/* * nilfs.h - NILFS local header file. * * 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 General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Written by Koji Sato <koji@osrg.net> * Ryusuke Konishi <ryusuke@osrg.net> */ #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_fs.h> #include "the_nilfs.h" #include "sb.h" #include "bmap.h" #include "bmap_union.h" /* * nilfs inode data in memory */ struct nilfs_inode_info { __u32 i_flags; unsigned long i_state; /* Dynamic state flags */ struct nilfs_bmap *i_bmap; union nilfs_bmap_union i_bmap_union; __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 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((union nilfs_bmap_union *)bmap, struct nilfs_inode_info, i_bmap_union); } 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; } static inline struct inode *NILFS_AS_I(struct address_space *mapping) { return (mapping->host) ? : container_of(mapping, struct inode, i_data); } /* * 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_DIRTY, /* write_inode is requested */ NILFS_I_BMAP, /* has bmap and btnode_cache */ NILFS_I_GCINODE, /* inode for GC, on memory only */ NILFS_I_GCDAT, /* shadow DAT, on memory only */ }; /* * Macros to check inode numbers */ #define NILFS_MDT_INO_BITS \ ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO | \ 1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO | \ 1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO)) #define NILFS_SYS_INO_BITS \ ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS) #define NILFS_FIRST_INO(sb) (NILFS_SB(sb)->s_nilfs->ns_first_ino) #define NILFS_MDT_INODE(sb, ino) \ ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino)))) #define NILFS_VALID_INODE(sb, ino) \ ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (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 * @ti_garbage: List of inode to be put when releasing semaphore */ struct nilfs_transaction_info { u32 ti_magic; void *ti_save; /* This should never used. If this happens, one of other filesystems has a bug. */ unsigned short ti_flags; unsigned short ti_count; struct list_head ti_garbage; }; /* 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); } static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs) { return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat; } /* * function prototype */ #ifdef CONFIG_NILFS_POSIX_ACL #error "NILFS: not yet supported POSIX ACL" extern int nilfs_permission(struct inode *, int, struct nameidata *); extern int nilfs_acl_chmod(struct inode *); extern int nilfs_init_acl(struct inode *, struct inode *); #else #define nilfs_permission NULL 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 /* 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 *, int); /* ioctl.c */ long nilfs_ioctl(struct file *, unsigned int, unsigned long); int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *, void **); /* inode.c */ extern struct inode *nilfs_new_inode(struct inode *, int); 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); extern struct inode *nilfs_iget(struct super_block *, unsigned long); extern void nilfs_update_inode(struct inode *, struct buffer_head *); extern void nilfs_truncate(struct inode *); extern void nilfs_delete_inode(struct inode *); extern int nilfs_setattr(struct dentry *, struct iattr *); extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *, struct buffer_head **); extern int nilfs_inode_dirty(struct inode *); extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *, unsigned); extern int nilfs_mark_inode_dirty(struct inode *); extern void nilfs_dirty_inode(struct inode *); /* namei.c */ extern struct dentry *nilfs_get_parent(struct dentry *); /* super.c */ extern struct inode *nilfs_alloc_inode_common(struct the_nilfs *); extern struct inode *nilfs_alloc_inode(struct super_block *); extern void nilfs_destroy_inode(struct inode *); extern void nilfs_error(struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4))); extern void nilfs_warning(struct super_block *, const char *, const char *, ...) __attribute__ ((format (printf, 3, 4))); 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_commit_super(struct nilfs_sb_info *, int); extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64); extern void nilfs_detach_checkpoint(struct nilfs_sb_info *); /* 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_gccache(struct the_nilfs *); void nilfs_destroy_gccache(struct the_nilfs *); void nilfs_clear_gcinode(struct inode *); struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64); void nilfs_remove_all_gcinode(struct the_nilfs *); /* gcdat.c */ int nilfs_init_gcdat_inode(struct the_nilfs *); void nilfs_commit_gcdat_inode(struct the_nilfs *); void nilfs_clear_gcdat_inode(struct the_nilfs *); /* * 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 */