nilfs2: move ioctl interface and disk layout to uapi separately

The header file "include/linux/nilfs2_fs.h" is composed of parts for
ioctl and disk format, and both are intended to be shared with user
space programs.

This moves them to the uapi directory "include/uapi/linux" splitting the
file to "nilfs2_api.h" and "nilfs2_ondisk.h".  The following minor
changes are accompanied by this migration:

 - nilfs_direct_node struct in nilfs2/direct.h is converged to
   nilfs2_ondisk.h because it's an on-disk structure.
 - inline functions nilfs_rec_len_from_disk() and
   nilfs_rec_len_to_disk() are moved to nilfs2/dir.c.

Link: http://lkml.kernel.org/r/1465825507-3407-4-git-send-email-konishi.ryusuke@lab.ntt.co.jp
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 292 insertions, 0 deletions

diff --git a/include/uapi/linux/nilfs2_api.h b/include/uapi/linux/nilfs2_api.h
new file mode 100644
index 000000000000..ef4c1de89b11
--- /dev/null
+++ b/include/uapi/linux/nilfs2_api.h
@@ -0,0 +1,292 @@
+/*
+ * nilfs2_api.h - NILFS2 user space API
+ *
+ * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef _LINUX_NILFS2_API_H
+#define _LINUX_NILFS2_API_H
+
+#include <linux/types.h>
+#include <linux/ioctl.h>
+
+/**
+ * struct nilfs_cpinfo - checkpoint information
+ * @ci_flags: flags
+ * @ci_pad: padding
+ * @ci_cno: checkpoint number
+ * @ci_create: creation timestamp
+ * @ci_nblk_inc: number of blocks incremented by this checkpoint
+ * @ci_inodes_count: inodes count
+ * @ci_blocks_count: blocks count
+ * @ci_next: next checkpoint number in snapshot list
+ */
+struct nilfs_cpinfo {
+	__u32 ci_flags;
+	__u32 ci_pad;
+	__u64 ci_cno;
+	__u64 ci_create;
+	__u64 ci_nblk_inc;
+	__u64 ci_inodes_count;
+	__u64 ci_blocks_count;
+	__u64 ci_next;
+};
+
+/* checkpoint flags */
+enum {
+	NILFS_CPINFO_SNAPSHOT,
+	NILFS_CPINFO_INVALID,
+	NILFS_CPINFO_SKETCH,
+	NILFS_CPINFO_MINOR,
+};
+
+#define NILFS_CPINFO_FNS(flag, name)					\
+static inline int							\
+nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo)			\
+{									\
+	return !!(cpinfo->ci_flags & (1UL << NILFS_CPINFO_##flag));	\
+}
+
+NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
+NILFS_CPINFO_FNS(INVALID, invalid)
+NILFS_CPINFO_FNS(MINOR, minor)
+
+/**
+ * nilfs_suinfo - segment usage information
+ * @sui_lastmod: timestamp of last modification
+ * @sui_nblocks: number of written blocks in segment
+ * @sui_flags: segment usage flags
+ */
+struct nilfs_suinfo {
+	__u64 sui_lastmod;
+	__u32 sui_nblocks;
+	__u32 sui_flags;
+};
+
+/* segment usage flags */
+enum {
+	NILFS_SUINFO_ACTIVE,
+	NILFS_SUINFO_DIRTY,
+	NILFS_SUINFO_ERROR,
+};
+
+#define NILFS_SUINFO_FNS(flag, name)					\
+static inline int							\
+nilfs_suinfo_##name(const struct nilfs_suinfo *si)			\
+{									\
+	return si->sui_flags & (1UL << NILFS_SUINFO_##flag);		\
+}
+
+NILFS_SUINFO_FNS(ACTIVE, active)
+NILFS_SUINFO_FNS(DIRTY, dirty)
+NILFS_SUINFO_FNS(ERROR, error)
+
+static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
+{
+	return !si->sui_flags;
+}
+
+/**
+ * nilfs_suinfo_update - segment usage information update
+ * @sup_segnum: segment number
+ * @sup_flags: flags for which fields are active in sup_sui
+ * @sup_reserved: reserved necessary for alignment
+ * @sup_sui: segment usage information
+ */
+struct nilfs_suinfo_update {
+	__u64 sup_segnum;
+	__u32 sup_flags;
+	__u32 sup_reserved;
+	struct nilfs_suinfo sup_sui;
+};
+
+enum {
+	NILFS_SUINFO_UPDATE_LASTMOD,
+	NILFS_SUINFO_UPDATE_NBLOCKS,
+	NILFS_SUINFO_UPDATE_FLAGS,
+	__NR_NILFS_SUINFO_UPDATE_FIELDS,
+};
+
+#define NILFS_SUINFO_UPDATE_FNS(flag, name)				\
+static inline void							\
+nilfs_suinfo_update_set_##name(struct nilfs_suinfo_update *sup)		\
+{									\
+	sup->sup_flags |= 1UL << NILFS_SUINFO_UPDATE_##flag;		\
+}									\
+static inline void							\
+nilfs_suinfo_update_clear_##name(struct nilfs_suinfo_update *sup)	\
+{									\
+	sup->sup_flags &= ~(1UL << NILFS_SUINFO_UPDATE_##flag);		\
+}									\
+static inline int							\
+nilfs_suinfo_update_##name(const struct nilfs_suinfo_update *sup)	\
+{									\
+	return !!(sup->sup_flags & (1UL << NILFS_SUINFO_UPDATE_##flag));\
+}
+
+NILFS_SUINFO_UPDATE_FNS(LASTMOD, lastmod)
+NILFS_SUINFO_UPDATE_FNS(NBLOCKS, nblocks)
+NILFS_SUINFO_UPDATE_FNS(FLAGS, flags)
+
+enum {
+	NILFS_CHECKPOINT,
+	NILFS_SNAPSHOT,
