bcachefs: Initial commit

Initially forked from drivers/md/bcache, bcachefs is a new copy-on-write
filesystem with every feature you could possibly want.

Website: https://bcachefs.org

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 49 insertions, 0 deletions

diff --git a/fs/bcachefs/xattr.h b/fs/bcachefs/xattr.h
new file mode 100644
index 000000000000..0e7d2fa86213
--- /dev/null
+++ b/fs/bcachefs/xattr.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_XATTR_H
+#define _BCACHEFS_XATTR_H
+
+#include "str_hash.h"
+
+extern const struct bch_hash_desc bch2_xattr_hash_desc;
+
+const char *bch2_xattr_invalid(const struct bch_fs *, struct bkey_s_c);
+void bch2_xattr_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+
+#define bch2_bkey_xattr_ops (struct bkey_ops) {		\
+	.key_invalid	= bch2_xattr_invalid,		\
+	.val_to_text	= bch2_xattr_to_text,		\
+}
+
+static inline unsigned xattr_val_u64s(unsigned name_len, unsigned val_len)
+{
+	return DIV_ROUND_UP(offsetof(struct bch_xattr, x_name) +
+			    name_len + val_len, sizeof(u64));
+}
+
+#define xattr_val(_xattr)					\
+	((void *) (_xattr)->x_name + (_xattr)->x_name_len)
+
+struct xattr_search_key {
+	u8		type;
+	struct qstr	name;
+};
+
+#define X_SEARCH(_type, _name, _len) ((struct xattr_search_key)	\
+	{ .type = _type, .name = QSTR_INIT(_name, _len) })
+
+struct dentry;
+struct xattr_handler;
+struct bch_hash_info;
+struct bch_inode_info;
+
+int bch2_xattr_get(struct bch_fs *, struct bch_inode_info *,
+		  const char *, void *, size_t, int);
+
+int bch2_xattr_set(struct btree_trans *, u64, const struct bch_hash_info *,
+		   const char *, const void *, size_t, int, int);
+
+ssize_t bch2_xattr_list(struct dentry *, char *, size_t);
+
+extern const struct xattr_handler *bch2_xattr_handlers[];
+
+#endif /* _BCACHEFS_XATTR_H */