1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * nilfs.h - NILFS local header file. 4 * 5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. 6 * 7 * Written by Koji Sato and Ryusuke Konishi. 8 */ 9 10 #ifndef _NILFS_H 11 #define _NILFS_H 12 13 #include <linux/kernel.h> 14 #include <linux/buffer_head.h> 15 #include <linux/spinlock.h> 16 #include <linux/blkdev.h> 17 #include <linux/nilfs2_api.h> 18 #include <linux/nilfs2_ondisk.h> 19 #include "the_nilfs.h" 20 #include "bmap.h" 21 22 /** 23 * struct nilfs_inode_info - nilfs inode data in memory 24 * @i_flags: inode flags 25 * @i_state: dynamic state flags 26 * @i_bmap: pointer on i_bmap_data 27 * @i_bmap_data: raw block mapping 28 * @i_xattr: <TODO> 29 * @i_dir_start_lookup: page index of last successful search 30 * @i_cno: checkpoint number for GC inode 31 * @i_btnode_cache: cached pages of b-tree nodes 32 * @i_dirty: list for connecting dirty files 33 * @xattr_sem: semaphore for extended attributes processing 34 * @i_bh: buffer contains disk inode 35 * @i_root: root object of the current filesystem tree 36 * @vfs_inode: VFS inode object 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; /* 60 * i_bh contains a new or dirty 61 * disk inode. 62 */ 63 struct nilfs_root *i_root; 64 struct inode vfs_inode; 65 }; 66 67 static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode) 68 { 69 return container_of(inode, struct nilfs_inode_info, vfs_inode); 70 } 71 72 static inline struct nilfs_inode_info * 73 NILFS_BMAP_I(const struct nilfs_bmap *bmap) 74 { 75 return container_of(bmap, struct nilfs_inode_info, i_bmap_data); 76 } 77 78 static inline struct inode *NILFS_BTNC_I(struct address_space *btnc) 79 { 80 struct nilfs_inode_info *ii = 81 container_of(btnc, struct nilfs_inode_info, i_btnode_cache); 82 return &ii->vfs_inode; 83 } 84 85 /* 86 * Dynamic state flags of NILFS on-memory inode (i_state) 87 */ 88 enum { 89 NILFS_I_NEW = 0, /* Inode is newly created */ 90 NILFS_I_DIRTY, /* The file is dirty */ 91 NILFS_I_QUEUED, /* inode is in dirty_files list */ 92 NILFS_I_BUSY, /* 93 * Inode is grabbed by a segment 94 * constructor 95 */ 96 NILFS_I_COLLECTED, /* All dirty blocks are collected */ 97 NILFS_I_UPDATED, /* The file has been written back */ 98 NILFS_I_INODE_SYNC, /* dsync is not allowed for inode */ 99 NILFS_I_BMAP, /* has bmap and btnode_cache */ 100 NILFS_I_GCINODE, /* inode for GC, on memory only */ 101 }; 102 103 /* 104 * commit flags for nilfs_commit_super and nilfs_sync_super 105 */ 106 enum { 107 NILFS_SB_COMMIT = 0, /* Commit a super block alternately */ 108 NILFS_SB_COMMIT_ALL /* Commit both super blocks */ 109 }; 110 111 /* 112 * Macros to check inode numbers 113 */ 114 #define NILFS_MDT_INO_BITS \ 115 (BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) | \ 116 BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) | \ 117 BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO)) 118 119 #define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS) 120 121 #define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino) 122 123 #define NILFS_MDT_INODE(sb, ino) \ 124 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino))) 125 #define NILFS_VALID_INODE(sb, ino) \ 126 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino))) 127 128 /** 129 * struct nilfs_transaction_info: context information for synchronization 130 * @ti_magic: Magic number 131 * @ti_save: Backup of journal_info field of task_struct 132 * @ti_flags: Flags 133 * @ti_count: Nest level 134 */ 135 struct nilfs_transaction_info { 136 u32 ti_magic; 137 void *ti_save; 138 /* 139 * This should never be used. If it happens, 140 * one of other filesystems has a bug. 141 */ 142 unsigned short ti_flags; 143 unsigned short ti_count; 144 }; 145 146 /* ti_magic */ 147 #define NILFS_TI_MAGIC 0xd9e392fb 148 149 /* ti_flags */ 150 #define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */ 151 #define NILFS_TI_SYNC 0x0002 /* 152 * Force to construct segment at the 153 * end of transaction. 