nilfs.h (12909B)
1/* SPDX-License-Identifier: GPL-2.0+ */ 2/* 3 * 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_assoc_inode: associated inode (B-tree node cache holder or back pointer) 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 */ 38struct 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 inode *i_assoc_inode; 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 67static 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 72static inline struct nilfs_inode_info * 73NILFS_BMAP_I(const struct nilfs_bmap *bmap) 74{ 75 return container_of(bmap, struct nilfs_inode_info, i_bmap_data); 76} 77 78/* 79 * Dynamic state flags of NILFS on-memory inode (i_state) 80 */ 81enum { 82 NILFS_I_NEW = 0, /* Inode is newly created */ 83 NILFS_I_DIRTY, /* The file is dirty */ 84 NILFS_I_QUEUED, /* inode is in dirty_files list */ 85 NILFS_I_BUSY, /* 86 * Inode is grabbed by a segment 87 * constructor 88 */ 89 NILFS_I_COLLECTED, /* All dirty blocks are collected */ 90 NILFS_I_UPDATED, /* The file has been written back */ 91 NILFS_I_INODE_SYNC, /* dsync is not allowed for inode */ 92 NILFS_I_BMAP, /* has bmap and btnode_cache */ 93 NILFS_I_GCINODE, /* inode for GC, on memory only */ 94 NILFS_I_BTNC, /* inode for btree node cache */ 95 NILFS_I_SHADOW, /* inode for shadowed page cache */ 96}; 97 98/* 99 * commit flags for nilfs_commit_super and nilfs_sync_super 100 */ 101enum { 102 NILFS_SB_COMMIT = 0, /* Commit a super block alternately */ 103 NILFS_SB_COMMIT_ALL /* Commit both super blocks */ 104}; 105 106/* 107 * Macros to check inode numbers 108 */ 109#define NILFS_MDT_INO_BITS \ 110 (BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) | \ 111 BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) | \ 112 BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO)) 113 114#define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS) 115 116#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino) 117 118#define NILFS_MDT_INODE(sb, ino) \ 119 ((ino) < NILFS_FIRST_INO(sb) && (NILFS_MDT_INO_BITS & BIT(ino))) 120#define NILFS_VALID_INODE(sb, ino) \ 121 ((ino) >= NILFS_FIRST_INO(sb) || (NILFS_SYS_INO_BITS & BIT(ino))) 122 123/** 124 * struct nilfs_transaction_info: context information for synchronization 125 * @ti_magic: Magic number 126 * @ti_save: Backup of journal_info field of task_struct 127 * @ti_flags: Flags 128 * @ti_count: Nest level 129 */ 130struct nilfs_transaction_info { 131 u32 ti_magic; 132 void *ti_save; 133 /* 134 * This should never be used. If it happens, 135 * one of other filesystems has a bug. 136 */ 137 unsigned short ti_flags; 138 unsigned short ti_count; 139}; 140 141/* ti_magic */ 142#define NILFS_TI_MAGIC 0xd9e392fb 143 144/* ti_flags */ 145#define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */ 146#define NILFS_TI_SYNC 0x0002 /* 147 * Force to construct segment at the 148 * end of transaction. 149 */ 150#define NILFS_TI_GC 0x0004 /* GC context */ 151#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */ 152#define NILFS_TI_WRITER 0x0010 /* Constructor context */ 153 154 155int nilfs_transaction_begin(struct super_block *, 156 struct nilfs_transaction_info *, int); 157int nilfs_transaction_commit(struct super_block *); 158void nilfs_transaction_abort(struct super_block *); 159 160static inline void nilfs_set_transaction_flag(unsigned int flag) 161{ 162 struct nilfs_transaction_info *ti = current->journal_info; 163 164 ti->ti_flags |= flag; 165} 166 167static inline int nilfs_test_transaction_flag(unsigned int flag) 168{ 169 struct nilfs_transaction_info *ti = current->journal_info; 170 171 if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC) 172 return 0; 173 return !!