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Subject[PATCH -V2 16/16] ext4: Add temporary richacl mount option for ext4.
Date
This helps in easy testing of the patchset. The mount
option will be later removed in favour of a feature flag.

***Should be folded before merging***

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/ext4/ext4.h | 1 +
fs/ext4/super.c | 54 ++++++++++++++++++++++++++++++++++++++++++------------
2 files changed, 43 insertions(+), 12 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 966d0cb..d54cd0c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -888,6 +888,7 @@ struct ext4_inode_info {
#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
#define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
+#define EXT4_MOUNT_RICHACL 0x80000000 /* Temp richacl enable */

#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
#define set_opt(o, opt) o |= EXT4_MOUNT_##opt
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 520ab44..c5861c9 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -932,6 +932,10 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
if (!(sb->s_flags & MS_POSIXACL) && (def_mount_opts & EXT4_DEFM_ACL))
seq_puts(seq, ",noacl");
#endif
+#ifdef CONFIG_EXT4_FS_RICHACL
+ if (sb->s_flags & MS_RICHACL)
+ seq_puts(seq, ",richacl");
+#endif
if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
seq_printf(seq, ",commit=%u",
(unsigned) (sbi->s_commit_interval / HZ));
@@ -1170,7 +1174,7 @@ enum {
Opt_block_validity, Opt_noblock_validity,
Opt_inode_readahead_blks, Opt_journal_ioprio,
Opt_dioread_nolock, Opt_dioread_lock,
- Opt_discard, Opt_nodiscard,
+ Opt_discard, Opt_nodiscard, Opt_richacl,
};

static const match_table_t tokens = {
@@ -1241,6 +1245,7 @@ static const match_table_t tokens = {
{Opt_dioread_lock, "dioread_lock"},
{Opt_discard, "discard"},
{Opt_nodiscard, "nodiscard"},
+ {Opt_richacl, "richacl"},
{Opt_err, NULL},
};

@@ -1267,6 +1272,35 @@ static ext4_fsblk_t get_sb_block(void **data)
return sb_block;
}

+static void enable_acl(struct super_block *sb)
+{
+#if !defined(CONFIG_EXT4_FS_POSIX_ACL)
+ ext4_msg(sb, KERN_ERR, "acl options not supported");
+ return;
+#endif
+ sb->s_flags |= MS_POSIXACL;
+}
+
+static void disable_acl(struct super_block *sb)
+{
+#if !defined(CONFIG_EXT4_FS_POSIX_ACL)
+ ext4_msg(sb, KERN_ERR, "acl options not supported");
+ return;
+#endif
+ sb->s_flags &= ~MS_POSIXACL;
+ return;
+}
+
+static void enable_richacl(struct super_block *sb)
+{
+#if !defined(CONFIG_EXT4_FS_RICHACL)
+ ext4_msg(sb, KERN_ERR, "richacl options not supported");
+ return;
+#endif
+ sb->s_flags |= MS_RICHACL;
+ return;
+}
+
#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";
@@ -1431,19 +1465,12 @@ static int parse_options(char *options, struct super_block *sb,
ext4_msg(sb, KERN_ERR, "(no)user_xattr options not supported");
break;
#endif
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
case Opt_acl:
- sb->s_flags |= MS_POSIXACL;
+ enable_acl(sb);
break;
case Opt_noacl:
- sb->s_flags &= ~MS_POSIXACL;
+ disable_acl(sb);
break;
-#else
- case Opt_acl:
- case Opt_noacl:
- ext4_msg(sb, KERN_ERR, "(no)acl options not supported");
- break;
-#endif
case Opt_journal_update:
/* @@@ FIXME */
/* Eventually we will want to be able to create
@@ -1709,6 +1736,9 @@ set_qf_format:
case Opt_dioread_lock:
clear_opt(sbi->s_mount_opt, DIOREAD_NOLOCK);
break;
+ case Opt_richacl:
+ enable_richacl(sb);
+ break;
default:
ext4_msg(sb, KERN_ERR,
"Unrecognized mount option \"%s\" "
@@ -2539,9 +2569,9 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
if (def_mount_opts & EXT4_DEFM_XATTR_USER)
set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
-#ifdef CONFIG_EXT4_FS_POSIX_ACL
+#if defined(CONFIG_EXT4_FS_POSIX_ACL)
if (def_mount_opts & EXT4_DEFM_ACL)
- sb->s_flags |= MS_POSIXACL;
+ enable_acl(sb);
#endif
if ((def_mount_opts & EXT4_DEFM_JMODE) == EXT4_DEFM_JMODE_DATA)
set_opt(sbi->s_mount_opt, JOURNAL_DATA);
--
1.7.2.rc1


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