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 19 /* 20 * block_dev.c 21 */ 22 #ifdef CONFIG_BLOCK 23 extern void __init bdev_cache_init(void); 24 25 extern int __sync_blockdev(struct block_device *bdev, int wait); 26 void iterate_bdevs(void (*)(struct block_device *, void *), void *); 27 void emergency_thaw_bdev(struct super_block *sb); 28 void bd_forget(struct inode *inode); 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 static inline void bd_forget(struct inode *inode) 47 { 48 } 49 #endif /* CONFIG_BLOCK */ 50 51 /* 52 * buffer.c 53 */ 54 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, 55 get_block_t *get_block, struct iomap *iomap); 56 57 /* 58 * char_dev.c 59 */ 60 extern void __init chrdev_init(void); 61 62 /* 63 * fs_context.c 64 */ 65 extern const struct fs_context_operations legacy_fs_context_ops; 66 extern int parse_monolithic_mount_data(struct fs_context *, void *); 67 extern void fc_drop_locked(struct fs_context *); 68 extern void vfs_clean_context(struct fs_context *fc); 69 extern int finish_clean_context(struct fs_context *fc); 70 71 /* 72 * namei.c 73 */ 74 extern int filename_lookup(int dfd, struct filename *name, unsigned flags, 75 struct path *path, struct path *root); 76 extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 77 const char *, unsigned int, struct path *); 78 long do_rmdir(int dfd, struct filename *name); 79 long do_unlinkat(int dfd, struct filename *name); 80 int may_linkat(struct path *link); 81 82 /* 83 * namespace.c 84 */ 85 extern void *copy_mount_options(const void __user *); 86 extern char *copy_mount_string(const void __user *); 87 88 extern struct vfsmount *lookup_mnt(const struct path *); 89 extern int finish_automount(struct vfsmount *, struct path *); 90 91 extern int sb_prepare_remount_readonly(struct super_block *); 92 93 extern void __init mnt_init(void); 94 95 extern int __mnt_want_write_file(struct file *); 96 extern void __mnt_drop_write_file(struct file *); 97 98 extern void dissolve_on_fput(struct vfsmount *); 99 100 int path_mount(const char *dev_name, struct path *path, 101 const char *type_page, unsigned long flags, void *data_page); 102 int path_umount(struct path *path, int flags); 103 104 /* 105 * fs_struct.c 106 */ 107 extern void chroot_fs_refs(const struct path *, const struct path *); 108 109 /* 110 * file_table.c 111 */ 112 extern struct file *alloc_empty_file(int, const struct cred *); 113 extern struct file *alloc_empty_file_noaccount(int, const struct cred *); 114 115 /* 116 * super.c 117 */ 118 extern int reconfigure_super(struct fs_context *); 119 extern bool trylock_super(struct super_block *sb); 120 extern struct super_block *user_get_super(dev_t); 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(struct dentry *, struct vfsmount *, 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); 139 140 long do_sys_ftruncate(unsigned int fd, loff_t length, int small); 141 int chmod_common(const struct path *path, umode_t mode); 142 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group, 143 int flag); 144 int chown_common(const struct path *path, uid_t user, gid_t group); 145 extern int vfs_open(const struct path *, struct file *); 146 147 /* 148 * inode.c 149 */ 150 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc); 151 extern void inode_add_lru(struct inode *inode); 152 extern int dentry_needs_remove_privs(struct dentry *dentry); 153 154 /* 155 * fs-writeback.c 156 */ 157 extern long get_nr_dirty_inodes(void); 158 extern int invalidate_inodes(struct super_block *, bool); 159 160 /* 161 * dcache.c 162 */ 163 extern int d_set_mounted(struct dentry *dentry); 164 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc); 165 extern struct dentry *d_alloc_cursor(struct dentry *); 166 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *); 167 extern char *simple_dname(struct dentry *, char *, int); 168 extern void dput_to_list(struct dentry *, struct list_head *); 169 extern void shrink_dentry_list(struct list_head *); 170 171 /* 172 * read_write.c 173 */ 174 extern int rw_verify_area(int, struct file *, const loff_t *, size_t); 175 176 /* 177 * pipe.c 178 */ 179 extern const struct file_operations pipefifo_fops; 180 181 /* 182 * fs_pin.c 183 */ 184 extern void group_pin_kill(struct hlist_head *p); 185 extern void mnt_pin_kill(struct mount *m); 186 187 /* 188 * fs/nsfs.c 189 */ 190 extern const struct dentry_operations ns_dentry_operations; 191 192 /* direct-io.c: */ 193 int sb_init_dio_done_wq(struct super_block *sb); 194 195 /* 196 * fs/stat.c: 197 */ 198 int do_statx(int dfd, const char __user *filename, unsigned flags, 199 unsigned int mask, struct statx __user *buffer); 200