blk-cgroup: fix rcu lockdep warning in blkg_lookup()
[linux-block.git] / fs / internal.h
CommitLineData
2874c5fd 1/* SPDX-License-Identifier: GPL-2.0-or-later */
07f3f05c
DH
2/* fs/ internal definitions
3 *
4 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
07f3f05c
DH
6 */
7
5e6d12b2 8struct super_block;
9d412a43 9struct file_system_type;
ae259a9c 10struct iomap;
befb503c 11struct iomap_ops;
a6f76f23 12struct linux_binprm;
3e93cd67 13struct path;
c7105365 14struct mount;
503c358c 15struct shrink_control;
9bc61ab1 16struct fs_context;
b964bf53 17struct pipe_inode_info;
06bbaa6d 18struct iov_iter;
3707d84c 19struct mnt_idmap;
5e6d12b2 20
07f3f05c 21/*
0dca4462 22 * block/bdev.c
07f3f05c 23 */
9361401e 24#ifdef CONFIG_BLOCK
07f3f05c 25extern void __init bdev_cache_init(void);
9361401e 26#else
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AM
27static inline void bdev_cache_init(void)
28{
29}
3f1266f1 30#endif /* CONFIG_BLOCK */
7b0de42d 31
4db96b71
AM
32/*
33 * buffer.c
34 */
d1bd0b4e 35int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
6d49cc85 36 get_block_t *get_block, const struct iomap *iomap);
4db96b71 37
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DH
38/*
39 * char_dev.c
40 */
41extern void __init chrdev_init(void);
42
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DH
43/*
44 * fs_context.c
45 */
ecdab150 46extern const struct fs_context_operations legacy_fs_context_ops;
9bc61ab1 47extern int parse_monolithic_mount_data(struct fs_context *, void *);
ecdab150
DH
48extern void vfs_clean_context(struct fs_context *fc);
49extern int finish_clean_context(struct fs_context *fc);
9bc61ab1 50
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51/*
52 * namei.c
53 */
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DH
54extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
55 struct path *path, struct path *root);
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DK
56int do_rmdir(int dfd, struct filename *name);
57int do_unlinkat(int dfd, struct filename *name);
4609e1f1 58int may_linkat(struct mnt_idmap *idmap, const struct path *link);
e886663c
JA
59int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
60 struct filename *newname, unsigned int flags);
45f30dab 61int do_mkdirat(int dfd, struct filename *name, umode_t mode);
7a8721f8 62int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
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63int do_linkat(int olddfd, struct filename *old, int newdfd,
64 struct filename *new, int flags);
0bdaea90 65
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DH
66/*
67 * namespace.c
68 */
ca71cf71 69extern struct vfsmount *lookup_mnt(const struct path *);
1e2d8464 70extern int finish_automount(struct vfsmount *, const struct path *);
6d59e7f5 71
4ed5e82f 72extern int sb_prepare_remount_readonly(struct super_block *);
f03c6599 73
6d59e7f5 74extern void __init mnt_init(void);
3e93cd67 75
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AG
76int mnt_get_write_access_file(struct file *file);
77void mnt_put_write_access_file(struct file *file);
47cd813f 78
a07b2000 79extern void dissolve_on_fput(struct vfsmount *);
a5f85d78 80extern bool may_mount(void);
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CH
81
82int path_mount(const char *dev_name, struct path *path,
83 const char *type_page, unsigned long flags, void *data_page);
09267def 84int path_umount(struct path *path, int flags);
c60166f0 85
3e93cd67
AV
86/*
87 * fs_struct.c
88 */
dcf787f3 89extern void chroot_fs_refs(const struct path *, const struct path *);
864d7c4c 90
91/*
92 * file_table.c
93 */
62d53c4a
AG
94struct file *alloc_empty_file(int flags, const struct cred *cred);
95struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred);
96struct file *alloc_empty_backing_file(int flags, const struct cred *cred);
93faf426 97void release_empty_file(struct file *f);
62c6943b 98
83bc1d29
AG
99static inline void file_put_write_access(struct file *file)
100{
101 put_write_access(file->f_inode);
102 mnt_put_write_access(file->f_path.mnt);
103 if (unlikely(file->f_mode & FMODE_BACKING))
def3ae83 104 mnt_put_write_access(backing_file_user_path(file)->mnt);
83bc1d29
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105}
106
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107static inline void put_file_access(struct file *file)
108{
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) {
83bc1d29 112 file_put_write_access(file);
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113 }
114}
115
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116/*
117 * super.c
118 */
8d0347f6 119extern int reconfigure_super(struct fs_context *);
d8ce82ef 120extern bool super_trylock_shared(struct super_block *sb);
4e7b5671 121struct super_block *user_get_super(dev_t, bool excl);
60b49885 122void put_super(struct super_block *sb);
20284ab7 123extern bool mount_capable(struct fs_context *);
439bc39b 124int sb_init_dio_done_wq(struct super_block *sb);
482928d5 125
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126/*
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.
132 */
133static inline void sb_start_ro_state_change(struct super_block *sb)
134{
135 WRITE_ONCE(sb->s_readonly_remount, 1);
136 /*
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
3e15dcf7
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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.
d7439fb1
JK
144 */
145 smp_wmb();
146}
147
148/*
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.
