bcachefs: Fixes for building in userspace

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

fs/bcachefs/checksum.c

@@ -559,6 +559,26 @@ int bch2_request_key(struct bch_sb *sb, struct bch_key *key)
 	return ret;
 }
 
+#ifndef __KERNEL__
+int bch2_revoke_key(struct bch_sb *sb)
+{
+	key_serial_t key_id;
+	struct printbuf key_description = PRINTBUF;
+
+	prt_printf(&key_description, "bcachefs:");
+	pr_uuid(&key_description, sb->user_uuid.b);
+
+	key_id = request_key("user", key_description.buf, NULL, KEY_SPEC_USER_KEYRING);
+	printbuf_exit(&key_description);
+	if (key_id < 0)
+		return errno;
+
+	keyctl_revoke(key_id);
+
+	return 0;
+}
+#endif
+
 int bch2_decrypt_sb_key(struct bch_fs *c,
 			struct bch_sb_field_crypt *crypt,
 			struct bch_key *key)

fs/bcachefs/checksum.h

@@ -47,6 +47,9 @@ struct bch_csum bch2_checksum(struct bch_fs *, unsigned, struct nonce,
 
 int bch2_chacha_encrypt_key(struct bch_key *, struct nonce, void *, size_t);
 int bch2_request_key(struct bch_sb *, struct bch_key *);
+#ifndef __KERNEL__
+int bch2_revoke_key(struct bch_sb *);
+#endif
 
 int bch2_encrypt(struct bch_fs *, unsigned, struct nonce,
 		 void *data, size_t);

fs/bcachefs/fs.h

@@ -197,7 +197,7 @@ int bch2_vfs_init(void);
 
 #else
 
-#define bch2_inode_update_after_write(_trans, _inode, _inode_u, _fields)	do {} while (0)
+#define bch2_inode_update_after_write(_trans, _inode, _inode_u, _fields)	({ do {} while (0); })
 
 static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
 					       snapshot_id_list *s) {}

fs/bcachefs/io_read.c

@@ -24,6 +24,8 @@
 #include "subvolume.h"
 #include "trace.h"
 
+#include <linux/sched/mm.h>
+
 #ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT
 
 static bool bch2_target_congested(struct bch_fs *c, u16 target)

fs/bcachefs/super-io.c

@@ -675,7 +675,7 @@ int bch2_read_super(const char *path, struct bch_opts *opts,
 
 #ifndef __KERNEL__
 	if (opt_get(*opts, direct_io) == false)
-		sb->mode |= FMODE_BUFFERED;
+		sb->mode |= BLK_OPEN_BUFFERED;
 #endif
 
 	if (!opt_get(*opts, noexcl))