mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 02:36:53 +07:00
d2912cb15b
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
*
|
|
* Copyright (C) 2011 Novell Inc.
|
|
* Copyright (C) 2016 Red Hat, Inc.
|
|
*/
|
|
|
|
struct ovl_config {
|
|
char *lowerdir;
|
|
char *upperdir;
|
|
char *workdir;
|
|
bool default_permissions;
|
|
bool redirect_dir;
|
|
bool redirect_follow;
|
|
const char *redirect_mode;
|
|
bool index;
|
|
bool nfs_export;
|
|
int xino;
|
|
bool metacopy;
|
|
};
|
|
|
|
struct ovl_sb {
|
|
struct super_block *sb;
|
|
dev_t pseudo_dev;
|
|
};
|
|
|
|
struct ovl_layer {
|
|
struct vfsmount *mnt;
|
|
/* Trap in ovl inode cache */
|
|
struct inode *trap;
|
|
struct ovl_sb *fs;
|
|
/* Index of this layer in fs root (upper idx == 0) */
|
|
int idx;
|
|
/* One fsid per unique underlying sb (upper fsid == 0) */
|
|
int fsid;
|
|
};
|
|
|
|
struct ovl_path {
|
|
struct ovl_layer *layer;
|
|
struct dentry *dentry;
|
|
};
|
|
|
|
/* private information held for overlayfs's superblock */
|
|
struct ovl_fs {
|
|
struct vfsmount *upper_mnt;
|
|
unsigned int numlower;
|
|
/* Number of unique lower sb that differ from upper sb */
|
|
unsigned int numlowerfs;
|
|
struct ovl_layer *lower_layers;
|
|
struct ovl_sb *lower_fs;
|
|
/* workbasedir is the path at workdir= mount option */
|
|
struct dentry *workbasedir;
|
|
/* workdir is the 'work' directory under workbasedir */
|
|
struct dentry *workdir;
|
|
/* index directory listing overlay inodes by origin file handle */
|
|
struct dentry *indexdir;
|
|
long namelen;
|
|
/* pathnames of lower and upper dirs, for show_options */
|
|
struct ovl_config config;
|
|
/* creds of process who forced instantiation of super block */
|
|
const struct cred *creator_cred;
|
|
bool tmpfile;
|
|
bool noxattr;
|
|
/* Did we take the inuse lock? */
|
|
bool upperdir_locked;
|
|
bool workdir_locked;
|
|
/* Traps in ovl inode cache */
|
|
struct inode *upperdir_trap;
|
|
struct inode *workdir_trap;
|
|
struct inode *indexdir_trap;
|
|
/* Inode numbers in all layers do not use the high xino_bits */
|
|
unsigned int xino_bits;
|
|
};
|
|
|
|
/* private information held for every overlayfs dentry */
|
|
struct ovl_entry {
|
|
union {
|
|
struct {
|
|
unsigned long flags;
|
|
};
|
|
struct rcu_head rcu;
|
|
};
|
|
unsigned numlower;
|
|
struct ovl_path lowerstack[];
|
|
};
|
|
|
|
struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
|
|
|
|
static inline struct ovl_entry *OVL_E(struct dentry *dentry)
|
|
{
|
|
return (struct ovl_entry *) dentry->d_fsdata;
|
|
}
|
|
|
|
struct ovl_inode {
|
|
union {
|
|
struct ovl_dir_cache *cache; /* directory */
|
|
struct inode *lowerdata; /* regular file */
|
|
};
|
|
const char *redirect;
|
|
u64 version;
|
|
unsigned long flags;
|
|
struct inode vfs_inode;
|
|
struct dentry *__upperdentry;
|
|
struct inode *lower;
|
|
|
|
/* synchronize copy up and more */
|
|
struct mutex lock;
|
|
};
|
|
|
|
static inline struct ovl_inode *OVL_I(struct inode *inode)
|
|
{
|
|
return container_of(inode, struct ovl_inode, vfs_inode);
|
|
}
|
|
|
|
static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
|
|
{
|
|
return READ_ONCE(oi->__upperdentry);
|
|
}
|