Verify that fanotify events are correctly routed to the appropriate watcher when cloned filesystems are mounted. Helps verify kernel's event notification distinguishes between devices sharing the same FSID/UUID.
Signed-off-by: Anand Jain <[email protected]> --- tests/generic/801 | 135 ++++++++++++++++++++++++++++++++++++++++++ tests/generic/801.out | 7 +++ 2 files changed, 142 insertions(+) create mode 100644 tests/generic/801 create mode 100644 tests/generic/801.out diff --git a/tests/generic/801 b/tests/generic/801 new file mode 100644 index 000000000000..3bfb87d41922 --- /dev/null +++ b/tests/generic/801 @@ -0,0 +1,135 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2026 Anand Jain <[email protected]>. All Rights Reserved. +# +# FS QA Test 801 +# Verify fanotify FID functionality on cloned filesystems by setting up +# watchers and making sure notifications are in the correct logs files. + +. ./common/preamble + +_begin_fstest auto quick mount clone + +_require_test +_require_block_device $TEST_DEV +_require_loop +_require_command "$FSNOTIFYWAIT_PROG" fsnotifywait +_require_unique_f_fsid + +_cleanup() +{ + cd / + [[ -n $pid1 ]] && { kill -TERM "$pid1" 2> /dev/null; wait $pid1; } + [[ -n $pid2 ]] && { kill -TERM "$pid2" 2> /dev/null; wait $pid2; } + + if [ "$semanage_added" = "yes" ]; then + semanage permissive -d unconfined_t >/dev/null 2>&1 || true + fi + + umount $mnt1 $mnt2 2>/dev/null + _loop_image_destroy "${devs[@]}" 2> /dev/null + rm -r -f $tmp.* +} + +# Run fsnotifywait in unbuffered mode to watch filesystem-wide create events +monitor_fanotify() +{ + local mmnt=$1 + exec stdbuf -oL $FSNOTIFYWAIT_PROG -m -F -S -e create "$mmnt" 2>&1 +} + +# Transform f_fsid into the hi.lo format used in fanotify FID logs +fsid_to_fid_parts() +{ + local fsid=$1 + # Pad to 16 hex chars (64-bit), then split into two 32-bit halves + local padded=$(printf '%016x' "0x${fsid}") + local hi=$(printf '%x' "0x${padded:0:8}") # strips leading zeros + local lo=$(printf '%x' "0x${padded:8:8}") # strips leading zeros + echo "${hi}.${lo}" +} + +# Create base loop device and its clone +devs=() +_loop_image_create_clone devs +mkdir -p $TEST_DIR/$seq +mnt1=$TEST_DIR/$seq/mnt1 +mnt2=$TEST_DIR/$seq/mnt2 +mkdir -p $mnt1 +mkdir -p $mnt2 + +# Mount both base and clone filesystems using required clone mount options +_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[0]} $mnt1 || \ + _fail "Failed to mount dev1" +_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \ + _fail "Failed to mount dev2" + +# Fetch filesystem IDs to verify the kernel can differentiate between them +fsid1=$(stat -f -c "%i" $mnt1) +fsid2=$(stat -f -c "%i" $mnt2) + +log1=$tmp.fanotify1 +log2=$tmp.fanotify2 + +pid1="" +pid2="" +echo "Setup FID fanotify watchers on both mnt1 and mnt2" + +# Permit unconfined_t domains when SELinux is enforcing to prevent fanotify +# blockages +semanage_added="no" +if [ "$(getenforce 2>/dev/null)" = "Enforcing" ]; then + if ! semanage permissive -l | grep -q "unconfined_t"; then + semanage permissive -a unconfined_t >/dev/null 2>&1 && semanage_added="yes" + fi +fi + +# Start asynchronous fanotify monitors +( monitor_fanotify "$mnt1" > "$log1" ) & +pid1=$! +( monitor_fanotify "$mnt2" > "$log2" ) & +pid2=$! +sleep 2 + +echo "Trigger file creation on mnt1" +touch $mnt1/file_on_mnt1 +sync +sleep 1 + +echo "Trigger file creation on mnt2" +touch $mnt2/file_on_mnt2 +sync +sleep 1 + +echo "Verify fsid in the fanotify" +kill $pid1 $pid2 +wait $pid1 $pid2 2>/dev/null +pid1="" +pid2="" + +e_fsid1=$(fsid_to_fid_parts "$fsid1") +e_fsid2=$(fsid_to_fid_parts "$fsid2") + +# Dump debug details to the full log +echo $fsid1 $e_fsid1 $fsid2 $e_fsid2 >> $seqres.full +cat $log1 >> $seqres.full +cat $log2 >> $seqres.full + +# Ensure monitor 1 only captured events belonging to mnt 1 and fsid 1 +if grep -qF "$e_fsid1" "$log1" && ! grep -qF "$e_fsid2" "$log1"; then + echo "SUCCESS: mnt1 events found" +else + [ ! -s "$log1" ] && echo " - mnt1 received no events." + grep -qF "$e_fsid2" "$log1" && echo " - mnt1 received event from mnt2." +fi + +# Ensure monitor 2 only captured events belonging to mnt 2 and fsid 2 +if grep -qF "$e_fsid2" "$log2" && ! grep -qF "$e_fsid1" "$log2"; then + echo "SUCCESS: mnt2 events found" +else + [ ! -s "$log2" ] && echo " - mnt2 received no events." + grep -qF "$e_fsid1" "$log2" && echo " - mnt2 received event from mnt1." +fi + +status=0 +exit diff --git a/tests/generic/801.out b/tests/generic/801.out new file mode 100644 index 000000000000..d7b318d9f27c --- /dev/null +++ b/tests/generic/801.out @@ -0,0 +1,7 @@ +QA output created by 801 +Setup FID fanotify watchers on both mnt1 and mnt2 +Trigger file creation on mnt1 +Trigger file creation on mnt2 +Verify fsid in the fanotify +SUCCESS: mnt1 events found +SUCCESS: mnt2 events found -- 2.43.0 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
