1 files changed, 271 insertions, 56 deletions

diff --git a/fs/internal.h b/fs/internal.h
index 7c5f01cf619d..ab638d41ab81 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -1,40 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
 /* fs/ internal definitions
  *
  * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
  */
 
-#include <linux/lglock.h>
-
 struct super_block;
 struct file_system_type;
+struct iomap;
+struct iomap_ops;
 struct linux_binprm;
 struct path;
 struct mount;
+struct shrink_control;
+struct fs_context;
+struct pipe_inode_info;
+struct iov_iter;
+struct mnt_idmap;
+struct ns_common;
 
 /*
- * block_dev.c
+ * block/bdev.c
  */
 #ifdef CONFIG_BLOCK
 extern void __init bdev_cache_init(void);
-
-extern int __sync_blockdev(struct block_device *bdev, int wait);
-
 #else
 static inline void bdev_cache_init(void)
 {
 }
+#endif /* CONFIG_BLOCK */
 
-static inline int __sync_blockdev(struct block_device *bdev, int wait)
-{
-	return 0;
-}
-#endif
+/*
+ * buffer.c
+ */
+int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
+		get_block_t *get_block, const struct iomap *iomap);
 
 /*
  * char_dev.c
@@ -42,29 +42,56 @@ static inline int __sync_blockdev(struct block_device *bdev, int wait)
 extern void __init chrdev_init(void);
 
 /*
+ * fs_context.c
+ */
+extern const struct fs_context_operations legacy_fs_context_ops;
+extern int parse_monolithic_mount_data(struct fs_context *, void *);
+extern void vfs_clean_context(struct fs_context *fc);
+extern int finish_clean_context(struct fs_context *fc);
+
+/*
  * namei.c
  */
-extern int __inode_permission(struct inode *, int);
+extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
+			   struct path *path, const struct path *root);
+int do_rmdir(int dfd, struct filename *name);
+int do_unlinkat(int dfd, struct filename *name);
+int may_linkat(struct mnt_idmap *idmap, const struct path *link);
+int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
+		 struct filename *newname, unsigned int flags);
+int do_mkdirat(int dfd, struct filename *name, umode_t mode);
+int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
+int do_linkat(int olddfd, struct filename *old, int newdfd,
+			struct filename *new, int flags);
+int vfs_tmpfile(struct mnt_idmap *idmap,
+		const struct path *parentpath,
+		struct file *file, umode_t mode);
+struct dentry *d_hash_and_lookup(struct dentry *, struct qstr *);
+struct dentry *start_dirop(struct dentry *parent, struct qstr *name,
+			   unsigned int lookup_flags);
+int lookup_noperm_common(struct qstr *qname, struct dentry *base);
 
 /*
  * namespace.c
  */
-extern int copy_mount_options(const void __user *, unsigned long *);
-extern int copy_mount_string(const void __user *, char **);
-
-extern struct vfsmount *lookup_mnt(struct path *);
-extern int finish_automount(struct vfsmount *, struct path *);
+extern struct vfsmount *lookup_mnt(const struct path *);
+extern int finish_automount(struct vfsmount *, const struct path *);
 
 extern int sb_prepare_remount_readonly(struct super_block *);
 
 extern void __init mnt_init(void);
 
-extern struct lglock vfsmount_lock;
+int mnt_get_write_access_file(struct file *file);
+void mnt_put_write_access_file(struct file *file);
+
+extern void dissolve_on_fput(struct vfsmount *);
+extern bool may_mount(void);
 
-extern int __mnt_want_write(struct vfsmount *);
-extern int __mnt_want_write_file(struct file *);
-extern void __mnt_drop_write(struct vfsmount *);
-extern void __mnt_drop_write_file(struct file *);
+int path_mount(const char *dev_name, const struct path *path,
+		const char *type_page, unsigned long flags, void *data_page);
+int path_umount(const struct path *path, int flags);
+
+int show_path(struct seq_file *m, struct dentry *root);
 
 /*
  * fs_struct.c
@@ -74,19 +101,81 @@ extern void chroot_fs_refs(const struct path *, const struct path *);
 /*
  * file_table.c
  */
-extern void file_sb_list_add(struct file *f, struct super_block *sb);
-extern void file_sb_list_del(struct file *f);
-extern void mark_files_ro(struct super_block *);
-extern struct file *get_empty_filp(void);
+struct file *alloc_empty_file(int flags, const struct cred *cred);
+struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred);
+struct file *alloc_empty_backing_file(int flags, const struct cred *cred);
+void backing_file_set_user_path(struct file *f, const struct path *path);
+
+static inline void file_put_write_access(struct file *file)
+{
+	put_write_access(file->f_inode);
+	mnt_put_write_access(file->f_path.mnt);
+	if (unlikely(file->f_mode & FMODE_BACKING))
+		mnt_put_write_access(backing_file_user_path(file)->mnt);
+}
+
+static inline void put_file_access(struct file *file)
+{
+	if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
+		i_readcount_dec(file->f_inode);
+	} else if (file->f_mode & FMODE_WRITER) {
+		file_put_write_access(file);
+	}
+}
+
+void fput_close_sync(struct file *);
+void fput_close(struct file *);
 
