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 int __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 int parse_monolithic_mount_data(struct fs_context *, void *);
  59 extern void fc_drop_locked(struct fs_context *);
  60
  61 /*
  62  * namei.c
  63  */
  64 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  65                            struct path *path, struct path *root);
  66 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  67 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  68                            const char *, unsigned int, struct path *);
  69 long do_mknodat(int dfd, const char __user *filename, umode_t mode,
  70                 unsigned int dev);
  71 long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
  72 long do_rmdir(int dfd, const char __user *pathname);
  73 long do_unlinkat(int dfd, struct filename *name);
  74 long do_symlinkat(const char __user *oldname, int newdfd,
  75                   const char __user *newname);
  76 int do_linkat(int olddfd, const char __user *oldname, int newdfd,
  77               const char __user *newname, int flags);
  78
  79 /*
  80  * namespace.c
  81  */
  82 extern void *copy_mount_options(const void __user *);
  83 extern char *copy_mount_string(const void __user *);
  84
  85 extern struct vfsmount *lookup_mnt(const struct path *);
  86 extern int finish_automount(struct vfsmount *, struct path *);
  87
  88 extern int sb_prepare_remount_readonly(struct super_block *);
  89
  90 extern void __init mnt_init(void);
  91
  92 extern int __mnt_want_write(struct vfsmount *);
  93 extern int __mnt_want_write_file(struct file *);
  94 extern void __mnt_drop_write(struct vfsmount *);
  95 extern void __mnt_drop_write_file(struct file *);
  96
  97 /*
  98  * fs_struct.c
  99  */
 100 extern void chroot_fs_refs(const struct path *, const struct path *);
 101
 102 /*
 103  * file_table.c
 104  */
 105 extern struct file *alloc_empty_file(int, const struct cred *);
 106 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 107
 108 /*
 109  * super.c
 110  */
 111 extern int reconfigure_super(struct fs_context *);
 112 extern bool trylock_super(struct super_block *sb);
 113 extern struct super_block *user_get_super(dev_t);
 114
 115 /*
 116  * open.c
 117  */
 118 struct open_flags {
 119         int open_flag;
 120         umode_t mode;
 121         int acc_mode;
 122         int intent;
 123         int lookup_flags;
 124 };
 125 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 126                 const struct open_flags *op);
 127 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 128                 const char *, const struct open_flags *);
 129
 130 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 131 long do_faccessat(int dfd, const char __user *filename, int mode);
 132 int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
 133 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 134                 int flag);
 135
 136 extern int vfs_open(const struct path *, struct file *);
 137
 138 /*
 139  * inode.c
 140  */
 141 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 142 extern void inode_add_lru(struct inode *inode);
 143 extern int dentry_needs_remove_privs(struct dentry *dentry);
 144
 145 /*
 146  * fs-writeback.c
 147  */
 148 extern void inode_io_list_del(struct inode *inode);
 149
 150 extern long get_nr_dirty_inodes(void);
 151 extern int invalidate_inodes(struct super_block *, bool);
 152
 153 /*
 154  * dcache.c
 155  */
 156 extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
 157 extern int d_set_mounted(struct dentry *dentry);
 158 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 159 extern struct dentry *d_alloc_cursor(struct dentry *);
 160
 161 /*
 162  * read_write.c
 163  */
 164 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 165
 166 /*
 167  * pipe.c
 168  */
 169 extern const struct file_operations pipefifo_fops;
 170
 171 /*
 172  * fs_pin.c
 173  */
 174 extern void group_pin_kill(struct hlist_head *p);
 175 extern void mnt_pin_kill(struct mount *m);
 176
 177 /*
 178  * fs/nsfs.c
 179  */
 180 extern const struct dentry_operations ns_dentry_operations;
 181
 182 /*
 183  * fs/ioctl.c
 184  */
 185 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
 186                     unsigned long arg);
 187
 188 /*
 189  * iomap support:
 190  */
 191 typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
 192                 void *data, struct iomap *iomap);
 193
 194 loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
 195                 unsigned flags, const struct iomap_ops *ops, void *data,
 196                 iomap_actor_t actor);
 197
 198 /* direct-io.c: */
 199 int sb_init_dio_done_wq(struct super_block *sb);