mirror of https://gitee.com/openkylin/linux.git
349 lines
12 KiB
C
349 lines
12 KiB
C
/*
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* nilfs.h - NILFS local header file.
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*
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* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Written by Koji Sato <koji@osrg.net>
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* Ryusuke Konishi <ryusuke@osrg.net>
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*/
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#ifndef _NILFS_H
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#define _NILFS_H
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#include <linux/kernel.h>
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#include <linux/buffer_head.h>
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#include <linux/spinlock.h>
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#include <linux/blkdev.h>
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#include <linux/nilfs2_fs.h>
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#include "the_nilfs.h"
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#include "bmap.h"
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/**
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* struct nilfs_inode_info - nilfs inode data in memory
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* @i_flags: inode flags
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* @i_state: dynamic state flags
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* @i_bmap: pointer on i_bmap_data
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* @i_bmap_data: raw block mapping
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* @i_xattr: <TODO>
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* @i_dir_start_lookup: page index of last successful search
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* @i_cno: checkpoint number for GC inode
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* @i_btnode_cache: cached pages of b-tree nodes
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* @i_dirty: list for connecting dirty files
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* @xattr_sem: semaphore for extended attributes processing
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* @i_bh: buffer contains disk inode
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* @i_root: root object of the current filesystem tree
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* @vfs_inode: VFS inode object
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*/
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struct nilfs_inode_info {
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__u32 i_flags;
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unsigned long i_state; /* Dynamic state flags */
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struct nilfs_bmap *i_bmap;
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struct nilfs_bmap i_bmap_data;
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__u64 i_xattr; /* sector_t ??? */
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__u32 i_dir_start_lookup;
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__u64 i_cno; /* check point number for GC inode */
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struct address_space i_btnode_cache;
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struct list_head i_dirty; /* List for connecting dirty files */
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#ifdef CONFIG_NILFS_XATTR
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/*
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* Extended attributes can be read independently of the main file
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* data. Taking i_sem even when reading would cause contention
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* between readers of EAs and writers of regular file data, so
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* instead we synchronize on xattr_sem when reading or changing
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* EAs.
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*/
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struct rw_semaphore xattr_sem;
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#endif
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struct buffer_head *i_bh; /* i_bh contains a new or dirty
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disk inode */
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struct nilfs_root *i_root;
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struct inode vfs_inode;
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};
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static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
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{
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return container_of(inode, struct nilfs_inode_info, vfs_inode);
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}
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static inline struct nilfs_inode_info *
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NILFS_BMAP_I(const struct nilfs_bmap *bmap)
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{
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return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
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}
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static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
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{
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struct nilfs_inode_info *ii =
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container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
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return &ii->vfs_inode;
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}
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/*
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* Dynamic state flags of NILFS on-memory inode (i_state)
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*/
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enum {
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NILFS_I_NEW = 0, /* Inode is newly created */
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NILFS_I_DIRTY, /* The file is dirty */
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NILFS_I_QUEUED, /* inode is in dirty_files list */
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NILFS_I_BUSY, /* inode is grabbed by a segment
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constructor */
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NILFS_I_COLLECTED, /* All dirty blocks are collected */
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NILFS_I_UPDATED, /* The file has been written back */
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NILFS_I_INODE_DIRTY, /* write_inode is requested */
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NILFS_I_BMAP, /* has bmap and btnode_cache */
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NILFS_I_GCINODE, /* inode for GC, on memory only */
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};
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/*
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* commit flags for nilfs_commit_super and nilfs_sync_super
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*/
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enum {
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NILFS_SB_COMMIT = 0, /* Commit a super block alternately */
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NILFS_SB_COMMIT_ALL /* Commit both super blocks */
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};
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/*
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* Macros to check inode numbers
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*/
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#define NILFS_MDT_INO_BITS \
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((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \
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1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \
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1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
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#define NILFS_SYS_INO_BITS \
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((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
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#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
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#define NILFS_MDT_INODE(sb, ino) \
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((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
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#define NILFS_VALID_INODE(sb, ino) \
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((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
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/**
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* struct nilfs_transaction_info: context information for synchronization
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* @ti_magic: Magic number
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* @ti_save: Backup of journal_info field of task_struct
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* @ti_flags: Flags
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* @ti_count: Nest level
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* @ti_garbage: List of inode to be put when releasing semaphore
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*/
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struct nilfs_transaction_info {
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u32 ti_magic;
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void *ti_save;
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/* This should never used. If this happens,
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one of other filesystems has a bug. */
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unsigned short ti_flags;
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unsigned short ti_count;
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struct list_head ti_garbage;
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};
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/* ti_magic */
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#define NILFS_TI_MAGIC 0xd9e392fb
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/* ti_flags */
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#define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
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#define NILFS_TI_SYNC 0x0002 /* Force to construct segment at the
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end of transaction. */
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#define NILFS_TI_GC 0x0004 /* GC context */
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#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
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#define NILFS_TI_WRITER 0x0010 /* Constructor context */
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int nilfs_transaction_begin(struct super_block *,
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struct nilfs_transaction_info *, int);
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int nilfs_transaction_commit(struct super_block *);
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void nilfs_transaction_abort(struct super_block *);
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static inline void nilfs_set_transaction_flag(unsigned int flag)
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{
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struct nilfs_transaction_info *ti = current->journal_info;
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ti->ti_flags |= flag;
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}
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static inline int nilfs_test_transaction_flag(unsigned int flag)
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{
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struct nilfs_transaction_info *ti = current->journal_info;
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if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
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return 0;
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return !!(ti->ti_flags & flag);
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}
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static inline int nilfs_doing_gc(void)
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{
