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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 2016 Joyent, Inc.
26 + * Copyright 2015 Joyent, Inc.
27 27 */
28 28
29 29 #ifndef _SYS_FS_TMP_H
30 30 #define _SYS_FS_TMP_H
31 31
32 32 #ifdef __cplusplus
33 33 extern "C" {
34 34 #endif
35 35
36 36 /*
37 37 * tmpfs per-mount data structure.
38 38 *
39 39 * All fields are protected by tm_contents.
40 40 * File renames on a particular file system are protected tm_renamelck.
41 41 */
42 42 struct tmount {
43 43 struct vfs *tm_vfsp; /* filesystem's vfs struct */
44 44 struct tmpnode *tm_rootnode; /* root tmpnode */
45 45 char *tm_mntpath; /* name of tmpfs mount point */
46 - size_t tm_anonmax; /* file system max anon reservation */
47 - size_t tm_anonmem; /* bytes of reserved anon memory */
48 - /* and allocated kmem for the fs */
49 - size_t tm_allocmem; /* bytes alloced from tmp_kmem_ funcs */
46 + ulong_t tm_anonmax; /* file system max anon reservation */
47 + pgcnt_t tm_anonmem; /* pages of reserved anon memory */
50 48 dev_t tm_dev; /* unique dev # of mounted `device' */
51 49 uint_t tm_gen; /* pseudo generation number for files */
52 50 kmutex_t tm_contents; /* lock for tmount structure */
53 51 kmutex_t tm_renamelck; /* rename lock for this mount */
54 52 };
55 53
56 54 /*
57 55 * File system independent to tmpfs conversion macros
58 56 */
59 57 #define VFSTOTM(vfsp) ((struct tmount *)(vfsp)->vfs_data)
60 58 #define VTOTM(vp) ((struct tmount *)(vp)->v_vfsp->vfs_data)
61 59 #define VTOTN(vp) ((struct tmpnode *)(vp)->v_data)
62 60 #define TNTOV(tp) ((tp)->tn_vnode)
63 -#define TNTOTM(tp) (VTOTM(TNTOV(tp)))
64 61 #define tmpnode_hold(tp) VN_HOLD(TNTOV(tp))
65 62 #define tmpnode_rele(tp) VN_RELE(TNTOV(tp))
66 63
67 64 /*
68 65 * enums
69 66 */
70 67 enum de_op { DE_CREATE, DE_MKDIR, DE_LINK, DE_RENAME }; /* direnter ops */
71 68 enum dr_op { DR_REMOVE, DR_RMDIR, DR_RENAME }; /* dirremove ops */
72 69
73 70 /*
74 71 * tmpfs_minfree is the amount (in pages) of anonymous memory that tmpfs
75 - * leaves free for the rest of the system. In antiquity, this number could be
76 - * relevant on a system-wide basis, as physical DRAM was routinely exhausted;
77 - * however, in more modern times, the relative growth of DRAM with respect to
78 - * application footprint means that this number is only likely to become
79 - * factor in a virtualized OS environment (e.g., a zone) -- and even then only
80 - * when DRAM and swap have both been capped low to allow for maximum tenancy.
81 - * TMPMINFREE -- the value from which tmpfs_minfree is derived -- should
82 - * therefore be configured to a value that is roughly the smallest practical
83 - * value for memory + swap minus the largest reasonable size for tmpfs in such
84 - * a configuration. As of this writing, the smallest practical memory + swap
85 - * configuration is 128MB, and it seems reasonable to allow tmpfs to consume
86 - * no more than seven-eighths of this, yielding a TMPMINFREE of 16MB. Care
87 - * should be exercised in changing this: tuning this value too high will
88 - * result in spurious ENOSPC errors in tmpfs in small zones (a problem that
89 - * can induce cascading failure surprisingly often); tuning this value too low
90 - * will result in tmpfs consumption alone to alone induce application-level
91 - * memory allocation failure.
72 + * leaves free for the rest of the system. E.g. in a system with 32MB of
73 + * configured swap space, if 16MB were reserved (leaving 16MB free),
74 + * tmpfs could allocate up to 16MB - tmpfs_minfree. The default value
75 + * for tmpfs_minfree is btopr(TMPMINFREE) but it can cautiously patched
76 + * to a different number of pages.
77 + * NB: If tmpfs allocates too much swap space, other processes will be
78 + * unable to execute.
92 79 */
93 -#define TMPMINFREE 16 * 1024 * 1024 /* 16 Megabytes */
80 +#define TMPMINFREE 2 * 1024 * 1024 /* 2 Megabytes */
94 81
95 82 extern size_t tmpfs_minfree; /* Anonymous memory in pages */
96 83
84 +/*
85 + * tmpfs can allocate only a certain percentage of kernel memory,
86 + * which is used for tmpnodes, directories, file names, etc.
87 + * This is statically set as TMPMAXFRACKMEM of physical memory.
88 + * The actual number of allocatable bytes can be patched in tmpfs_maxkmem.
89 + */
90 +#define TMPMAXFRACKMEM 25 /* 1/25 of physical memory */
91 +
92 +extern size_t tmp_kmemspace;
93 +extern size_t tmpfs_maxkmem; /* Allocatable kernel memory in bytes */
94 +
97 95 extern void tmpnode_init(struct tmount *, struct tmpnode *,
98 96 struct vattr *, struct cred *);
99 -extern void tmpnode_cleanup(struct tmpnode *tp);
100 97 extern int tmpnode_trunc(struct tmount *, struct tmpnode *, ulong_t);
101 98 extern void tmpnode_growmap(struct tmpnode *, ulong_t);
102 99 extern int tdirlookup(struct tmpnode *, char *, struct tmpnode **,
103 100 struct cred *);
104 101 extern int tdirdelete(struct tmpnode *, struct tmpnode *, char *,
105 102 enum dr_op, struct cred *);
106 -extern int tdirinit(struct tmpnode *, struct tmpnode *);
103 +extern void tdirinit(struct tmpnode *, struct tmpnode *);
107 104 extern void tdirtrunc(struct tmpnode *);
105 +extern void *tmp_memalloc(size_t, int);
106 +extern void tmp_memfree(void *, size_t);
108 107 extern int tmp_resv(struct tmount *, struct tmpnode *, size_t, int);
109 108 extern int tmp_taccess(void *, int, struct cred *);
110 109 extern int tmp_sticky_remove_access(struct tmpnode *, struct tmpnode *,
111 110 struct cred *);
112 -extern int tmp_convnum(char *, size_t *);
111 +extern int tmp_convnum(char *, pgcnt_t *);
113 112 extern int tmp_convmode(char *, mode_t *);
114 113 extern int tdirenter(struct tmount *, struct tmpnode *, char *,
115 114 enum de_op, struct tmpnode *, struct tmpnode *, struct vattr *,
116 115 struct tmpnode **, struct cred *, caller_context_t *);
117 116
118 -extern void *tmp_kmem_zalloc(struct tmount *, size_t, int);
119 -extern void tmp_kmem_free(struct tmount *, void *, size_t);
120 -
121 117 #define TMP_MUSTHAVE 0x01
122 118
123 119 #ifdef __cplusplus
124 120 }
125 121 #endif
126 122
127 123 #endif /* _SYS_FS_TMP_H */
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