 /*
  * super.c
  */
-extern int do_remount_sb(struct super_block *, int, void *, int);
-extern bool grab_super_passive(struct super_block *sb);
-extern struct dentry *mount_fs(struct file_system_type *,
-			       int, const char *, void *);
-extern struct super_block *user_get_super(dev_t);
+extern int reconfigure_super(struct fs_context *);
+extern bool super_trylock_shared(struct super_block *sb);
+struct super_block *user_get_super(dev_t, bool excl);
+void put_super(struct super_block *sb);
+extern bool mount_capable(struct fs_context *);
+int sb_init_dio_done_wq(struct super_block *sb);
+
+/*
+ * Prepare superblock for changing its read-only state (i.e., either remount
+ * read-write superblock read-only or vice versa). After this function returns
+ * mnt_is_readonly() will return true for any mount of the superblock if its
+ * caller is able to observe any changes done by the remount. This holds until
+ * sb_end_ro_state_change() is called.
+ */
+static inline void sb_start_ro_state_change(struct super_block *sb)
+{
+	WRITE_ONCE(sb->s_readonly_remount, 1);
+	/*
+	 * For RO->RW transition, the barrier pairs with the barrier in
+	 * mnt_is_readonly() making sure if mnt_is_readonly() sees SB_RDONLY
+	 * cleared, it will see s_readonly_remount set.
+	 * For RW->RO transition, the barrier pairs with the barrier in
+	 * mnt_get_write_access() before the mnt_is_readonly() check.
+	 * The barrier makes sure if mnt_get_write_access() sees MNT_WRITE_HOLD
+	 * already cleared, it will see s_readonly_remount set.
+	 */
+	smp_wmb();
+}
+
+/*
+ * Ends section changing read-only state of the superblock. After this function
+ * returns if mnt_is_readonly() returns false, the caller will be able to
+ * observe all the changes remount did to the superblock.
+ */
+static inline void sb_end_ro_state_change(struct super_block *sb)
+{
+	/*
+	 * This barrier provides release semantics that pairs with
+	 * the smp_rmb() acquire semantics in mnt_is_readonly().
+	 * This barrier pair ensure that when mnt_is_readonly() sees
+	 * 0 for sb->s_readonly_remount, it will also see all the
+	 * preceding flag changes that were made during the RO state
+	 * change.
+	 */
+	smp_wmb();
+	WRITE_ONCE(sb->s_readonly_remount, 0);
+}
 
 /*
  * open.c
@@ -100,46 +189,172 @@ struct open_flags {
 };
 extern struct file *do_filp_open(int dfd, struct filename *pathname,
 		const struct open_flags *op);
-extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
+extern struct file *do_file_open_root(const struct path *,
 		const char *, const struct open_flags *);
+extern struct open_how build_open_how(int flags, umode_t mode);
+extern int build_open_flags(const struct open_how *how, struct open_flags *op);
+struct file *file_close_fd_locked(struct files_struct *files, unsigned fd);
 
-extern long do_handle_open(int mountdirfd,
-			   struct file_handle __user *ufh, int open_flag);
-extern int open_check_o_direct(struct file *f);
+int do_ftruncate(struct file *file, loff_t length, int small);
+int do_sys_ftruncate(unsigned int fd, loff_t length, int small);
+int chmod_common(const struct path *path, umode_t mode);
+int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
+		int flag);
+int chown_common(const struct path *path, uid_t user, gid_t group);
+extern int vfs_open(const struct path *, struct file *);
 
 /*
  * inode.c
  */
-extern spinlock_t inode_sb_list_lock;
-extern void inode_add_lru(struct inode *inode);
+extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
+int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry);
+bool in_group_or_capable(struct mnt_idmap *idmap,
+			 const struct inode *inode, vfsgid_t vfsgid);
 
 /*
  * fs-writeback.c
  */
-extern void inode_wb_list_del(struct inode *inode);
-
-extern int get_nr_dirty_inodes(void);
-extern void evict_inodes(struct super_block *);
-extern int invalidate_inodes(struct super_block *, bool);
+extern long get_nr_dirty_inodes(void);
 
 /*
  * dcache.c
  */
-extern struct dentry *__d_alloc(struct super_block *, const struct qstr *);
+extern int d_set_mounted(struct dentry *dentry);
+extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
+extern struct dentry *d_alloc_cursor(struct dentry *);
+extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
+extern char *simple_dname(struct dentry *, char *, int);
+extern void dput_to_list(struct dentry *, struct list_head *);
+extern void shrink_dentry_list(struct list_head *);
+extern void shrink_dcache_for_umount(struct super_block *);
+extern struct dentry *__d_lookup(const struct dentry *, const struct qstr *);
+extern struct dentry *__d_lookup_rcu(const struct dentry *parent,
+				const struct qstr *name, unsigned *seq);
 
