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@xxxxxxxxxxxxx>
---
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
