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 #include "bmap_union.h"
  36
  37 /*
  38  * nilfs inode data in memory
  39  */
  40 struct nilfs_inode_info {
  41         __u32 i_flags;
  42         unsigned long  i_state;         /* Dynamic state flags */
  43         struct nilfs_bmap *i_bmap;
  44         union nilfs_bmap_union i_bmap_union;
  45         __u64 i_xattr;  /* sector_t ??? */
  46         __u32 i_dir_start_lookup;
  47         __u64 i_cno;            /* check point number for GC inode */
  48         struct address_space i_btnode_cache;
  49         struct list_head i_dirty;       /* List for connecting dirty files */
  50
  51 #ifdef CONFIG_NILFS_XATTR
  52         /*
  53          * Extended attributes can be read independently of the main file
  54          * data. Taking i_sem even when reading would cause contention
  55          * between readers of EAs and writers of regular file data, so
  56          * instead we synchronize on xattr_sem when reading or changing
  57          * EAs.
  58          */
  59         struct rw_semaphore xattr_sem;
  60 #endif
  61 #ifdef CONFIG_NILFS_POSIX_ACL
  62         struct posix_acl *i_acl;
  63         struct posix_acl *i_default_acl;
  64 #endif
  65         struct buffer_head *i_bh;       /* i_bh contains a new or dirty
  66                                            disk inode */
  67         struct inode vfs_inode;
  68 };
  69
  70 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
  71 {
  72         return container_of(inode, struct nilfs_inode_info, vfs_inode);
  73 }
  74
  75 static inline struct nilfs_inode_info *
  76 NILFS_BMAP_I(const struct nilfs_bmap *bmap)
  77 {
  78         return container_of((union nilfs_bmap_union *)bmap,
  79                             struct nilfs_inode_info,
  80                             i_bmap_union);
  81 }
  82
  83 static inline struct inode *NILFS_BTNC_I(struct address_space *btnc)
  84 {
  85         struct nilfs_inode_info *ii =
  86                 container_of(btnc, struct nilfs_inode_info, i_btnode_cache);
  87         return &ii->vfs_inode;
  88 }
  89
  90 static inline struct inode *NILFS_AS_I(struct address_space *mapping)
  91 {
  92         return (mapping->host) ? :
  93                 container_of(mapping, struct inode, i_data);
  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_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         NILFS_I_GCDAT,                  /* shadow DAT, on memory only */
 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)  (NILFS_SB(sb)->s_nilfs->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 static inline struct inode *nilfs_dat_inode(const struct the_nilfs *nilfs)
 193 {
 194         return nilfs_doing_gc() ? nilfs->ns_gc_dat : nilfs->ns_dat;
 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_permission(struct inode *, int, struct nameidata *);
 203 extern int nilfs_acl_chmod(struct inode *);
 204 extern int nilfs_init_acl(struct inode *, struct inode *);
 205 #else
 206 #define nilfs_permission   NULL
 207
 208 static inline int nilfs_acl_chmod(struct inode *inode)
 209 {
 210         return 0;
 211 }
 212
 213 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
 214 {
 215         inode->i_mode &= ~current_umask();
 216         return 0;
 217 }
 218 #endif
 219
 220 #define NILFS_ATIME_DISABLE
 221
 222 /* dir.c */
 223 extern int nilfs_add_link(struct dentry *, struct inode *);
 224 extern ino_t nilfs_inode_by_name(struct inode *, struct dentry *);
 225 extern int nilfs_make_empty(struct inode *, struct inode *);
 226 extern struct nilfs_dir_entry *
 227 nilfs_find_entry(struct inode *, struct dentry *, struct page **);
 228 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *);
 229 extern int nilfs_empty_dir(struct inode *);
 230 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **);
 231 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
 232                            struct page *, struct inode *);
 233
 234 /* file.c */
 235 extern int nilfs_sync_file(struct file *, struct dentry *, int);
 236
 237 /* ioctl.c */
 238 long nilfs_ioctl(struct file *, unsigned int, unsigned long);
 239 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, void __user *);
 240
 241 /* inode.c */
 242 extern struct inode *nilfs_new_inode(struct inode *, int);
 243 extern void nilfs_free_inode(struct inode *);
 244 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
 245 extern void nilfs_set_inode_flags(struct inode *);
 246 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
 247 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int);
 248 extern struct inode *nilfs_iget(struct super_block *, unsigned long);
 249 extern void nilfs_update_inode(struct inode *, struct buffer_head *);
 250 extern void nilfs_truncate(struct inode *);
 251 extern void nilfs_delete_inode(struct inode *);
 252 extern int nilfs_setattr(struct dentry *, struct iattr *);
 253 extern int nilfs_load_inode_block(struct nilfs_sb_info *, struct inode *,
 254                                   struct buffer_head **);
 255 extern int nilfs_inode_dirty(struct inode *);
 256 extern int nilfs_set_file_dirty(struct nilfs_sb_info *, struct inode *,
 257                                 unsigned);
 258 extern int nilfs_mark_inode_dirty(struct inode *);
 259 extern void nilfs_dirty_inode(struct inode *);
 260
 261 /* namei.c */
 262 extern struct dentry *nilfs_get_parent(struct dentry *);
 263
 264 /* super.c */
 265 extern struct inode *nilfs_alloc_inode(struct super_block *);
 266 extern void nilfs_destroy_inode(struct inode *);
 267 extern void nilfs_error(struct super_block *, const char *, const char *, ...)
 268         __attribute__ ((format (printf, 3, 4)));
 269 extern void nilfs_warning(struct super_block *, const char *, const char *, ...)
 270        __attribute__ ((format (printf, 3, 4)));
 271 extern struct nilfs_super_block *
 272 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
 273 extern int nilfs_store_magic_and_option(struct super_block *,
 274                                         struct nilfs_super_block *, char *);
 275 extern int nilfs_commit_super(struct nilfs_sb_info *, int);
 276 extern int nilfs_attach_checkpoint(struct nilfs_sb_info *, __u64);
 277 extern void nilfs_detach_checkpoint(struct nilfs_sb_info *);
 278
 279 /* gcinode.c */
 280 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
 281                                    struct buffer_head **);
 282 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
 283                                    struct buffer_head **);
 284 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
 285 int nilfs_init_gccache(struct the_nilfs *);
 286 void nilfs_destroy_gccache(struct the_nilfs *);
 287 void nilfs_clear_gcinode(struct inode *);
 288 struct inode *nilfs_gc_iget(struct the_nilfs *, ino_t, __u64);
 289 void nilfs_remove_all_gcinode(struct the_nilfs *);
 290
 291 /* gcdat.c */
 292 int nilfs_init_gcdat_inode(struct the_nilfs *);
 293 void nilfs_commit_gcdat_inode(struct the_nilfs *);
 294 void nilfs_clear_gcdat_inode(struct the_nilfs *);
 295
 296 /*
 297  * Inodes and files operations
 298  */
 299 extern struct file_operations nilfs_dir_operations;
 300 extern struct inode_operations nilfs_file_inode_operations;
 301 extern struct file_operations nilfs_file_operations;
 302 extern struct address_space_operations nilfs_aops;
 303 extern struct inode_operations nilfs_dir_inode_operations;
 304 extern struct inode_operations nilfs_special_inode_operations;
 305 extern struct inode_operations nilfs_symlink_inode_operations;
 306
 307 /*
 308  * filesystem type
 309  */
 310 extern struct file_system_type nilfs_fs_type;
 311
 312
 313 #endif  /* _NILFS_H */