154 */ 155 #define NILFS_TI_GC 0x0004 /* GC context */ 156 #define NILFS_TI_COMMIT 0x0008 /* Change happened or not */ 157 #define NILFS_TI_WRITER 0x0010 /* Constructor context */ 158 159 160 int nilfs_transaction_begin(struct super_block *, 161 struct nilfs_transaction_info *, int); 162 int nilfs_transaction_commit(struct super_block *); 163 void nilfs_transaction_abort(struct super_block *); 164 165 static inline void nilfs_set_transaction_flag(unsigned int flag) 166 { 167 struct nilfs_transaction_info *ti = current->journal_info; 168 169 ti->ti_flags |= flag; 170 } 171 172 static inline int nilfs_test_transaction_flag(unsigned int flag) 173 { 174 struct nilfs_transaction_info *ti = current->journal_info; 175 176 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC) 177 return 0; 178 return !!(ti->ti_flags & flag); 179 } 180 181 static inline int nilfs_doing_gc(void) 182 { 183 return nilfs_test_transaction_flag(NILFS_TI_GC); 184 } 185 186 static inline int nilfs_doing_construction(void) 187 { 188 return nilfs_test_transaction_flag(NILFS_TI_WRITER); 189 } 190 191 /* 192 * function prototype 193 */ 194 #ifdef CONFIG_NILFS_POSIX_ACL 195 #error "NILFS: not yet supported POSIX ACL" 196 extern int nilfs_acl_chmod(struct inode *); 197 extern int nilfs_init_acl(struct inode *, struct inode *); 198 #else 199 static inline int nilfs_acl_chmod(struct inode *inode) 200 { 201 return 0; 202 } 203 204 static inline int nilfs_init_acl(struct inode *inode, struct inode *dir) 205 { 206 inode->i_mode &= ~current_umask(); 207 return 0; 208 } 209 #endif 210 211 #define NILFS_ATIME_DISABLE 212 213 /* Flags that should be inherited by new inodes from their parent. */ 214 #define NILFS_FL_INHERITED \ 215 (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \ 216 FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\ 217 FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL) 218 219 /* Mask out flags that are inappropriate for the given type of inode. */ 220 static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags) 221 { 222 if (S_ISDIR(mode)) 223 return flags; 224 else if (S_ISREG(mode)) 225 return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL); 226 else 227 return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 228 } 229 230 /* dir.c */ 231 extern int nilfs_add_link(struct dentry *, struct inode *); 232 extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *); 233 extern int nilfs_make_empty(struct inode *, struct inode *); 234 extern struct nilfs_dir_entry * 235 nilfs_find_entry(struct inode *, const struct qstr *, struct page **); 236 extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *); 237 extern int nilfs_empty_dir(struct inode *); 238 extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **); 239 extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *, 240 struct page *, struct inode *); 241 242 /* file.c */ 243 extern int nilfs_sync_file(struct file *, loff_t, loff_t, int); 244 245 /* ioctl.c */ 246 long nilfs_ioctl(struct file *, unsigned int, unsigned long); 247 long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 248 int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *, 249 void **); 250 251 /* inode.c */ 252 void nilfs_inode_add_blocks(struct inode *inode, int n); 253 void nilfs_inode_sub_blocks(struct inode *inode, int n); 254 extern struct inode *nilfs_new_inode(struct inode *, umode_t); 255 extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int); 256 extern void nilfs_set_inode_flags(struct inode *); 257 extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *); 258 extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int); 259 struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, 260 unsigned long ino); 261 struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, 262 unsigned long ino); 263 struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, 264 unsigned long ino); 265 extern struct inode *nilfs_iget_for_gc(struct super_block *sb, 266 unsigned long ino, __u64 cno); 267 extern void nilfs_update_inode(struct inode *, struct buffer_head *, int); 