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 11b37a7..be87a20 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1447,6 +1447,14 @@ 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>