* [PATCH v2 1/9] fstests: add _require_nouuid_mountopt() helper
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 2/9] fstests: add _loop_image_create_clone() helper Anand Jain
` (7 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Add a helper function to check if the filesystem supports the -o nouuid
mount option. The helper attempts a scratch mount with -o nouuid and
skips the test if the option is not supported by the filesystem.
Signed-off-by: Anand Jain <asj@kernel.org>
---
common/rc | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/common/rc b/common/rc
index fd4ca9641822..9e3041beee2f 100644
--- a/common/rc
+++ b/common/rc
@@ -6149,6 +6149,15 @@ _require_max_file_range_blocks()
esac
}
+_require_nouuid_mountopt()
+{
+ _require_scratch
+ _scratch_mkfs > /dev/null 2>&1 || _notrun "mkfs failed"
+ _try_scratch_mount -o nouuid > /dev/null 2>&1 || \
+ _notrun "mount -o nouuid not supported by $FSTYP"
+ _scratch_unmount
+}
+
################################################################################
# make sure this script returns success
/bin/true
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 2/9] fstests: add _loop_image_create_clone() helper
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
2026-03-21 11:58 ` [PATCH v2 1/9] fstests: add _require_nouuid_mountopt() helper Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 3/9] fstests: add _clone_mount_option() helper Anand Jain
` (6 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Introduce _loop_image_create_clone() and _loop_image_destroy() to mkfs an
image file and clone it to another image file, and attach a loop device to
them. And its destroy part.
Signed-off-by: Anand Jain <asj@kernel.org>
---
common/rc | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/common/rc b/common/rc
index 9e3041beee2f..a8e6af5d1a1b 100644
--- a/common/rc
+++ b/common/rc
@@ -1503,6 +1503,57 @@ _scratch_resvblks()
esac
}
+_loop_image_create_clone()
+{
+ local -n _ret=$1
+ local img_file=$TEST_DIR/${seq}.img
+ local img_file_clone=$TEST_DIR/${seq}_clone.img
+ local size=$(_small_fs_size_mb 128) # Smallest possible
+ local loop_devs
+ local temp_mnt=$TEST_DIR/${seq}_mnt
+
+ size=$((size * 1024 * 1024))
+ $XFS_IO_PROG -f -c "truncate $size" $img_file
+
+ case $FSTYP in
+ xfs)
+ _mkfs_dev "-s size=4096" $img_file
+ ;;
+ *)
+ _mkfs_dev $img_file
+ ;;
+ esac
+
+ case $FSTYP in
+ btrfs)
+ loop_devs=$(_create_loop_device $img_file)
+ mkdir -p $temp_mnt
+ _mount $loop_devs $temp_mnt
+ $BTRFS_UTIL_PROG subvolume create $temp_mnt/sv1 &> /dev/null
+ _unmount $temp_mnt
+ rm -r -f $temp_mnt
+ _destroy_loop_device $loop_devs
+ ;;
+ *)
+ ;;
+ esac
+
+ cp $img_file $img_file_clone
+
+ loop_devs=$(_create_loop_device $img_file)
+ loop_devs="$loop_devs $(_create_loop_device $img_file_clone)"
+
+ _ret=($loop_devs)
+}
+
+_loop_image_destroy()
+{
+ for d in "$@"; do
+ local f=$(losetup --noheadings --output BACK-FILE $d)
+ _destroy_loop_device "$d"
+ [ -n "$f" ] && rm -f "$f"
+ done
+}
# Repair scratch filesystem. Returns 0 if the FS is good to go (either no
# errors found or errors were fixed) and nonzero otherwise; also spits out
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 3/9] fstests: add _clone_mount_option() helper
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
2026-03-21 11:58 ` [PATCH v2 1/9] fstests: add _require_nouuid_mountopt() helper Anand Jain
2026-03-21 11:58 ` [PATCH v2 2/9] fstests: add _loop_image_create_clone() helper Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 4/9] fstests: add test for inotify isolation on cloned devices Anand Jain
` (5 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Adds _clone_mount_option() helper function to handle filesystem-specific
requirements for mounting cloned devices. Abstract the need for -o nouuid
on XFS.
