diff options
Diffstat (limited to 'include/linux/mm_types.h')
| -rw-r--r-- | include/linux/mm_types.h | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 07d9acb5b19c..911c40ee4472 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -334,11 +334,18 @@ struct vm_area_struct { /* * For areas with an address space and backing store, * linkage into the address_space->i_mmap interval tree. + * + * For private anonymous mappings, a pointer to a null terminated string + * in the user process containing the name given to the vma, or NULL + * if unnamed. */ - struct { - struct rb_node rb; - unsigned long rb_subtree_last; - } shared; + union { + struct { + struct rb_node rb; + unsigned long rb_subtree_last; + } shared; + const char __user *anon_name; + }; /* * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma @@ -791,4 +798,13 @@ typedef struct { unsigned long val; } swp_entry_t; +/* Return the name for an anonymous mapping or NULL for a file-backed mapping */ +static inline const char __user *vma_get_anon_name(struct vm_area_struct *vma) +{ + if (vma->vm_file) + return NULL; + + return vma->anon_name; +} + #endif /* _LINUX_MM_TYPES_H */ |