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); 266