cmd/zvol_wait

   1 #!/bin/sh
   2
   3 count_zvols() {
   4         if [ -z "$zvols" ]; then
   5                 echo 0
   6         else
   7                 echo "$zvols" | wc -l
   8         fi
   9 }
  10
  11 filter_out_zvols_with_links() {
  12         echo "$zvols" | tr ' ' '+' | while read -r zvol; do
  13                 if ! [ -L "/dev/zvol/$zvol" ]; then
  14                         echo "$zvol"
  15                 fi
  16         done | tr '+' ' '
  17 }
  18
  19 filter_out_deleted_zvols() {
  20         OIFS="$IFS"
  21         IFS="
  22 "
  23         # shellcheck disable=SC2086
  24         zfs list -H -o name $zvols 2>/dev/null
  25         IFS="$OIFS"
  26 }
  27
  28 list_zvols() {
  29         read -r default_volmode < /sys/module/zfs/parameters/zvol_volmode
  30         zfs list -t volume -H -o \
  31             name,volmode,receive_resume_token,redact_snaps,keystatus |
  32             while IFS=" " read -r name volmode token redacted keystatus; do # IFS=\t here!
  33
  34                 # /dev links are not created for zvols with volmode = "none",
  35                 # redacted zvols, or encrypted zvols for which the key has not
  36                 # been loaded.
  37                 [ "$volmode" = "none" ] && continue
  38                 [ "$volmode" = "default" ] && [ "$default_volmode" = "3" ] &&
  39                     continue
  40                 [ "$redacted" = "-" ] || continue
  41                 [ "$keystatus" = "unavailable" ] && continue
  42
  43                 # We also ignore partially received zvols if it is
  44                 # not an incremental receive, as those won't even have a block
  45                 # device minor node created yet.
  46                 if [ "$token" != "-" ]; then
  47
  48                         # Incremental receives create an invisible clone that
  49                         # is not automatically displayed by zfs list.
  50                         if ! zfs list "$name/%recv" >/dev/null 2>&1; then
  51                                 continue
  52                         fi
  53                 fi
  54                 echo "$name"
  55         done
  56 }
  57
  58 zvols=$(list_zvols)
  59 zvols_count=$(count_zvols)
  60 if [ "$zvols_count" -eq 0 ]; then
  61         echo "No zvols found, nothing to do."
  62         exit 0
  63 fi
  64
  65 echo "Testing $zvols_count zvol links"
  66
  67 outer_loop=0
  68 while [ "$outer_loop" -lt 20 ]; do
  69         outer_loop=$((outer_loop + 1))
  70
  71         old_zvols_count=$(count_zvols)
  72
  73         inner_loop=0
  74         while [ "$inner_loop" -lt 30 ]; do
  75                 inner_loop=$((inner_loop + 1))
  76
  77                 zvols="$(filter_out_zvols_with_links)"
  78
  79                 zvols_count=$(count_zvols)
  80                 if [ "$zvols_count" -eq 0 ]; then
  81                         echo "All zvol links are now present."
  82                         exit 0
  83                 fi
  84                 sleep 1
  85         done
  86
  87         echo "Still waiting on $zvols_count zvol links ..."
  88         #
  89         # Although zvols should normally not be deleted at boot time,
  90         # if that is the case then their links will be missing and
  91         # we would stall.
  92         #
  93         if [ "$old_zvols_count" -eq "$zvols_count" ]; then
  94                 echo "No progress since last loop."
  95                 echo "Checking if any zvols were deleted."
  96
  97                 zvols=$(filter_out_deleted_zvols)
  98                 zvols_count=$(count_zvols)
  99
 100                 if [ "$old_zvols_count" -ne "$zvols_count" ]; then
 101                         echo "$((old_zvols_count - zvols_count)) zvol(s) deleted."
 102                 fi
 103
 104                 if [ "$zvols_count" -ne 0 ]; then
 105                         echo "Remaining zvols:"
 106                         echo "$zvols"
 107                 else
 108                         echo "All zvol links are now present."
 109                         exit 0
 110                 fi
 111         fi
 112
 113         #
 114         # zvol_count made some progress - let's stay in this loop.
 115         #
 116         if [ "$old_zvols_count" -gt "$zvols_count" ]; then
 117                 outer_loop=$((outer_loop - 1))
 118         fi
 119 done
 120
 121 echo "Timed out waiting on zvol links"
 122 exit 1