..e6013c0 100644 (file)
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -766,7 +766,8 @@ static inline int wait_on_page_locked_killable(struct page *page)
 
 int put_and_wait_on_page_locked(struct page *page, int state);
 void wait_on_page_writeback(struct page *page);
-int wait_on_page_writeback_killable(struct page *page);
+void folio_wait_writeback(struct folio *folio);
+int folio_wait_writeback_killable(struct folio *folio);
 void end_page_writeback(struct page *page);
 void folio_end_writeback(struct folio *folio);
 void wait_for_stable_page(struct page *page);

diff --git a/mm/folio-compat.c b/mm/folio-compat.c
index 526843d..41275da 100644 (file)
--- a/mm/folio-compat.c
+++ b/mm/folio-compat.c
@@ -23,3 +23,9 @@ void end_page_writeback(struct page *page)
        return folio_end_writeback(page_folio(page));
 }
 EXPORT_SYMBOL(end_page_writeback);
+
+void wait_on_page_writeback(struct page *page)
+{
+       return folio_wait_writeback(page_folio(page));
+}
+EXPORT_SYMBOL_GPL(wait_on_page_writeback);

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 4812a17..c7f40c9 100644 (file)
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2873,33 +2873,51 @@ int __test_set_page_writeback(struct page *page, bool keep_write)
 }
 EXPORT_SYMBOL(__test_set_page_writeback);
 
-/*
- * Wait for a page to complete writeback
+/**
+ * folio_wait_writeback - Wait for a folio to finish writeback.
+ * @folio: The folio to wait for.
+ *
+ * If the folio is currently being written back to storage, wait for the
+ * I/O to complete.
+ *
+ * Context: Sleeps.  Must be called in process context and with
+ * no spinlocks held.  Caller should hold a reference on the folio.
+ * If the folio is not locked, writeback may start again after writeback
+ * has finished.
  */
-void wait_on_page_writeback(struct page *page)
+void folio_wait_writeback(struct folio *folio)
 {
-       while (PageWriteback(page)) {
-               trace_wait_on_page_writeback(page, page_mapping(page));
-               wait_on_page_bit(page, PG_writeback);
+       while (folio_test_writeback(folio)) {
+               trace_wait_on_page_writeback(&folio->page, folio_mapping(folio));
+               wait_on_page_bit(&folio->page, PG_writeback);
        }
 }
-EXPORT_SYMBOL_GPL(wait_on_page_writeback);
+EXPORT_SYMBOL_GPL(folio_wait_writeback);
 
-/*
- * Wait for a page to complete writeback.  Returns -EINTR if we get a
- * fatal signal while waiting.
+/**
+ * folio_wait_writeback_killable - Wait for a folio to finish writeback.
+ * @folio: The folio to wait for.
+ *
+ * If the folio is currently being written back to storage, wait for the
+ * I/O to complete or a fatal signal to arrive.
+ *
+ * Context: Sleeps.  Must be called in process context and with
+ * no spinlocks held.  Caller should hold a reference on the folio.
+ * If the folio is not locked, writeback may start again after writeback
+ * has finished.
+ * Return: 0 on success, -EINTR if we get a fatal signal while waiting.
  */
-int wait_on_page_writeback_killable(struct page *page)
+int folio_wait_writeback_killable(struct folio *folio)
 {
-       while (PageWriteback(page)) {
-               trace_wait_on_page_writeback(page, page_mapping(page));
-               if (wait_on_page_bit_killable(page, PG_writeback))
+       while (folio_test_writeback(folio)) {
+               trace_wait_on_page_writeback(&folio->page, folio_mapping(folio));
+               if (wait_on_page_bit_killable(&folio->page, PG_writeback))
                        return -EINTR;
        }
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(wait_on_page_writeback_killable);
+EXPORT_SYMBOL_GPL(folio_wait_writeback_killable);
 
 /**
  * wait_for_stable_page() - wait for writeback to finish, if necessary.