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return nilfs_test_transaction_flag(NILFS_TI_GC);
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}
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static inline int nilfs_doing_construction(void)
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{
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return nilfs_test_transaction_flag(NILFS_TI_WRITER);
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}
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/*
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* function prototype
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*/
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#ifdef CONFIG_NILFS_POSIX_ACL
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#error "NILFS: not yet supported POSIX ACL"
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extern int nilfs_acl_chmod(struct inode *);
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extern int nilfs_init_acl(struct inode *, struct inode *);
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#else
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static inline int nilfs_acl_chmod(struct inode *inode)
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{
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return 0;
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}
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static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
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{
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inode->i_mode &= ~current_umask();
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return 0;
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}
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#endif
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#define NILFS_ATIME_DISABLE
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/* Flags that should be inherited by new inodes from their parent. */
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#define NILFS_FL_INHERITED \
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(FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \
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FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
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FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
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/* Mask out flags that are inappropriate for the given type of inode. */
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static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
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{
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if (S_ISDIR(mode))
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return flags;
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else if (S_ISREG(mode))
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return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
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else
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return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
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}
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/* dir.c */
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extern int nilfs_add_link(struct dentry *, struct inode *);
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extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
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extern int nilfs_make_empty(struct inode *, struct inode *);
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extern struct nilfs_dir_entry *
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nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
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extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
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extern int nilfs_empty_dir(struct inode *);
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extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
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extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
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struct page *, struct inode *);
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/* file.c */
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extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
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/* ioctl.c */
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long nilfs_ioctl(struct file *, unsigned int, unsigned long);
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long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
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void **);
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/* inode.c */
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void nilfs_inode_add_blocks(struct inode *inode, int n);
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void nilfs_inode_sub_blocks(struct inode *inode, int n);
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extern struct inode *nilfs_new_inode(struct inode *, umode_t);
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extern void nilfs_free_inode(struct inode *);
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extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
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extern void nilfs_set_inode_flags(struct inode *);
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extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
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extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
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struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
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unsigned long ino);
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struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
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unsigned long ino);
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struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
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unsigned long ino);
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extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
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unsigned long ino, __u64 cno);
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extern void nilfs_update_inode(struct inode *, struct buffer_head *);
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extern void nilfs_truncate(struct inode *);
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extern void nilfs_evict_inode(struct inode *);
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extern int nilfs_setattr(struct dentry *, struct iattr *);
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extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
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int nilfs_permission(struct inode *inode, int mask);
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int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
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extern int nilfs_inode_dirty(struct inode *);
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int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty);
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extern int nilfs_mark_inode_dirty(struct inode *);
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extern void nilfs_dirty_inode(struct inode *, int flags);
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int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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__u64 start, __u64 len);
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/* super.c */
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extern struct inode *nilfs_alloc_inode(struct super_block *);
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extern void nilfs_destroy_inode(struct inode *);
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extern __printf(3, 4)
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void nilfs_error(struct super_block *, const char *, const char *, ...);
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extern __printf(3, 4)
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void nilfs_warning(struct super_block *, const char *, const char *, ...);
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extern struct nilfs_super_block *
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nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
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extern int nilfs_store_magic_and_option(struct super_block *,
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struct nilfs_super_block *, char *);
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extern int nilfs_check_feature_compatibility(struct super_block *,
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struct nilfs_super_block *);
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extern void nilfs_set_log_cursor(struct nilfs_super_block *,
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struct the_nilfs *);
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struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
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int flip);
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int nilfs_commit_super(struct super_block *sb, int flag);
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int nilfs_cleanup_super(struct super_block *sb);
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int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
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int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
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struct nilfs_root **root);
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int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
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/* gcinode.c */
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int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
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struct buffer_head **);
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int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
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struct buffer_head **);
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int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
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int nilfs_init_gcinode(struct inode *inode);
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void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
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/* sysfs.c */
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int __init nilfs_sysfs_init(void);
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void nilfs_sysfs_exit(void);
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int nilfs_sysfs_create_device_group(struct super_block *);
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void nilfs_sysfs_delete_device_group(struct the_nilfs *);
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int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
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void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);
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/*
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* Inodes and files operations
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*/
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extern const struct file_operations nilfs_dir_operations;
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extern const struct inode_operations nilfs_file_inode_operations;
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extern const struct file_operations nilfs_file_operations;
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extern const struct address_space_operations nilfs_aops;
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extern const struct inode_operations nilfs_dir_inode_operations;
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extern const struct inode_operations nilfs_special_inode_operations;
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extern const struct inode_operations nilfs_symlink_inode_operations;
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/*
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* filesystem type
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*/
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extern struct file_system_type nilfs_fs_type;
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#endif /* _NILFS_H */
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