Signed-off-by: Anand Jain <asj@kernel.org>
---
common/rc | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/common/rc b/common/rc
index a8e6af5d1a1b..7ff9815d88e3 100644
--- a/common/rc
+++ b/common/rc
@@ -397,6 +397,20 @@ _scratch_mount_options()
$SCRATCH_DEV $SCRATCH_MNT
}
+_clone_mount_option()
+{
+ local mount_opts=""
+
+ case "$FSTYP" in
+ ext4|xfs|btrfs)
+ mount_opts="-o nouuid"
+ ;;
+ *)
+ esac
+
+ echo $mount_opts
+}
+
_supports_filetype()
{
local dir=$1
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 4/9] fstests: add test for inotify isolation on cloned devices
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
` (2 preceding siblings ...)
2026-03-21 11:58 ` [PATCH v2 3/9] fstests: add _clone_mount_option() helper Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 5/9] fstests: verify fanotify isolation on cloned filesystems Anand Jain
` (4 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Add a new test, to verify that the kernel correctly differentiates between
two block devices sharing the same FSID/UUID.
Signed-off-by: Anand Jain <asj@kernel.org>
---
common/config | 1 +
tests/generic/790 | 89 +++++++++++++++++++++++++++++++++++++++++++
tests/generic/790.out | 7 ++++
3 files changed, 97 insertions(+)
create mode 100644 tests/generic/790
create mode 100644 tests/generic/790.out
diff --git a/common/config b/common/config
index 1420e35ddfee..c08f828575a2 100644
--- a/common/config
+++ b/common/config
@@ -228,6 +228,7 @@ export BTRFS_MAP_LOGICAL_PROG=$(type -P btrfs-map-logical)
export PARTED_PROG="$(type -P parted)"
export XFS_PROPERTY_PROG="$(type -P xfs_property)"
export FSCRYPTCTL_PROG="$(type -P fscryptctl)"
+export INOTIFYWAIT_PROG="$(type -P inotifywait)"
# udev wait functions.
#
diff --git a/tests/generic/790 b/tests/generic/790
new file mode 100644
index 000000000000..3d9036ee095f
--- /dev/null
+++ b/tests/generic/790
@@ -0,0 +1,89 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Anand Jain <asj@kernel.org>. All Rights Reserved.
+#
+# FS QA Test 790
+#
+# Verify if the kernel or userspace becomes confused when two block devices
+# share the same fid/fsid/uuid. Create inotify on both original and cloned
+# filesystem. Monitor the notification in the respective logs.
+
+. ./common/preamble
+
+_begin_fstest auto quick mount clone
+
+_require_test
+_require_loop
+_require_nouuid_mountopt
+_require_command "$INOTIFYWAIT_PROG" inotifywait
+
+_cleanup()
+{
+ cd /
+ [[ -n $pid1 ]] && { kill -TERM "$pid1" 2> /dev/null; wait $pid1; }
+ [[ -n $pid2 ]] && { kill -TERM "$pid2" 2> /dev/null; wait $pid2; }
+ rm -r -f $tmp.*
+ _unmount $mnt1 2>/dev/null
+ _unmount $mnt2 2>/dev/null
+ _loop_image_destroy "${devs[@]}" 2> /dev/null
+}
+
+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 $(_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]} $mnt2 || \
+ _fail "Failed to mount dev2"
+
+log1=$tmp.inotify1
+log2=$tmp.inotify2
+
+pid1=""
+pid2=""
+echo "Setup inotify watchers on both mnt1 and mnt2"
+$INOTIFYWAIT_PROG -m -e create --format '%f' $mnt1 > $log1 2>&1 &
+pid1=$!
+$INOTIFYWAIT_PROG -m -e create --format '%f' $mnt2 > $log2 2>&1 &
+pid2=$!
+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 inotify isolation"
+kill $pid1 $pid2
+wait $pid1 $pid2 2>/dev/null
+pid1=""
+pid2=""
+
+if grep -q "file_on_mnt1" $log1 && ! grep -q "file_on_mnt2" $log1; then
+ echo "SUCCESS: mnt1 events isolated."
+else
+ echo "FAIL: mnt1 inotify confusion!"
+ [ ! -s $log1 ] && echo " - mnt1 received no events."
+ grep -q "file_on_mnt2" $log1 && echo " - mnt1 received event from mnt2."
+fi
+
+if grep -q "file_on_mnt2" $log2 && ! grep -q "file_on_mnt1" $log2; then
+ echo "SUCCESS: mnt2 events isolated."
+else
+ echo "FAIL: mnt2 inotify confusion!"
+ [ ! -s $log2 ] && echo " - mnt2 received no events."
+ grep -q "file_on_mnt1" $log2 && echo " - mnt2 received event from mnt1."
