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); 209