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Groups > linux.kernel > #1171703

[RFC v4 19/31] ext4: Add richacl feature flag

From Andreas Gruenbacher <andreas.gruenbacher@gmail.com>
Newsgroups linux.kernel
Subject [RFC v4 19/31] ext4: Add richacl feature flag
Date 2015-06-25 00:10 +0200
Message-ID <pF11M-5Zy-5@gated-at.bofh.it> (permalink)
References <pF0S5-5yK-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>

This feature flag selects richacl instead of posix acl support on the file
system. In addition, the "acl" mount option is needed for enabling either of
the two kinds of acls.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/ext4/ext4.h  |  6 ++++--
 fs/ext4/super.c | 41 ++++++++++++++++++++++++++++++++---------
 2 files changed, 36 insertions(+), 11 deletions(-)

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 9a83f14..e164526 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -996,7 +996,7 @@ struct ext4_inode_info {
 #define EXT4_MOUNT_UPDATE_JOURNAL	0x01000	/* Update the journal format */
 #define EXT4_MOUNT_NO_UID32		0x02000  /* Disable 32-bit UIDs */
 #define EXT4_MOUNT_XATTR_USER		0x04000	/* Extended user attributes */
-#define EXT4_MOUNT_POSIX_ACL		0x08000	/* POSIX Access Control Lists */
+#define EXT4_MOUNT_ACL			0x08000	/* Access Control Lists */
 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC	0x10000	/* No auto delalloc mapping */
 #define EXT4_MOUNT_BARRIER		0x20000 /* Use block barriers */
 #define EXT4_MOUNT_QUOTA		0x80000 /* Some quota option set */
@@ -1593,6 +1593,7 @@ static inline int ext4_encrypted_inode(struct inode *inode)
 #define EXT4_FEATURE_INCOMPAT_LARGEDIR		0x4000 /* >2GB or 3-lvl htree */
 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA	0x8000 /* data in inode */
 #define EXT4_FEATURE_INCOMPAT_ENCRYPT		0x10000
+#define EXT4_FEATURE_INCOMPAT_RICHACL		0x20000
 
 #define EXT2_FEATURE_COMPAT_SUPP	EXT4_FEATURE_COMPAT_EXT_ATTR
 #define EXT2_FEATURE_INCOMPAT_SUPP	(EXT4_FEATURE_INCOMPAT_FILETYPE| \
@@ -1618,7 +1619,8 @@ static inline int ext4_encrypted_inode(struct inode *inode)
 					 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
 					 EXT4_FEATURE_INCOMPAT_MMP | \
 					 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
-					 EXT4_FEATURE_INCOMPAT_ENCRYPT)
+					 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
+					 EXT4_FEATURE_INCOMPAT_RICHACL)
 #define EXT4_FEATURE_RO_COMPAT_SUPP	(EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 					 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
 					 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index ca9d4a2..e601996 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1231,6 +1231,27 @@ static ext4_fsblk_t get_sb_block(void **data)
 	return sb_block;
 }
 
