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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 _LXCGRPS_H
#define _LXCGRPS_H
#ifdef __cplusplus
extern "C" {
#endif
/*
* cgrps.h: declarations, data structures and macros for lx_cgroup
*/
#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>
/*
* cgrpmgr ioctl interface.
*/
#define CGRPFS_IOC ('C' << 16 | 'G' << 8)
#define CGRPFS_GETEVNT (CGRPFS_IOC | 1)
typedef struct cgrpmgr_info {
pid_t cgmi_pid;
char *cgmi_rel_agent_path;
char *cgmi_cgroup_path;
} cgrpmgr_info_t;
#if defined(_KERNEL)
#include <sys/lx_brand.h>
typedef struct cgrpmgr_info32 {
pid_t cgmi_pid;
caddr32_t cgmi_rel_agent_path;
caddr32_t cgmi_cgroup_path;
} cgrpmgr_info32_t;
#define CG_PSNSIZE 256 /* max size of pseudo file name entries */
#define CG_PSDSIZE 16 /* pretend that a dir entry takes 16 bytes */
/*
* The order of these entries must be in sync with the cg_ssde_dir array.
*/
typedef enum cgrp_ssid {
CG_SSID_GENERIC = 1,
CG_SSID_NUM /* last ssid for range checking */
} cgrp_ssid_t;
typedef enum cgrp_nodetype {
CG_CGROUP_DIR = 1, /* cgroup directory entry */
CG_NOTIFY, /* notify_on_release file */
CG_PROCS, /* cgroup.procs file */
CG_REL_AGENT, /* release_agent file */
CG_TASKS, /* tasks file */
} cgrp_nodetype_t;
typedef struct cgrp_subsys_dirent {
cgrp_nodetype_t cgrp_ssd_type;
char *cgrp_ssd_name;
} cgrp_subsys_dirent_t;
#define N_DIRENTS(m) (cgrp_num_pseudo_ents((m)->cg_ssid) + 2)
/*
* A modern systemd-based Linux system typically has 50-60 cgroups so
* we size the hash for 2x that number.
*/
#define CGRP_HASH_SZ 128
#define CGRP_AGENT_LEN (MAXPATHLEN + 1)
/*
* cgroups per-mount data structure.
*
* All but the event related fields are protected by cg_contents.
* The evnt_list and counter is protected by cg_events.
*/
typedef struct cgrp_mnt {
struct vfs *cg_vfsp; /* filesystem's vfs struct */
struct cgrp_node *cg_rootnode; /* root cgrp_node */
char *cg_mntpath; /* name of cgroup mount point */
cgrp_ssid_t cg_ssid; /* subsystem type */
dev_t cg_dev; /* unique dev # of mounted `device' */
uint_t cg_gen; /* node ID source for files */
uint_t cg_grp_gen; /* ID source for cgroups */
kmutex_t cg_contents; /* global lock for most fs activity */
char cg_agent[CGRP_AGENT_LEN]; /* release_agent path */
/* ptr to zone data for containing zone */
lx_zone_data_t *cg_lxzdata;
struct cgrp_node **cg_grp_hash; /* hash list of cgroups in the fs */
} cgrp_mnt_t;
/*
* cgrp_node is the file system dependent node for cgroups.
*
* The node is used to represent both directories (a cgroup) and pseudo files
* within the directory.
