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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2016 Joyent, Inc.
*/
#ifndef _LXD_H
#define _LXD_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* lxd.h: declarations, data structures and macros for lxd (lxd devfs).
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/policy.h>
#include <sys/dirent.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/pathname.h>
#include <sys/systm.h>
#include <sys/var.h>
#include <sys/sysmacros.h>
#include <sys/cred.h>
#include <sys/priv.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/statvfs.h>
#include <sys/cmn_err.h>
#include <sys/zone.h>
#include <sys/uio.h>
#include <sys/utsname.h>
#include <sys/atomic.h>
#include <vm/anon.h>
#include <sys/lx_types.h>
#if defined(_KERNEL)
#include <sys/lx_brand.h>
/*
* It's unlikely that we need to create more than 50-60 subdirs/symlinks
* as front files so we size the file system hash for 2x that number.
* The back devfs typically has ~80 nodes so this is also a comfortable size
* for the back hash table.
*/
#define LXD_HASH_SZ 128
#define LXD_BACK_HASH(v) ((((intptr_t)(v)) >> 10) & ((LXD_HASH_SZ) - 1))
#define LXD_NM_HASH(ldn, name, hash) \
{ \
char Xc, *Xcp; \
hash = (uint_t)(uintptr_t)(ldn) >> 8; \
for (Xcp = (name); (Xc = *Xcp) != 0; Xcp++) \
hash = (hash << 4) + hash + (uint_t)Xc; \
hash &= (LXD_HASH_SZ - 1); \
}
enum lxd_node_type { LXDNT_NONE, LXDNT_BACK, LXDNT_FRONT };
typedef struct lxd_dev_attr {
list_node_t lxda_link;
char lxda_name[MAXPATHLEN];
uid_t lxda_uid;
gid_t lxda_gid;
mode_t lxda_mode;
} lxd_dev_attr_t;
/*
* lxd per-mount data structure.
*
* All fields are protected by lxd_contents.
* File renames on a specific file system are protected lxdm_renamelck.
*/
typedef struct lxd_mnt {
struct vfs *lxdm_vfsp; /* filesystem's vfs struct */
struct lxd_node *lxdm_rootnode; /* root lxd_node */
char *lxdm_mntpath; /* name of lxd mount point */
dev_t lxdm_dev; /* unique dev # of mounted `device' */
kmutex_t lxdm_contents; /* per-mount lock */
kmutex_t lxdm_renamelck; /* rename lock for this mount */
kmutex_t lxdm_attrlck; /* per-mount attr. file lock */
list_t lxdm_devattrs; /* list of device attr. settings */
uint_t lxdm_gen; /* node ID source for files */
/* protects buckets in both "dir ent" and "back" hash tables */
kmutex_t lxdm_hash_mutex[LXD_HASH_SZ];
/* per-mount data for "back" vnodes in the fs */
uint_t lxdm_back_refcnt; /* # outstanding "back" vnodes */
struct lxd_node *lxdm_back_htable[LXD_HASH_SZ];
/*
* Per-mount directory data for "front" nodes in the fs.
* Each front node has a directory entry but directory entries can live
* on either front or back nodes.
*/
uint_t lxdm_dent_refcnt; /* # outstanding dir ents */
struct lxd_dirent *lxdm_dent_htable[LXD_HASH_SZ];
} lxd_mnt_t;
/*
* lxd_node is the file system dependent node for lxd.
*
* The node is used to represent both front and back files. For front files
* the node can represent either a directory or symlink.
