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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2012, Joyent, Inc. All rights reserved.
*/
#ifndef _SYS_FS_HYPRLOFS_INFO_H
#define _SYS_FS_HYPRLOFS_INFO_H
#include <sys/t_lock.h>
#include <vm/seg.h>
#include <vm/seg_vn.h>
#include <sys/vfs_opreg.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* hlnode is the file system dependent node for hyprlofs.
* It is modeled on the tmpfs tmpnode.
*
* hln_rwlock protects access of the directory list at hln_dir
* as well as syncronizing read/writes to directory hlnodes.
* hln_tlock protects updates to hln_mode and hln_nlink.
* hln_tlock doesn't require any hlnode locks.
*/
typedef struct hlnode {
struct hlnode *hln_back; /* linked list of hlnodes */
struct hlnode *hln_forw; /* linked list of hlnodes */
union {
struct {
struct hldirent *un_dirlist; /* dirent list */
uint_t un_dirents; /* number of dirents */
} un_dirstruct;
vnode_t *un_realvp; /* real vnode */
} un_hlnode;
vnode_t *hln_vnode; /* vnode for this hlnode */
int hln_gen; /* pseudo gen num for hlfid */
int hln_looped; /* flag indicating loopback */
vattr_t hln_attr; /* attributes */
krwlock_t hln_rwlock; /* rw - serialize mods and */
/* directory updates */
kmutex_t hln_tlock; /* time, flag, and nlink lock */
} hlnode_t;
/*
* hyprlofs per-mount data structure.
* All fields are protected by hlm_contents.
*/
typedef struct {
vfs_t *hlm_vfsp; /* filesystem's vfs struct */
hlnode_t *hlm_rootnode; /* root hlnode */
char *hlm_mntpath; /* name of hyprlofs mount point */
dev_t hlm_dev; /* unique dev # of mounted `device' */
uint_t hlm_gen; /* pseudo generation number for files */
kmutex_t hlm_contents; /* lock for hlfsmount structure */
} hlfsmount_t;
/*
* hyprlofs directories are made up of a linked list of hldirent structures
* hanging off directory hlnodes. File names are not fixed length,
* but are null terminated.
*/
typedef struct hldirent {
hlnode_t *hld_hlnode; /* hlnode for this file */
struct hldirent *hld_next; /* next directory entry */
struct hldirent *hld_prev; /* prev directory entry */
uint_t hld_offset; /* "offset" of dir entry */
uint_t hld_hash; /* a hash of td_name */
struct hldirent *hld_link; /* linked via the hash table */
hlnode_t *hld_parent; /* parent, dir we are in */
char *hld_name; /* must be null terminated */
/* max length is MAXNAMELEN */
} hldirent_t;
/*
* hlfid overlays the fid structure (for VFS_VGET)
*/
typedef struct {
uint16_t hlfid_len;
ino32_t hlfid_ino;
int32_t hlfid_gen;
} hlfid_t;
/*
* File system independent to hyprlofs conversion macros
*/
#define VFSTOHLM(vfsp) ((hlfsmount_t *)(vfsp)->vfs_data)
#define VTOHLM(vp) ((hlfsmount_t *)(vp)->v_vfsp->vfs_data)
#define VTOHLN(vp) ((hlnode_t *)(vp)->v_data)
#define HLNTOV(tp) ((tp)->hln_vnode)
#define REALVP(vp) ((vnode_t *)VTOHLN(vp)->hln_realvp)
#define hlnode_hold(tp) VN_HOLD(HLNTOV(tp))
#define hlnode_rele(tp) VN_RELE(HLNTOV(tp))
#define hln_dir un_hlnode.un_dirstruct.un_dirlist
#define hln_dirents un_hlnode.un_dirstruct.un_dirents
#define hln_realvp un_hlnode.un_realvp
/*
* Attributes
*/
#define hln_mask hln_attr.va_mask
#define hln_type hln_attr.va_type
#define hln_mode hln_attr.va_mode
#define hln_uid hln_attr.va_uid
#define hln_gid hln_attr.va_gid
#define hln_fsid hln_attr.va_fsid
#define hln_nodeid hln_attr.va_nodeid
#define hln_nlink hln_attr.va_nlink
#define hln_size hln_attr.va_size
#define hln_atime hln_attr.va_atime
#define hln_mtime hln_attr.va_mtime
#define hln_ctime hln_attr.va_ctime
#define hln_rdev hln_attr.va_rdev
#define hln_blksize hln_attr.va_blksize
#define hln_nblocks hln_attr.va_nblocks
#define hln_seq hln_attr.va_seq
/*
* enums
*/
enum de_op { DE_CREATE, DE_MKDIR }; /* direnter ops */
enum dr_op { DR_REMOVE, DR_RMDIR }; /* dirremove ops */
/*
* hyprlofs_minfree is the amount (in pages) of anonymous memory that hyprlofs
* leaves free for the rest of the system. The default value for
* hyprlofs_minfree is btopr(HYPRLOFSMINFREE) but it can be patched to a
* different number of pages. Since hyprlofs doesn't actually use much
* memory, its unlikely this ever needs to be patched.
*/
#define HYPRLOFSMINFREE 8 * 1024 * 1024 /* 8 Megabytes */
extern size_t hyprlofs_minfree; /* Anonymous memory in pages */
extern void hyprlofs_node_init(hlfsmount_t *, hlnode_t *, vattr_t *,
cred_t *);
extern int hyprlofs_dirlookup(hlnode_t *, char *, hlnode_t **, cred_t *);
extern int hyprlofs_dirdelete(hlnode_t *, hlnode_t *, char *, enum dr_op,
cred_t *);
extern void hyprlofs_dirinit(hlnode_t *, hlnode_t *);
extern void hyprlofs_dirtrunc(hlnode_t *);
extern int hyprlofs_taccess(void *, int, cred_t *);
extern int hyprlofs_direnter(hlfsmount_t *, hlnode_t *, char *, enum de_op,
vnode_t *, vattr_t *, hlnode_t **, cred_t *);
extern struct vnodeops *hyprlofs_vnodeops;
extern const struct fs_operation_def hyprlofs_vnodeops_template[];
#ifdef __cplusplus
}
#endif
#endif /* _SYS_FS_HYPRLOFS_INFO_H */
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