+static int enable_acl(struct super_block *sb)
+{
+	sb->s_flags &= ~(MS_POSIXACL | MS_RICHACL);
+	if (test_opt(sb, ACL)) {
+		if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RICHACL)) {
+#ifdef CONFIG_EXT4_FS_RICHACL
+			sb->s_flags |= MS_RICHACL;
+#else
+			return -EOPNOTSUPP;
+#endif
+		} else {
+#ifdef CONFIG_EXT4_FS_POSIX_ACL
+			sb->s_flags |= MS_POSIXACL;
+#else
+			return -EOPNOTSUPP;
+#endif
+		}
+	}
+	return 0;
+}
+
 #define DEFAULT_JOURNAL_IOPRIO (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, 3))
 static char deprecated_msg[] = "Mount option \"%s\" will be removed by %s\n"
 	"Contact linux-ext4@vger.kernel.org if you think we should keep it.\n";
@@ -1377,9 +1398,9 @@ static const struct mount_opts {
 	 MOPT_NO_EXT2 | MOPT_DATAJ},
 	{Opt_user_xattr, EXT4_MOUNT_XATTR_USER, MOPT_SET},
 	{Opt_nouser_xattr, EXT4_MOUNT_XATTR_USER, MOPT_CLEAR},
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
-	{Opt_acl, EXT4_MOUNT_POSIX_ACL, MOPT_SET},
-	{Opt_noacl, EXT4_MOUNT_POSIX_ACL, MOPT_CLEAR},
+#if defined(CONFIG_EXT4_FS_POSIX_ACL) || defined(CONFIG_EXT4_FS_RICHACL)
+	{Opt_acl, EXT4_MOUNT_ACL, MOPT_SET},
+	{Opt_noacl, EXT4_MOUNT_ACL, MOPT_CLEAR},
 #else
 	{Opt_acl, 0, MOPT_NOSUPPORT},
 	{Opt_noacl, 0, MOPT_NOSUPPORT},
@@ -3544,8 +3565,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		set_opt(sb, NO_UID32);
 	/* xattr user namespace & acls are now defaulted on */
 	set_opt(sb, XATTR_USER);
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
-	set_opt(sb, POSIX_ACL);
+#if defined(CONFIG_EXT4_FS_POSIX_ACL) || defined(CONFIG_EXT4_FS_RICHACL)
+	set_opt(sb, ACL);
 #endif
 	/* don't forget to enable journal_csum when metadata_csum is enabled. */
 	if (ext4_has_metadata_csum(sb))
@@ -3626,8 +3647,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 			clear_opt(sb, DELALLOC);
 	}
 
-	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
-		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+	err = enable_acl(sb);
+	if (err)
+		goto failed_mount;
 
 	if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV &&
 	    (EXT4_HAS_COMPAT_FEATURE(sb, ~0U) ||
@@ -4933,8 +4955,9 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 	if (sbi->s_mount_flags & EXT4_MF_FS_ABORTED)
 		ext4_abort(sb, "Abort forced by user");
 
-	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
-		(test_opt(sb, POSIX_ACL) ? MS_POSIXACL : 0);
+	err = enable_acl(sb);
+	if (err)
+		goto restore_opts;
 
 	es = sbi->s_es;
 
-- 
2.4.2

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Thread

[RFC v4 00/31] Richacls Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:00 +0200
  [RFC v4 20/31] richacl: acl editing helper functions Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:00 +0200
  [RFC v4 22/31] richacl: Propagate everyone@ permissions to other aces Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:00 +0200
  [RFC v4 23/31] richacl: Set the owner permissions to the owner mask Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:00 +0200
  [RFC v4 04/31] vfs: Make the inode passed to inode_change_ok non-const Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:00 +0200
  [RFC v4 26/31] richacl: Apply the file masks to a richacl Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:00 +0200
  [RFC v4 19/31] ext4: Add richacl feature flag Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 18/31] ext4: Add richacl support Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 14/31] richacl: Create-time inheritance Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 08/31] richacl: Compute maximum file masks from an acl Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 25/31] richacl: Isolate the owner and group classes Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 06/31] richacl: In-memory representation and helper functions Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
    Re: [RFC v4 06/31] richacl: In-memory representation and helper functions "Stefan (metze) Metzmacher" <metze@samba.org> - 2015-06-25 23:50 +0200
  [RFC v4 03/31] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD permission flags Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 16/31] richacl: xattr mapping functions Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 05/31] vfs: Add permission flags for setting file attributes Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 31/31] nfsd: Add support for the v4.1 dacl attribute Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 09/31] richacl: Update the file masks in chmod() Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 12/31] vfs: Cache richacl in struct inode Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 30/31] nfsd: Add richacl support Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 11/31] vfs: Cache base_acl objects in inodes Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 07/31] richacl: Permission mapping functions Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 13/31] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 01/31] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 17/31] vfs: Add richacl permission checking Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200
  [RFC v4 15/31] richacl: Automatic Inheritance Andreas Gruenbacher <andreas.gruenbacher@gmail.com> - 2015-06-25 00:10 +0200

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