| 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); |