mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
ba65dc5ef1
d_walk() relies upon the tree not getting rearranged under it without rename_lock being touched. And we do grab rename_lock around the places that change the tree topology. Unfortunately, branch reordering is just as bad from d_walk() POV and we have two places that do it without touching rename_lock - one in handling of cursors (for ramfs-style directories) and another in autofs. autofs one is a separate story; this commit deals with the cursors. * mark cursor dentries explicitly at allocation time * make __dentry_kill() leave ->d_child.next pointing to the next non-cursor sibling, making sure that it won't be moved around unnoticed before the parent is relocked on ascend-to-parent path in d_walk(). * make d_walk() skip cursors explicitly; strictly speaking it's not necessary (all callbacks we pass to d_walk() are no-ops on cursors), but it makes analysis easier. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
162 lines
3.8 KiB
C
162 lines
3.8 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 linux_binprm;
|
|
struct path;
|
|
struct mount;
|
|
struct shrink_control;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* char_dev.c
|
|
*/
|
|
extern void __init chrdev_init(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 *);
|
|
|
|
/*
|
|
* namespace.c
|
|
*/
|
|
extern void *copy_mount_options(const void __user *);
|
|
extern char *copy_mount_string(const void __user *);
|
|
|
|
extern struct vfsmount *lookup_mnt(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 *get_empty_filp(void);
|
|
|
|
/*
|
|
* super.c
|
|
*/
|
|
extern int do_remount_sb(struct super_block *, int, void *, int);
|
|
extern bool trylock_super(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);
|
|
|
|
/*
|
|
* 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 *);
|
|
|
|
extern long do_handle_open(int mountdirfd,
|
|
struct file_handle __user *ufh, int open_flag);
|
|
extern int open_check_o_direct(struct file *f);
|
|
extern int vfs_open(const struct path *, struct file *, const struct cred *);
|
|
|
|
/*
|
|
* inode.c
|
|
*/
|
|
extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
|
|
extern void inode_add_lru(struct inode *inode);
|
|
|
|
/*
|
|
* fs-writeback.c
|
|
*/
|
|
extern void inode_io_list_del(struct inode *inode);
|
|
|
|
extern long get_nr_dirty_inodes(void);
|
|
extern void evict_inodes(struct super_block *);
|
|
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 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);
|
|
extern long vfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
|