Add a simple helper to check if a vm area belongs to shmem.
Signed-off-by: Jerome Marchand <jmarchan@xxxxxxxxxx>
---
include/linux/mm.h | 6 ++++++
mm/shmem.c | 8 ++++++++
2 files changed, 14 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 34099fa..04a58d1 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1074,11 +1074,17 @@ int shmem_zero_setup(struct vm_area_struct *);
extern int shmem_locate(struct vm_area_struct *vma, pgoff_t pgoff, int *count);
bool shmem_mapping(struct address_space *mapping);
+bool shmem_vma(struct vm_area_struct *vma);
+
#else
static inline bool shmem_mapping(struct address_space *mapping)
{
return false;
}
+static inline bool shmem_vma(struct vm_area_struct *vma)
+{
+ return false;
+}
#endif
extern int can_do_mlock(void);
diff --git a/mm/shmem.c b/mm/shmem.c
index 8aa4892..7d16227 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1483,6 +1483,14 @@ bool shmem_mapping(struct address_space *mapping)
return mapping->backing_dev_info == &shmem_backing_dev_info;
}
+bool shmem_vma(struct vm_area_struct *vma)
+{
+ return (vma->vm_file &&
+ vma->vm_file->f_dentry->d_inode->i_mapping->backing_dev_info
+ == &shmem_backing_dev_info);
+
+}
+
#ifdef CONFIG_TMPFS
static const struct inode_operations shmem_symlink_inode_operations;
static const struct inode_operations shmem_short_symlink_operations;
--
1.9.3
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