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re #13613 rb4516 Tunables needs volatile keyword
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--- old/usr/src/uts/common/sys/fs/tmp.h
+++ new/usr/src/uts/common/sys/fs/tmp.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
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16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright 2007 Sun Microsystems, Inc.
23 23 * All rights reserved. Use is subject to license terms.
24 24 */
25 25 /*
26 + * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
26 27 * Copyright 2015 Joyent, Inc.
27 28 */
28 29
29 30 #ifndef _SYS_FS_TMP_H
30 31 #define _SYS_FS_TMP_H
31 32
32 33 #ifdef __cplusplus
33 34 extern "C" {
34 35 #endif
35 36
36 37 /*
37 38 * tmpfs per-mount data structure.
38 39 *
39 40 * All fields are protected by tm_contents.
40 41 * File renames on a particular file system are protected tm_renamelck.
41 42 */
42 43 struct tmount {
43 44 struct vfs *tm_vfsp; /* filesystem's vfs struct */
44 45 struct tmpnode *tm_rootnode; /* root tmpnode */
45 46 char *tm_mntpath; /* name of tmpfs mount point */
46 47 ulong_t tm_anonmax; /* file system max anon reservation */
47 48 pgcnt_t tm_anonmem; /* pages of reserved anon memory */
48 49 dev_t tm_dev; /* unique dev # of mounted `device' */
49 50 uint_t tm_gen; /* pseudo generation number for files */
50 51 kmutex_t tm_contents; /* lock for tmount structure */
51 52 kmutex_t tm_renamelck; /* rename lock for this mount */
52 53 };
53 54
54 55 /*
55 56 * File system independent to tmpfs conversion macros
56 57 */
57 58 #define VFSTOTM(vfsp) ((struct tmount *)(vfsp)->vfs_data)
58 59 #define VTOTM(vp) ((struct tmount *)(vp)->v_vfsp->vfs_data)
59 60 #define VTOTN(vp) ((struct tmpnode *)(vp)->v_data)
60 61 #define TNTOV(tp) ((tp)->tn_vnode)
61 62 #define tmpnode_hold(tp) VN_HOLD(TNTOV(tp))
62 63 #define tmpnode_rele(tp) VN_RELE(TNTOV(tp))
63 64
64 65 /*
65 66 * enums
66 67 */
67 68 enum de_op { DE_CREATE, DE_MKDIR, DE_LINK, DE_RENAME }; /* direnter ops */
68 69 enum dr_op { DR_REMOVE, DR_RMDIR, DR_RENAME }; /* dirremove ops */
69 70
70 71 /*
71 72 * tmpfs_minfree is the amount (in pages) of anonymous memory that tmpfs
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72 73 * leaves free for the rest of the system. E.g. in a system with 32MB of
73 74 * configured swap space, if 16MB were reserved (leaving 16MB free),
74 75 * tmpfs could allocate up to 16MB - tmpfs_minfree. The default value
75 76 * for tmpfs_minfree is btopr(TMPMINFREE) but it can cautiously patched
76 77 * to a different number of pages.
77 78 * NB: If tmpfs allocates too much swap space, other processes will be
78 79 * unable to execute.
79 80 */
80 81 #define TMPMINFREE 2 * 1024 * 1024 /* 2 Megabytes */
81 82
82 -extern size_t tmpfs_minfree; /* Anonymous memory in pages */
83 +extern volatile size_t tmpfs_minfree; /* Anonymous memory in pages */
83 84
84 85 /*
85 86 * tmpfs can allocate only a certain percentage of kernel memory,
86 87 * which is used for tmpnodes, directories, file names, etc.
87 88 * This is statically set as TMPMAXFRACKMEM of physical memory.
88 89 * The actual number of allocatable bytes can be patched in tmpfs_maxkmem.
89 90 */
90 91 #define TMPMAXFRACKMEM 25 /* 1/25 of physical memory */
91 92
92 93 extern size_t tmp_kmemspace;
93 -extern size_t tmpfs_maxkmem; /* Allocatable kernel memory in bytes */
94 +extern volatile size_t tmpfs_maxkmem; /* Allocatable kernel memory in bytes */
94 95
95 96 extern void tmpnode_init(struct tmount *, struct tmpnode *,
96 97 struct vattr *, struct cred *);
97 98 extern int tmpnode_trunc(struct tmount *, struct tmpnode *, ulong_t);
98 99 extern void tmpnode_growmap(struct tmpnode *, ulong_t);
99 100 extern int tdirlookup(struct tmpnode *, char *, struct tmpnode **,
100 101 struct cred *);
101 102 extern int tdirdelete(struct tmpnode *, struct tmpnode *, char *,
102 103 enum dr_op, struct cred *);
103 104 extern void tdirinit(struct tmpnode *, struct tmpnode *);
104 105 extern void tdirtrunc(struct tmpnode *);
105 106 extern void *tmp_memalloc(size_t, int);
106 107 extern void tmp_memfree(void *, size_t);
107 108 extern int tmp_resv(struct tmount *, struct tmpnode *, size_t, int);
108 109 extern int tmp_taccess(void *, int, struct cred *);
109 110 extern int tmp_sticky_remove_access(struct tmpnode *, struct tmpnode *,
110 111 struct cred *);
111 112 extern int tmp_convnum(char *, pgcnt_t *);
112 113 extern int tmp_convmode(char *, mode_t *);
113 114 extern int tdirenter(struct tmount *, struct tmpnode *, char *,
114 115 enum de_op, struct tmpnode *, struct tmpnode *, struct vattr *,
115 116 struct tmpnode **, struct cred *, caller_context_t *);
116 117
117 118 #define TMP_MUSTHAVE 0x01
118 119
119 120 #ifdef __cplusplus
120 121 }
121 122 #endif
122 123
123 124 #endif /* _SYS_FS_TMP_H */
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