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26b6047469
The zfs-volume-wait.service scans existing zvols and waits for their links under /dev to be created. Any service that depends on zvol links to be there should add a dependency on zfs-volumes.target. By default, this target is not enabled. Reviewed-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> Reviewed-by: Antonio Russo <antonio.e.russo@gmail.com> Reviewed-by: Richard Laager <rlaager@wiktel.com> Reviewed-by: loli10K <ezomori.nozomu@gmail.com> Reviewed-by: John Gallagher <john.gallagher@delphix.com> Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Pavel Zakharov <pzakharov@delphix.com> Closes #8975
94 lines
1.9 KiB
Bash
Executable File
94 lines
1.9 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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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
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}
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filter_out_deleted_zvols() {
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while read -r zvol; do
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if zfs list "$zvol" >/dev/null 2>&1; then
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echo "$zvol"
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fi
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done
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}
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list_zvols() {
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zfs list -t volume -H -o name,volmode | while read -r zvol_line; do
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name=$(echo "$zvol_line" | awk '{print $1}')
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volmode=$(echo "$zvol_line" | awk '{print $2}')
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# /dev links are not created for zvols with volmode = "none".
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[ "$volmode" = "none" ] || 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="$(echo "$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 "$zvols_count" ]; then
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echo "No progress since last loop."
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echo "Checking if any zvols were deleted."
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zvols=$(echo "$zvols" | filter_out_deleted_zvols)
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zvols_count=$(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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done
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echo "Timed out waiting on zvol links"
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exit 1
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