staging: erofs: introduce xattr & acl support
This implements xattr and acl functionalities.
Inline and shared xattrs are introduced for flexibility.
Specifically, if the same xattr occurs for many times
in a large number of inodes or the value of a xattr is so large
that it isn't suitable to be inlined, a shared xattr
kept in the xattr meta will be used instead.
Signed-off-by: Miao Xie <miaoxie@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
index 98ae03d..4a8a266 100644
--- a/drivers/staging/erofs/super.c
+++ b/drivers/staging/erofs/super.c
@@ -14,6 +14,7 @@
#include <linux/buffer_head.h>
#include <linux/statfs.h>
#include <linux/parser.h>
+#include <linux/seq_file.h>
#include "internal.h"
static struct kmem_cache *erofs_inode_cachep __read_mostly;
@@ -107,6 +108,9 @@ static int superblock_read(struct super_block *sb)
sbi->blocks = le32_to_cpu(layout->blocks);
sbi->meta_blkaddr = le32_to_cpu(layout->meta_blkaddr);
+#ifdef CONFIG_EROFS_FS_XATTR
+ sbi->xattr_blkaddr = le32_to_cpu(layout->xattr_blkaddr);
+#endif
sbi->islotbits = ffs(sizeof(struct erofs_inode_v1)) - 1;
sbi->root_nid = le16_to_cpu(layout->root_nid);
@@ -127,13 +131,28 @@ static int superblock_read(struct super_block *sb)
static void default_options(struct erofs_sb_info *sbi)
{
+#ifdef CONFIG_EROFS_FS_XATTR
+ set_opt(sbi, XATTR_USER);
+#endif
+
+#ifdef CONFIG_EROFS_FS_POSIX_ACL
+ set_opt(sbi, POSIX_ACL);
+#endif
}
enum {
+ Opt_user_xattr,
+ Opt_nouser_xattr,
+ Opt_acl,
+ Opt_noacl,
Opt_err
};
static match_table_t erofs_tokens = {
+ {Opt_user_xattr, "user_xattr"},
+ {Opt_nouser_xattr, "nouser_xattr"},
+ {Opt_acl, "acl"},
+ {Opt_noacl, "noacl"},
{Opt_err, NULL}
};
@@ -155,6 +174,36 @@ static int parse_options(struct super_block *sb, char *options)
token = match_token(p, erofs_tokens, args);
switch (token) {
+#ifdef CONFIG_EROFS_FS_XATTR
+ case Opt_user_xattr:
+ set_opt(EROFS_SB(sb), XATTR_USER);
+ break;
+ case Opt_nouser_xattr:
+ clear_opt(EROFS_SB(sb), XATTR_USER);
+ break;
+#else
+ case Opt_user_xattr:
+ infoln("user_xattr options not supported");
+ break;
+ case Opt_nouser_xattr:
+ infoln("nouser_xattr options not supported");
+ break;
+#endif
+#ifdef CONFIG_EROFS_FS_POSIX_ACL
+ case Opt_acl:
+ set_opt(EROFS_SB(sb), POSIX_ACL);
+ break;
+ case Opt_noacl:
+ clear_opt(EROFS_SB(sb), POSIX_ACL);
+ break;
+#else
+ case Opt_acl:
+ infoln("acl options not supported");
+ break;
+ case Opt_noacl:
+ infoln("noacl options not supported");
+ break;
+#endif
default:
errln("Unrecognized mount option \"%s\" "
"or missing value", p);
@@ -197,6 +246,10 @@ static int erofs_read_super(struct super_block *sb,
sb->s_op = &erofs_sops;
+#ifdef CONFIG_EROFS_FS_XATTR
+ sb->s_xattr = erofs_xattr_handlers;
+#endif
+
/* set erofs default mount options */
default_options(sbi);
@@ -386,6 +439,20 @@ static int erofs_statfs(struct dentry *dentry, struct kstatfs *buf)
static int erofs_show_options(struct seq_file *seq, struct dentry *root)
{
+ struct erofs_sb_info *sbi __maybe_unused = EROFS_SB(root->d_sb);
+
+#ifdef CONFIG_EROFS_FS_XATTR
+ if (test_opt(sbi, XATTR_USER))
+ seq_puts(seq, ",user_xattr");
+ else
+ seq_puts(seq, ",nouser_xattr");
+#endif
+#ifdef CONFIG_EROFS_FS_POSIX_ACL
+ if (test_opt(sbi, POSIX_ACL))
+ seq_puts(seq, ",acl");
+ else
+ seq_puts(seq, ",noacl");
+#endif
return 0;
}