 /*
- * read_write.c
+ * pipe.c
  */
-extern ssize_t __kernel_write(struct file *, const char *, size_t, loff_t *);
-extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
+extern const struct file_operations pipefifo_fops;
 
 /*
- * splice.c
+ * fs_pin.c
  */
-extern long do_splice_direct(struct file *in, loff_t *ppos, struct file *out,
-		loff_t *opos, size_t len, unsigned int flags);
+extern void group_pin_kill(struct hlist_head *p);
+extern void mnt_pin_kill(struct mount *m);
 
 /*
- * pipe.c
+ * fs/nsfs.c
  */
-extern const struct file_operations pipefifo_fops;
+extern const struct dentry_operations ns_dentry_operations;
+int open_namespace(struct ns_common *ns);
+
+/*
+ * fs/stat.c:
+ */
+
+int do_statx(int dfd, struct filename *filename, unsigned int flags,
+	     unsigned int mask, struct statx __user *buffer);
+int do_statx_fd(int fd, unsigned int flags, unsigned int mask,
+		struct statx __user *buffer);
+
+/*
+ * fs/splice.c:
+ */
+ssize_t splice_file_to_pipe(struct file *in,
+			    struct pipe_inode_info *opipe,
+			    loff_t *offset,
+			    size_t len, unsigned int flags);
+
+/*
+ * fs/xattr.c:
+ */
+struct xattr_name {
+	char name[XATTR_NAME_MAX + 1];
+};
+
+struct kernel_xattr_ctx {
+	/* Value of attribute */
+	union {
+		const void __user *cvalue;
+		void __user *value;
+	};
+	void *kvalue;
+	size_t size;
+	/* Attribute name */
+	struct xattr_name *kname;
+	unsigned int flags;
+};
+
+ssize_t file_getxattr(struct file *file, struct kernel_xattr_ctx *ctx);
+ssize_t filename_getxattr(int dfd, struct filename *filename,
+			  unsigned int lookup_flags, struct kernel_xattr_ctx *ctx);
+int file_setxattr(struct file *file, struct kernel_xattr_ctx *ctx);
+int filename_setxattr(int dfd, struct filename *filename,
+		      unsigned int lookup_flags, struct kernel_xattr_ctx *ctx);
+int setxattr_copy(const char __user *name, struct kernel_xattr_ctx *ctx);
+int import_xattr_name(struct xattr_name *kname, const char __user *name);
+
+int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);
+
+#ifdef CONFIG_FS_POSIX_ACL
+int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+	       const char *acl_name, const void *kvalue, size_t size);
+ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
+		   const char *acl_name, void *kvalue, size_t size);
+#else
+static inline int do_set_acl(struct mnt_idmap *idmap,
+			     struct dentry *dentry, const char *acl_name,
+			     const void *kvalue, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
+				 struct dentry *dentry, const char *acl_name,
+				 void *kvalue, size_t size)
+{
+	return -EOPNOTSUPP;
+}
+#endif
+
+ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
+
+/*
+ * fs/attr.c
+ */
+struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns);
+struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
+void mnt_idmap_put(struct mnt_idmap *idmap);
+struct stashed_operations {
+	struct dentry *(*stash_dentry)(struct dentry **stashed,
+				       struct dentry *dentry);
+	void (*put_data)(void *data);
+	int (*init_inode)(struct inode *inode, void *data);
+};
+int path_from_stashed(struct dentry **stashed, struct vfsmount *mnt, void *data,
+		      struct path *path);
+void stashed_dentry_prune(struct dentry *dentry);
+struct dentry *stash_dentry(struct dentry **stashed, struct dentry *dentry);
+struct dentry *stashed_dentry_get(struct dentry **stashed);
+/**
+ * path_mounted - check whether path is mounted
+ * @path: path to check
+ *
+ * Determine whether @path refers to the root of a mount.
+ *
+ * Return: true if @path is the root of a mount, false if not.
+ */
+static inline bool path_mounted(const struct path *path)
+{
+	return path->mnt->mnt_root == path->dentry;
+}
+void file_f_owner_release(struct file *file);
+bool file_seek_cur_needs_f_lock(struct file *file);
+int statmount_mnt_idmap(struct mnt_idmap *idmap, struct seq_file *seq, bool uid_map);
+struct dentry *find_next_child(struct dentry *parent, struct dentry *prev);
+int anon_inode_getattr(struct mnt_idmap *idmap, const struct path *path,
+		       struct kstat *stat, u32 request_mask,
+		       unsigned int query_flags);
+int anon_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+		       struct iattr *attr);
+void pidfs_get_root(struct path *path);
+void nsfs_get_root(struct path *path);