diff options
Diffstat (limited to 'usr/src/uts/common/sys/fs/hyprlofs_info.h')
| -rw-r--r-- | usr/src/uts/common/sys/fs/hyprlofs_info.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/fs/hyprlofs_info.h b/usr/src/uts/common/sys/fs/hyprlofs_info.h new file mode 100644 index 0000000000..38389f77d9 --- /dev/null +++ b/usr/src/uts/common/sys/fs/hyprlofs_info.h @@ -0,0 +1,174 @@ +/* + * 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 */ |