linux/fs/nilfs2/nilfs.h
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   1/*
   2 * nilfs.h - NILFS local header file.
   3 *
   4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with this program; if not, write to the Free Software
  18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 *
  20 * Written by Koji Sato <koji@osrg.net>
  21 *            Ryusuke Konishi <ryusuke@osrg.net>
  22 */
  23
  24#ifndef _NILFS_H
  25#define _NILFS_H
  26
  27#include <linux/kernel.h>
  28#include <linux/buffer_head.h>
  29#include <linux/spinlock.h>
  30#include <linux/blkdev.h>
  31#include <linux/nilfs2_fs.h>
  32#include "the_nilfs.h"
  33#include "bmap.h"
  34
  35/**
  36 * struct nilfs_inode_info - nilfs inode data in memory
  37 * @i_flags: inode flags
  38 * @i_state: dynamic state flags
  39 * @i_bmap: pointer on i_bmap_data
  40 * @i_bmap_data: raw block mapping
  41 * @i_xattr: <TODO>
  42 * @i_dir_start_lookup: page index of last successful search
  43 * @i_cno: checkpoint number for GC inode
  44 * @i_btnode_cache: cached pages of b-tree nodes
  45 * @i_dirty: list for connecting dirty files
  46 * @xattr_sem: semaphore for extended attributes processing
  47 * @i_bh: buffer contains disk inode
  48 * @i_root: root object of the current filesystem tree
  49 * @vfs_inode: VFS inode object
  50 */
  51struct nilfs_inode_info {
  52        __u32 i_flags;
  53        unsigned long  i_state;         /* Dynamic state flags */
  54        struct nilfs_bmap *i_bmap;
  55        struct nilfs_bmap i_bmap_data;
  56        __u64 i_xattr;  /* sector_t ??? */
  57        __u32 i_dir_start_lookup;
  58        __u64 i_cno;            /* check point number for GC inode */
  59        struct address_space i_btnode_cache;
  60        struct list_head i_dirty;       /* List for connecting dirty files */
  61
  62#ifdef CONFIG_NILFS_XATTR
  63        /*
  64         * Extended attributes can be read independently of the main file
  65         * data. Taking i_sem even when reading would cause contention
  66         * between readers of EAs and writers of regular file data, so
  67         * instead we synchronize on xattr_sem when reading or changing
  68         * EAs.
  69         */
  70        struct rw_semaphore xattr_sem;
  71#endif
  72        struct buffer_head *i_bh;       /* i_bh contains a new or dirty
  73                                           disk inode */
  74        struct nilfs_root *i_root;
  75        struct inode vfs_inode;
  76};
  77
  78static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
  79{
  80        return container_of(inode, struct nilfs_inode_info, vfs_inode);
  81}
  82
  83static inline struct nilfs_inode_info *
  84NILFS_BMAP_I(const struct nilfs_bmap *bmap)
  85{
  86        return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
  87}
  88
  89static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
  90{
  91        struct nilfs_inode_info *ii =
  92                container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
  93        return &ii->vfs_inode;
  94}
  95
  96/*
  97 * Dynamic state flags of NILFS on-memory inode (i_state)
  98 */
  99enum {
 100        NILFS_I_NEW = 0,                /* Inode is newly created */
 101        NILFS_I_DIRTY,                  /* The file is dirty */
 102        NILFS_I_QUEUED,                 /* inode is in dirty_files list */
 103        NILFS_I_BUSY,                   /* inode is grabbed by a segment
 104                                           constructor */
 105        NILFS_I_COLLECTED,              /* All dirty blocks are collected */
 106        NILFS_I_UPDATED,                /* The file has been written back */
 107        NILFS_I_INODE_DIRTY,            /* write_inode is requested */
 108        NILFS_I_BMAP,                   /* has bmap and btnode_cache */
 109        NILFS_I_GCINODE,                /* inode for GC, on memory only */
 110};
 111
 112/*
 113 * commit flags for nilfs_commit_super and nilfs_sync_super
 114 */
 115enum {
 116        NILFS_SB_COMMIT = 0,    /* Commit a super block alternately */
 117        NILFS_SB_COMMIT_ALL     /* Commit both super blocks */
 118};
 119
 120/*
 121 * Macros to check inode numbers
 122 */
 123#define NILFS_MDT_INO_BITS   \
 124        ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO |    \
 125                        1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO |  \
 126                        1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
 127
 128#define NILFS_SYS_INO_BITS   \