(ti->ti_flags & flag); 174} 175 176static inline int nilfs_doing_gc(void) 177{ 178 return nilfs_test_transaction_flag(NILFS_TI_GC); 179} 180 181static inline int nilfs_doing_construction(void) 182{ 183 return nilfs_test_transaction_flag(NILFS_TI_WRITER); 184} 185 186/* 187 * function prototype 188 */ 189#ifdef CONFIG_NILFS_POSIX_ACL 190#error "NILFS: not yet supported POSIX ACL" 191extern int nilfs_acl_chmod(struct inode *); 192extern int nilfs_init_acl(struct inode *, struct inode *); 193#else 194static inline int nilfs_acl_chmod(struct inode *inode) 195{ 196 return 0; 197} 198 199static inline int nilfs_init_acl(struct inode *inode, struct inode *dir) 200{ 201 inode->i_mode &= ~current_umask(); 202 return 0; 203} 204#endif 205 206#define NILFS_ATIME_DISABLE 207 208/* Flags that should be inherited by new inodes from their parent. */ 209#define NILFS_FL_INHERITED \ 210 (FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \ 211 FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\ 212 FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL) 213 214/* Mask out flags that are inappropriate for the given type of inode. */ 215static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags) 216{ 217 if (S_ISDIR(mode)) 218 return flags; 219 else if (S_ISREG(mode)) 220 return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL); 221 else 222 return flags & (FS_NODUMP_FL | FS_NOATIME_FL); 223} 224 225/* dir.c */ 226extern int nilfs_add_link(struct dentry *, struct inode *); 227extern ino_t nilfs_inode_by_name(struct inode *, const struct qstr *); 228extern int nilfs_make_empty(struct inode *, struct inode *); 229extern struct nilfs_dir_entry * 230nilfs_find_entry(struct inode *, const struct qstr *, struct page **); 231extern int nilfs_delete_entry(struct nilfs_dir_entry *, struct page *); 232extern int nilfs_empty_dir(struct inode *); 233extern struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct page **); 234extern void nilfs_set_link(struct inode *, struct nilfs_dir_entry *, 235 struct page *, struct inode *); 236 237/* file.c */ 238extern int nilfs_sync_file(struct file *, loff_t, loff_t, int); 239 240/* ioctl.c */ 241int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *m); 242int nilfs_fileattr_set(struct user_namespace *mnt_userns, 243 struct dentry *dentry, struct fileattr *fa); 244long nilfs_ioctl(struct file *, unsigned int, unsigned long); 245long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 246int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *, 247 void **); 248 249/* inode.c */ 250void nilfs_inode_add_blocks(struct inode *inode, int n); 251void nilfs_inode_sub_blocks(struct inode *inode, int n); 252extern struct inode *nilfs_new_inode(struct inode *, umode_t); 253extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int); 254extern void nilfs_set_inode_flags(struct inode *); 255extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *); 256extern void nilfs_write_inode_common(struct inode *, struct nilfs_inode *, int); 257struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, 258 unsigned long ino); 259struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, 260 unsigned long ino); 261struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, 262 unsigned long ino); 263extern struct inode *nilfs_iget_for_gc(struct super_block *sb, 264 unsigned long ino, __u64 cno); 265int nilfs_attach_btree_node_cache(struct inode *inode); 266void nilfs_detach_btree_node_cache(struct inode *inode); 267struct inode *nilfs_iget_for_shadow(struct inode *inode); 268extern void nilfs_update_inode(struct inode *, struct buffer_head *, int); 269extern void nilfs_truncate(struct inode *); 270extern void nilfs_evict_inode(struct inode *); 271extern int nilfs_setattr(struct user_namespace *, struct dentry *, 272 struct iattr *); 273extern void nilfs_write_failed(struct address_space *mapping, loff_t to); 274int nilfs_permission(struct user_namespace *mnt_userns, struct inode *inode, 275 int mask); 276int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh); 277extern int nilfs_inode_dirty(struct inode *); 