v4.19.13 snapshot.
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h
new file mode 100644
index 0000000..a2f247b
--- /dev/null
+++ b/fs/nilfs2/nilfs.h
@@ -0,0 +1,374 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * nilfs.h - NILFS local header file.
+ *
+ * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * Written by Koji Sato and Ryusuke Konishi.
+ */
+
+#ifndef _NILFS_H
+#define _NILFS_H
+
+#include <linux/kernel.h>
+#include <linux/buffer_head.h>
+#include <linux/spinlock.h>
+#include <linux/blkdev.h>
+#include <linux/nilfs2_api.h>
+#include <linux/nilfs2_ondisk.h>
+#include "the_nilfs.h"
+#include "bmap.h"
+
+/**
+ * struct nilfs_inode_info - nilfs inode data in memory
+ * @i_flags: inode flags
+ * @i_state: dynamic state flags
+ * @i_bmap: pointer on i_bmap_data
+ * @i_bmap_data: raw block mapping
+ * @i_xattr: <TODO>
+ * @i_dir_start_lookup: page index of last successful search
+ * @i_cno: checkpoint number for GC inode
+ * @i_btnode_cache: cached pages of b-tree nodes
+ * @i_dirty: list for connecting dirty files
+ * @xattr_sem: semaphore for extended attributes processing
+ * @i_bh: buffer contains disk inode
+ * @i_root: root object of the current filesystem tree
+ * @vfs_inode: VFS inode object
+ */
+struct nilfs_inode_info {
+ __u32 i_flags;
+ unsigned long i_state; /* Dynamic state flags */
+ struct nilfs_bmap *i_bmap;
+ struct nilfs_bmap i_bmap_data;
+ __u64 i_xattr; /* sector_t ??? */
+ __u32 i_dir_start_lookup;
+ __u64 i_cno; /* check point number for GC inode */
+ struct address_space i_btnode_cache;
+ struct list_head i_dirty; /* List for connecting dirty files */
+
+#ifdef CONFIG_NILFS_XATTR
+ /*
+ * Extended attributes can be read independently of the main file
+ * data. Taking i_sem even when reading would cause contention
+ * between readers of EAs and writers of regular file data, so
+ * instead we synchronize on xattr_sem when reading or changing
+ * EAs.
+ */
+ struct rw_semaphore xattr_sem;
+#endif
+ struct buffer_head *i_bh; /*
+ * i_bh contains a new or dirty
+ * disk inode.
+ */
+ struct nilfs_root *i_root;
+ struct inode vfs_inode;
+};
+
+static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
+{
+ return container_of(inode, struct nilfs_inode_info, vfs_inode);
+}
+
+static inline struct nilfs_inode_info *
+NILFS_BMAP_I(const struct nilfs_bmap *bmap)
+{
+ return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
+}
+
+static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
+{
+ struct nilfs_inode_info *ii =
+ container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
+ return &ii->vfs_inode;
+}
+
+/*
+ * Dynamic state flags of NILFS on-memory inode (i_state)
+ */
+enum {
+ NILFS_I_NEW = 0, /* Inode is newly created */
+ NILFS_I_DIRTY, /* The file is dirty */
+ NILFS_I_QUEUED, /* inode is in dirty_files list */
+ NILFS_I_BUSY, /*
+ * Inode is grabbed by a segment
+ * constructor
+ */
+ NILFS_I_COLLECTED, /* All dirty blocks are collected */
+ NILFS_I_UPDATED, /* The file has been written back */
+ NILFS_I_INODE_SYNC, /* dsync is not allowed for inode */
+ NILFS_I_BMAP, /* has bmap and btnode_cache */
+ NILFS_I_GCINODE, /* inode for GC, on memory only */
+};
+
+/*
+ * commit flags for nilfs_commit_super and nilfs_sync_super
+ */
+enum {
+ NILFS_SB_COMMIT = 0, /* Commit a super block alternately */
+ NILFS_SB_COMMIT_ALL /* Commit both super blocks */
+};
+
+/*
+ * Macros to check inode numbers
+ */
+#define NILFS_MDT_INO_BITS \
+ (BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) | \
+ BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) | \
+ BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO))
+
+#define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
+
+#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
+
+#define NILFS_MDT_INODE(sb, ino) \
+ ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino)))
+#define NILFS_VALID_INODE(sb, ino) \
+ ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino)))
+
+/**
+ * struct nilfs_transaction_info: context information for synchronization
+ * @ti_magic: Magic number
+ * @ti_save: Backup of journal_info field of task_struct
+ * @ti_flags: Flags
+ * @ti_count: Nest level
+ */
+struct nilfs_transaction_info {
+ u32 ti_magic;
+ void *ti_save;
+ /*
+ * This should never be used. If it happens,
+ * one of other filesystems has a bug.