268 extern void nilfs_truncate(struct inode *); 269 extern void nilfs_evict_inode(struct inode *); 270 extern int nilfs_setattr(struct dentry *, struct iattr *); 271 extern void nilfs_write_failed(struct address_space *mapping, loff_t to); 272 int nilfs_permission(struct inode *inode, int mask); 273 int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh); 274 extern int nilfs_inode_dirty(struct inode *); 275 int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty); 276 extern int __nilfs_mark_inode_dirty(struct inode *, int); 277 extern void nilfs_dirty_inode(struct inode *, int flags); 278 int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 279 __u64 start, __u64 len); 280 static inline int nilfs_mark_inode_dirty(struct inode *inode) 281 { 282 return __nilfs_mark_inode_dirty(inode, I_DIRTY); 283 } 284 static inline int nilfs_mark_inode_dirty_sync(struct inode *inode) 285 { 286 return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC); 287 } 288 289 /* super.c */ 290 extern struct inode *nilfs_alloc_inode(struct super_block *); 291 292 extern __printf(3, 4) 293 void __nilfs_msg(struct super_block *sb, const char *level, 294 const char *fmt, ...); 295 extern __printf(3, 4) 296 void __nilfs_error(struct super_block *sb, const char *function, 297 const char *fmt, ...); 298 299 #ifdef CONFIG_PRINTK 300 301 #define nilfs_msg(sb, level, fmt, ...) \ 302 __nilfs_msg(sb, level, fmt, ##__VA_ARGS__) 303 #define nilfs_error(sb, fmt, ...) \ 304 __nilfs_error(sb, __func__, fmt, ##__VA_ARGS__) 305 306 #else 307 308 #define nilfs_msg(sb, level, fmt, ...) \ 309 do { \ 310 no_printk(fmt, ##__VA_ARGS__); \ 311 (void)(sb); \ 312 } while (0) 313 #define nilfs_error(sb, fmt, ...) \ 314 do { \ 315 no_printk(fmt, ##__VA_ARGS__); \ 316 __nilfs_error(sb, "", " "); \ 317 } while (0) 318 319 #endif /* CONFIG_PRINTK */ 320 321 extern struct nilfs_super_block * 322 nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **); 323 extern int nilfs_store_magic_and_option(struct super_block *, 324 struct nilfs_super_block *, char *); 325 extern int nilfs_check_feature_compatibility(struct super_block *, 326 struct nilfs_super_block *); 327 extern void nilfs_set_log_cursor(struct nilfs_super_block *, 328 struct the_nilfs *); 329 struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, 330 int flip); 331 int nilfs_commit_super(struct super_block *sb, int flag); 332 int nilfs_cleanup_super(struct super_block *sb); 333 int nilfs_resize_fs(struct super_block *sb, __u64 newsize); 334 int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, 335 struct nilfs_root **root); 336 int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno); 337 338 /* gcinode.c */ 339 int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64, 340 struct buffer_head **); 341 int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64, 342 struct buffer_head **); 343 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *); 344 int nilfs_init_gcinode(struct inode *inode); 345 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs); 346 347 /* sysfs.c */ 348 int __init nilfs_sysfs_init(void); 349 void nilfs_sysfs_exit(void); 350 int nilfs_sysfs_create_device_group(struct super_block *); 351 void nilfs_sysfs_delete_device_group(struct the_nilfs *); 352 int nilfs_sysfs_create_snapshot_group(struct nilfs_root *); 353 void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *); 354 355 /* 356 * Inodes and files operations 357 */ 358 extern const struct file_operations nilfs_dir_operations; 359 extern const struct inode_operations nilfs_file_inode_operations; 360 extern const struct file_operations nilfs_file_operations; 361 extern const struct address_space_operations nilfs_aops; 362 extern const struct inode_operations nilfs_dir_inode_operations; 363 extern const struct inode_operations nilfs_special_inode_operations; 364 extern const struct inode_operations nilfs_symlink_inode_operations; 365 366 /* 367 * filesystem type 368 */ 369 extern struct file_system_type nilfs_fs_type; 370 371 372 #endif /* _NILFS_H */ 373