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Commit | Line | Data |
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6231b320 | 1 | $afsbin="/moira/bin"; |
2 | $vos="$afsbin/vos"; | |
3 | $pts="$afsbin/pts"; | |
4 | $fs="$afsbin/fs"; | |
5 | ||
c09dcc8c | 6 | $afs_data="/moira/afs/afs_data"; |
6231b320 | 7 | $afs_save="$afs_data.tmp"; |
8 | ||
9 | $LOCK_EX=2; | |
10 | $LOCK_UN=8; | |
11 | ||
12 | # File format: | |
13 | # cell server partition total used alloc | |
14 | ||
15 | # Locking/re-write algorithm: | |
16 | # 1. Open the data file. | |
17 | # 2. Obtain a lock on the data file. | |
18 | # 3. Check for the existence of a temporary data file - die if it exists. | |
19 | # 4. Save current contents into temporary data file. | |
20 | # 5. Re-write output (with line-buffering). | |
21 | # 6. Unlink temporary file. | |
22 | # 7. Unlock data file. | |
23 | # 8. Close the data file. | |
24 | ||
25 | ||
26 | sub afs_lock | |
27 | { | |
28 | open(SRV,"+<$afs_data") || die "Unable to open $afs_data\n"; | |
29 | select((select(SRV), $|=1)[$[]); | |
30 | flock(SRV, $LOCK_EX) || die "Unable to lock $afs_data\n"; | |
f00e5df1 | 31 | die "Temporary status file: $afs_save exists... aborting\n" |
6231b320 | 32 | if (-f $afs_save); |
33 | open(SRV2, ">$afs_save"); | |
34 | @afs_data = <SRV>; | |
35 | print SRV2 @afs_data; | |
36 | close(SRV2); | |
37 | seek(SRV, 0, 0); | |
38 | } | |
39 | ||
40 | sub afs_unlock | |
41 | { | |
42 | unlink($afs_save); | |
43 | close(SRV); | |
44 | } | |
45 | ||
46 | # Find server/partition for allocation. | |
47 | # | |
48 | # Best fit algorithm used: | |
49 | # max[ (2*free space) - (unused quota) ] | |
50 | # = max(2*total - usage - alloc) | |
51 | # | |
52 | # Note: This routine does not actually adjust the quota; the caller | |
53 | # should use afs_quota_adj(); | |
54 | ||
55 | sub afs_find | |
56 | { | |
57 | local($cell,$type,$quota) = @_; | |
58 | local($j); | |
5abfab4b | 59 | local(@max) = ''; |
6231b320 | 60 | |
61 | &afs_lock; | |
62 | chop(@afs_data); | |
63 | ||
64 | for (@afs_data) { | |
65 | local ($a, $asrv, $apart, $t, $total, $used, $alloc) = split(/\s+/,$_); | |
66 | next if ($a ne $cell || !$total || $type !~ /$t/); | |
f00e5df1 | 67 | $alloc = $used if ($alloc < $used); |
6231b320 | 68 | $j = 2*$total - $used - $alloc; |
69 | @max = ($asrv,$apart,$j) if (! @max || $j > $max[2]); | |
70 | } | |
71 | ||
6231b320 | 72 | &afs_unlock; |
73 | return(@max); | |
74 | } | |
75 | ||
76 | # | |
77 | # Quota adjustments | |
78 | # | |
79 | sub afs_quota_adj | |
80 | { | |
81 | local($cell,$asrv,$apart,$adj) = @_; | |
5abfab4b | 82 | local($found) = 0; |
6231b320 | 83 | |
84 | &afs_lock; | |
85 | chop(@afs_data); | |
86 | truncate(SRV, 0); | |
87 | for (@afs_data) { | |
88 | local ($c, $as, $ap, $t, $total, $used, $alloc) = split(/\s+/,$_); | |
89 | if ($c eq $cell && $as eq $asrv && $ap eq $apart) { | |
90 | $alloc += $adj; | |
91 | $_ = join(' ',$c,$asrv,$apart,$t,$total,$used,$alloc); | |
5abfab4b | 92 | $found = 1; |
6231b320 | 93 | } |
94 | print SRV "$_\n"; | |
95 | } | |
96 | &afs_unlock; | |
5abfab4b | 97 | return($found); |
6231b320 | 98 | } |