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1 | /* | |
2 | * mdadm - manage Linux "md" devices aka RAID arrays. | |
3 | * | |
4 | * Copyright (C) 2001-2009 Neil Brown <neilb@suse.de> | |
5 | * | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | * Author: Neil Brown | |
22 | * Email: <neilb@suse.de> | |
23 | * | |
24 | * Added by Dale Stephenson | |
25 | * steph@snapserver.com | |
26 | */ | |
27 | ||
28 | #include "mdadm.h" | |
29 | #include "md_u.h" | |
30 | #include "md_p.h" | |
31 | ||
32 | int Kill(char *dev, struct supertype *st, int force, int verbose, int noexcl) | |
33 | { | |
34 | /* | |
35 | * Nothing fancy about Kill. It just zeroes out a superblock | |
36 | * Definitely not safe. | |
37 | * Returns: | |
38 | * 0 - a zero superblock was successfully written out | |
39 | * 1 - failed to write the zero superblock | |
40 | * 2 - failed to open the device or find a superblock. | |
41 | */ | |
42 | ||
43 | int fd, rv = 0; | |
44 | ||
45 | if (force) | |
46 | noexcl = 1; | |
47 | fd = open(dev, O_RDWR|(noexcl ? 0 : O_EXCL)); | |
48 | if (fd < 0) { | |
49 | if (verbose >= 0) | |
50 | pr_err("Couldn't open %s for write - not zeroing\n", | |
51 | dev); | |
52 | return 2; | |
53 | } | |
54 | if (st == NULL) | |
55 | st = guess_super(fd); | |
56 | if (st == NULL || st->ss->init_super == NULL) { | |
57 | if (verbose >= 0) | |
58 | pr_err("Unrecognised md component device - %s\n", dev); | |
59 | close(fd); | |
60 | return 2; | |
61 | } | |
62 | st->ignore_hw_compat = 1; | |
63 | rv = st->ss->load_super(st, fd, dev); | |
64 | if (rv == 0 || (force && rv >= 2)) { | |
65 | st->ss->free_super(st); | |
66 | st->ss->init_super(st, NULL, NULL, "", NULL, NULL, | |
67 | INVALID_SECTORS); | |
68 | if (st->ss->store_super(st, fd)) { | |
69 | if (verbose >= 0) | |
70 | pr_err("Could not zero superblock on %s\n", | |
71 | dev); | |
72 | rv = 1; | |
73 | } else if (rv) { | |
74 | if (verbose >= 0) | |
75 | pr_err("superblock zeroed anyway\n"); | |
76 | rv = 0; | |
77 | } | |
78 | } | |
79 | close(fd); | |
80 | return rv; | |
81 | } | |
82 | ||
83 | int Kill_subarray(char *dev, char *subarray, int verbose) | |
84 | { | |
85 | /* Delete a subarray out of a container, the subarry must be | |
86 | * inactive. The subarray string must be a subarray index | |
87 | * number. | |
88 | * | |
89 | * 0 = successfully deleted subarray from all container members | |
90 | * 1 = failed to sync metadata to one or more devices | |
91 | * 2 = failed to find the container, subarray, or other resource | |
92 | * issue | |
93 | */ | |
94 | struct supertype supertype, *st = &supertype; | |
95 | int fd, rv = 2; | |
96 | ||
97 | memset(st, 0, sizeof(*st)); | |
98 | ||
99 | fd = open_subarray(dev, subarray, st, verbose < 0); | |
100 | if (fd < 0) | |
101 | return 2; | |
102 | ||
103 | if (!st->ss->kill_subarray) { | |
104 | if (verbose >= 0) | |
105 | pr_err("Operation not supported for %s metadata\n", | |
106 | st->ss->name); | |
107 | goto free_super; | |
108 | } | |
109 | ||
110 | if (is_subarray_active(subarray, st->devnm)) { | |
111 | if (verbose >= 0) | |
112 | pr_err("Subarray-%s still active, aborting\n", | |
113 | subarray); | |
114 | goto free_super; | |
115 | } | |
116 | ||
117 | if (mdmon_running(st->devnm)) | |
118 | st->update_tail = &st->updates; | |
119 | ||
120 | /* ok we've found our victim, drop the axe */ | |
121 | rv = st->ss->kill_subarray(st); | |
122 | if (rv) { | |
123 | if (verbose >= 0) | |
124 | pr_err("Failed to delete subarray-%s from %s\n", | |
125 | subarray, dev); | |
126 | goto free_super; | |
127 | } | |
128 | ||
129 | /* FIXME these routines do not report success/failure */ | |
130 | if (st->update_tail) | |
131 | flush_metadata_updates(st); | |
132 | else | |
133 | st->ss->sync_metadata(st); | |
134 | ||
135 | if (verbose >= 0) | |
136 | pr_err("Deleted subarray-%s from %s, UUIDs may have changed\n", | |
137 | subarray, dev); | |
138 | ||
139 | rv = 0; | |
140 | ||
141 | free_super: | |
142 | st->ss->free_super(st); | |
143 | close(fd); | |
144 | ||
145 | return rv; | |
146 | } |