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 "sb.h"
  34 #include "bmap.h"
  35
  36 /*
  37  * nilfs inode data in memory
  38  */
  39 struct nilfs_inode_info {
  40         __u32 i_flags;
  41         unsigned long  i_state;         /* Dynamic state flags */
  42         struct nilfs_bmap *i_bmap;
  43         struct nilfs_bmap i_bmap_data;
  44         __u64 i_xattr;  /* sector_t ??? */
  45         __u32 i_dir_start_lookup;
  46         __u64 i_cno;            /* check point number for GC inode */
  47         struct address_space i_btnode_cache;
  48         struct list_head i_dirty;       /* List for connecting dirty files */
  49
  50 #ifdef CONFIG_NILFS_XATTR
  51         /*
  52          * Extended attributes can be read independently of the main file
  53          * data. Taking i_sem even when reading would cause contention
  54          * between readers of EAs and writers of regular file data, so
  55          * instead we synchronize on xattr_sem when reading or changing
  56          * EAs.
  57          */
  58         struct rw_semaphore xattr_sem;
  59 #endif
  60         struct buffer_head *i_bh;       /* i_bh contains a new or dirty
  61                                            disk inode */
  62         struct nilfs_root *i_root;
  63         struct inode vfs_inode;
  64 };
  65
  66 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
  67 {
  68         return container_of(inode, struct nilfs_inode_info, vfs_inode);
  69 }
  70
  71 static inline struct nilfs_inode_info *
  72 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
  73 {
  74         return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
  75 }
  76
  77 static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
  78 {
  79         struct nilfs_inode_info *ii =
  80                 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
  81         return &ii->vfs_inode;
  82 }
  83
  84 static inline struct inode *NILFS_AS_I(struct address_space *mapping)
  85 {
  86         return (mapping->host) ? :
  87                 container_of(mapping, struct inode, i_data);
  88 }
  89
  90 /*
  91  * Dynamic state flags of NILFS on-memory inode (i_state)
  92  */
  93 enum {
  94         NILFS_I_NEW = 0,                /* Inode is newly created */
  95         NILFS_I_DIRTY,                  /* The file is dirty */
  96         NILFS_I_QUEUED,                 /* inode is in dirty_files list */
  97         NILFS_I_BUSY,                   /* inode is grabbed by a segment
  98                                            constructor */
  99         NILFS_I_COLLECTED,              /* All dirty blocks are collected */
 100         NILFS_I_UPDATED,                /* The file has been written back */
 101         NILFS_I_INODE_DIRTY,            /* write_inode is requested */
 102         NILFS_I_BMAP,                   /* has bmap and btnode_cache */
 103         NILFS_I_GCINODE,                /* inode for GC, on memory only */
 104 };
 105
 106 /*
 107  * commit flags for nilfs_commit_super and nilfs_sync_super
 108  */
 109 enum {
 110         NILFS_SB_COMMIT = 0,    /* Commit a super block alternately */
 111         NILFS_SB_COMMIT_ALL     /* Commit both super blocks */
 112 };
 113
 114 /*
 115  * Macros to check inode numbers
 116  */
 117 #define NILFS_MDT_INO_BITS   \
 118   ((unsigned int)(1 << NILFS_DAT_INO | 1 << NILFS_CPFILE_INO |          \
 119                   1 << NILFS_SUFILE_INO | 1 << NILFS_IFILE_INO |        \
 120                   1 << NILFS_ATIME_INO | 1 << NILFS_SKETCH_INO))
 121
 122 #define NILFS_SYS_INO_BITS   \
 123   ((unsigned int)(1 << NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
 124
 125 #define NILFS_FIRST_INO(sb)  (NILFS_SB(sb)->s_nilfs->ns_first_ino)
 126
 127 #define NILFS_MDT_INODE(sb, ino) \
 128   ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & (1 << (ino))))
 129 #define NILFS_VALID_INODE(sb, ino) \
 130   ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & (1 << (ino))))
 131
 132 /**
 133  * struct nilfs_transaction_info: context information for synchronization
 134  * @ti_magic: Magic number
 135  * @ti_save: Backup of journal_info field of task_struct
 136  * @ti_flags: Flags
 137  * @ti_count: Nest level
 138  * @ti_garbage: List of inode to be put when releasing semaphore
 139  */
 140 struct nilfs_transaction_info {
 141         u32                     ti_magic;
 142         void                   *ti_save;
 143                                 /* This should never used. If this happens,
 144                                    one of other filesystems has a bug. */
 145         unsigned short          ti_flags;
 146         unsigned short          ti_count;
 147         struct list_head        ti_garbage;
 148 };
 149
 150 /* ti_magic */
 151 #define NILFS_TI_MAGIC          0xd9e392fb
 152
 153 /* ti_flags */
 154 #define NILFS_TI_DYNAMIC_ALLOC  0x0001  /* Allocated from slab */
 155 #define NILFS_TI_SYNC           0x0002  /* Force to construct segment at the
 156                                            end of transaction. */
 157 #define NILFS_TI_GC             0x0004  /* GC context */
 158 #define NILFS_TI_COMMIT         0x0008  /* Change happened or not */
 159 #define NILFS_TI_WRITER         0x0010  /* Constructor context */
 160
 161
 162 int nilfs_transaction_begin(struct super_block *,
 163                             struct nilfs_transaction_info *, int);
 164 int nilfs_transaction_commit(struct super_block *);
 165 void nilfs_transaction_abort(struct super_block *);
 166
 167 static inline void nilfs_set_transaction_flag(unsigned int flag)
 168 {
 169         struct nilfs_transaction_info *ti = current->journal_info;
 170
 171         ti->ti_flags |= flag;
 172 }
 173
 174 static inline int nilfs_test_transaction_flag(unsigned int flag)
 175 {
 176         struct nilfs_transaction_info *ti = current->journal_info;
