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 struct user_namespace;
  18
  19 /*
  20  * block_dev.c
  21  */
  22 #ifdef CONFIG_BLOCK
  23 extern void __init bdev_cache_init(void);
  24
  25 extern int __sync_blockdev(struct block_device *bdev, int wait);
  26
  27 #else
  28 static inline void bdev_cache_init(void)
  29 {
  30 }
  31
  32 static inline int __sync_blockdev(struct block_device *bdev, int wait)
  33 {
  34         return 0;
  35 }
  36 #endif
  37
  38 /*
  39  * buffer.c
  40  */
  41 extern void guard_bio_eod(int rw, struct bio *bio);
  42 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  43                 get_block_t *get_block, struct iomap *iomap);
  44
  45 /*
  46  * char_dev.c
  47  */
  48 extern void __init chrdev_init(void);
  49
  50 /*
  51  * fs_context.c
  52  */
  53 extern const struct fs_context_operations legacy_fs_context_ops;
  54 extern int parse_monolithic_mount_data(struct fs_context *, void *);
  55 extern void fc_drop_locked(struct fs_context *);
  56 extern void vfs_clean_context(struct fs_context *fc);
  57 extern int finish_clean_context(struct fs_context *fc);
  58
  59 /*
  60  * namei.c
  61  */
  62 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  63                            struct path *path, struct path *root);
  64 extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
  65 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  66                            const char *, unsigned int, struct path *);
  67 long do_mknodat(int dfd, const char __user *filename, umode_t mode,
  68                 unsigned int dev);
  69 long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
  70 long do_rmdir(int dfd, const char __user *pathname);
  71 long do_unlinkat(int dfd, struct filename *name);
  72 long do_symlinkat(const char __user *oldname, int newdfd,
  73                   const char __user *newname);
  74 int do_linkat(int olddfd, const char __user *oldname, int newdfd,
  75               const char __user *newname, int flags);
  76
  77 /*
  78  * namespace.c
  79  */
  80 extern void *copy_mount_options(const void __user *);
  81 extern char *copy_mount_string(const void __user *);
  82
  83 extern struct vfsmount *lookup_mnt(const struct path *);
  84 extern int finish_automount(struct vfsmount *, struct path *);
  85
  86 extern int sb_prepare_remount_readonly(struct super_block *);
  87
  88 extern void __init mnt_init(void);
  89
  90 extern int __mnt_want_write_file(struct file *);
  91 extern void __mnt_drop_write_file(struct file *);
  92
  93 extern void dissolve_on_fput(struct vfsmount *);
  94 /*
  95  * fs_struct.c
  96  */
  97 extern void chroot_fs_refs(const struct path *, const struct path *);
  98
  99 /*
 100  * file_table.c
 101  */
 102 extern struct file *alloc_empty_file(int, const struct cred *);
 103 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 104
 105 /*
 106  * super.c
 107  */
 108 extern int reconfigure_super(struct fs_context *);
 109 extern bool trylock_super(struct super_block *sb);
 110 extern struct super_block *user_get_super(dev_t);
 111 extern bool mount_capable(struct fs_context *);
 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 extern char *simple_dname(struct dentry *, char *, int);
 160 extern void dput_to_list(struct dentry *, struct list_head *);
 161 extern void shrink_dentry_list(struct list_head *);
 162
 163 /*
 164  * read_write.c
 165  */
 166 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 167
 168 /*
 169  * pipe.c
 170  */
 171 extern const struct file_operations pipefifo_fops;
 172
 173 /*
 174  * fs_pin.c
 175  */
 176 extern void group_pin_kill(struct hlist_head *p);
 177 extern void mnt_pin_kill(struct mount *m);
 178
 179 /*
 180  * fs/nsfs.c
 181  */
 182 extern const struct dentry_operations ns_dentry_operations;
 183
 184 /*
 185  * fs/ioctl.c
 186  */
 187 extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
 188                     unsigned long arg);
 189
 190 /* direct-io.c: */
 191 int sb_init_dio_done_wq(struct super_block *sb);