278int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty); 279extern int __nilfs_mark_inode_dirty(struct inode *, int); 280extern void nilfs_dirty_inode(struct inode *, int flags); 281int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 282 __u64 start, __u64 len); 283static inline int nilfs_mark_inode_dirty(struct inode *inode) 284{ 285 return __nilfs_mark_inode_dirty(inode, I_DIRTY); 286} 287static inline int nilfs_mark_inode_dirty_sync(struct inode *inode) 288{ 289 return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC); 290} 291 292/* super.c */ 293extern struct inode *nilfs_alloc_inode(struct super_block *); 294 295__printf(2, 3) 296void __nilfs_msg(struct super_block *sb, const char *fmt, ...); 297extern __printf(3, 4) 298void __nilfs_error(struct super_block *sb, const char *function, 299 const char *fmt, ...); 300 301#ifdef CONFIG_PRINTK 302 303#define nilfs_msg(sb, level, fmt, ...) \ 304 __nilfs_msg(sb, level fmt, ##__VA_ARGS__) 305#define nilfs_error(sb, fmt, ...) \ 306 __nilfs_error(sb, __func__, fmt, ##__VA_ARGS__) 307 308#else 309 310#define nilfs_msg(sb, level, fmt, ...) \ 311 do { \ 312 no_printk(level fmt, ##__VA_ARGS__); \ 313 (void)(sb); \ 314 } while (0) 315#define nilfs_error(sb, fmt, ...) \ 316 do { \ 317 no_printk(fmt, ##__VA_ARGS__); \ 318 __nilfs_error(sb, "", " "); \ 319 } while (0) 320 321#endif /* CONFIG_PRINTK */ 322 323#define nilfs_crit(sb, fmt, ...) \ 324 nilfs_msg(sb, KERN_CRIT, fmt, ##__VA_ARGS__) 325#define nilfs_err(sb, fmt, ...) \ 326 nilfs_msg(sb, KERN_ERR, fmt, ##__VA_ARGS__) 327#define nilfs_warn(sb, fmt, ...) \ 328 nilfs_msg(sb, KERN_WARNING, fmt, ##__VA_ARGS__) 329#define nilfs_info(sb, fmt, ...) \ 330 nilfs_msg(sb, KERN_INFO, fmt, ##__VA_ARGS__) 331 332extern struct nilfs_super_block * 333nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **); 334extern int nilfs_store_magic_and_option(struct super_block *, 335 struct nilfs_super_block *, char *); 336extern int nilfs_check_feature_compatibility(struct super_block *, 337 struct nilfs_super_block *); 338extern void nilfs_set_log_cursor(struct nilfs_super_block *, 339 struct the_nilfs *); 340struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb, 341 int flip); 342int nilfs_commit_super(struct super_block *sb, int flag); 343int nilfs_cleanup_super(struct super_block *sb); 344int nilfs_resize_fs(struct super_block *sb, __u64 newsize); 345int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt, 346 struct nilfs_root **root); 347int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno); 348 349/* gcinode.c */ 350int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64, 351 struct buffer_head **); 352int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64, 353 struct buffer_head **); 354int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *); 355int nilfs_init_gcinode(struct inode *inode); 356void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs); 357 358/* sysfs.c */ 359int __init nilfs_sysfs_init(void); 360void nilfs_sysfs_exit(void); 361int nilfs_sysfs_create_device_group(struct super_block *); 362void nilfs_sysfs_delete_device_group(struct the_nilfs *); 363int nilfs_sysfs_create_snapshot_group(struct nilfs_root *); 364void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *); 365 366/* 367 * Inodes and files operations 368 */ 369extern const struct file_operations nilfs_dir_operations; 370extern const struct inode_operations nilfs_file_inode_operations; 371extern const struct file_operations nilfs_file_operations; 372extern const struct address_space_operations nilfs_aops; 373extern const struct inode_operations nilfs_dir_inode_operations; 374extern const struct inode_operations nilfs_special_inode_operations; 375extern const struct inode_operations nilfs_symlink_inode_operations; 376 377/* 378 * filesystem type 379 */ 380extern struct file_system_type nilfs_fs_type; 381 382 383#endif /* _NILFS_H */