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