/* SPDX-License-Identifier: GPL-2.0-or-later */
/* fs/ internal definitions
*
* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
* Written by David Howells ([email protected])
*/
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/bdev.c
*/
#ifdef CONFIG_BLOCK
extern void __init bdev_cache_init(void);
#else
static inline void bdev_cache_init(void)
{
}
#endif /* CONFIG_BLOCK */
/*
* 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
*/
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 filename_lookup(int dfd, struct filename *name, unsigned flags,
struct path *path, 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);
/*
* namespace.c
*/
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);
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);
int path_mount(const char *dev_name, struct path *path,
const char *type_page, unsigned long flags, void *data_page);
int path_umount(struct path *path, int flags);
int show_path(struct seq_file *m, struct dentry *root);
/*
* fs_struct.c
*/
extern void chroot_fs_refs(const struct path *, const struct path *);
/*
* file_table.c
*/
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);
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);
}
}
/*
* super.c
*/
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
*/
struct open_flags {
int open_flag;
umode_t mode;
int acc_mode;
int intent;
int lookup_flags;
};
extern struct file *do_filp_open(int dfd, struct filename *pathname,
const struct open_flags *op);
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);
long do_ftruncate(struct file *file, loff_t length, int small);
long 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 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 long get_nr_dirty_inodes(void);
void invalidate_inodes(struct super_block *sb);
/*
* dcache.c
*/
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);
extern void d_genocide(struct dentry *);
/*
* pipe.c
*/
extern const struct file_operations pipefifo_fops;
/*
* fs_pin.c
*/
extern void group_pin_kill(struct hlist_head *p);
extern void mnt_pin_kill(struct mount *m);
/*
* fs/nsfs.c
*/
extern const struct dentry_operations ns_dentry_operations;
int open_namespace(struct ns_common *ns);
/*
* fs/stat.c:
*/
int getname_statx_lookup_flags(int flags);
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 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 do_getxattr(struct mnt_idmap *idmap,
struct dentry *d,
struct xattr_ctx *ctx);
int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
struct xattr_ctx *ctx);
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 {
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);
/**
* 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);
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