linux-ext4 - [PATCH 18/23] richacl: Add helper function for creating richacl from mode values.

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Message-Id: <1265002505-8387-19-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
Date:	Mon,  1 Feb 2010 11:05:00 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	sfrench@...ibm.com, ffilz@...ibm.com, agruen@...e.de,
	adilger@....com, sandeen@...hat.com, tytso@....edu,
	staubach@...hat.com, bfields@...i.umich.edu, jlayton@...hat.com
Cc:	aneesh.kumar@...ux.vnet.ibm.com, linux-fsdevel@...r.kernel.org,
	nfsv4@...ux-nfs.org, linux-ext4@...r.kernel.org
Subject: [PATCH 18/23] richacl: Add helper function for creating richacl from mode values.

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@...ux.vnet.ibm.com>
---
 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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