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 struct iov_iter;
  20
  21 /*
  22  * block/bdev.c
  23  */
  24 #ifdef CONFIG_BLOCK
  25 extern void __init bdev_cache_init(void);
  26
  27 void emergency_thaw_bdev(struct super_block *sb);
  28 #else
  29 static inline void bdev_cache_init(void)
  30 {
  31 }
  32 static inline int emergency_thaw_bdev(struct super_block *sb)
  33 {
  34         return 0;
  35 }
  36 #endif /* CONFIG_BLOCK */
  37
  38 /*
  39  * buffer.c
  40  */
  41 int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
  42                 get_block_t *get_block, const 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 vfs_clean_context(struct fs_context *fc);
  55 extern int finish_clean_context(struct fs_context *fc);
  56
  57 /*
  58  * namei.c
  59  */
  60 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
  61                            struct path *path, struct path *root);
  62 extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
  63                            const char *, unsigned int, struct path *);
  64 int do_rmdir(int dfd, struct filename *name);
  65 int do_unlinkat(int dfd, struct filename *name);
  66 int may_linkat(struct user_namespace *mnt_userns, const struct path *link);
  67 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
  68                  struct filename *newname, unsigned int flags);
  69 int do_mkdirat(int dfd, struct filename *name, umode_t mode);
  70 int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
  71 int do_linkat(int olddfd, struct filename *old, int newdfd,
  72                         struct filename *new, int flags);
  73
  74 /*
  75  * namespace.c
  76  */
  77 extern struct vfsmount *lookup_mnt(const struct path *);
  78 extern int finish_automount(struct vfsmount *, const struct path *);
  79
  80 extern int sb_prepare_remount_readonly(struct super_block *);
  81
  82 extern void __init mnt_init(void);
  83
  84 extern int __mnt_want_write_file(struct file *);
  85 extern void __mnt_drop_write_file(struct file *);
  86
  87 extern void dissolve_on_fput(struct vfsmount *);
  88 extern bool may_mount(void);
  89
  90 int path_mount(const char *dev_name, struct path *path,
  91                 const char *type_page, unsigned long flags, void *data_page);
  92 int path_umount(struct path *path, int flags);
  93
  94 /*
  95  * fs_struct.c
  96  */
  97 extern void chroot_fs_refs(const struct path *, const struct path *);
  98
  99 /*
 100  * file_table.c
 101  */
 102 extern struct file *alloc_empty_file(int, const struct cred *);
 103 extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
 104
 105 static inline void put_file_access(struct file *file)
 106 {
 107         if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
 108                 i_readcount_dec(file->f_inode);
 109         } else if (file->f_mode & FMODE_WRITER) {
 110                 put_write_access(file->f_inode);
 111                 __mnt_drop_write(file->f_path.mnt);
 112         }
 113 }
 114
 115 /*
 116  * super.c
 117  */
 118 extern int reconfigure_super(struct fs_context *);
 119 extern bool trylock_super(struct super_block *sb);
 120 struct super_block *user_get_super(dev_t, bool excl);
 121 void put_super(struct super_block *sb);
 122 extern bool mount_capable(struct fs_context *);
 123
 124 /*
 125  * open.c
 126  */
 127 struct open_flags {
 128         int open_flag;
 129         umode_t mode;
 130         int acc_mode;
 131         int intent;
 132         int lookup_flags;
 133 };
 134 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 135                 const struct open_flags *op);
 136 extern struct file *do_file_open_root(const struct path *,
 137                 const char *, const struct open_flags *);
 138 extern struct open_how build_open_how(int flags, umode_t mode);
 139 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
 140 extern struct file *__close_fd_get_file(unsigned int fd);
 141
 142 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
 143 int chmod_common(const struct path *path, umode_t mode);
 144 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
 145                 int flag);
 146 int chown_common(const struct path *path, uid_t user, gid_t group);
 147 extern int vfs_open(const struct path *, struct file *);
 148
 149 /*
 150  * inode.c
 151  */
 152 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
 153 int dentry_needs_remove_privs(struct user_namespace *, struct dentry *dentry);
 154 bool in_group_or_capable(struct user_namespace *mnt_userns,
 155                          const struct inode *inode, vfsgid_t vfsgid);
 156
 157 /*
 158  * fs-writeback.c
 159  */
 160 extern long get_nr_dirty_inodes(void);
 161 extern int invalidate_inodes(struct super_block *, bool);
 162
 163 /*
 164  * dcache.c
 165  */
 166 extern int d_set_mounted(struct dentry *dentry);
 167 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
 168 extern struct dentry *d_alloc_cursor(struct dentry *);
 169 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
 170 extern char *simple_dname(struct dentry *, char *, int);
 171 extern void dput_to_list(struct dentry *, struct list_head *);
 172 extern void shrink_dentry_list(struct list_head *);
 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
 197 int getname_statx_lookup_flags(int flags);
 198 int do_statx(int dfd, struct filename *filename, unsigned int flags,
 199              unsigned int mask, struct statx __user *buffer);
 200
 201 /*
 202  * fs/splice.c:
 203  */
 204 long splice_file_to_pipe(struct file *in,
 205                          struct pipe_inode_info *opipe,
 206                          loff_t *offset,
 207                          size_t len, unsigned int flags);
 208
 209 /*
 210  * fs/xattr.c:
 211  */
 212 struct xattr_name {
 213         char name[XATTR_NAME_MAX + 1];
 214 };
 215
 216 struct xattr_ctx {
 217         /* Value of attribute */
 218         union {
 219                 const void __user *cvalue;
 220                 void __user *value;
 221         };
 222         void *kvalue;
 223         size_t size;
 224         /* Attribute name */
 225         struct xattr_name *kname;
 226         unsigned int flags;
 227 };
 228
 229
 230 ssize_t do_getxattr(struct mnt_idmap *idmap,
 231                     struct dentry *d,
 232                     struct xattr_ctx *ctx);
 233
 234 int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
 235 int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
 236                 struct xattr_ctx *ctx);
 237 int may_write_xattr(struct user_namespace *mnt_userns, struct inode *inode);
 238
 239 #ifdef CONFIG_FS_POSIX_ACL
 240 int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 241                const char *acl_name, const void *kvalue, size_t size);
 242 ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 243                    const char *acl_name, void *kvalue, size_t size);
 244 #else
 245 static inline int do_set_acl(struct mnt_idmap *idmap,
 246                              struct dentry *dentry, const char *acl_name,
 247                              const void *kvalue, size_t size)
 248 {
 249         return -EOPNOTSUPP;
 250 }
 251 static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
 252                                  struct dentry *dentry, const char *acl_name,
 253                                  void *kvalue, size_t size)
 254 {
 255         return -EOPNOTSUPP;
 256 }
 257 #endif
 258
 259 ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
 260
 261 /*
 262  * fs/attr.c
 263  */
 264 int setattr_should_drop_sgid(struct user_namespace *mnt_userns,
 265                              const struct inode *inode);