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/bdev.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 int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
  52                 get_block_t *get_block, const 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 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 int do_rmdir(int dfd, struct filename *name);
  75 int do_unlinkat(int dfd, struct filename *name);
  76 int may_linkat(struct user_namespace *mnt_userns, struct path *link);
  77 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
  78                  struct filename *newname, unsigned int flags);
  79 int do_mkdirat(int dfd, struct filename *name, umode_t mode);
  80 int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
  81 int do_linkat(int olddfd, struct filename *old, int newdfd,
  82                         struct filename *new, int flags);
  83
  84 /*
  85  * namespace.c
  86  */
  87 extern struct vfsmount *lookup_mnt(const struct path *);
  88 extern int finish_automount(struct vfsmount *, struct path *);
  89
  90 extern int sb_prepare_remount_readonly(struct super_block *);
  91
  92 extern void __init mnt_init(void);
  93
  94 extern int __mnt_want_write_file(struct file *);
  95 extern void __mnt_drop_write_file(struct file *);
  96
  97 extern void dissolve_on_fput(struct vfsmount *);
  98
  99 int path_mount(const char *dev_name, struct path *path,
 100                 const char *type_page, unsigned long flags, void *data_page);
 101 int path_umount(struct path *path, int flags);
 102
 103 /*
 104  * fs_struct.c
 105  */
 106 extern void chroot_fs_refs(const struct path *, const struct path *);
 107
 108 /*
 109  * file_table.c
 110  */
 111 extern struct file *alloc_empty_file(int, const struct cred *);
 112 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 113
 114 /*
 115  * super.c
 116  */
 117 extern int reconfigure_super(struct fs_context *);
 118 extern bool trylock_super(struct super_block *sb);
 119 struct super_block *user_get_super(dev_t, bool excl);
 120 void put_super(struct super_block *sb);
 121 extern bool mount_capable(struct fs_context *);
 122
 123 /*
 124  * open.c
 125  */
 126 struct open_flags {
 127         int open_flag;
 128         umode_t mode;
 129         int acc_mode;
 130         int intent;
 131         int lookup_flags;
 132 };
 133 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 134                 const struct open_flags *op);
 135 extern struct file *do_file_open_root(const struct path *,
 136                 const char *, const struct open_flags *);
 137 extern struct open_how build_open_how(int flags, umode_t mode);
 138 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
 139 extern int __close_fd_get_file(unsigned int fd, struct file **res);
 140
 141 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 142 int chmod_common(const struct path *path, umode_t mode);
 143 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 144                 int flag);
 145 int chown_common(const struct path *path, uid_t user, gid_t group);
 146 extern int vfs_open(const struct path *, struct file *);
 147
 148 /*
 149  * inode.c
 150  */
 151 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 152 extern void inode_add_lru(struct inode *inode);
 153 extern int dentry_needs_remove_privs(struct dentry *dentry);
 154
 155 /*
 156  * fs-writeback.c
 157  */
 158 extern long get_nr_dirty_inodes(void);
 159 extern int invalidate_inodes(struct super_block *, bool);
 160
 161 /*
 162  * dcache.c
 163  */
 164 extern int d_set_mounted(struct dentry *dentry);
 165 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 166 extern struct dentry *d_alloc_cursor(struct dentry *);
 167 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
 168 extern char *simple_dname(struct dentry *, char *, int);
 169 extern void dput_to_list(struct dentry *, struct list_head *);
 170 extern void shrink_dentry_list(struct list_head *);
 171
 172 /*
 173  * read_write.c
 174  */
 175 extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
 176
 177 /*
 178  * pipe.c
 179  */
 180 extern const struct file_operations pipefifo_fops;
 181
 182 /*
 183  * fs_pin.c
 184  */
 185 extern void group_pin_kill(struct hlist_head *p);
 186 extern void mnt_pin_kill(struct mount *m);
 187
 188 /*
 189  * fs/nsfs.c
 190  */
 191 extern const struct dentry_operations ns_dentry_operations;
 192
 193 /* direct-io.c: */
 194 int sb_init_dio_done_wq(struct super_block *sb);
 195
 196 /*
 197  * fs/stat.c:
 198  */
 199 int do_statx(int dfd, const char __user *filename, unsigned flags,
 200              unsigned int mask, struct statx __user *buffer);
 201
 202 /*
 203  * fs/splice.c:
 204  */
 205 long splice_file_to_pipe(struct file *in,
 206                          struct pipe_inode_info *opipe,
 207                          loff_t *offset,
 208                          size_t len, unsigned int flags);