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 void iterate_bdevs(void (*)(struct block_device *, void *), void *);
  27 void emergency_thaw_bdev(struct super_block *sb);
  28 void bd_forget(struct inode *inode);
  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 static inline void bd_forget(struct inode *inode)
  47 {
  48 }
  49 #endif /* CONFIG_BLOCK */
  50
  51 /*
  52  * buffer.c
  53  */
  54 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  55                 get_block_t *get_block, struct iomap *iomap);
  56
  57 /*
  58  * char_dev.c
  59  */
  60 extern void __init chrdev_init(void);
  61
  62 /*
  63  * fs_context.c
  64  */
  65 extern const struct fs_context_operations legacy_fs_context_ops;
  66 extern int parse_monolithic_mount_data(struct fs_context *, void *);
  67 extern void fc_drop_locked(struct fs_context *);
  68 extern void vfs_clean_context(struct fs_context *fc);
  69 extern int finish_clean_context(struct fs_context *fc);
  70
  71 /*
  72  * namei.c
  73  */
  74 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  75                            struct path *path, struct path *root);
  76 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  77                            const char *, unsigned int, struct path *);
  78 long do_rmdir(int dfd, struct filename *name);
  79 long do_unlinkat(int dfd, struct filename *name);
  80 int may_linkat(struct path *link);
  81
  82 /*
  83  * namespace.c
  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_file(struct file *);
  93 extern void __mnt_drop_write_file(struct file *);
  94
  95 extern void dissolve_on_fput(struct vfsmount *);
  96
  97 int path_mount(const char *dev_name, struct path *path,
  98                 const char *type_page, unsigned long flags, void *data_page);
  99 int path_umount(struct path *path, int flags);
 100
 101 /*
 102  * fs_struct.c
 103  */
 104 extern void chroot_fs_refs(const struct path *, const struct path *);
 105
 106 /*
 107  * file_table.c
 108  */
 109 extern struct file *alloc_empty_file(int, const struct cred *);
 110 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 111
 112 /*
 113  * super.c
 114  */
 115 extern int reconfigure_super(struct fs_context *);
 116 extern bool trylock_super(struct super_block *sb);
 117 extern struct super_block *user_get_super(dev_t);
 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
 137 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 138 int chmod_common(const struct path *path, umode_t mode);
 139 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 140                 int flag);
 141 int chown_common(const struct path *path, uid_t user, gid_t group);
 142 extern int vfs_open(const struct path *, struct file *);
 143
 144 /*
 145  * inode.c
 146  */
 147 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 148 extern void inode_add_lru(struct inode *inode);
 149 extern int dentry_needs_remove_privs(struct dentry *dentry);
 150
 151 /*
 152  * fs-writeback.c
 153  */
 154 extern long get_nr_dirty_inodes(void);
 155 extern int invalidate_inodes(struct super_block *, bool);
 156
 157 /*
 158  * dcache.c
 159  */
 160 extern int d_set_mounted(struct dentry *dentry);
 161 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 162 extern struct dentry *d_alloc_cursor(struct dentry *);
 163 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
 164 extern char *simple_dname(struct dentry *, char *, int);
 165 extern void dput_to_list(struct dentry *, struct list_head *);
 166 extern void shrink_dentry_list(struct list_head *);
 167
 168 /*
 169  * read_write.c
 170  */
 171 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 172
 173 /*
 174  * pipe.c
 175  */
 176 extern const struct file_operations pipefifo_fops;
 177
 178 /*
 179  * fs_pin.c
 180  */
 181 extern void group_pin_kill(struct hlist_head *p);
 182 extern void mnt_pin_kill(struct mount *m);
 183
 184 /*
 185  * fs/nsfs.c
 186  */
 187 extern const struct dentry_operations ns_dentry_operations;
 188
 189 /* direct-io.c: */
 190 int sb_init_dio_done_wq(struct super_block *sb);
 191
 192 /*
 193  * fs/stat.c:
 194  */
 195 int do_statx(int dfd, const char __user *filename, unsigned flags,
 196              unsigned int mask, struct statx __user *buffer);