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