[PATCH v5 3/8] tmpfs: bump the mtime/ctime/iversion when page becomes writeable

Jeff Layton
2023-07-13T23:02:31Z

Most filesystems that use the pagecache will update the mtime, ctime,
and change attribute when a page becomes writeable. Add a page_mkwrite
operation for tmpfs and just use it to bump the mtime, ctime and change
attribute.

This fixes xfstest generic/080 on tmpfs.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
mm/shmem.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index b154af49d2df..654d9a585820 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2169,6 +2169,16 @@ static vm_fault_t shmem_fault(struct vm_fault *vmf)
return ret;
}

+static vm_fault_t shmem_page_mkwrite(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct inode *inode = file_inode(vma->vm_file);
+
+ file_update_time(vma->vm_file);
+ inode_inc_iversion(inode);
+ return 0;
+}
+
unsigned long shmem_get_unmapped_area(struct file *file,
unsigned long uaddr, unsigned long len,
unsigned long pgoff, unsigned long flags)
@@ -4210,6 +4220,7 @@ static const struct super_operations shmem_ops = {

static const struct vm_operations_struct shmem_vm_ops = {
.fault = shmem_fault,
+ .page_mkwrite = shmem_page_mkwrite,
.map_pages = filemap_map_pages,
#ifdef CONFIG_NUMA
.set_policy = shmem_set_policy,
@@ -4219,6 +4230,7 @@ static const struct vm_operations_struct shmem_vm_ops = {

static const struct vm_operations_struct shmem_anon_vm_ops = {
.fault = shmem_fault,
+ .page_mkwrite = shmem_page_mkwrite,
.map_pages = filemap_map_pages,
#ifdef CONFIG_NUMA
.set_policy = shmem_set_policy,

--
2.41.0