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xen 4.1 blktap

SNIPPET_TEXT:

1. #!/bin/bash
2.  
3. # Copyright (c) 2005, XenSource Ltd.
4.  
5. dir=$(dirname "$0")
6. . "$dir/xen-hotplug-common.sh"
7. . "$dir/block-common.sh"
8.  
9. findCommand "$@"
10.  
11. ##
12. # check_blktap_sharing file mode
13. #
14. # Perform the sharing check for the given blktap and mode.
15. #
16. check_blktap_sharing()
17. {
18.     local file="$1"
19.     local mode="$2"
20.  
21.     local base_path="$XENBUS_BASE_PATH/$XENBUS_TYPE"
22.     for dom in $(xenstore-list "$base_path")
23.     do
24.         for dev in $(xenstore-list "$base_path/$dom")
25.         do
26.             params=$(xenstore_read_default "$base_path/$dom/$dev/params" "" | cut -d: -f2)
27.             if [ "$file" = "$params" ]
28.             then
29.  
30.                 if [ "$mode" = 'w' ]
31.                 then
32.                     if ! same_vm "$dom"
33.                     then
34.                         echo 'guest'
35.                         return
36.                     fi
37.                 else
38.                     local m=$(xenstore_read_default "$base_path/$dom/$dev/mode" "")
39.                     m=$(canonicalise_mode "$m")
40.  
41.                     if [ "$m" = 'w' ]
42.                     then
43.                         if ! same_vm "$dom"
44.                         then
45.                             echo 'guest'
46.                             return
47.                         fi
48.                     fi
49.                 fi
50.             fi
51.         done
52.     done
53.     echo 'ok'
54. }
55.  
56.  
57. t=$(xenstore_read_default "$XENBUS_PATH/type" 'MISSING')
58. if [ -n "$t" ]
59. then
60.     p=$(xenstore_read "$XENBUS_PATH/params")
61.     p=${p#tapdisk:}
62.     # if we have a ':', chew from head including :
63.     if echo $p | grep -q \:
64.     then
65.         p=${p#*:}
66.     fi
67. fi
68. # some versions of readlink cannot be passed a regular file
69. if [ -L "$p" ]; then
70.     file=$(readlink -f "$p") || fatal "$p link does not exist."
71. else
72.     file="$p"
73. fi
74.  
75. if [ "$command" = 'add' ]
76. then
77.     [ -e "$file" ] || { fatal $file does not exist; }
78.  
79.     FRONTEND_ID=$(xenstore_read "$XENBUS_PATH/frontend-id")
80.     FRONTEND_UUID=$(xenstore_read "/local/domain/$FRONTEND_ID/vm")
81.     mode=$(xenstore_read "$XENBUS_PATH/mode")
82.     mode=$(canonicalise_mode "$mode")
83.  
84.     if [ "$mode" != '!' ]
85.     then
86.         result=$(check_blktap_sharing "$file" "$mode")
87.         [ "$result" = 'ok' ] || ebusy "$file already in use by other domain"
88.     fi
89.  
90.     success
91. fi
92.  
93. exit 0

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