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 int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  42                 get_block_t *get_block, struct iomap *iomap);
  43
  44 /*
  45  * char_dev.c
  46  */
  47 extern void __init chrdev_init(void);
  48
  49 /*
  50  * fs_context.c
  51  */
  52 extern const struct fs_context_operations legacy_fs_context_ops;
  53 extern int parse_monolithic_mount_data(struct fs_context *, void *);
  54 extern void fc_drop_locked(struct fs_context *);
  55 extern void vfs_clean_context(struct fs_context *fc);
  56 extern int finish_clean_context(struct fs_context *fc);
  57
  58 /*
  59  * namei.c
  60  */
  61 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  62                            struct path *path, struct path *root);
  63 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  64                            const char *, unsigned int, struct path *);
  65 long do_mknodat(int dfd, const char __user *filename, umode_t mode,
  66                 unsigned int dev);
  67 long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
  68 long do_rmdir(int dfd, const char __user *pathname);
  69 long do_unlinkat(int dfd, struct filename *name);
  70 long do_symlinkat(const char __user *oldname, int newdfd,
  71                   const char __user *newname);
  72 int do_linkat(int olddfd, const char __user *oldname, int newdfd,
  73               const char __user *newname, int flags);
  74
  75 /*
  76  * namespace.c
  77  */
  78 extern void *copy_mount_options(const void __user *);
  79 extern char *copy_mount_string(const void __user *);
  80
  81 extern struct vfsmount *lookup_mnt(const struct path *);
  82 extern int finish_automount(struct vfsmount *, struct path *);
  83
  84 extern int sb_prepare_remount_readonly(struct super_block *);
  85
  86 extern void __init mnt_init(void);
  87
  88 extern int __mnt_want_write_file(struct file *);
  89 extern void __mnt_drop_write_file(struct file *);
  90
  91 extern void dissolve_on_fput(struct vfsmount *);
  92 /*
  93  * fs_struct.c
  94  */
  95 extern void chroot_fs_refs(const struct path *, const struct path *);
  96
  97 /*
  98  * file_table.c
  99  */
 100 extern struct file *alloc_empty_file(int, const struct cred *);
 101 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 102
 103 /*
 104  * super.c
 105  */
 106 extern int reconfigure_super(struct fs_context *);
 107 extern bool trylock_super(struct super_block *sb);
 108 extern struct super_block *user_get_super(dev_t);
 109 extern bool mount_capable(struct fs_context *);
 110
 111 /*
 112  * open.c
 113  */
 114 struct open_flags {
 115         int open_flag;
 116         umode_t mode;
 117         int acc_mode;
 118         int intent;
 119         int lookup_flags;
 120 };
 121 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 122                 const struct open_flags *op);
 123 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
 124                 const char *, const struct open_flags *);
 125 extern struct open_how build_open_how(int flags, umode_t mode);
 126 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
 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 int d_set_mounted(struct dentry *dentry);
 155 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 156 extern struct dentry *d_alloc_cursor(struct dentry *);
 157 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
 158 extern char *simple_dname(struct dentry *, char *, int);
 159 extern void dput_to_list(struct dentry *, struct list_head *);
 160 extern void shrink_dentry_list(struct list_head *);
 161
 162 /*
 163  * read_write.c
 164  */
 165 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 166
 167 /*
 168  * pipe.c
 169  */
 170 extern const struct file_operations pipefifo_fops;
 171
 172 /*
 173  * fs_pin.c
 174  */
 175 extern void group_pin_kill(struct hlist_head *p);
 176 extern void mnt_pin_kill(struct mount *m);
 177
 178 /*
 179  * fs/nsfs.c
 180  */
 181 extern const struct dentry_operations ns_dentry_operations;
 182
 183 /* direct-io.c: */
 184 int sb_init_dio_done_wq(struct super_block *sb);
 185
 186 /*
 187  * fs/stat.c:
 188  */
 189 unsigned vfs_stat_set_lookup_flags(unsigned *lookup_flags, int flags);
 190 int cp_statx(const struct kstat *stat, struct statx __user *buffer);