Commit 7ffc4daa authored by Kent Overstreet's avatar Kent Overstreet
Browse files

bcachefs: dirent_format.h 



Signed-off-by: default avatarKent Overstreet <kent.overstreet@linux.dev>
parent b36425da

fs/bcachefs/bcachefs_format.h

+1 −39
Original line number Diff line number Diff line
@@ -710,45 +710,6 @@ struct bch_reservation { 
#define BKEY_BTREE_PTR_U64s_MAX					\

	(BKEY_U64s + BKEY_BTREE_PTR_VAL_U64s_MAX)



/* Dirents */



/*

 * Dirents (and xattrs) have to implement string lookups; since our b-tree

 * doesn't support arbitrary length strings for the key, we instead index by a

 * 64 bit hash (currently truncated sha1) of the string, stored in the offset

 * field of the key - using linear probing to resolve hash collisions. This also

 * provides us with the readdir cookie posix requires.

 *

 * Linear probing requires us to use whiteouts for deletions, in the event of a

 * collision:

 */



struct bch_dirent {

	struct bch_val		v;



	/* Target inode number: */

	union {

	__le64			d_inum;

	struct {		/* DT_SUBVOL */

	__le32			d_child_subvol;

	__le32			d_parent_subvol;

	};

	};



	/*

	 * Copy of mode bits 12-15 from the target inode - so userspace can get

	 * the filetype without having to do a stat()

	 */

	__u8			d_type;



	__u8			d_name[];

} __packed __aligned(8);



#define DT_SUBVOL	16

#define BCH_DT_MAX	17



#define BCH_NAME_MAX	512



/* Xattrs */



#define KEY_TYPE_XATTR_INDEX_USER			0
@@ -1045,6 +1006,7 @@ struct bch_sb_field { 
	x(ext,				13)	\

	x(downgrade,			14)



#include "dirent_format.h"

#include "inode_format.h"

#include "quota_format.h"

#include "sb-counters_format.h"

fs/bcachefs/dirent_format.h

0 → 100644
+42 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _BCACHEFS_DIRENT_FORMAT_H

#define _BCACHEFS_DIRENT_FORMAT_H



/*

 * Dirents (and xattrs) have to implement string lookups; since our b-tree

 * doesn't support arbitrary length strings for the key, we instead index by a

 * 64 bit hash (currently truncated sha1) of the string, stored in the offset

 * field of the key - using linear probing to resolve hash collisions. This also

 * provides us with the readdir cookie posix requires.

 *

 * Linear probing requires us to use whiteouts for deletions, in the event of a

 * collision:

 */



struct bch_dirent {

	struct bch_val		v;



	/* Target inode number: */

	union {

	__le64			d_inum;

	struct {		/* DT_SUBVOL */

	__le32			d_child_subvol;

	__le32			d_parent_subvol;

	};

	};



	/*

	 * Copy of mode bits 12-15 from the target inode - so userspace can get

	 * the filetype without having to do a stat()

	 */

	__u8			d_type;



	__u8			d_name[];

} __packed __aligned(8);



#define DT_SUBVOL	16

#define BCH_DT_MAX	17



#define BCH_NAME_MAX	512



#endif /* _BCACHEFS_DIRENT_FORMAT_H */