152 */
153static inline void sb_end_ro_state_change(struct super_block *sb)
154{
155 /*
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
161 * change.
162 */
163 smp_wmb();
164 WRITE_ONCE(sb->s_readonly_remount, 0);
165}
166
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167/*
168 * open.c
169 */
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170struct open_flags {
171 int open_flag;
a218d0fd 172 umode_t mode;
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173 int acc_mode;
174 int intent;
f9652e10 175 int lookup_flags;
47c805dc 176};
669abf4e 177extern struct file *do_filp_open(int dfd, struct filename *pathname,
f9652e10 178 const struct open_flags *op);
ffb37ca3 179extern struct file *do_file_open_root(const struct path *,
f9652e10 180 const char *, const struct open_flags *);
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181extern struct open_how build_open_how(int flags, umode_t mode);
182extern int build_open_flags(const struct open_how *how, struct open_flags *op);
6319194e 183extern struct file *__close_fd_get_file(unsigned int fd);
a8dade34 184
411d9475 185long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
1097742e 186int chmod_common(const struct path *path, umode_t mode);
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DB
187int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
188 int flag);
b873498f 189int chown_common(const struct path *path, uid_t user, gid_t group);
ae2bb293 190extern int vfs_open(const struct path *, struct file *);
becfd1f3 191
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AV
192/*
193 * inode.c
194 */
503c358c 195extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
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196int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry);
197bool in_group_or_capable(struct mnt_idmap *idmap,
11c2a870 198 const struct inode *inode, vfsgid_t vfsgid);
f23ce757
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199void lock_two_inodes(struct inode *inode1, struct inode *inode2,
200 unsigned subclass1, unsigned subclass2);
55fa6091 201
a66979ab
DC
202/*
203 * fs-writeback.c
204 */
3942c07c 205extern long get_nr_dirty_inodes(void);
e127b9bc 206void invalidate_inodes(struct super_block *sb);
a4464dbc
AV
207
208/*
209 * dcache.c
210 */
eed81007 211extern int d_set_mounted(struct dentry *dentry);
503c358c 212extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
ba65dc5e 213extern struct dentry *d_alloc_cursor(struct dentry *);
ab1152dd 214extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
7e5f7bb0 215extern char *simple_dname(struct dentry *, char *, int);
9bdebc2b
AV
216extern void dput_to_list(struct dentry *, struct list_head *);
217extern void shrink_dentry_list(struct list_head *);
06ae43f3 218
599a0ac1
AV
219/*
220 * pipe.c
221 */
222extern const struct file_operations pipefifo_fops;
8fa1f1c2
AV
223
224/*
225 * fs_pin.c
226 */
fdab684d 227extern void group_pin_kill(struct hlist_head *p);
8fa1f1c2 228extern void mnt_pin_kill(struct mount *m);
e149ed2b
AV
229
230/*
231 * fs/nsfs.c
232 */
be218aa2 233extern const struct dentry_operations ns_dentry_operations;
66cf191f 234
3934e36f
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235/*
236 * fs/stat.c:
237 */
1b6fe6e0
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238
239int getname_statx_lookup_flags(int flags);
240int do_statx(int dfd, struct filename *filename, unsigned int flags,
0018784f 241 unsigned int mask, struct statx __user *buffer);
b964bf53
AV
242
243/*
244 * fs/splice.c:
245 */
246long splice_file_to_pipe(struct file *in,
247 struct pipe_inode_info *opipe,
248 loff_t *offset,
249 size_t len, unsigned int flags);
1a91794c
SR
250
251/*
252 * fs/xattr.c:
253 */
254struct xattr_name {
255 char name[XATTR_NAME_MAX + 1];
256};
257
258struct xattr_ctx {
259 /* Value of attribute */
260 union {
261 const void __user *cvalue;
262 void __user *value;
263 };
264 void *kvalue;
265 size_t size;
266 /* Attribute name */
267 struct xattr_name *kname;
268 unsigned int flags;
269};
270
c975cad9 271
5a6f52d2 272ssize_t do_getxattr(struct mnt_idmap *idmap,
c975cad9
SR
273 struct dentry *d,
274 struct xattr_ctx *ctx);
275
1a91794c 276int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
5a6f52d2 277int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
1a91794c 278 struct xattr_ctx *ctx);
4609e1f1 279int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);
06bbaa6d 280
318e6685 281#ifdef CONFIG_FS_POSIX_ACL
5a6f52d2 282int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
318e6685 283 const char *acl_name, const void *kvalue, size_t size);
5a6f52d2 284ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
318e6685
CB
285 const char *acl_name, void *kvalue, size_t size);
286#else
5a6f52d2 287static inline int do_set_acl(struct mnt_idmap *idmap,
318e6685
CB
288 struct dentry *dentry, const char *acl_name,
289 const void *kvalue, size_t size)
290{
291 return -EOPNOTSUPP;
292}
5a6f52d2 293static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
318e6685
CB
294 struct dentry *dentry, const char *acl_name,
295 void *kvalue, size_t size)
296{
297 return -EOPNOTSUPP;
298}
299#endif
06bbaa6d
AV
300
301ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
72ae017c
CB
302
303/*
304 * fs/attr.c
305 */
3707d84c
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306struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns);
307struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
308void mnt_idmap_put(struct mnt_idmap *idmap);