1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* fs/ internal definitions
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
9 struct file_system_type;
15 struct shrink_control;
17 struct pipe_inode_info;
25 extern void __init bdev_cache_init(void);
27 static inline void bdev_cache_init(void)
30 #endif /* CONFIG_BLOCK */
35 int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
36 get_block_t *get_block, const struct iomap *iomap);
41 extern void __init chrdev_init(void);
46 extern const struct fs_context_operations legacy_fs_context_ops;
47 extern int parse_monolithic_mount_data(struct fs_context *, void *);
48 extern void vfs_clean_context(struct fs_context *fc);
49 extern int finish_clean_context(struct fs_context *fc);
54 extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
55 struct path *path, struct path *root);
56 int do_rmdir(int dfd, struct filename *name);
57 int do_unlinkat(int dfd, struct filename *name);
58 int may_linkat(struct mnt_idmap *idmap, const struct path *link);
59 int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
60 struct filename *newname, unsigned int flags);
61 int do_mkdirat(int dfd, struct filename *name, umode_t mode);
62 int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
63 int do_linkat(int olddfd, struct filename *old, int newdfd,
64 struct filename *new, int flags);
69 extern struct vfsmount *lookup_mnt(const struct path *);
70 extern int finish_automount(struct vfsmount *, const struct path *);
72 extern int sb_prepare_remount_readonly(struct super_block *);
74 extern void __init mnt_init(void);
76 int mnt_get_write_access_file(struct file *file);
77 void mnt_put_write_access_file(struct file *file);
79 extern void dissolve_on_fput(struct vfsmount *);
80 extern bool may_mount(void);
82 int path_mount(const char *dev_name, struct path *path,
83 const char *type_page, unsigned long flags, void *data_page);
84 int path_umount(struct path *path, int flags);
89 extern void chroot_fs_refs(const struct path *, const struct path *);
94 struct file *alloc_empty_file(int flags, const struct cred *cred);
95 struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred);
96 struct file *alloc_empty_backing_file(int flags, const struct cred *cred);
97 void release_empty_file(struct file *f);
99 static inline void file_put_write_access(struct file *file)
101 put_write_access(file->f_inode);
102 mnt_put_write_access(file->f_path.mnt);
103 if (unlikely(file->f_mode & FMODE_BACKING))
104 mnt_put_write_access(backing_file_user_path(file)->mnt);
107 static inline void put_file_access(struct file *file)
109 if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
110 i_readcount_dec(file->f_inode);
111 } else if (file->f_mode & FMODE_WRITER) {
112 file_put_write_access(file);
119 extern int reconfigure_super(struct fs_context *);
120 extern bool super_trylock_shared(struct super_block *sb);
121 struct super_block *user_get_super(dev_t, bool excl);
122 void put_super(struct super_block *sb);
123 extern bool mount_capable(struct fs_context *);
124 int sb_init_dio_done_wq(struct super_block *sb);
127 * Prepare superblock for changing its read-only state (i.e., either remount
128 * read-write superblock read-only or vice versa). After this function returns
129 * mnt_is_readonly() will return true for any mount of the superblock if its
130 * caller is able to observe any changes done by the remount. This holds until
131 * sb_end_ro_state_change() is called.
133 static inline void sb_start_ro_state_change(struct super_block *sb)
135 WRITE_ONCE(sb->s_readonly_remount, 1);
137 * For RO->RW transition, the barrier pairs with the barrier in
138 * mnt_is_readonly() making sure if mnt_is_readonly() sees SB_RDONLY
139 * cleared, it will see s_readonly_remount set.
140 * For RW->RO transition, the barrier pairs with the barrier in
141 * mnt_get_write_access() before the mnt_is_readonly() check.
142 * The barrier makes sure if mnt_get_write_access() sees MNT_WRITE_HOLD
143 * already cleared, it will see s_readonly_remount set.
149 * Ends section changing read-only state of the superblock. After this function
150 * returns if mnt_is_readonly() returns false, the caller will be able to
151 * observe all the changes remount did to the superblock.
153 static inline void sb_end_ro_state_change(struct super_block *sb)
156 * This barrier provides release semantics that pairs with
157 * the smp_rmb() acquire semantics in mnt_is_readonly().
158 * This barrier pair ensure that when mnt_is_readonly() sees
159 * 0 for sb->s_readonly_remount, it will also see all the
160 * preceding flag changes that were made during the RO state
164 WRITE_ONCE(sb->s_readonly_remount, 0);
177 extern struct file *do_filp_open(int dfd, struct filename *pathname,
178 const struct open_flags *op);
179 extern struct file *do_file_open_root(const struct path *,
180 const char *, const struct open_flags *);
181 extern struct open_how build_open_how(int flags, umode_t mode);
182 extern int build_open_flags(const struct open_how *how, struct open_flags *op);
183 extern struct file *__close_fd_get_file(unsigned int fd);
185 long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
186 int chmod_common(const struct path *path, umode_t mode);
187 int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
189 int chown_common(const struct path *path, uid_t user, gid_t group);
190 extern int vfs_open(const struct path *, struct file *);
195 extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
196 int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry);
197 bool in_group_or_capable(struct mnt_idmap *idmap,
198 const struct inode *inode, vfsgid_t vfsgid);
199 void lock_two_inodes(struct inode *inode1, struct inode *inode2,
200 unsigned subclass1, unsigned subclass2);
205 extern long get_nr_dirty_inodes(void);
206 void invalidate_inodes(struct super_block *sb);
211 extern int d_set_mounted(struct dentry *dentry);
212 extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
213 extern struct dentry *d_alloc_cursor(struct dentry *);
214 extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
215 extern char *simple_dname(struct dentry *, char *, int);
216 extern void dput_to_list(struct dentry *, struct list_head *);
217 extern void shrink_dentry_list(struct list_head *);
222 extern const struct file_operations pipefifo_fops;
227 extern void group_pin_kill(struct hlist_head *p);
228 extern void mnt_pin_kill(struct mount *m);
233 extern const struct dentry_operations ns_dentry_operations;
239 int getname_statx_lookup_flags(int flags);
240 int do_statx(int dfd, struct filename *filename, unsigned int flags,
241 unsigned int mask, struct statx __user *buffer);
246 long splice_file_to_pipe(struct file *in,
247 struct pipe_inode_info *opipe,
249 size_t len, unsigned int flags);
255 char name[XATTR_NAME_MAX + 1];
259 /* Value of attribute */
261 const void __user *cvalue;
267 struct xattr_name *kname;
272 ssize_t do_getxattr(struct mnt_idmap *idmap,
274 struct xattr_ctx *ctx);
276 int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
277 int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
278 struct xattr_ctx *ctx);
279 int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);
281 #ifdef CONFIG_FS_POSIX_ACL
282 int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
283 const char *acl_name, const void *kvalue, size_t size);
284 ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
285 const char *acl_name, void *kvalue, size_t size);
287 static inline int do_set_acl(struct mnt_idmap *idmap,
288 struct dentry *dentry, const char *acl_name,
289 const void *kvalue, size_t size)
293 static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
294 struct dentry *dentry, const char *acl_name,
295 void *kvalue, size_t size)
301 ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
306 struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns);
307 struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
308 void mnt_idmap_put(struct mnt_idmap *idmap);