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 pipe_inode_info; 18 struct iov_iter; 19 struct mnt_idmap; 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 int do_rmdir(int dfd, struct filename *name); 63 int do_unlinkat(int dfd, struct filename *name); 64 int may_linkat(struct mnt_idmap *idmap, const struct path *link); 65 int do_renameat2(int olddfd, struct filename *oldname, int newdfd, 66 struct filename *newname, unsigned int flags); 67 int do_mkdirat(int dfd, struct filename *name, umode_t mode); 68 int do_symlinkat(struct filename *from, int newdfd, struct filename *to); 69 int do_linkat(int olddfd, struct filename *old, int newdfd, 70 struct filename *new, int flags); 71 72 /* 73 * namespace.c 74 */ 75 extern struct vfsmount *lookup_mnt(const struct path *); 76 extern int finish_automount(struct vfsmount *, const struct path *); 77 78 extern int sb_prepare_remount_readonly(struct super_block *); 79 80 extern void __init mnt_init(void); 81 82 extern int __mnt_want_write_file(struct file *); 83 extern void __mnt_drop_write_file(struct file *); 84 85 extern void dissolve_on_fput(struct vfsmount *); 86 extern bool may_mount(void); 87 88 int path_mount(const char *dev_name, struct path *path, 89 const char *type_page, unsigned long flags, void *data_page); 90 int path_umount(struct path *path, int flags); 91 92 /* 93 * fs_struct.c 94 */ 95 extern void chroot_fs_refs(const struct path *, const struct path *); 96 97 /* 98 * file_table.c 99 */ 100 extern struct file *alloc_empty_file(int, const struct cred *); 101 extern struct file *alloc_empty_file_noaccount(int, const struct cred *); 102 103 static inline void put_file_access(struct file *file) 104 { 105 if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) { 106 i_readcount_dec(file->f_inode); 107 } else if (file->f_mode & FMODE_WRITER) { 108 put_write_access(file->f_inode); 109 __mnt_drop_write(file->f_path.mnt); 110 } 111 } 112 113 /* 114 * super.c 115 */ 116 extern int reconfigure_super(struct fs_context *); 117 extern bool trylock_super(struct super_block *sb); 118 struct super_block *user_get_super(dev_t, bool excl); 119 void put_super(struct super_block *sb); 120 extern bool mount_capable(struct fs_context *); 121 int sb_init_dio_done_wq(struct super_block *sb); 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 struct file *__close_fd_get_file(unsigned int fd); 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 int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry); 153 bool in_group_or_capable(struct mnt_idmap *idmap, 154 const struct inode *inode, vfsgid_t vfsgid); 155 156 /* 157 * fs-writeback.c 158 */ 159 extern long get_nr_dirty_inodes(void); 160 extern int invalidate_inodes(struct super_block *, bool); 161 162 /* 163 * dcache.c 164 */ 165 extern int d_set_mounted(struct dentry *dentry); 166 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc); 167 extern struct dentry *d_alloc_cursor(struct dentry *); 168 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *); 169 extern char *simple_dname(struct dentry *, char *, int); 170 extern void dput_to_list(struct dentry *, struct list_head *); 171 extern void shrink_dentry_list(struct list_head *); 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 /* 190 * fs/stat.c: 191 */ 192 193 int getname_statx_lookup_flags(int flags); 194 int do_statx(int dfd, struct filename *filename, unsigned int flags, 195 unsigned int mask, struct statx __user *buffer); 196 197 /* 198 * fs/splice.c: 199 */ 200 long splice_file_to_pipe(struct file *in, 201 struct pipe_inode_info *opipe, 202 loff_t *offset, 203 size_t len, unsigned int flags); 204 205 /* 206 * fs/xattr.c: 207 */ 208 struct xattr_name { 209 char name[XATTR_NAME_MAX + 1]; 210 }; 211 212 struct xattr_ctx { 213 /* Value of attribute */ 214 union { 215 const void __user *cvalue; 216 void __user *value; 217 }; 218 void *kvalue; 219 size_t size; 220 /* Attribute name */ 221 struct xattr_name *kname; 222 unsigned int flags; 223 }; 224 225 226 ssize_t do_getxattr(struct mnt_idmap *idmap, 227 struct dentry *d, 228 struct xattr_ctx *ctx); 229 230 int setxattr_copy(const char __user *name, struct xattr_ctx *ctx); 231 int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry, 232 struct xattr_ctx *ctx); 233 int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode); 234 235 #ifdef CONFIG_FS_POSIX_ACL 236 int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry, 237 const char *acl_name, const void *kvalue, size_t size); 238 ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry, 239 const char *acl_name, void *kvalue, size_t size); 240 #else 241 static inline int do_set_acl(struct mnt_idmap *idmap, 242 struct dentry *dentry, const char *acl_name, 243 const void *kvalue, size_t size) 244 { 245 return -EOPNOTSUPP; 246 } 247 static inline ssize_t do_get_acl(struct mnt_idmap *idmap, 248 struct dentry *dentry, const char *acl_name, 249 void *kvalue, size_t size) 250 { 251 return -EOPNOTSUPP; 252 } 253 #endif 254 255 ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos); 256 257 /* 258 * fs/attr.c 259 */ 260 struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns); 261 struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap); 262 void mnt_idmap_put(struct mnt_idmap *idmap); 263