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_dev.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 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, 52 get_block_t *get_block, 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 fc_drop_locked(struct fs_context *); 65 extern void vfs_clean_context(struct fs_context *fc); 66 extern int finish_clean_context(struct fs_context *fc); 67 68 /* 69 * namei.c 70 */ 71 extern int filename_lookup(int dfd, struct filename *name, unsigned flags, 72 struct path *path, struct path *root); 73 extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 74 const char *, unsigned int, struct path *); 75 long do_rmdir(int dfd, struct filename *name); 76 long do_unlinkat(int dfd, struct filename *name); 77 int may_linkat(struct user_namespace *mnt_userns, struct path *link); 78 int do_renameat2(int olddfd, struct filename *oldname, int newdfd, 79 struct filename *newname, unsigned int flags); 80 81 /* 82 * namespace.c 83 */ 84 extern struct vfsmount *lookup_mnt(const struct path *); 85 extern int finish_automount(struct vfsmount *, struct path *); 86 87 extern int sb_prepare_remount_readonly(struct super_block *); 88 89 extern void __init mnt_init(void); 90 91 extern int __mnt_want_write_file(struct file *); 92 extern void __mnt_drop_write_file(struct file *); 93 94 extern void dissolve_on_fput(struct vfsmount *); 95 96 int path_mount(const char *dev_name, struct path *path, 97 const char *type_page, unsigned long flags, void *data_page); 98 int path_umount(struct path *path, int flags); 99 100 /* 101 * fs_struct.c 102 */ 103 extern void chroot_fs_refs(const struct path *, const struct path *); 104 105 /* 106 * file_table.c 107 */ 108 extern struct file *alloc_empty_file(int, const struct cred *); 109 extern struct file *alloc_empty_file_noaccount(int, const struct cred *); 110 111 /* 112 * super.c 113 */ 114 extern int reconfigure_super(struct fs_context *); 115 extern bool trylock_super(struct super_block *sb); 116 struct super_block *user_get_super(dev_t, bool excl); 117 void put_super(struct super_block *sb); 118 extern bool mount_capable(struct fs_context *); 119 120 /* 121 * open.c 122 */ 123 struct open_flags { 124 int open_flag; 125 umode_t mode; 126 int acc_mode; 127 int intent; 128 int lookup_flags; 129 }; 130 extern struct file *do_filp_open(int dfd, struct filename *pathname, 131 const struct open_flags *op); 132 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *, 133 const char *, const struct open_flags *); 134 extern struct open_how build_open_how(int flags, umode_t mode); 135 extern int build_open_flags(const struct open_how *how, struct open_flags *op); 136 extern int __close_fd_get_file(unsigned int fd, struct file **res); 137 138 long do_sys_ftruncate(unsigned int fd, loff_t length, int small); 139 int chmod_common(const struct path *path, umode_t mode); 140 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group, 141 int flag); 142 int chown_common(const struct path *path, uid_t user, gid_t group); 143 extern int vfs_open(const struct path *, struct file *); 144 145 /* 146 * inode.c 147 */ 148 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc); 149 extern void inode_add_lru(struct inode *inode); 150 extern int dentry_needs_remove_privs(struct dentry *dentry); 151 152 /* 153 * fs-writeback.c 154 */ 155 extern long get_nr_dirty_inodes(void); 156 extern int invalidate_inodes(struct super_block *, bool); 157 158 /* 159 * dcache.c 160 */ 161 extern int d_set_mounted(struct dentry *dentry); 162 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc); 163 extern struct dentry *d_alloc_cursor(struct dentry *); 164 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *); 165 extern char *simple_dname(struct dentry *, char *, int); 166 extern void dput_to_list(struct dentry *, struct list_head *); 167 extern void shrink_dentry_list(struct list_head *); 168 169 /* 170 * read_write.c 171 */ 172 extern int rw_verify_area(int, struct file *, const loff_t *, size_t); 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 int do_statx(int dfd, const char __user *filename, unsigned flags, 197 unsigned int mask, struct statx __user *buffer); 198 199 /* 200 * fs/splice.c: 201 */ 202 long splice_file_to_pipe(struct file *in, 203 struct pipe_inode_info *opipe, 204 loff_t *offset, 205 size_t len, unsigned int flags); 206