*
* Members are tagged in the comment to note which type of node they apply to:
* A - all
* D - dir (i.e. a cgroup)
* F - pseudo file
*/
typedef struct cgrp_node {
struct cgrp_node *cgn_back; /* A lnked lst of cgrp_nodes */
struct cgrp_node *cgn_forw; /* A lnked lst of cgrp_nodes */
struct cgrp_dirent *cgn_dir; /* D dirent list */
struct cgrp_node *cgn_parent; /* A dir containing this node */
struct cgrp_node *cgn_next; /* D link in per-mount cgroup */
/* hash table */
uint_t cgn_dirents; /* D number of dirents */
cgrp_nodetype_t cgn_type; /* A type for this node */
uint_t cgn_notify; /* D notify_on_release value */
uint_t cgn_task_cnt; /* D number of threads in grp */
struct vnode *cgn_vnode; /* A vnode for this cgrp_node */
uint_t cgn_id; /* D ID number for the cgroup */
struct vattr cgn_attr; /* A attributes */
} cgrp_node_t;
/*
* File system independent to cgroups conversion macros
*/
#define VFSTOCGM(vfsp) ((cgrp_mnt_t *)(vfsp)->vfs_data)
#define VTOCGM(vp) ((cgrp_mnt_t *)(vp)->v_vfsp->vfs_data)
#define VTOCGN(vp) ((struct cgrp_node *)(vp)->v_data)
#define CGNTOV(cn) ((cn)->cgn_vnode)
#define cgnode_hold(cn) VN_HOLD(CGNTOV(cn))
#define cgnode_rele(cn) VN_RELE(CGNTOV(cn))
/*
* Attributes
*/
#define cgn_mask cgn_attr.va_mask
#define cgn_mode cgn_attr.va_mode
#define cgn_uid cgn_attr.va_uid
#define cgn_gid cgn_attr.va_gid
#define cgn_fsid cgn_attr.va_fsid
#define cgn_nodeid cgn_attr.va_nodeid
#define cgn_nlink cgn_attr.va_nlink
#define cgn_size cgn_attr.va_size
#define cgn_atime cgn_attr.va_atime
#define cgn_mtime cgn_attr.va_mtime
#define cgn_ctime cgn_attr.va_ctime
#define cgn_rdev cgn_attr.va_rdev
#define cgn_blksize cgn_attr.va_blksize
#define cgn_nblocks cgn_attr.va_nblocks
#define cgn_seq cgn_attr.va_seq
/*
* cgroup directories are made up of a linked list of cg_dirent structures
* hanging off directory cgrp_nodes. File names are not fixed length,
* but are null terminated.
*/
typedef struct cgrp_dirent {
struct cgrp_node *cgd_cgrp_node; /* cg node for this file */
struct cgrp_dirent *cgd_next; /* next directory entry */
struct cgrp_dirent *cgd_prev; /* prev directory entry */
uint_t cgd_offset; /* "offset" of dir entry */
uint_t cgd_hash; /* a hash of cgd_name */
struct cgrp_dirent *cgd_link; /* linked via hash table */
struct cgrp_node *cgd_parent; /* parent, dir we are in */
char *cgd_name; /* null terminated */
} cgrp_dirent_t;
enum de_op { DE_CREATE, DE_MKDIR, DE_RENAME }; /* direnter ops */
enum dr_op { DR_REMOVE, DR_RMDIR, DR_RENAME }; /* dirremove ops */
extern struct vnodeops *cgrp_vnodeops;
int cgrp_dirdelete(cgrp_node_t *, cgrp_node_t *, char *, enum dr_op, cred_t *);
int cgrp_direnter(cgrp_mnt_t *, cgrp_node_t *, char *, enum de_op,
cgrp_node_t *, struct vattr *, cgrp_node_t **, cred_t *);
void cgrp_dirinit(cgrp_node_t *, cgrp_node_t *, cred_t *);
int cgrp_dirlookup(cgrp_node_t *, char *, cgrp_node_t **, cred_t *);
void cgrp_dirtrunc(cgrp_node_t *);
void cgrp_node_init(cgrp_mnt_t *, cgrp_node_t *, vattr_t *, cred_t *);
int cgrp_taccess(void *, int, cred_t *);
ino_t cgrp_inode(cgrp_nodetype_t, unsigned int);
int cgrp_num_pseudo_ents(cgrp_ssid_t);
cgrp_node_t *cgrp_cg_hash_lookup(cgrp_mnt_t *, uint_t);
void cgrp_rel_agent_event(cgrp_mnt_t *, cgrp_node_t *, boolean_t);
#endif /* KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _LXCGRPS_H */
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