fs/nilfs2/nilfs.h

   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  */
  51 struct 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
  78 static 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
  83 static inline struct nilfs_inode_info *
  84 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
  85 {
  86         return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
  87 }
  88
  89 static 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  */
  99 enum {
 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_SYNC,             /* dsync is not allowed for inode */
 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  */
 115 enum {
 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  */
 145 struct nilfs_transaction_info {
 146         u32                     ti_magic;
 147         void                   *ti_save;
 148                                 /* This should never used. If this happens,
 149                                    one of other filesystems has a bug. */
 150         unsigned short          ti_flags;
 151         unsigned short          ti_count;
 152 };
 153
 154 /* ti_magic */
 155 #define NILFS_TI_MAGIC          0xd9e392fb
 156
 157 /* ti_flags */
 158 #define NILFS_TI_DYNAMIC_ALLOC  0x0001  /* Allocated from slab */
 159 #define NILFS_TI_SYNC           0x0002  /* Force to construct segment at the
 160                                            end of transaction. */
 161 #define NILFS_TI_GC             0x0004  /* GC context */
 162 #define NILFS_TI_COMMIT         0x0008  /* Change happened or not */
 163 #define NILFS_TI_WRITER         0x0010  /* Constructor context */
 164
 165
 166 int nilfs_transaction_begin(struct super_block *,
 167                             struct nilfs_transaction_info *, int);
 168 int nilfs_transaction_commit(struct super_block *);
 169 void nilfs_transaction_abort(struct super_block *);
 170
 171 static inline void nilfs_set_transaction_flag(unsigned int flag)
 172 {
 173         struct nilfs_transaction_info *ti = current->journal_info;
 174
 175         ti->ti_flags |= flag;
 176 }
 177
 178 static inline int nilfs_test_transaction_flag(unsigned int flag)
 179 {
 180         struct nilfs_transaction_info *ti = current->journal_info;
 181
 182         if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
 183                 return 0;
 184         return !!(ti->ti_flags & flag);
 185 }
 186
 187 static inline int nilfs_doing_gc(void)
 188 {
 189         return nilfs_test_transaction_flag(NILFS_TI_GC);
 190 }
 191
 192 static inline int nilfs_doing_construction(void)
 193 {
 194         return nilfs_test_transaction_flag(NILFS_TI_WRITER);
 195 }
 196
 197 /*
 198  * function prototype
 199  */
 200 #ifdef CONFIG_NILFS_POSIX_ACL
 201 #error "NILFS: not yet supported POSIX ACL"
 202 extern int nilfs_acl_chmod(struct inode *);
 203 extern int nilfs_init_acl(struct inode *, struct inode *);
 204 #else
 205 static inline int nilfs_acl_chmod(struct inode *inode)
 206 {
 207         return 0;
 208 }
 209
 210 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
 211 {
 212         inode->i_mode &= ~current_umask();
 213         return 0;
 214 }
 215 #endif
 216
 217 #define NILFS_ATIME_DISABLE
 218
 219 /* Flags that should be inherited by new inodes from their parent. */
 220 #define NILFS_FL_INHERITED                                              \
 221         (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL |          \
 222          FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
 223          FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
 224
 225 /* Mask out flags that are inappropriate for the given type of inode. */
 226 static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
 227 {
 228         if (S_ISDIR(mode))
 229                 return flags;
 230         else if (S_ISREG(mode))
 231                 return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
 232         else
 233                 return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
 234 }
 235
 236 /* dir.c */
 237 extern int nilfs_add_link(struct dentry *, struct inode *);
 238 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
 239 extern int nilfs_make_empty(struct inode *, struct inode *);
 240 extern struct nilfs_dir_entry *
 241 nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
 242 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
 243 extern int nilfs_empty_dir(struct inode *);
 244 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
 245 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
 246                            struct page *, struct inode *);
 247
 248 /* file.c */
 249 extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
 250
 251 /* ioctl.c */
 252 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
 253 long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 254 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
