| /* |
| * 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_evict_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 */ |