+ */
+ unsigned short ti_flags;
+ unsigned short ti_count;
+};
+
+/* ti_magic */
+#define NILFS_TI_MAGIC 0xd9e392fb
+
+/* ti_flags */
+#define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
+#define NILFS_TI_SYNC 0x0002 /*
+ * Force to construct segment at the
+ * end of transaction.
+ */
+#define NILFS_TI_GC 0x0004 /* GC context */
+#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
+#define NILFS_TI_WRITER 0x0010 /* Constructor context */
+
+
+int nilfs_transaction_begin(struct super_block *,
+ struct nilfs_transaction_info *, int);
+int nilfs_transaction_commit(struct super_block *);
+void nilfs_transaction_abort(struct super_block *);
+
+static inline void nilfs_set_transaction_flag(unsigned int flag)
+{
+ struct nilfs_transaction_info *ti = current->journal_info;
+
+ ti->ti_flags |= flag;
+}
+
+static inline int nilfs_test_transaction_flag(unsigned int flag)
+{
+ struct nilfs_transaction_info *ti = current->journal_info;
+
+ if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
+ return 0;
+ return !!(ti->ti_flags & flag);
+}
+
+static inline int nilfs_doing_gc(void)
+{
+ return nilfs_test_transaction_flag(NILFS_TI_GC);
+}
+
+static inline int nilfs_doing_construction(void)
+{
+ return nilfs_test_transaction_flag(NILFS_TI_WRITER);
+}
+
+/*
+ * function prototype
+ */
+#ifdef CONFIG_NILFS_POSIX_ACL
+#error "NILFS: not yet supported POSIX ACL"
+extern int nilfs_acl_chmod(struct inode *);
+extern int nilfs_init_acl(struct inode *, struct inode *);
+#else
+static inline int nilfs_acl_chmod(struct inode *inode)
+{
+ return 0;
+}
+
+static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
+{
+ inode->i_mode &= ~current_umask();
+ return 0;
+}
+#endif
+
+#define NILFS_ATIME_DISABLE
+
+/* Flags that should be inherited by new inodes from their parent. */
+#define NILFS_FL_INHERITED \
+ (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \
+ FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
+ FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
+
+/* Mask out flags that are inappropriate for the given type of inode. */
+static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
+{
+ if (S_ISDIR(mode))
+ return flags;
+ else if (S_ISREG(mode))
+ return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
+ else
+ return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
+}
+
+/* dir.c */
+extern int nilfs_add_link(struct dentry *, struct inode *);
+extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
+extern int nilfs_make_empty(struct inode *, struct inode *);
+extern struct nilfs_dir_entry *
+nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
+extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
+extern int nilfs_empty_dir(struct inode *);
+extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
+extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
+ struct page *, struct inode *);
+
+/* file.c */
+extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
+
+/* ioctl.c */
+long nilfs_ioctl(struct file *, unsigned int, unsigned long);
+long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
+int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
+ void **);
+
+/* inode.c */
+void nilfs_inode_add_blocks(struct inode *inode, int n);
+void nilfs_inode_sub_blocks(struct inode *inode, int n);
+extern struct inode *nilfs_new_inode(struct inode *, umode_t);
+extern void nilfs_free_inode(struct inode *);
+extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
+extern void nilfs_set_inode_flags(struct inode *);
+extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
+extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
+struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
+ unsigned long ino);
+struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
+ unsigned long ino);
+struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
+ unsigned long ino);
+extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
+ unsigned long ino, __u64 cno);
+extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
+extern void nilfs_truncate(struct inode *);
+extern void nilfs_evict_inode(struct inode *);
+extern int nilfs_setattr(struct dentry *, struct iattr *);
+extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
+int nilfs_permission(struct inode *inode, int mask);
+int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
+extern int nilfs_inode_dirty(struct inode *);
+int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
+extern int __nilfs_mark_inode_dirty(struct inode *, int);
+extern void nilfs_dirty_inode(struct inode *, int flags);
+int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len);
+static inline int nilfs_mark_inode_dirty(struct inode *inode)
+{
+ return __nilfs_mark_inode_dirty(inode, I_DIRTY);
+}
+static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
+{
+ return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
+}
+
+/* super.c */
+extern struct inode *nilfs_alloc_inode(struct super_block *);
+extern void nilfs_destroy_inode(struct inode *);
+
+extern __printf(3, 4)
+void __nilfs_msg(struct super_block *sb, const char *level,
+ const char *fmt, ...);
+extern __printf(3, 4)
+void __nilfs_error(struct super_block *sb, const char *function,
+ const char *fmt, ...);
+
+#ifdef CONFIG_PRINTK
+
+#define nilfs_msg(sb, level, fmt, ...) \
+ __nilfs_msg(sb, level, fmt, ##__VA_ARGS__)
+#define nilfs_error(sb, fmt, ...) \
+ __nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)
+
+#else
+
+#define nilfs_msg(sb, level, fmt, ...) \
+ do { \
+ no_printk(fmt, ##__VA_ARGS__); \
+ (void)(sb); \
+ } while (0)
+#define nilfs_error(sb, fmt, ...) \
+ do { \
+ no_printk(fmt, ##__VA_ARGS__); \
+ __nilfs_error(sb, "", " "); \
+ } while (0)
+
+#endif /* CONFIG_PRINTK */
+
+extern struct nilfs_super_block *
+nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
+extern int nilfs_store_magic_and_option(struct super_block *,
+ struct nilfs_super_block *, char *);
+extern int nilfs_check_feature_compatibility(struct super_block *,
+ struct nilfs_super_block *);
+extern void nilfs_set_log_cursor(struct nilfs_super_block *,
+ struct the_nilfs *);
+struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
+ int flip);
+int nilfs_commit_super(struct super_block *sb, int flag);
+int nilfs_cleanup_super(struct super_block *sb);
+int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
+int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
+ struct nilfs_root **root);
+int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
+
+/* gcinode.c */
+int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
+ struct buffer_head **);
+int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
+ struct buffer_head **);
+int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
+int nilfs_init_gcinode(struct inode *inode);
+void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
+
+/* sysfs.c */
+int __init nilfs_sysfs_init(void);
+void nilfs_sysfs_exit(void);
+int nilfs_sysfs_create_device_group(struct super_block *);
+void nilfs_sysfs_delete_device_group(struct the_nilfs *);
+int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
+void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);
+
+/*
+ * Inodes and files operations
+ */
+extern const struct file_operations nilfs_dir_operations;
+extern const struct inode_operations nilfs_file_inode_operations;
+extern const struct file_operations nilfs_file_operations;
+extern const struct address_space_operations nilfs_aops;
+extern const struct inode_operations nilfs_dir_inode_operations;
+extern const struct inode_operations nilfs_special_inode_operations;
+extern const struct inode_operations nilfs_symlink_inode_operations;
+
+/*
+ * filesystem type
+ */
+extern struct file_system_type nilfs_fs_type;
+
+
+#endif /* _NILFS_H */