*/
typedef struct lxd_node {
enum lxd_node_type lxdn_type;
/* Data for "front" nodes */
struct lxd_node *lxdn_prev; /* lnked lst of lxd nodes */
struct lxd_node *lxdn_next; /* lnked lst of lxd nodes */
struct lxd_node *lxdn_parent; /* dir containing this node */
krwlock_t lxdn_rwlock; /* serialize mods/dir updates */
kmutex_t lxdn_tlock; /* time, flag, and nlink lock */
/* these could be in a union ala tmpfs but not really necessary */
uint_t lxdn_dirents; /* number of dirents */
struct lxd_dirent *lxdn_dir; /* dirent list */
char *lxdn_symlink; /* pointer to symlink */
struct vattr lxdn_attr; /* attributes */
/* Hash table link */
struct lxd_node *lxdn_hnxt; /* link in per-mount entry */
/* hash table */
vnode_t *lxdn_vnode; /* vnode for this lxd_node */
vnode_t *lxdn_real_vp; /* back file - real vnode */
} lxd_node_t;
/*
* Attributes
*/
#define lxdn_mask lxdn_attr.va_mask
#define lxdn_mode lxdn_attr.va_mode
#define lxdn_uid lxdn_attr.va_uid
#define lxdn_gid lxdn_attr.va_gid
#define lxdn_fsid lxdn_attr.va_fsid
#define lxdn_nodeid lxdn_attr.va_nodeid
#define lxdn_nlink lxdn_attr.va_nlink
#define lxdn_size lxdn_attr.va_size
#define lxdn_atime lxdn_attr.va_atime
#define lxdn_mtime lxdn_attr.va_mtime
#define lxdn_ctime lxdn_attr.va_ctime
#define lxdn_rdev lxdn_attr.va_rdev
#define lxdn_blksize lxdn_attr.va_blksize
#define lxdn_nblocks lxdn_attr.va_nblocks
#define lxdn_seq lxdn_attr.va_seq
/*
* lx devfs conversion macros
*/
#define VFSTOLXDM(vfsp) ((lxd_mnt_t *)(vfsp)->vfs_data)
#define VTOLXDM(vp) ((lxd_mnt_t *)(vp)->v_vfsp->vfs_data)
#define VTOLDN(vp) ((lxd_node_t *)(vp)->v_data)
#define LDNTOV(ln) ((ln)->lxdn_vnode)
#define ldnode_hold(ln) VN_HOLD(LDNTOV(ln))
#define ldnode_rele(ln) VN_RELE(LDNTOV(ln))
#define REALVP(vp) (VTOLDN(vp)->lxdn_real_vp)
/*
* front directories are made up of a linked list of lxd_dirent structures
* hanging off directory lxdn_nodes. File names are not fixed length, but are
* null terminated.
*/
typedef struct lxd_dirent {
lxd_node_t *lddir_node; /* lxd node for this file */
struct lxd_dirent *lddir_next; /* next directory entry */
struct lxd_dirent *lddir_prev; /* prev directory entry */
uint_t lddir_offset; /* "offset" of dir entry */
uint_t lddir_hash; /* a hash of lddir_name */
struct lxd_dirent *lddir_link; /* linked via hash table */
lxd_node_t *lddir_parent; /* parent, dir we are in */
char *lddir_name; /* null terminated */
} lxd_dirent_t;
enum de_op { DE_CREATE, DE_MKDIR, DE_RENAME }; /* direnter ops */
enum dr_op { DR_REMOVE, DR_RMDIR, DR_RENAME }; /* dirremove ops */
typedef struct lxd_minor_translator {
char *lxd_mt_path; /* illumos minor node path */
minor_t lxd_mt_minor; /* illumos minor node number */
int lxd_mt_lx_major; /* linux major node number */
int lxd_mt_lx_minor; /* linux minor node number */
} lxd_minor_translator_t;
enum lxd_xl_tp { DTT_INVALID, DTT_LIST, DTT_CUSTOM };
#define xl_list lxd_xl_minor.lxd_xl_list
#define xl_custom lxd_xl_minor.lxd_xl_custom
typedef struct lxd_devt_translator {
char *lxd_xl_driver; /* driver name */
major_t lxd_xl_major; /* driver number */
enum lxd_xl_tp lxd_xl_type; /* dictates how we intrep. xl_minor */
union {
uintptr_t lxd_xl_foo; /* required to compile */
lxd_minor_translator_t *lxd_xl_list;
void (*lxd_xl_custom)(dev_t, dev_t *);
} lxd_xl_minor;
} lxd_devt_translator_t;
extern struct vnodeops *lxd_vnodeops;
extern lxd_devt_translator_t lxd_devt_translators[];
vnode_t *lxd_make_back_node(vnode_t *, lxd_mnt_t *);
void lxd_free_back_node(lxd_node_t *);
int lxd_dirdelete(lxd_node_t *, lxd_node_t *, char *, enum dr_op, cred_t *);
int lxd_direnter(lxd_mnt_t *, lxd_node_t *, char *, enum de_op, lxd_node_t *,
lxd_node_t *, struct vattr *, lxd_node_t **, cred_t *);
void lxd_dirinit(lxd_node_t *, lxd_node_t *);
int lxd_dirlookup(lxd_node_t *, char *, lxd_node_t **, cred_t *);
void lxd_dirtrunc(lxd_node_t *);
void lxd_node_init(lxd_mnt_t *, lxd_node_t *, vnode_t *, vattr_t *, cred_t *);
int lxd_naccess(void *, int, cred_t *);
void lxd_save_attrs(lxd_mnt_t *, vnode_t *);
void lxd_apply_db(lxd_mnt_t *);
#endif /* KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _LXD_H */
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