 255                                        void **);
 256
 257 /* inode.c */
 258 void nilfs_inode_add_blocks(struct inode *inode, int n);
 259 void nilfs_inode_sub_blocks(struct inode *inode, int n);
 260 extern struct inode *nilfs_new_inode(struct inode *, umode_t);
 261 extern void nilfs_free_inode(struct inode *);
 262 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 263 extern void nilfs_set_inode_flags(struct inode *);
 264 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
 265 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
 266 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
 267                             unsigned long ino);
 268 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
 269                                 unsigned long ino);
 270 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
 271                          unsigned long ino);
 272 extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
 273                                        unsigned long ino, __u64 cno);
 274 extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
 275 extern void nilfs_truncate(struct inode *);
 276 extern void nilfs_evict_inode(struct inode *);
 277 extern int nilfs_setattr(struct dentry *, struct iattr *);
 278 extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
 279 int nilfs_permission(struct inode *inode, int mask);
 280 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
 281 extern int nilfs_inode_dirty(struct inode *);
 282 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty);
 283 extern int __nilfs_mark_inode_dirty(struct inode *, int);
 284 extern void nilfs_dirty_inode(struct inode *, int flags);
 285 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 286                  __u64 start, __u64 len);
 287 static inline int nilfs_mark_inode_dirty(struct inode *inode)
 288 {
 289         return __nilfs_mark_inode_dirty(inode, I_DIRTY);
 290 }
 291 static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
 292 {
 293         return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
 294 }
 295
 296 /* super.c */
 297 extern struct inode *nilfs_alloc_inode(struct super_block *);
 298 extern void nilfs_destroy_inode(struct inode *);
 299 extern __printf(3, 4)
 300 void nilfs_error(struct super_block *, const char *, const char *, ...);
 301 extern __printf(3, 4)
 302 void nilfs_warning(struct super_block *, const char *, const char *, ...);
 303 extern struct nilfs_super_block *
 304 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
 305 extern int nilfs_store_magic_and_option(struct super_block *,
 306                                         struct nilfs_super_block *, char *);
 307 extern int nilfs_check_feature_compatibility(struct super_block *,
 308                                              struct nilfs_super_block *);
 309 extern void nilfs_set_log_cursor(struct nilfs_super_block *,
 310                                  struct the_nilfs *);
 311 struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
 312                                                int flip);
 313 int nilfs_commit_super(struct super_block *sb, int flag);
 314 int nilfs_cleanup_super(struct super_block *sb);
 315 int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
 316 int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
 317                             struct nilfs_root **root);
 318 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
 319
 320 /* gcinode.c */
 321 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
 322                                    struct buffer_head **);
 323 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
 324                                    struct buffer_head **);
 325 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
 326 int nilfs_init_gcinode(struct inode *inode);
 327 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
 328
 329 /* sysfs.c */
 330 int __init nilfs_sysfs_init(void);
 331 void nilfs_sysfs_exit(void);
 332 int nilfs_sysfs_create_device_group(struct super_block *);
 333 void nilfs_sysfs_delete_device_group(struct the_nilfs *);
 334 int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
 335 void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);
 336
 337 /*
 338  * Inodes and files operations
 339  */
 340 extern const struct file_operations nilfs_dir_operations;
 341 extern const struct inode_operations nilfs_file_inode_operations;
 342 extern const struct file_operations nilfs_file_operations;
 343 extern const struct address_space_operations nilfs_aops;
 344 extern const struct inode_operations nilfs_dir_inode_operations;
 345 extern const struct inode_operations nilfs_special_inode_operations;
 346 extern const struct inode_operations nilfs_symlink_inode_operations;
 347
 348 /*
 349  * filesystem type
 350  */
 351 extern struct file_system_type nilfs_fs_type;
 352
 353
 354 #endif  /* _NILFS_H */