5 files changed, 12 insertions, 95 deletions

diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index 07bc1fd43530..d583af7a2209 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c
@@ -523,6 +523,7 @@ vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_gr
 	struct netfs_group *group;
 	struct folio *folio = page_folio(vmf->page);
 	struct file *file = vmf->vma->vm_file;
+	struct address_space *mapping = file->f_mapping;
 	struct inode *inode = file_inode(file);
 	struct netfs_inode *ictx = netfs_inode(inode);
 	vm_fault_t ret = VM_FAULT_RETRY;
@@ -534,6 +535,11 @@ vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_gr
 
 	if (folio_lock_killable(folio) < 0)
 		goto out;
+	if (folio->mapping != mapping) {
+		folio_unlock(folio);
+		ret = VM_FAULT_NOPAGE;
+		goto out;
+	}
 
 	if (folio_wait_writeback_killable(folio)) {
 		ret = VM_FAULT_LOCKED;
@@ -549,9 +555,9 @@ vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_gr
 	group = netfs_folio_group(folio);
 	if (group != netfs_group && group != NETFS_FOLIO_COPY_TO_CACHE) {
 		folio_unlock(folio);
-		err = filemap_fdatawait_range(inode->i_mapping,
-					      folio_pos(folio),
-					      folio_pos(folio) + folio_size(folio));
+		err = filemap_fdatawrite_range(mapping,
+					       folio_pos(folio),
+					       folio_pos(folio) + folio_size(folio));
 		switch (err) {
 		case 0:
 			ret = VM_FAULT_RETRY;
diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c
index e14cd53ac9fd..88f2adfab75e 100644
--- a/fs/netfs/direct_write.c
+++ b/fs/netfs/direct_write.c
@@ -92,8 +92,9 @@ ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *
 	__set_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags);
 	if (async)
 		wreq->iocb = iocb;
+	wreq->len = iov_iter_count(&wreq->io_iter);
 	wreq->cleanup = netfs_cleanup_dio_write;
-	ret = netfs_unbuffered_write(wreq, is_sync_kiocb(iocb), iov_iter_count(&wreq->io_iter));
+	ret = netfs_unbuffered_write(wreq, is_sync_kiocb(iocb), wreq->len);
 	if (ret < 0) {
 		_debug("begin = %zd", ret);
 		goto out;
diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h
index 95e281a8af78..acd9ca14e264 100644
--- a/fs/netfs/internal.h
+++ b/fs/netfs/internal.h
@@ -63,15 +63,6 @@ static inline void netfs_proc_del_rreq(struct netfs_io_request *rreq) {}
 /*
  * misc.c
  */
-#define NETFS_FLAG_PUT_MARK		BIT(0)
-#define NETFS_FLAG_PAGECACHE_MARK	BIT(1)
-int netfs_xa_store_and_mark(struct xarray *xa, unsigned long index,
-			    struct folio *folio, unsigned int flags,
-			    gfp_t gfp_mask);
-int netfs_add_folios_to_buffer(struct xarray *buffer,
-			       struct address_space *mapping,
-			       pgoff_t index, pgoff_t to, gfp_t gfp_mask);
-void netfs_clear_buffer(struct xarray *buffer);
 
 /*
  * objects.c
diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c
index bc1fc54fb724..83e644bd518f 100644
--- a/fs/netfs/misc.c
+++ b/fs/netfs/misc.c
@@ -8,87 +8,6 @@
 #include <linux/swap.h>
 #include "internal.h"
 
-/*
- * Attach a folio to the buffer and maybe set marks on it to say that we need
- * to put the folio later and twiddle the pagecache flags.
- */
-int netfs_xa_store_and_mark(struct xarray *xa, unsigned long index,
-			    struct folio *folio, unsigned int flags,
-			    gfp_t gfp_mask)
-{
-	XA_STATE_ORDER(xas, xa, index, folio_order(folio));
-
-retry:
-	xas_lock(&xas);
-	for (;;) {
-		xas_store(&xas, folio);
-		if (!xas_error(&xas))
-			break;
-		xas_unlock(&xas);
-		if (!xas_nomem(&xas, gfp_mask))
-			return xas_error(&xas);
-		goto retry;
-	}
-
-	if (flags & NETFS_FLAG_PUT_MARK)
-		xas_set_mark(&xas, NETFS_BUF_PUT_MARK);
-	if (flags & NETFS_FLAG_PAGECACHE_MARK)
-		xas_set_mark(&xas, NETFS_BUF_PAGECACHE_MARK);
-	xas_unlock(&xas);
-	return xas_error(&xas);
-}
-
-/*
- * Create the specified range of folios in the buffer attached to the read
- * request.  The folios are marked with NETFS_BUF_PUT_MARK so that we know that
- * these need freeing later.
- */
-int netfs_add_folios_to_buffer(struct xarray *buffer,
-			       struct address_space *mapping,
-			       pgoff_t index, pgoff_t to, gfp_t gfp_mask)
-{
-	struct folio *folio;
-	int ret;
-
-	if (to + 1 == index) /* Page range is inclusive */
-		return 0;
-
-	do {
-		/* TODO: Figure out what order folio can be allocated here */
-		folio = filemap_alloc_folio(readahead_gfp_mask(mapping), 0);
-		if (!folio)
-			return -ENOMEM;
-		folio->index = index;
-		ret = netfs_xa_store_and_mark(buffer, index, folio,
-					      NETFS_FLAG_PUT_MARK, gfp_mask);
-		if (ret < 0) {
-			folio_put(folio);
-			return ret;
-		}
-
-		index += folio_nr_pages(folio);
-	} while (index <= to && index != 0);
-
-	return 0;
-}
-
-/*
- * Clear an xarray buffer, putting a ref on the folios that have
- * NETFS_BUF_PUT_MARK set.
- */
-void netfs_clear_buffer(struct xarray *buffer)
-{
-	struct folio *folio;
-	XA_STATE(xas, buffer, 0);
-
-	rcu_read_lock();
-	xas_for_each_marked(&xas, folio, ULONG_MAX, NETFS_BUF_PUT_MARK) {
-		folio_put(folio);
-	}
-	rcu_read_unlock();
-	xa_destroy(buffer);
-}
-
 /**
  * netfs_dirty_folio - Mark folio dirty and pin a cache object for writeback
  * @mapping: The mapping the folio belongs to.
diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index 3aa86e268f40..ec6cf8707fb0 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -483,7 +483,7 @@ static int netfs_write_folio(struct netfs_io_request *wreq,
 	if (!debug)
 		kdebug("R=%x: No submit", wreq->debug_id);
 
-	if (flen < fsize)
+	if (foff + flen < fsize)
 		for (int s = 0; s < NR_IO_STREAMS; s++)
 			netfs_issue_write(wreq, &wreq->io_streams[s]);