312 lines
10 KiB
C
312 lines
10 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 "sb.h"
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#include "bmap.h"
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#include "bmap_union.h"
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/*
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* nilfs inode data in memory
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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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union nilfs_bmap_union i_bmap_union;
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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 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((union nilfs_bmap_union *)bmap,
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struct nilfs_inode_info,
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i_bmap_union);
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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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static inline struct inode *NILFS_AS_I(struct address_space *mapping)
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{
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return (mapping->host) ? :
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container_of(mapping, struct inode, i_data);
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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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NILFS_I_GCDAT, /* shadow DAT, on memory only */
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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) (NILFS_SB(sb)->s_nilfs->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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static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
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{
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return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
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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_permission(struct inode *, int, struct nameidata *);
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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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#define nilfs_permission NULL
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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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/* 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 *, struct dentry *, int);
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/* ioctl.c */
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long nilfs_ioctl(struct file *, unsigned int, unsigned long);
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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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extern struct inode *nilfs_new_inode(struct inode *, int);
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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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extern struct inode *nilfs_iget(struct super_block *, unsigned long);
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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_delete_inode(struct inode *);
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extern int nilfs_setattr(struct dentry *, struct iattr *);
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extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
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struct buffer_head **);
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extern int nilfs_inode_dirty(struct inode *);
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extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
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unsigned);
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extern int nilfs_mark_inode_dirty(struct inode *);
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extern void nilfs_dirty_inode(struct inode *);
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/* namei.c */
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extern struct dentry *nilfs_get_parent(struct dentry *);
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/* super.c */
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extern struct inode *nilfs_alloc_inode_common(struct the_nilfs *);
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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 void nilfs_error(struct super_block *, const char *, const char *, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
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__attribute__ ((format (printf, 3, 4)));
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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_commit_super(struct nilfs_sb_info *, int);
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extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
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extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);
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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_gccache(struct the_nilfs *);
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void nilfs_destroy_gccache(struct the_nilfs *);
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void nilfs_clear_gcinode(struct inode *);
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struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64);
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void nilfs_remove_all_gcinode(struct the_nilfs *);
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/* gcdat.c */
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int nilfs_init_gcdat_inode(struct the_nilfs *);
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void nilfs_commit_gcdat_inode(struct the_nilfs *);
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void nilfs_clear_gcdat_inode(struct the_nilfs *);
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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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