[PATCH v2 1/3] xfs: Remove xfs_filemap_map_pages() wrapper

[Matthew Wilcox (Oracle)]

XFS doesn't actually need to be holding the XFS_MMAPLOCK_SHARED to do
this.  filemap_map_pages() cannot bring new folios into the page cache
and the folio lock is taken during filemap_map_pages() which provides
sufficient protection against a truncation or hole punch.

Signed-off-by: Matthew Wilcox (Oracle) <willy at infradead.org>
---
 fs/xfs/xfs_file.c | 17 +----------------
 1 file changed, 1 insertion(+), 16 deletions(-)

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 863289aaa441..aede746541f8 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1389,25 +1389,10 @@ xfs_filemap_pfn_mkwrite(
 	return __xfs_filemap_fault(vmf, PE_SIZE_PTE, true);
 }
 
-static vm_fault_t
-xfs_filemap_map_pages(
-	struct vm_fault		*vmf,
-	pgoff_t			start_pgoff,
-	pgoff_t			end_pgoff)
-{
-	struct inode		*inode = file_inode(vmf->vma->vm_file);
-	vm_fault_t ret;
-
-	xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
-	ret = filemap_map_pages(vmf, start_pgoff, end_pgoff);
-	xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED);
-	return ret;
-}
-
 static const struct vm_operations_struct xfs_file_vm_ops = {
 	.fault		= xfs_filemap_fault,
 	.huge_fault	= xfs_filemap_huge_fault,
-	.map_pages	= xfs_filemap_map_pages,
+	.map_pages	= filemap_map_pages,
 	.page_mkwrite	= xfs_filemap_page_mkwrite,
 	.pfn_mkwrite	= xfs_filemap_pfn_mkwrite,
 };
-- 
2.39.2