 177
 178         if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
 179                 return 0;
 180         return !!(ti->ti_flags & flag);
 181 }
 182
 183 static inline int nilfs_doing_gc(void)
 184 {
 185         return nilfs_test_transaction_flag(NILFS_TI_GC);
 186 }
 187
 188 static inline int nilfs_doing_construction(void)
 189 {
 190         return nilfs_test_transaction_flag(NILFS_TI_WRITER);
 191 }
 192
 193 /*
 194  * function prototype
 195  */
 196 #ifdef CONFIG_NILFS_POSIX_ACL
 197 #error "NILFS: not yet supported POSIX ACL"
 198 extern int nilfs_acl_chmod(struct inode *);
 199 extern int nilfs_init_acl(struct inode *, struct inode *);
 200 #else
 201 static inline int nilfs_acl_chmod(struct inode *inode)
 202 {
 203         return 0;
 204 }
 205
 206 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
 207 {
 208         inode->i_mode &= ~current_umask();
 209         return 0;
 210 }
 211 #endif
 212
 213 #define NILFS_ATIME_DISABLE
 214
 215 /* dir.c */
 216 extern int nilfs_add_link(struct dentry *, struct inode *);
 217 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
 218 extern int nilfs_make_empty(struct inode *, struct inode *);
 219 extern struct nilfs_dir_entry *
 220 nilfs_find_entry(struct inode *, const struct qstr *, struct page **);
 221 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
 222 extern int nilfs_empty_dir(struct inode *);
 223 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
 224 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
 225                            struct page *, struct inode *);
 226
 227 /* file.c */
 228 extern int nilfs_sync_file(struct file *, int);
 229
 230 /* ioctl.c */
 231 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
 232 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
 233                                        void **);
 234
 235 /* inode.c */
 236 extern struct inode *nilfs_new_inode(struct inode *, int);
 237 extern void nilfs_free_inode(struct inode *);
 238 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 239 extern void nilfs_set_inode_flags(struct inode *);
 240 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
 241 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
 242 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
 243                             unsigned long ino);
 244 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
 245                                 unsigned long ino);
 246 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
 247                          unsigned long ino);
 248 extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
 249                                        unsigned long ino, __u64 cno);
 250 extern void nilfs_update_inode(struct inode *, struct buffer_head *);
 251 extern void nilfs_truncate(struct inode *);
 252 extern void nilfs_evict_inode(struct inode *);
 253 extern int nilfs_setattr(struct dentry *, struct iattr *);
 254 int nilfs_permission(struct inode *inode, int mask, unsigned int flags);
 255 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
 256 extern int nilfs_inode_dirty(struct inode *);
 257 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty);
 258 extern int nilfs_mark_inode_dirty(struct inode *);
 259 extern void nilfs_dirty_inode(struct inode *);
 260 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 261                  __u64 start, __u64 len);
 262
 263 /* super.c */
 264 extern struct inode *nilfs_alloc_inode(struct super_block *);
 265 extern void nilfs_destroy_inode(struct inode *);
 266 extern void nilfs_error(struct super_block *, const char *, const char *, ...)
 267         __attribute__ ((format (printf, 3, 4)));
 268 extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
 269        __attribute__ ((format (printf, 3, 4)));
 270 extern struct nilfs_super_block *
 271 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
 272 extern int nilfs_store_magic_and_option(struct super_block *,
 273                                         struct nilfs_super_block *, char *);
 274 extern int nilfs_check_feature_compatibility(struct super_block *,
 275                                              struct nilfs_super_block *);
 276 extern void nilfs_set_log_cursor(struct nilfs_super_block *,
 277                                  struct the_nilfs *);
 278 extern struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *,
 279                                                       int flip);
 280 extern int nilfs_commit_super(struct nilfs_sb_info *, int);
 281 extern int nilfs_cleanup_super(struct nilfs_sb_info *);
 282 int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
 283                             struct nilfs_root **root);
 284 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
 285
 286 /* gcinode.c */
 287 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
 288                                    struct buffer_head **);
 289 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
 290                                    struct buffer_head **);
 291 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
 292 int nilfs_init_gcinode(struct inode *inode);
 293 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
 294
 295 /*
 296  * Inodes and files operations
 297  */
 298 extern const struct file_operations nilfs_dir_operations;
 299 extern const struct inode_operations nilfs_file_inode_operations;
 300 extern const struct file_operations nilfs_file_operations;
 301 extern const struct address_space_operations nilfs_aops;
 302 extern const struct inode_operations nilfs_dir_inode_operations;
 303 extern const struct inode_operations nilfs_special_inode_operations;
 304 extern const struct inode_operations nilfs_symlink_inode_operations;
 305
 306 /*
 307  * filesystem type
 308  */
 309 extern struct file_system_type nilfs_fs_type;
 310
 311
 312 #endif  /* _NILFS_H */