e5646c5e37
Setups that have a lot of zvols may see zvol_wait terminate prematurely even though the script is still making progress. For example, we have a customer that called zvol_wait for ~7100 zvols and by the last iteration of that script it was still waiting on ~2900. Similarly another one called zvol_wait for 2200 and by the time the script terminated there were only 50 left. This patch adjusts the logic to stay within the outer loop of the script if we are making any progress whatsoever. Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: Don Brady <don.brady@delphix.com> Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com> Closes #13998
123 lines
2.8 KiB
Bash
Executable File
123 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
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count_zvols() {
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if [ -z "$zvols" ]; then
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echo 0
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else
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echo "$zvols" | wc -l
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fi
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}
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filter_out_zvols_with_links() {
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echo "$zvols" | tr ' ' '+' | while read -r zvol; do
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if ! [ -L "/dev/zvol/$zvol" ]; then
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echo "$zvol"
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fi
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done | tr '+' ' '
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}
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filter_out_deleted_zvols() {
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OIFS="$IFS"
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IFS="
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"
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# shellcheck disable=SC2086
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zfs list -H -o name $zvols 2>/dev/null
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IFS="$OIFS"
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}
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list_zvols() {
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read -r default_volmode < /sys/module/zfs/parameters/zvol_volmode
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zfs list -t volume -H -o \
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name,volmode,receive_resume_token,redact_snaps,keystatus |
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while IFS=" " read -r name volmode token redacted keystatus; do # IFS=\t here!
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# /dev links are not created for zvols with volmode = "none",
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# redacted zvols, or encrypted zvols for which the key has not
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# been loaded.
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[ "$volmode" = "none" ] && continue
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[ "$volmode" = "default" ] && [ "$default_volmode" = "3" ] &&
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continue
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[ "$redacted" = "-" ] || continue
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[ "$keystatus" = "unavailable" ] && continue
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# We also ignore partially received zvols if it is
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# not an incremental receive, as those won't even have a block
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# device minor node created yet.
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if [ "$token" != "-" ]; then
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# Incremental receives create an invisible clone that
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# is not automatically displayed by zfs list.
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if ! zfs list "$name/%recv" >/dev/null 2>&1; then
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continue
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fi
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fi
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echo "$name"
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done
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}
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zvols=$(list_zvols)
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zvols_count=$(count_zvols)
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if [ "$zvols_count" -eq 0 ]; then
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echo "No zvols found, nothing to do."
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exit 0
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fi
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echo "Testing $zvols_count zvol links"
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outer_loop=0
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while [ "$outer_loop" -lt 20 ]; do
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outer_loop=$((outer_loop + 1))
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old_zvols_count=$(count_zvols)
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inner_loop=0
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while [ "$inner_loop" -lt 30 ]; do
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inner_loop=$((inner_loop + 1))
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zvols="$(filter_out_zvols_with_links)"
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zvols_count=$(count_zvols)
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if [ "$zvols_count" -eq 0 ]; then
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echo "All zvol links are now present."
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exit 0
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fi
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sleep 1
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done
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echo "Still waiting on $zvols_count zvol links ..."
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#
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# Although zvols should normally not be deleted at boot time,
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# if that is the case then their links will be missing and
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# we would stall.
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#
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if [ "$old_zvols_count" -eq "$zvols_count" ]; then
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echo "No progress since last loop."
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echo "Checking if any zvols were deleted."
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zvols=$(filter_out_deleted_zvols)
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zvols_count=$(count_zvols)
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if [ "$old_zvols_count" -ne "$zvols_count" ]; then
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echo "$((old_zvols_count - zvols_count)) zvol(s) deleted."
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fi
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if [ "$zvols_count" -ne 0 ]; then
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echo "Remaining zvols:"
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echo "$zvols"
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else
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echo "All zvol links are now present."
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exit 0
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fi
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fi
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#
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# zvol_count made some progress - let's stay in this loop.
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#
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if [ "$old_zvols_count" -gt "$zvols_count" ]; then
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outer_loop=$((outer_loop - 1))
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fi
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done
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echo "Timed out waiting on zvol links"
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exit 1
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