mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 03:40:04 +00:00
9bc61ab18b
Introduce a filesystem context concept to be used during superblock creation for mount and superblock reconfiguration for remount. This is allocated at the beginning of the mount procedure and into it is placed: (1) Filesystem type. (2) Namespaces. (3) Source/Device names (there may be multiple). (4) Superblock flags (SB_*). (5) Security details. (6) Filesystem-specific data, as set by the mount options. Accessor functions are then provided to set up a context, parameterise it from monolithic mount data (the data page passed to mount(2)) and tear it down again. A legacy wrapper is provided that implements what will be the basic operations, wrapping access to filesystems that aren't yet aware of the fs_context. Finally, vfs_kern_mount() is changed to make use of the fs_context and mount_fs() is replaced by vfs_get_tree(), called from vfs_kern_mount(). [AV -- add missing kstrdup()] [AV -- put_cred() can be unconditional - fc->cred can't be NULL] [AV -- take legacy_validate() contents into legacy_parse_monolithic()] [AV -- merge KERNEL_MOUNT and USER_MOUNT] [AV -- don't unlock superblock on success return from vfs_get_tree()] [AV -- kill 'reference' argument of init_fs_context()] Signed-off-by: David Howells <dhowells@redhat.com> Co-developed-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
197 lines
5.1 KiB
C
197 lines
5.1 KiB
C
/* 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.
|
|
*/
|
|
|
|
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;
|
|
|
|
/*
|
|
* block_dev.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)
|
|
{
|
|
}
|
|
|
|
static inline int __sync_blockdev(struct block_device *bdev, int wait)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* buffer.c
|
|
*/
|
|
extern void guard_bio_eod(int rw, struct bio *bio);
|
|
extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
|
|
get_block_t *get_block, struct iomap *iomap);
|
|
int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
|
|
struct page *page);
|
|
|
|
/*
|
|
* char_dev.c
|
|
*/
|
|
extern void __init chrdev_init(void);
|
|
|
|
/*
|
|
* fs_context.c
|
|
*/
|
|
extern int legacy_get_tree(struct fs_context *fc);
|
|
extern int parse_monolithic_mount_data(struct fs_context *, void *);
|
|
|
|
/*
|
|
* namei.c
|
|
*/
|
|
extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);
|
|
extern int vfs_path_lookup(struct dentry *, struct vfsmount *,
|
|
const char *, unsigned int, struct path *);
|
|
long do_mknodat(int dfd, const char __user *filename, umode_t mode,
|
|
unsigned int dev);
|
|
long do_mkdirat(int dfd, const char __user *pathname, umode_t mode);
|
|
long do_rmdir(int dfd, const char __user *pathname);
|
|
long do_unlinkat(int dfd, struct filename *name);
|
|
long do_symlinkat(const char __user *oldname, int newdfd,
|
|
const char __user *newname);
|
|
int do_linkat(int olddfd, const char __user *oldname, int newdfd,
|
|
const char __user *newname, int flags);
|
|
|
|
/*
|
|
* namespace.c
|
|
*/
|
|
extern void *copy_mount_options(const void __user *);
|
|
extern char *copy_mount_string(const void __user *);
|
|
|
|
extern struct vfsmount *lookup_mnt(const struct path *);
|
|
extern int finish_automount(struct vfsmount *, struct path *);
|
|
|
|
extern int sb_prepare_remount_readonly(struct super_block *);
|
|
|
|
extern void __init mnt_init(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 *);
|
|
|
|
/*
|
|
* fs_struct.c
|
|
*/
|
|
extern void chroot_fs_refs(const struct path *, const struct path *);
|
|
|
|
/*
|
|
* file_table.c
|
|
*/
|
|
extern struct file *alloc_empty_file(int, const struct cred *);
|
|
extern struct file *alloc_empty_file_noaccount(int, const struct cred *);
|
|
|
|
/*
|
|
* super.c
|
|
*/
|
|
extern int do_remount_sb(struct super_block *, int, void *, int);
|
|
extern bool trylock_super(struct super_block *sb);
|
|
extern struct super_block *user_get_super(dev_t);
|
|
|
|
/*
|
|
* 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(struct dentry *, struct vfsmount *,
|
|
const char *, const struct open_flags *);
|
|
|
|
long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
|
|
long do_faccessat(int dfd, const char __user *filename, int mode);
|
|
int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
|
|
int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
|
|
int flag);
|
|
|
|
extern int vfs_open(const struct path *, struct file *);
|
|
|
|
/*
|
|
* inode.c
|
|
*/
|
|
extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
|
|
extern void inode_add_lru(struct inode *inode);
|
|
extern int dentry_needs_remove_privs(struct dentry *dentry);
|
|
|
|
/*
|
|
* fs-writeback.c
|
|
*/
|
|
extern void inode_io_list_del(struct inode *inode);
|
|
|
|
extern long get_nr_dirty_inodes(void);
|
|
extern int invalidate_inodes(struct super_block *, bool);
|
|
|
|
/*
|
|
* 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 *);
|
|
|
|
/*
|
|
* read_write.c
|
|
*/
|
|
extern int rw_verify_area(int, struct file *, const loff_t *, size_t);
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* fs/ioctl.c
|
|
*/
|
|
extern int do_vfs_ioctl(struct file *file, unsigned int fd, unsigned int cmd,
|
|
unsigned long arg);
|
|
|
|
/*
|
|
* iomap support:
|
|
*/
|
|
typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
|
|
void *data, struct iomap *iomap);
|
|
|
|
loff_t iomap_apply(struct inode *inode, loff_t pos, loff_t length,
|
|
unsigned flags, const struct iomap_ops *ops, void *data,
|
|
iomap_actor_t actor);
|
|
|
|
/* direct-io.c: */
|
|
int sb_init_dio_done_wq(struct super_block *sb);
|