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 * @ti_garbage: List of inode to be put when releasing semaphore 145 */ 146 struct 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 */ 166 167 168 int nilfs_transaction_begin(struct super_block *, 169 struct nilfs_transaction_info *, int); 170 int nilfs_transaction_commit(struct super_block *); 171 void nilfs_transaction_abort(struct super_block *); 172 173 static 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 } 179 180 static 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 } 188 189 static inline int nilfs_doing_gc(void) 190 { 191 return nilfs_test_transaction_flag(NILFS_TI_GC); 192 } 193 194 static 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" 204 extern int nilfs_acl_chmod(struct inode *); 205 extern int nilfs_init_acl(struct inode *, struct inode *); 206 #else 207 static inline int nilfs_acl_chmod(struct inode *inode) 208 { 209 return 0; 210 } 211 212 static 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. */ 228 static 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 */ 239 extern int nilfs_add_link(struct dentry *, struct inode *); 240 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *); 241 extern int nilfs_make_empty(struct inode *, struct inode *); 242 extern struct nilfs_dir_entry * 243 nilfs_find_entry(struct inode *, const struct qstr *, struct page **); 244 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *); 245 extern int nilfs_empty_dir(struct inode *); 246 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **); 247 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *, 248 struct page *, struct inode *); 249 250 /* file.c */ 251 extern int nilfs_sync_file(struct file *, loff_t, loff_t, int); 252 253 /* ioctl.c */ 254 long nilfs_ioctl(struct file *, unsigned int, unsigned long); 255 long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 256 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *, 257 void **); 258 259 /* inode.c */ 260 void nilfs_inode_add_blocks(struct inode *inode, int n); 261 void nilfs_inode_sub_blocks(struct inode *inode, int n); 262 extern struct inode *nilfs_new_inode(struct inode *, umode_t); 263 extern void nilfs_free_inode(struct inode *); 264 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int); 265 extern void nilfs_set_inode_flags(struct inode *); 266 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *); 267 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int); 268 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, 269 unsigned long ino); 270 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, 271 unsigned long ino); 272 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, 273 unsigned long ino); 274 extern struct inode *nilfs_iget_for_gc(struct super_block *sb, 275 unsigned long ino, __u64 cno); 276 extern void nilfs_update_inode(struct inode *, struct buffer_head *, int); 277 extern void nilfs_truncate(struct inode *); 278 extern void nilfs_evict_inode(struct inode *); 279 extern int nilfs_setattr(struct dentry *, struct iattr *); 280 extern void nilfs_write_failed(struct address_space *mapping, loff_t to); 281 int nilfs_permission(struct inode *inode, int mask); 282 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh); 283 extern int nilfs_inode_dirty(struct inode *); 284 int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty); 285 extern int __nilfs_mark_inode_dirty(struct inode *, int); 286 extern void nilfs_dirty_inode(struct inode *, int flags); 287 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 288 __u64 start, __u64 len); 289 static inline int nilfs_mark_inode_dirty(struct inode *inode) 290 { 291 return __nilfs_mark_inode_dirty(inode, I_DIRTY); 292 } 293 static inline int nilfs_mark_inode_dirty_sync(struct inode *inode) 294 { 295 return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC); 296 } 297 298 /* super.c */ 299 extern struct inode *nilfs_alloc_inode(struct super_block *); 300 extern void nilfs_destroy_inode(struct inode *); 301 extern __printf(3, 4) 302 void nilfs_error(struct super_block *, const char *, const char *, ...); 303 extern __printf(3, 4) 304 void nilfs_warning(struct super_block *, const char *, const char *, ...); 305 extern struct nilfs_super_block * 306 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **); 307 extern int nilfs_store_magic_and_option(struct super_block *, 308 struct nilfs_super_block *, char *); 309 extern int nilfs_check_feature_compatibility(struct super_block *, 310 struct nilfs_super_block *); 311 extern void nilfs_set_log_cursor(struct nilfs_super_block *, 312 struct the_nilfs *); 313 struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, 314 int flip); 315 int nilfs_commit_super(struct super_block *sb, int flag); 316 int nilfs_cleanup_super(struct super_block *sb); 317 int nilfs_resize_fs(struct super_block *sb, __u64 newsize); 318 int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, 319 struct nilfs_root **root); 320 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno); 321 322 /* gcinode.c */ 323 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64, 324 struct buffer_head **); 325 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64, 326 struct buffer_head **); 327 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *); 328 int nilfs_init_gcinode(struct inode *inode); 329 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs); 330 331 /* sysfs.c */ 332 int __init nilfs_sysfs_init(void); 333 void nilfs_sysfs_exit(void); 334 int nilfs_sysfs_create_device_group(struct super_block *); 335 void nilfs_sysfs_delete_device_group(struct the_nilfs *); 336 int nilfs_sysfs_create_snapshot_group(struct nilfs_root *); 337 void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *); 338 339 /* 340 * Inodes and files operations 341 */ 342 extern const struct file_operations nilfs_dir_operations; 343 extern const struct inode_operations nilfs_file_inode_operations; 344 extern const struct file_operations nilfs_file_operations; 345 extern const struct address_space_operations nilfs_aops; 346 extern const struct inode_operations nilfs_dir_inode_operations; 347 extern const struct inode_operations nilfs_special_inode_operations; 348 extern const struct inode_operations nilfs_symlink_inode_operations; 349 350 /* 351 * filesystem type 352 */ 353 extern struct file_system_type nilfs_fs_type; 354 355 356 #endif /* _NILFS_H */ 357