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 struct pipe_inode_info;
  19
  20 /*
  21  * block_dev.c
  22  */
  23 #ifdef CONFIG_BLOCK
  24 extern void __init bdev_cache_init(void);
  25
  26 extern int __sync_blockdev(struct block_device *bdev, int wait);
  27 void iterate_bdevs(void (*)(struct block_device *, void *), void *);
  28 void emergency_thaw_bdev(struct super_block *sb);
  29 #else
  30 static inline void bdev_cache_init(void)
  31 {
  32 }
  33
  34 static inline int __sync_blockdev(struct block_device *bdev, int wait)
  35 {
  36         return 0;
  37 }
  38 static inline void iterate_bdevs(void (*f)(struct block_device *, void *),
  39                 void *arg)
  40 {
  41 }
  42 static inline int emergency_thaw_bdev(struct super_block *sb)
  43 {
  44         return 0;
  45 }
  46 #endif /* CONFIG_BLOCK */
  47
  48 /*
  49  * buffer.c
  50  */
  51 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  52                 get_block_t *get_block, struct iomap *iomap);
  53
  54 /*
  55  * char_dev.c
  56  */
  57 extern void __init chrdev_init(void);
  58
  59 /*
  60  * fs_context.c
  61  */
  62 extern const struct fs_context_operations legacy_fs_context_ops;
  63 extern int parse_monolithic_mount_data(struct fs_context *, void *);
  64 extern void fc_drop_locked(struct fs_context *);
  65 extern void vfs_clean_context(struct fs_context *fc);
  66 extern int finish_clean_context(struct fs_context *fc);
  67
  68 /*
  69  * namei.c
  70  */
  71 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  72                            struct path *path, struct path *root);
  73 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  74                            const char *, unsigned int, struct path *);
  75 long do_rmdir(int dfd, struct filename *name);
  76 long do_unlinkat(int dfd, struct filename *name);
  77 int may_linkat(struct user_namespace *mnt_userns, struct path *link);
  78 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
  79                  struct filename *newname, unsigned int flags);
  80
  81 /*
  82  * namespace.c
  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 int path_mount(const char *dev_name, struct path *path,
  97                 const char *type_page, unsigned long flags, void *data_page);
  98 int path_umount(struct path *path, int flags);
  99
 100 /*
 101  * fs_struct.c
 102  */
 103 extern void chroot_fs_refs(const struct path *, const struct path *);
 104
 105 /*
 106  * file_table.c
 107  */
 108 extern struct file *alloc_empty_file(int, const struct cred *);
 109 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 110
 111 /*
 112  * super.c
 113  */
 114 extern int reconfigure_super(struct fs_context *);
 115 extern bool trylock_super(struct super_block *sb);
 116 struct super_block *user_get_super(dev_t, bool excl);
 117 void put_super(struct super_block *sb);
 118 extern bool mount_capable(struct fs_context *);
 119
 120 /*
 121  * open.c
 122  */
 123 struct open_flags {
 124         int open_flag;
 125         umode_t mode;
 126         int acc_mode;
 127         int intent;
 128         int lookup_flags;
 129 };
 130 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 131                 const struct open_flags *op);
 132 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 133                 const char *, const struct open_flags *);
 134 extern struct open_how build_open_how(int flags, umode_t mode);
 135 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
 136 extern int __close_fd_get_file(unsigned int fd, struct file **res);
 137
 138 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 139 int chmod_common(const struct path *path, umode_t mode);
 140 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 141                 int flag);
 142 int chown_common(const struct path *path, uid_t user, gid_t group);
 143 extern int vfs_open(const struct path *, struct file *);
 144
 145 /*
 146  * inode.c
 147  */
 148 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 149 extern void inode_add_lru(struct inode *inode);
 150 extern int dentry_needs_remove_privs(struct dentry *dentry);
 151
 152 /*
 153  * fs-writeback.c
 154  */
 155 extern long get_nr_dirty_inodes(void);
 156 extern int invalidate_inodes(struct super_block *, bool);
 157
 158 /*
 159  * dcache.c
 160  */
 161 extern int d_set_mounted(struct dentry *dentry);
 162 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 163 extern struct dentry *d_alloc_cursor(struct dentry *);
 164 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
 165 extern char *simple_dname(struct dentry *, char *, int);
 166 extern void dput_to_list(struct dentry *, struct list_head *);
 167 extern void shrink_dentry_list(struct list_head *);
 168
 169 /*
 170  * read_write.c
 171  */
 172 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 173
 174 /*
 175  * pipe.c
 176  */
 177 extern const struct file_operations pipefifo_fops;
 178
 179 /*
 180  * fs_pin.c
 181  */
 182 extern void group_pin_kill(struct hlist_head *p);
 183 extern void mnt_pin_kill(struct mount *m);
 184
 185 /*
 186  * fs/nsfs.c
 187  */
 188 extern const struct dentry_operations ns_dentry_operations;
 189
 190 /* direct-io.c: */
 191 int sb_init_dio_done_wq(struct super_block *sb);
 192
 193 /*
 194  * fs/stat.c:
 195  */
 196 int do_statx(int dfd, const char __user *filename, unsigned flags,
 197              unsigned int mask, struct statx __user *buffer);
 198
 199 /*
 200  * fs/splice.c:
 201  */
 202 long splice_file_to_pipe(struct file *in,
 203                          struct pipe_inode_info *opipe,
 204                          loff_t *offset,
 205                          size_t len, unsigned int flags);