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Diffstat (limited to 'usr/src/uts/common/sys/fs/tmpnode.h')
| -rw-r--r-- | usr/src/uts/common/sys/fs/tmpnode.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/fs/tmpnode.h b/usr/src/uts/common/sys/fs/tmpnode.h new file mode 100644 index 0000000000..084b8e181b --- /dev/null +++ b/usr/src/uts/common/sys/fs/tmpnode.h @@ -0,0 +1,160 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (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 2004 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef _SYS_FS_TMPNODE_H +#define _SYS_FS_TMPNODE_H + +#pragma ident "%Z%%M% %I% %E% SMI" + +#include <sys/t_lock.h> +#include <vm/seg.h> +#include <vm/seg_vn.h> + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * tmpnode is the file system dependent node for tmpfs. + * + * tn_rwlock protects access of the directory list at tn_dir + * as well as syncronizing read and writes to the tmpnode + * + * tn_contents protects growing, shrinking, reading and writing + * the file along with tn_rwlock (see below). + * + * tn_tlock protects updates to tn_mode and tn_nlink + * + * tm_contents in the tmount filesystem data structure protects + * tn_forw and tn_back which are used to maintain a linked + * list of all tmpfs files associated with that file system + * + * The anon array represents the secondary store for tmpfs. + * To grow or shrink the file or fill in holes requires + * manipulation of the anon array. These operations are protected + * by a combination of tn_rwlock and tn_contents. Growing or shrinking + * the array requires the write lock on tn_rwlock and tn_contents. + * Filling in a slot in the array requires the write lock on tn_contents. + * Reading the array requires the read lock on tn_contents. + * + * The ordering of the locking is: + * tn_rwlock -> tn_contents -> page locks on pages in file + * + * tn_tlock doesn't require any tmpnode locks + */ + +struct tmpnode { + struct tmpnode *tn_back; /* linked list of tmpnodes */ + struct tmpnode *tn_forw; /* linked list of tmpnodes */ + union { + struct { + struct tdirent *un_dirlist; /* dirent list */ + uint_t un_dirents; /* number of dirents */ + } un_dirstruct; + char *un_symlink; /* pointer to symlink */ + struct { + struct anon_hdr *un_anon; /* anon backing for file */ + pgcnt_t un_size; /* size repres. by array */ + } un_anonstruct; + } un_tmpnode; + struct vnode *tn_vnode; /* vnode for this tmpnode */ + int tn_gen; /* pseudo gen number for tfid */ + struct vattr tn_attr; /* attributes */ + krwlock_t tn_contents; /* vm side -serialize mods */ + krwlock_t tn_rwlock; /* rw,trunc size - serialize */ + /* mods and directory updates */ + kmutex_t tn_tlock; /* time, flag, and nlink lock */ + struct tmpnode *tn_xattrdp; /* ext. attribute directory */ + uint_t tn_flags; /* tmpnode specific flags */ +}; + +#define tn_dir un_tmpnode.un_dirstruct.un_dirlist +#define tn_dirents un_tmpnode.un_dirstruct.un_dirents +#define tn_symlink un_tmpnode.un_symlink +#define tn_anon un_tmpnode.un_anonstruct.un_anon +#define tn_asize un_tmpnode.un_anonstruct.un_size + +/* + * tmnode flag values. + */ +#define ISXATTR 0x1 + +/* + * Attributes + */ +#define tn_mask tn_attr.va_mask +#define tn_type tn_attr.va_type +#define tn_mode tn_attr.va_mode +#define tn_uid tn_attr.va_uid +#define tn_gid tn_attr.va_gid +#define tn_fsid tn_attr.va_fsid +#define tn_nodeid tn_attr.va_nodeid +#define tn_nlink tn_attr.va_nlink +#define tn_size tn_attr.va_size +#define tn_atime tn_attr.va_atime +#define tn_mtime tn_attr.va_mtime +#define tn_ctime tn_attr.va_ctime +#define tn_rdev tn_attr.va_rdev +#define tn_blksize tn_attr.va_blksize +#define tn_nblocks tn_attr.va_nblocks +#define tn_seq tn_attr.va_seq + +/* + * tmpfs directories are made up of a linked list of tdirent structures + * hanging off directory tmpnodes. File names are not fixed length, + * but are null terminated. + */ +struct tdirent { + struct tmpnode *td_tmpnode; /* tnode for this file */ + struct tdirent *td_next; /* next directory entry */ + struct tdirent *td_prev; /* prev directory entry */ + uint_t td_offset; /* "offset" of dir entry */ + uint_t td_hash; /* a hash of td_name */ + struct tdirent *td_link; /* linked via the hash table */ + struct tmpnode *td_parent; /* parent, dir we are in */ + char *td_name; /* must be null terminated */ + /* max length is MAXNAMELEN */ +}; + +/* + * tfid overlays the fid structure (for VFS_VGET) + */ +struct tfid { + uint16_t tfid_len; + ino32_t tfid_ino; + int32_t tfid_gen; +}; + +#define ESAME (-1) /* trying to rename linked files (special) */ + +extern struct vnodeops *tmp_vnodeops; +extern const struct fs_operation_def tmp_vnodeops_template[]; + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_FS_TMPNODE_H */ |