fs/nilfs2/nilfs.h

   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 */