When we don't have richacl stored on disk for permission check
we need to generate richacl from mode values. This patch adds
a helper function for doing that.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
---
fs/richacl_base.c | 29 +++++++++++++++++++++++++++++
include/linux/richacl.h | 1 +
2 files changed, 30 insertions(+), 0 deletions(-)
diff --git a/fs/richacl_base.c b/fs/richacl_base.c
index 4a340d7..5d61b30 100644
--- a/fs/richacl_base.c
+++ b/fs/richacl_base.c
@@ -640,3 +640,32 @@ richacl_inherit(const struct richacl *dir_acl, mode_t mode)
return acl;
}
EXPORT_SYMBOL_GPL(richacl_inherit);
+
+struct richacl *
+richacl_from_mode(mode_t mode)
+{
+ struct richacl *acl;
+ struct richace *ace;
+ int is_dir = S_ISDIR(mode);
+
+ acl = richacl_alloc(1);
+ if (!acl)
+ return NULL;
+ ace = acl->a_entries;
+
+ acl->a_owner_mask = richacl_mode_to_mask(mode >> 6, is_dir);
+ acl->a_group_mask = richacl_mode_to_mask(mode >> 3, is_dir);
+ acl->a_other_mask = richacl_mode_to_mask(mode, is_dir);
+
+ ace->e_type = ACE4_ACCESS_ALLOWED_ACE_TYPE;
+ ace->e_flags = ACE4_SPECIAL_WHO;
+ ace->e_mask = ACE4_VALID_MASK;
+ ace->u.e_who = richace_everyone_who;
+ if (richacl_apply_masks(&acl)) {
+ richacl_put(acl);
+ acl = NULL;
+ }
+ return acl;
+
+}
+EXPORT_SYMBOL_GPL(richacl_from_mode);
diff --git a/include/linux/richacl.h b/include/linux/richacl.h
index 705e061..ecb76bc 100644
--- a/include/linux/richacl.h
+++ b/include/linux/richacl.h
@@ -238,5 +238,6 @@ extern int richacl_apply_masks(struct richacl **acl);
extern int richacl_write_through(struct richacl **acl);
extern struct richacl *map_posix_to_richacl(struct inode *, struct posix_acl *,
struct posix_acl *);
+extern struct richacl *richacl_from_mode(mode_t);
#endif /* __RICHACL_H */
--
1.7.0.rc0.48.gdace5
--
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