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f937adac NS |
1 | /* |
2 | * Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of version 2 of the GNU General Public License as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it would be useful, but | |
9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
11 | * | |
12 | * Further, this software is distributed without any warranty that it is | |
13 | * free of the rightful claim of any third person regarding infringement | |
14 | * or the like. Any license provided herein, whether implied or | |
15 | * otherwise, applies only to this software file. Patent licenses, if | |
16 | * any, provided herein do not apply to combinations of this program with | |
17 | * other software, or any other product whatsoever. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License along | |
20 | * with this program; if not, write the Free Software Foundation, Inc., 59 | |
21 | * Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
22 | * | |
23 | * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, | |
24 | * Mountain View, CA 94043, or: | |
25 | * | |
26 | * http://www.sgi.com | |
27 | * | |
28 | * For further information regarding this notice, see: | |
29 | * | |
30 | * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ | |
31 | */ | |
32 | ||
33 | #include <stdio.h> | |
34 | #include <fcntl.h> | |
35 | #include <unistd.h> | |
36 | #include <sys/stat.h> | |
37 | #include <sys/ioctl.h> | |
38 | #include <volume.h> | |
39 | #include "xvm.h" | |
40 | ||
d5dca43b | 41 | int |
f937adac NS |
42 | mnt_is_xvm_subvol(dev_t dev) |
43 | { | |
d5dca43b NS |
44 | if (major(dev) == get_driver_block_major("xvm")) |
45 | return 1; | |
f937adac NS |
46 | return 0; |
47 | } | |
48 | ||
49 | /* | |
50 | * If the logical device is a xvm striped volume, then it returns the | |
51 | * stripe unit and stripe width information. | |
52 | * Input parameters: the logical volume | |
53 | * the subvolume type - (SVTYPE_RT or | |
54 | * SVTYPE_DATA) | |
55 | * Output parameters: the stripe unit and width in 512 byte blocks | |
56 | * true/false - was this device an XVM volume? | |
57 | */ | |
58 | int | |
59 | xvm_get_subvol_stripe( | |
60 | char *dev, | |
61 | sv_type_t type, | |
62 | int *sunit, | |
63 | int *swidth, | |
64 | struct stat64 *sb) | |
65 | { | |
d5dca43b NS |
66 | int fd; |
67 | xvm_getdev_t getdev; | |
68 | xvm_subvol_stripe_t subvol_stripe; | |
69 | ||
70 | if (!mnt_is_xvm_subvol(sb->st_rdev)) | |
8e9bef16 NS |
71 | return 0; |
72 | ||
d5dca43b NS |
73 | /* |
74 | * This will actually open the data subvolume. | |
75 | */ | |
76 | if ((fd = open(dev, O_RDONLY)) < 0) | |
77 | return 0; | |
8e9bef16 | 78 | |
d5dca43b NS |
79 | /* |
80 | * Go and get the the information for the correct | |
81 | * subvolume. | |
82 | */ | |
83 | if (ioctl(fd, DIOCGETVOLDEV, &getdev) < 0) { | |
84 | close(fd); | |
85 | return 0; | |
86 | } | |
87 | if ( (type == SVTYPE_RT) && (getdev.rt_subvol_dev) ) | |
88 | subvol_stripe.dev = getdev.rt_subvol_dev; | |
89 | else if ( (type == SVTYPE_DATA) && (getdev.data_subvol_dev) ) | |
90 | subvol_stripe.dev = getdev.data_subvol_dev; | |
91 | else { | |
92 | close(fd); | |
93 | return 0; | |
94 | } | |
95 | ||
96 | if (ioctl(fd, DIOCGETVOLSTRIPE, &subvol_stripe) < 0) { | |
97 | close(fd); | |
98 | return 0; | |
99 | } | |
100 | ||
101 | *sunit = subvol_stripe.unit_size; | |
102 | *swidth = *sunit * subvol_stripe.width_size; | |
103 | close(fd); | |
104 | return 1; | |
f937adac | 105 | } |