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Diffstat (limited to 'fs/nilfs2/nilfs.h')
| -rw-r--r-- | fs/nilfs2/nilfs.h | 323 |
1 files changed, 323 insertions, 0 deletions
diff --git a/fs/nilfs2/nilfs.h b/fs/nilfs2/nilfs.h new file mode 100644 index 00000000000..17458ad4a80 --- /dev/null +++ b/fs/nilfs2/nilfs.h @@ -0,0 +1,323 @@ +/* + * 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 filesystem version + */ +#define NILFS_VERSION "2.0.5" + +/* + * 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_dtime; + __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 +#ifdef CONFIG_NILFS_POSIX_ACL + struct posix_acl *i_acl; + struct posix_acl *i_default_acl; +#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_end(struct super_block *, int); + +static inline void nilfs_set_transaction_flag(unsigned int flag) +{ + struct nilfs_transaction_info *ti = current->journal_info; + + BUG_ON(!ti); + 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 *, struct dentry *); +extern int nilfs_make_empty(struct inode *, struct inode *); +extern struct nilfs_dir_entry * +nilfs_find_entry(struct inode *, struct dentry *, 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 *, struct dentry *, int); + +/* ioctl.c */ +int nilfs_ioctl(struct inode *, struct file *, unsigned int, unsigned long); +long nilfs_compat_ioctl(struct file *, unsigned int, unsigned long); +int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, void __user *); + +/* 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(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_load_super_block(struct super_block *, struct buffer_head **); +extern struct nilfs_super_block * +nilfs_reload_super_block(struct super_block *, struct buffer_head **, int); +extern int nilfs_store_magic_and_option(struct super_block *, + struct nilfs_super_block *, char *); +extern void nilfs_update_last_segment(struct nilfs_sb_info *, int); +extern int nilfs_commit_super(struct nilfs_sb_info *); +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 struct file_operations nilfs_dir_operations; +extern struct inode_operations nilfs_file_inode_operations; +extern struct file_operations nilfs_file_operations; +extern struct address_space_operations nilfs_aops; +extern struct inode_operations nilfs_dir_inode_operations; +extern struct inode_operations nilfs_special_inode_operations; +extern struct inode_operations nilfs_symlink_inode_operations; + +/* + * filesystem type + */ +extern struct file_system_type nilfs_fs_type; + + +#endif /* _NILFS_H */ |