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, 99 insertions, 0 deletions

diff --git a/fs/bcachefs/fs.h b/fs/bcachefs/fs.h
new file mode 100644
index 000000000000..e8dd566285fc
--- /dev/null
+++ b/fs/bcachefs/fs.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BCACHEFS_FS_H
+#define _BCACHEFS_FS_H
+
+#include "opts.h"
+#include "str_hash.h"
+#include "quota_types.h"
+
+#include <linux/seqlock.h>
+#include <linux/stat.h>
+
+/*
+ * Two-state lock - can be taken for add or block - both states are shared,
+ * like read side of rwsem, but conflict with other state:
+ */
+struct pagecache_lock {
+	atomic_long_t		v;
+	wait_queue_head_t	wait;
+};
+
+static inline void pagecache_lock_init(struct pagecache_lock *lock)
+{
+	atomic_long_set(&lock->v, 0);
+	init_waitqueue_head(&lock->wait);
+}
+
+void bch2_pagecache_add_put(struct pagecache_lock *);
+void bch2_pagecache_add_get(struct pagecache_lock *);
+void bch2_pagecache_block_put(struct pagecache_lock *);
+void bch2_pagecache_block_get(struct pagecache_lock *);
+
+struct bch_inode_info {
+	struct inode		v;
+
+	struct mutex		ei_update_lock;
+	u64			ei_journal_seq;
+	u64			ei_quota_reserved;
+	unsigned long		ei_last_dirtied;
+	struct pagecache_lock	ei_pagecache_lock;
+
+	struct mutex		ei_quota_lock;
+	struct bch_qid		ei_qid;
+
+	struct bch_hash_info	ei_str_hash;
+
+	/* copy of inode in btree: */
+	struct bch_inode_unpacked ei_inode;
+};
+
+#define to_bch_ei(_inode)					\
+	container_of_or_null(_inode, struct bch_inode_info, v)
+
+static inline struct bch_inode_info *file_bch_inode(struct file *file)
+{
+	return to_bch_ei(file_inode(file));
+}
+
+static inline u8 mode_to_type(umode_t mode)
+{
+	return (mode >> 12) & 15;
+}
+
+static inline unsigned nlink_bias(umode_t mode)
+{
+	return S_ISDIR(mode) ? 2 : 1;
+}
+
+struct bch_inode_unpacked;
+
+#ifndef NO_BCACHEFS_FS
+
+/* returns 0 if we want to do the update, or error is passed up */
+typedef int (*inode_set_fn)(struct bch_inode_info *,
+			    struct bch_inode_unpacked *, void *);
+
+void bch2_inode_update_after_write(struct bch_fs *,
+				   struct bch_inode_info *,
+				   struct bch_inode_unpacked *,
+				   unsigned);
+int __must_check bch2_write_inode_trans(struct btree_trans *,
+				struct bch_inode_info *,
+				struct bch_inode_unpacked *,
+				inode_set_fn, void *);
+int __must_check __bch2_write_inode(struct bch_fs *, struct bch_inode_info *,
+				    inode_set_fn, void *, unsigned);
+int __must_check bch2_write_inode(struct bch_fs *,
+				  struct bch_inode_info *);
+
+void bch2_vfs_exit(void);
+int bch2_vfs_init(void);
+
+#else
+
+static inline void bch2_vfs_exit(void) {}
+static inline int bch2_vfs_init(void) { return 0; }
+
+#endif /* NO_BCACHEFS_FS */
+
+#endif /* _BCACHEFS_FS_H */