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Diffstat (limited to 'usr/src/uts/common/sys/fs/tmp.h')
| -rw-r--r-- | usr/src/uts/common/sys/fs/tmp.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/fs/tmp.h b/usr/src/uts/common/sys/fs/tmp.h new file mode 100644 index 0000000000..583eaab18c --- /dev/null +++ b/usr/src/uts/common/sys/fs/tmp.h @@ -0,0 +1,122 @@ +/* + * 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 1989-1991, 1996-1999, 2001-2003 Sun Microsystems, Inc. + * All rights reserved. Use is subject to license terms. + */ + +#ifndef _SYS_FS_TMP_H +#define _SYS_FS_TMP_H + +#pragma ident "%Z%%M% %I% %E% SMI" + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * tmpfs per-mount data structure. + * + * All fields are protected by tm_contents. + * File renames on a particular file system are protected tm_renamelck. + */ +struct tmount { + struct vfs *tm_vfsp; /* filesystem's vfs struct */ + struct tmpnode *tm_rootnode; /* root tmpnode */ + char *tm_mntpath; /* name of tmpfs mount point */ + ulong_t tm_anonmax; /* file system max anon reservation */ + pgcnt_t tm_anonmem; /* pages of reserved anon memory */ + dev_t tm_dev; /* unique dev # of mounted `device' */ + uint_t tm_gen; /* pseudo generation number for files */ + kmutex_t tm_contents; /* lock for tmount structure */ + kmutex_t tm_renamelck; /* rename lock for this mount */ +}; + +/* + * File system independent to tmpfs conversion macros + */ +#define VFSTOTM(vfsp) ((struct tmount *)(vfsp)->vfs_data) +#define VTOTM(vp) ((struct tmount *)(vp)->v_vfsp->vfs_data) +#define VTOTN(vp) ((struct tmpnode *)(vp)->v_data) +#define TNTOV(tp) ((tp)->tn_vnode) +#define tmpnode_hold(tp) VN_HOLD(TNTOV(tp)) +#define tmpnode_rele(tp) VN_RELE(TNTOV(tp)) + +/* + * enums + */ +enum de_op { DE_CREATE, DE_MKDIR, DE_LINK, DE_RENAME }; /* direnter ops */ +enum dr_op { DR_REMOVE, DR_RMDIR, DR_RENAME }; /* dirremove ops */ + +/* + * tmpfs_minfree is the amount (in pages) of anonymous memory that tmpfs + * leaves free for the rest of the system. E.g. in a system with 32MB of + * configured swap space, if 16MB were reserved (leaving 16MB free), + * tmpfs could allocate up to 16MB - tmpfs_minfree. The default value + * for tmpfs_minfree is btopr(TMPMINFREE) but it can cautiously patched + * to a different number of pages. + * NB: If tmpfs allocates too much swap space, other processes will be + * unable to execute. + */ +#define TMPMINFREE 2 * 1024 * 1024 /* 2 Megabytes */ + +extern size_t tmpfs_minfree; /* Anonymous memory in pages */ + +/* + * tmpfs can allocate only a certain percentage of kernel memory, + * which is used for tmpnodes, directories, file names, etc. + * This is statically set as TMPMAXFRACKMEM of physical memory. + * The actual number of allocatable bytes can be patched in tmpfs_maxkmem. + */ +#define TMPMAXFRACKMEM 25 /* 1/25 of physical memory */ + +extern size_t tmp_kmemspace; +extern size_t tmpfs_maxkmem; /* Allocatable kernel memory in bytes */ + +extern void tmpnode_init(struct tmount *, struct tmpnode *, + struct vattr *, struct cred *); +extern int tmpnode_trunc(struct tmount *, struct tmpnode *, ulong_t); +extern void tmpnode_growmap(struct tmpnode *, ulong_t); +extern int tdirlookup(struct tmpnode *, char *, struct tmpnode **, + struct cred *); +extern int tdirdelete(struct tmpnode *, struct tmpnode *, char *, + enum dr_op, struct cred *); +extern void tdirinit(struct tmpnode *, struct tmpnode *); +extern void tdirtrunc(struct tmpnode *); +extern void *tmp_memalloc(size_t, int); +extern void tmp_memfree(void *, size_t); +extern int tmp_resv(struct tmount *, struct tmpnode *, size_t, int); +extern int tmp_taccess(void *, int, struct cred *); +extern int tmp_sticky_remove_access(struct tmpnode *, struct tmpnode *, + struct cred *); +extern int tmp_convnum(char *, pgcnt_t *); +extern int tdirenter(struct tmount *, struct tmpnode *, char *, + enum de_op, struct tmpnode *, struct tmpnode *, struct vattr *, + struct tmpnode **, struct cred *); + +#define TMP_MUSTHAVE 0x01 + +#ifdef __cplusplus +} +#endif + +#endif /* _SYS_FS_TMP_H */ |