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 #else 29 static inline void bdev_cache_init(void) 30 { 31 } 32 33 static inline int __sync_blockdev(struct block_device *bdev, int wait) 34 { 35 return 0; 36 } 37 static inline void iterate_bdevs(void (*f)(struct block_device *, void *), 38 void *arg) 39 { 40 } 41 static inline int emergency_thaw_bdev(struct super_block *sb) 42 { 43 return 0; 44 } 45 #endif /* CONFIG_BLOCK */ 46 47 /* 48 * buffer.c 49 */ 50 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, 51 get_block_t *get_block, struct iomap *iomap); 52 53 /* 54 * char_dev.c 55 */ 56 extern void __init chrdev_init(void); 57 58 /* 59 * fs_context.c 60 */ 61 extern const struct fs_context_operations legacy_fs_context_ops; 62 extern int parse_monolithic_mount_data(struct fs_context *, void *); 63 extern void fc_drop_locked(struct fs_context *); 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 long do_rmdir(int dfd, struct filename *name); 75 long do_unlinkat(int dfd, struct filename *name); 76 int may_linkat(struct path *link); 77 int do_renameat2(int olddfd, struct filename *oldname, int newdfd, 78 struct filename *newname, unsigned int flags); 79 80 /* 81 * namespace.c 82 */ 83 extern struct vfsmount *lookup_mnt(const struct path *); 84 extern int finish_automount(struct vfsmount *, struct path *); 85 86 extern int sb_prepare_remount_readonly(struct super_block *); 87 88 extern void __init mnt_init(void); 89 90 extern int __mnt_want_write_file(struct file *); 91 extern void __mnt_drop_write_file(struct file *); 92 93 extern void dissolve_on_fput(struct vfsmount *); 94 95 int path_mount(const char *dev_name, struct path *path, 96 const char *type_page, unsigned long flags, void *data_page); 97 int path_umount(struct path *path, int flags); 98 99 /* 100 * fs_struct.c 101 */ 102 extern void chroot_fs_refs(const struct path *, const struct path *); 103 104 /* 105 * file_table.c 106 */ 107 extern struct file *alloc_empty_file(int, const struct cred *); 108 extern struct file *alloc_empty_file_noaccount(int, const struct cred *); 109 110 /* 111 * super.c 112 */ 113 extern int reconfigure_super(struct fs_context *); 114 extern bool trylock_super(struct super_block *sb); 115 struct super_block *user_get_super(dev_t, bool excl); 116 void put_super(struct super_block *sb); 117 extern bool mount_capable(struct fs_context *); 118 119 /* 120 * open.c 121 */ 122 struct open_flags { 123 int open_flag; 124 umode_t mode; 125 int acc_mode; 126 int intent; 127 int lookup_flags; 128 }; 129 extern struct file *do_filp_open(int dfd, struct filename *pathname, 130 const struct open_flags *op); 131 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *, 132 const char *, const struct open_flags *); 133 extern struct open_how build_open_how(int flags, umode_t mode); 134 extern int build_open_flags(const struct open_how *how, struct open_flags *op); 135 136 long do_sys_ftruncate(unsigned int fd, loff_t length, int small); 137 int chmod_common(const struct path *path, umode_t mode); 138 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group, 139 int flag); 140 int chown_common(const struct path *path, uid_t user, gid_t group); 141 extern int vfs_open(const struct path *, struct file *); 142 143 /* 144 * inode.c 145 */ 146 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc); 147 extern void inode_add_lru(struct inode *inode); 148 extern int dentry_needs_remove_privs(struct dentry *dentry); 149 150 /* 151 * fs-writeback.c 152 */ 153 extern long get_nr_dirty_inodes(void); 154 extern int invalidate_inodes(struct super_block *, bool); 155 156 /* 157 * dcache.c 158 */ 159 extern int d_set_mounted(struct dentry *dentry); 160 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc); 161 extern struct dentry *d_alloc_cursor(struct dentry *); 162 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *); 163 extern char *simple_dname(struct dentry *, char *, int); 164 extern void dput_to_list(struct dentry *, struct list_head *); 165 extern void shrink_dentry_list(struct list_head *); 166 167 /* 168 * read_write.c 169 */ 170 extern int rw_verify_area(int, struct file *, const loff_t *, size_t); 171 172 /* 173 * pipe.c 174 */ 175 extern const struct file_operations pipefifo_fops; 176 177 /* 178 * fs_pin.c 179 */ 180 extern void group_pin_kill(struct hlist_head *p); 181 extern void mnt_pin_kill(struct mount *m); 182 183 /* 184 * fs/nsfs.c 185 */ 186 extern const struct dentry_operations ns_dentry_operations; 187 188 /* direct-io.c: */ 189 int sb_init_dio_done_wq(struct super_block *sb); 190 191 /* 192 * fs/stat.c: 193 */ 194 int do_statx(int dfd, const char __user *filename, unsigned flags, 195 unsigned int mask, struct statx __user *buffer); 196