fs/internal.h

   1 /* fs/ internal definitions
   2  *
   3  * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 struct super_block;
  13 struct file_system_type;
  14 struct iomap;
  15 struct iomap_ops;
  16 struct linux_binprm;
  17 struct path;
  18 struct mount;
  19 struct shrink_control;
  20 struct fs_context;
  21
  22 /*
  23  * block_dev.c
  24  */
  25 #ifdef CONFIG_BLOCK
  26 extern void __init bdev_cache_init(void);
  27
  28 extern int __sync_blockdev(struct block_device *bdev, int wait);
  29
  30 #else
  31 static inline void bdev_cache_init(void)
  32 {
  33 }
  34
  35 static inline int __sync_blockdev(struct block_device *bdev, int wait)
  36 {
  37         return 0;
  38 }
  39 #endif
  40
  41 /*
  42  * buffer.c
  43  */
  44 extern void guard_bio_eod(int rw, struct bio *bio);
  45 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  46                 get_block_t *get_block, struct iomap *iomap);
  47 void __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
  48                 struct page *page);
  49
  50 /*
  51  * char_dev.c
  52  */
  53 extern void __init chrdev_init(void);
  54
  55 /*
  56  * fs_context.c
  57  */
  58 extern const struct fs_context_operations legacy_fs_context_ops;
  59 extern int parse_monolithic_mount_data(struct fs_context *, void *);
  60 extern void fc_drop_locked(struct fs_context *);
  61 extern void vfs_clean_context(struct fs_context *fc);
  62 extern int finish_clean_context(struct fs_context *fc);
  63
  64 /*
  65  * namei.c
  66  */
  67 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  68                            struct path *path, struct path *root);
  69 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  70 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  71                            const char *, unsigned int, struct path *);
  72 long do_mknodat(int dfd, const char __user *filename, umode_t mode,
  73                 unsigned int dev);
  74 long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
  75 long do_rmdir(int dfd, const char __user *pathname);
  76 long do_unlinkat(int dfd, struct filename *name);
  77 long do_symlinkat(const char __user *oldname, int newdfd,
  78                   const char __user *newname);
  79 int do_linkat(int olddfd, const char __user *oldname, int newdfd,
  80               const char __user *newname, int flags);
  81
  82 /*
  83  * namespace.c
  84  */
  85 extern void *copy_mount_options(const void __user *);
  86 extern char *copy_mount_string(const void __user *);
  87
  88 extern struct vfsmount *lookup_mnt(const struct path *);
  89 extern int finish_automount(struct vfsmount *, struct path *);
  90
  91 extern int sb_prepare_remount_readonly(struct super_block *);
  92
  93 extern void __init mnt_init(void);
  94
  95 extern int __mnt_want_write_file(struct file *);
  96 extern void __mnt_drop_write_file(struct file *);
  97
  98 extern void dissolve_on_fput(struct vfsmount *);
  99 /*
 100  * fs_struct.c
 101  */
 102 extern void chroot_fs_refs(const struct path *, const struct path *);
 103
 104 /*
 105  * file_table.c
 106  */
 107 extern struct file *alloc_empty_file(int, const struct cred *);
 108 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 109
 110 /*
 111  * super.c
 112  */
 113 extern int reconfigure_super(struct fs_context *);
 114 extern bool trylock_super(struct super_block *sb);
 115 extern struct super_block *user_get_super(dev_t);
 116
 117 /*
 118  * open.c
 119  */
 120 struct open_flags {
 121         int open_flag;
 122         umode_t mode;
 123         int acc_mode;
 124         int intent;
 125         int lookup_flags;
 126 };
 127 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 128                 const struct open_flags *op);
 129 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 130                 const char *, const struct open_flags *);
 131
 132 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 133 long do_faccessat(int dfd, const char __user *filename, int mode);
 134 int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
 135 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 136                 int flag);
 137
 138 extern int vfs_open(const struct path *, struct file *);
 139
 140 /*
 141  * inode.c
 142  */
 143 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 144 extern void inode_add_lru(struct inode *inode);
 145 extern int dentry_needs_remove_privs(struct dentry *dentry);
 146
 147 /*
 148  * fs-writeback.c
 149  */
 150 extern void inode_io_list_del(struct inode *inode);
 151
 152 extern long get_nr_dirty_inodes(void);
 153 extern int invalidate_inodes(struct super_block *, bool);
 154
 155 /*
 156  * dcache.c
 157  */
 158 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 159 extern int d_set_mounted(struct dentry *dentry);
 160 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 161 extern struct dentry *d_alloc_cursor(struct dentry *);
 162 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
 163
 164 /*
 165  * read_write.c
 166  */
 167 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 168
 169 /*
 170  * pipe.c
 171  */
 172 extern const struct file_operations pipefifo_fops;
 173
 174 /*
 175  * fs_pin.c
 176  */
 177 extern void group_pin_kill(struct hlist_head *p);
 178 extern void mnt_pin_kill(struct mount *m);
 179
 180 /*
 181  * fs/nsfs.c
 182  */
 183 extern const struct dentry_operations ns_dentry_operations;
 184
 185 /*
 186  * fs/ioctl.c
 187  */
 188 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
 189                     unsigned long arg);
 190
 191 /*
 192  * iomap support:
 193  */
 194 typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
 195                 void *data, struct iomap *iomap);
 196
 197 loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
 198                 unsigned flags, const struct iomap_ops *ops, void *data,
 199                 iomap_actor_t actor);
 200
 201 /* direct-io.c: */
 202 int sb_init_dio_done_wq(struct super_block *sb);