fs/internal.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* fs/ internal definitions
   3  *
   4  * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   5  * Written by David Howells (dhowells@redhat.com)
   6  */
   7
   8 struct super_block;
   9 struct file_system_type;
  10 struct iomap;
  11 struct iomap_ops;
  12 struct linux_binprm;
  13 struct path;
  14 struct mount;
  15 struct shrink_control;
  16 struct fs_context;
  17
  18 /*
  19  * block_dev.c
  20  */
  21 #ifdef CONFIG_BLOCK
  22 extern void __init bdev_cache_init(void);
  23
  24 extern int __sync_blockdev(struct block_device *bdev, int wait);
  25
  26 #else
  27 static inline void bdev_cache_init(void)
  28 {
  29 }
  30
  31 static inline int __sync_blockdev(struct block_device *bdev, int wait)
  32 {
  33         return 0;
  34 }
  35 #endif
  36
  37 /*
  38  * buffer.c
  39  */
  40 extern void guard_bio_eod(int rw, struct bio *bio);
  41 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  42                 get_block_t *get_block, struct iomap *iomap);
  43 void __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
  44                 struct page *page);
  45
  46 /*
  47  * char_dev.c
  48  */
  49 extern void __init chrdev_init(void);
  50
  51 /*
  52  * fs_context.c
  53  */
  54 extern const struct fs_context_operations legacy_fs_context_ops;
  55 extern int parse_monolithic_mount_data(struct fs_context *, void *);
  56 extern void fc_drop_locked(struct fs_context *);
  57 extern void vfs_clean_context(struct fs_context *fc);
  58 extern int finish_clean_context(struct fs_context *fc);
  59
  60 /*
  61  * namei.c
  62  */
  63 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  64                            struct path *path, struct path *root);
  65 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  66 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  67                            const char *, unsigned int, struct path *);
  68 long do_mknodat(int dfd, const char __user *filename, umode_t mode,
  69                 unsigned int dev);
  70 long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
  71 long do_rmdir(int dfd, const char __user *pathname);
  72 long do_unlinkat(int dfd, struct filename *name);
  73 long do_symlinkat(const char __user *oldname, int newdfd,
  74                   const char __user *newname);
  75 int do_linkat(int olddfd, const char __user *oldname, int newdfd,
  76               const char __user *newname, int flags);
  77
  78 /*
  79  * namespace.c
  80  */
  81 extern void *copy_mount_options(const void __user *);
  82 extern char *copy_mount_string(const void __user *);
  83
  84 extern struct vfsmount *lookup_mnt(const struct path *);
  85 extern int finish_automount(struct vfsmount *, struct path *);
  86
  87 extern int sb_prepare_remount_readonly(struct super_block *);
  88
  89 extern void __init mnt_init(void);
  90
  91 extern int __mnt_want_write_file(struct file *);
  92 extern void __mnt_drop_write_file(struct file *);
  93
  94 extern void dissolve_on_fput(struct vfsmount *);
  95 /*
  96  * fs_struct.c
  97  */
  98 extern void chroot_fs_refs(const struct path *, const struct path *);
  99
 100 /*
 101  * file_table.c
 102  */
 103 extern struct file *alloc_empty_file(int, const struct cred *);
 104 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 105
 106 /*
 107  * super.c
 108  */
 109 extern int reconfigure_super(struct fs_context *);
 110 extern bool trylock_super(struct super_block *sb);
 111 extern struct super_block *user_get_super(dev_t);
 112
 113 /*
 114  * open.c
 115  */
 116 struct open_flags {
 117         int open_flag;
 118         umode_t mode;
 119         int acc_mode;
 120         int intent;
 121         int lookup_flags;
 122 };
 123 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 124                 const struct open_flags *op);
 125 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 126                 const char *, const struct open_flags *);
 127
 128 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 129 long do_faccessat(int dfd, const char __user *filename, int mode);
 130 int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
 131 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 132                 int flag);
 133
 134 extern int vfs_open(const struct path *, struct file *);
 135
 136 /*
 137  * inode.c
 138  */
 139 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 140 extern void inode_add_lru(struct inode *inode);
 141 extern int dentry_needs_remove_privs(struct dentry *dentry);
 142
 143 /*
 144  * fs-writeback.c
 145  */
 146 extern void inode_io_list_del(struct inode *inode);
 147
 148 extern long get_nr_dirty_inodes(void);
 149 extern int invalidate_inodes(struct super_block *, bool);
 150
 151 /*
 152  * dcache.c
 153  */
 154 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 155 extern int d_set_mounted(struct dentry *dentry);
 156 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 157 extern struct dentry *d_alloc_cursor(struct dentry *);
 158 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
 159
 160 /*
 161  * read_write.c
 162  */
 163 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 164
 165 /*
 166  * pipe.c
 167  */
 168 extern const struct file_operations pipefifo_fops;
 169
 170 /*
 171  * fs_pin.c
 172  */
 173 extern void group_pin_kill(struct hlist_head *p);
 174 extern void mnt_pin_kill(struct mount *m);
 175
 176 /*
 177  * fs/nsfs.c
 178  */
 179 extern const struct dentry_operations ns_dentry_operations;
 180
 181 /*
 182  * fs/ioctl.c
 183  */
 184 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
 185                     unsigned long arg);
 186
 187 /*
 188  * iomap support:
 189  */
 190 typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
 191                 void *data, struct iomap *iomap);
 192
 193 loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
 194                 unsigned flags, const struct iomap_ops *ops, void *data,
 195                 iomap_actor_t actor);
 196
 197 /* direct-io.c: */
 198 int sb_init_dio_done_wq(struct super_block *sb);