+};
+
+/**
+ * struct nilfs_cpmode - change checkpoint mode structure
+ * @cm_cno: checkpoint number
+ * @cm_mode: mode of checkpoint
+ * @cm_pad: padding
+ */
+struct nilfs_cpmode {
+	__u64 cm_cno;
+	__u32 cm_mode;
+	__u32 cm_pad;
+};
+
+/**
+ * struct nilfs_argv - argument vector
+ * @v_base: pointer on data array from userspace
+ * @v_nmembs: number of members in data array
+ * @v_size: size of data array in bytes
+ * @v_flags: flags
+ * @v_index: start number of target data items
+ */
+struct nilfs_argv {
+	__u64 v_base;
+	__u32 v_nmembs;	/* number of members */
+	__u16 v_size;	/* size of members */
+	__u16 v_flags;
+	__u64 v_index;
+};
+
+/**
+ * struct nilfs_period - period of checkpoint numbers
+ * @p_start: start checkpoint number (inclusive)
+ * @p_end: end checkpoint number (exclusive)
+ */
+struct nilfs_period {
+	__u64 p_start;
+	__u64 p_end;
+};
+
+/**
+ * struct nilfs_cpstat - checkpoint statistics
+ * @cs_cno: checkpoint number
+ * @cs_ncps: number of checkpoints
+ * @cs_nsss: number of snapshots
+ */
+struct nilfs_cpstat {
+	__u64 cs_cno;
+	__u64 cs_ncps;
+	__u64 cs_nsss;
+};
+
+/**
+ * struct nilfs_sustat - segment usage statistics
+ * @ss_nsegs: number of segments
+ * @ss_ncleansegs: number of clean segments
+ * @ss_ndirtysegs: number of dirty segments
+ * @ss_ctime: creation time of the last segment
+ * @ss_nongc_ctime: creation time of the last segment not for GC
+ * @ss_prot_seq: least sequence number of segments which must not be reclaimed
+ */
+struct nilfs_sustat {
+	__u64 ss_nsegs;
+	__u64 ss_ncleansegs;
+	__u64 ss_ndirtysegs;
+	__u64 ss_ctime;
+	__u64 ss_nongc_ctime;
+	__u64 ss_prot_seq;
+};
+
+/**
+ * struct nilfs_vinfo - virtual block number information
+ * @vi_vblocknr: virtual block number
+ * @vi_start: start checkpoint number (inclusive)
+ * @vi_end: end checkpoint number (exclusive)
+ * @vi_blocknr: disk block number
+ */
+struct nilfs_vinfo {
+	__u64 vi_vblocknr;
+	__u64 vi_start;
+	__u64 vi_end;
+	__u64 vi_blocknr;
+};
+
+/**
+ * struct nilfs_vdesc - descriptor of virtual block number
+ * @vd_ino: inode number
+ * @vd_cno: checkpoint number
+ * @vd_vblocknr: virtual block number
+ * @vd_period: period of checkpoint numbers
+ * @vd_blocknr: disk block number
+ * @vd_offset: logical block offset inside a file
+ * @vd_flags: flags (data or node block)
+ * @vd_pad: padding
+ */
+struct nilfs_vdesc {
+	__u64 vd_ino;
+	__u64 vd_cno;
+	__u64 vd_vblocknr;
+	struct nilfs_period vd_period;
+	__u64 vd_blocknr;
+	__u64 vd_offset;
+	__u32 vd_flags;
+	__u32 vd_pad;
+};
+
+/**
+ * struct nilfs_bdesc - descriptor of disk block number
+ * @bd_ino: inode number
+ * @bd_oblocknr: disk block address (for skipping dead blocks)
+ * @bd_blocknr: disk block address
+ * @bd_offset: logical block offset inside a file
+ * @bd_level: level in the b-tree organization
+ * @bd_pad: padding
+ */
+struct nilfs_bdesc {
+	__u64 bd_ino;
+	__u64 bd_oblocknr;
+	__u64 bd_blocknr;
+	__u64 bd_offset;
+	__u32 bd_level;
+	__u32 bd_pad;
+};
+
+#define NILFS_IOCTL_IDENT	'n'
+
+#define NILFS_IOCTL_CHANGE_CPMODE					\
+	_IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
+#define NILFS_IOCTL_DELETE_CHECKPOINT					\
+	_IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
+#define NILFS_IOCTL_GET_CPINFO						\
+	_IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
+#define NILFS_IOCTL_GET_CPSTAT						\
+	_IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
+#define NILFS_IOCTL_GET_SUINFO						\
+	_IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
+#define NILFS_IOCTL_GET_SUSTAT						\
+	_IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
+#define NILFS_IOCTL_GET_VINFO						\
+	_IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
+#define NILFS_IOCTL_GET_BDESCS						\
+	_IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
+#define NILFS_IOCTL_CLEAN_SEGMENTS					\
+	_IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
+#define NILFS_IOCTL_SYNC						\
+	_IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
+#define NILFS_IOCTL_RESIZE						\
+	_IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
+#define NILFS_IOCTL_SET_ALLOC_RANGE					\
+	_IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2])
+#define NILFS_IOCTL_SET_SUINFO						\
+	_IOW(NILFS_IOCTL_IDENT, 0x8D, struct nilfs_argv)
+
+#endif /* _LINUX_NILFS2_API_H */