 129        ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
 130
 131#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
 132
 133#define NILFS_MDT_INODE(sb, ino) \
 134        ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
 135#define NILFS_VALID_INODE(sb, ino) \
 136        ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
 137
 138/**
 139 * struct nilfs_transaction_info: context information for synchronization
 140 * @ti_magic: Magic number
 141 * @ti_save: Backup of journal_info field of task_struct
 142 * @ti_flags: Flags
 143 * @ti_count: Nest level
 144 * @ti_garbage: List of inode to be put when releasing semaphore
 145 */
 146struct nilfs_transaction_info {
 147        u32                     ti_magic;
 148        void                   *ti_save;
 149                                /* This should never used. If this happens,
 150                                   one of other filesystems has a bug. */
 151        unsigned short          ti_flags;
 152        unsigned short          ti_count;
 153        struct list_head        ti_garbage;
 154};
 155
 156/* ti_magic */
 157#define NILFS_TI_MAGIC          0xd9e392fb
 158
 159/* ti_flags */
 160#define NILFS_TI_DYNAMIC_ALLOC  0x0001  /* Allocated from slab */
 161#define NILFS_TI_SYNC           0x0002  /* Force to construct segment at the
 162                                           end of transaction. */
 163#define NILFS_TI_GC             0x0004  /* GC context */
 164#define NILFS_TI_COMMIT         0x0008  /* Change happened or not */
 165#define NILFS_TI_WRITER         0x0010  /* Constructor context */
 166
 167
 168int nilfs_transaction_begin(struct super_block *,
 169                            struct nilfs_transaction_info *, int);
 170int nilfs_transaction_commit(struct super_block *);
 171void nilfs_transaction_abort(struct super_block *);
 172
 173static inline void nilfs_set_transaction_flag(unsigned int flag)
 174{
 175        struct nilfs_transaction_info *ti = current->journal_info;
 176
 177        ti->ti_flags |= flag;
 178}
 179
 180static inline int nilfs_test_transaction_flag(unsigned int flag)
 181{
 182        struct nilfs_transaction_info *ti = current->journal_info;
 183
 184        if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
 185                return 0;
 186        return !!(ti->ti_flags & flag);
 187}
 188
 189static inline int nilfs_doing_gc(void)
 190{
 191        return nilfs_test_transaction_flag(NILFS_TI_GC);
 192}
 193
 194static inline int nilfs_doing_construction(void)
 195{
 196        return nilfs_test_transaction_flag(NILFS_TI_WRITER);
 197}
 198
 199/*
 200 * function prototype
 201 */
 202#ifdef CONFIG_NILFS_POSIX_ACL
 203#error "NILFS: not yet supported POSIX ACL"
 204extern int nilfs_acl_chmod(struct inode *);
 205extern int nilfs_init_acl(struct inode *, struct inode *);
 206#else
 207static inline int nilfs_acl_chmod(struct inode *inode)
 208{
 209        return 0;
 210}
 211
 212static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
 213{
 214        inode->i_mode &= ~current_umask();
 215        return 0;
 216}
 217#endif
 218
 219#define NILFS_ATIME_DISABLE
 220
 221/* Flags that should be inherited by new inodes from their parent. */
 222#define NILFS_FL_INHERITED                                              \
 223        (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL |          \
 224         FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
 225         FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
 226
 227/* Mask out flags that are inappropriate for the given type of inode. */
 228static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
 229{
 230        if (S_ISDIR(mode))
 231                return flags;
 232        else if (S_ISREG(mode))
 233                return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
 234        else
 235                return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
 236}
 237
 238/* dir.c */
 239extern int nilfs_add_link(struct dentry *, struct inode *);
 240extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
 241extern int nilfs_make_empty(struct inode *, struct inode *);
 242extern struct nilfs_dir_entry *
 243nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
 244extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
 245extern int nilfs_empty_dir(struct inode *);
 246extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
 247extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
 248                           struct page *, struct inode *);
 249
 250/* file.c */
 251extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
 252
 253/* ioctl.c */
 254long nilfs_ioctl(struct file *, unsigned int, unsigned long);
 255long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 256int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
 257                                       void **);
 258
 259/* inode.c */
 260void nilfs_inode_add_blocks(struct inode *inode, int n);
 261void nilfs_inode_sub_blocks(struct inode *inode, int n);
 262extern struct inode *nilfs_new_inode(struct inode *, umode_t);
 263extern void nilfs_free_inode(struct inode *);
 264extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 265extern void nilfs_set_inode_flags(struct inode *);
 266extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
 267extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
 268struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
 269                            unsigned long ino);
 270struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
 271                                unsigned long ino);
 272struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
 273                         unsigned long ino);
 274extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
 275                                       unsigned long ino, __u64 cno);
 276extern void nilfs_update_inode(struct inode *, struct buffer_head *);
 277extern void nilfs_truncate(struct inode *);
 278extern void nilfs_evict_inode(struct inode *);
 279extern int nilfs_setattr(struct dentry *, struct iattr *);
 280int nilfs_permission(struct inode *inode, int mask);
 281int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
 282extern int nilfs_inode_dirty(struct inode *);
 283int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty);
 284extern int nilfs_mark_inode_dirty(struct inode *);
 285extern void nilfs_dirty_inode(struct inode *, int flags);
 286int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 287                 __u64 start, __u64 len);
 288
 289/* super.c */
 290extern struct inode *nilfs_alloc_inode(struct super_block *);
 291extern void nilfs_destroy_inode(struct inode *);
 292extern __printf(3, 4)
 293void nilfs_error(struct super_block *, const char *, const char *, ...);
 294extern __printf(3, 4)
 295void nilfs_warning(struct super_block *, const char *, const char *, ...);
 296extern struct nilfs_super_block *
 297nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
 298extern int nilfs_store_magic_and_option(struct super_block *,
 299                                        struct nilfs_super_block *, char *);
 300extern int nilfs_check_feature_compatibility(struct super_block *,
 301                                             struct nilfs_super_block *);
 302extern void nilfs_set_log_cursor(struct nilfs_super_block *,
 303                                 struct the_nilfs *);
 304struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
 305                                               int flip);
 306int nilfs_commit_super(struct super_block *sb, int flag);
 307int nilfs_cleanup_super(struct super_block *sb);
 308int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
 309int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
 310                            struct nilfs_root **root);
 311int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
 312
 313/* gcinode.c */
 314int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
 315                                   struct buffer_head **);
 316int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
 317                                   struct buffer_head **);
 318int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
 319int nilfs_init_gcinode(struct inode *inode);
 320void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
 321
 322/*
 323 * Inodes and files operations
 324 */
 325extern const struct file_operations nilfs_dir_operations;
 326extern const struct inode_operations nilfs_file_inode_operations;
 327extern const struct file_operations nilfs_file_operations;
 328extern const struct address_space_operations nilfs_aops;
 329extern const struct inode_operations nilfs_dir_inode_operations;
 330extern const struct inode_operations nilfs_special_inode_operations;
 331extern const struct inode_operations nilfs_symlink_inode_operations;
 332
 333/*
 334 * filesystem type
 335 */
 336extern struct file_system_type nilfs_fs_type;
 337
 338
 339#endif  /* _NILFS_H */
 340
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