+fi
+
+status=0
+exit
diff --git a/tests/generic/790.out b/tests/generic/790.out
new file mode 100644
index 000000000000..6fc08af59301
--- /dev/null
+++ b/tests/generic/790.out
@@ -0,0 +1,7 @@
+QA output created by 790
+Setup inotify watchers on both mnt1 and mnt2
+Trigger file creation on mnt1
+Trigger file creation on mnt2
+Verify inotify isolation
+SUCCESS: mnt1 events isolated.
+SUCCESS: mnt2 events isolated.
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 5/9] fstests: verify fanotify isolation on cloned filesystems
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
` (3 preceding siblings ...)
2026-03-21 11:58 ` [PATCH v2 4/9] fstests: add test for inotify isolation on cloned devices Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 6/9] fstests: verify f_fsid for " Anand Jain
` (3 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Verify that fanotify events are correctly routed to the appropriate
watcher when cloned filesystems are mounted.
Helps verify kernel's event notification distinguishes between devices
sharing the same FSID/UUID.
Signed-off-by: Anand Jain <asj@kernel.org>
---
common/config | 1 +
tests/generic/791 | 116 ++++++++++++++++++++++++++++++++++++++++++
tests/generic/791.out | 7 +++
3 files changed, 124 insertions(+)
create mode 100644 tests/generic/791
create mode 100644 tests/generic/791.out
diff --git a/common/config b/common/config
index c08f828575a2..73a2a91df9f9 100644
--- a/common/config
+++ b/common/config
@@ -229,6 +229,7 @@ export PARTED_PROG="$(type -P parted)"
export XFS_PROPERTY_PROG="$(type -P xfs_property)"
export FSCRYPTCTL_PROG="$(type -P fscryptctl)"
export INOTIFYWAIT_PROG="$(type -P inotifywait)"
+export FSNOTIFYWAIT_PROG="$(type -P fsnotifywait)"
# udev wait functions.
#
diff --git a/tests/generic/791 b/tests/generic/791
new file mode 100644
index 000000000000..26656cf8e450
--- /dev/null
+++ b/tests/generic/791
@@ -0,0 +1,116 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Anand Jain <asj@kernel.org>. All Rights Reserved.
+#
+# FS QA Test 791
+# 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_loop
+_require_nouuid_mountopt
+_require_command "$FSNOTIFYWAIT_PROG" fsnotifywait
+
+[ "$FSTYP" = "ext4" ] && _fixed_by_kernel_commit xxxxxxxxxxxx \
+ "ext4: derive f_fsid from block device to avoid collisions"
+
+_cleanup()
+{
+ cd /
+ [[ -n $pid1 ]] && { kill -TERM "$pid1" 2> /dev/null; wait $pid1; }
+ [[ -n $pid2 ]] && { kill -TERM "$pid2" 2> /dev/null; wait $pid2; }
+ umount $mnt1 $mnt2 2>/dev/null
+ _loop_image_destroy "${devs[@]}" 2> /dev/null
+ rm -r -f $tmp.*
+}
+
+monitor_fanotify()
+{
+ local mmnt=$1
+ exec stdbuf -oL $FSNOTIFYWAIT_PROG -m -F -S -e create "$mmnt" 2>&1
+}
+
+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}"
+}
+
+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 $(_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]} $mnt2 || \
+ _fail "Failed to mount dev2"
+
+fsid1=$(stat -f -c "%i" $mnt1)
+fsid2=$(stat -f -c "%i" $mnt2)
+
+[[ "$fsid1" == "$fsid2" ]] && \
+ _notrun "Require clone filesystem with unique f_fsid"
+
+log1=$tmp.fanotify1
+log2=$tmp.fanotify2
+
+pid1=""
+pid2=""
+echo "Setup FID fanotify watchers on both mnt1 and mnt2"
+( monitor_fanotify "$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")
+
+echo $fsid1 $e_fsid1 $fsid2 $e_fsid2 >> $seqres.full
+cat $log1 >> $seqres.full
+cat $log2 >> $seqres.full
+
+if grep -qF "$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
+
+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/791.out b/tests/generic/791.out
new file mode 100644
index 000000000000..50e494647388
--- /dev/null
+++ b/tests/generic/791.out
@@ -0,0 +1,7 @@
+QA output created by 791
+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
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 6/9] fstests: verify f_fsid for cloned filesystems
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
` (4 preceding siblings ...)
2026-03-21 11:58 ` [PATCH v2 5/9] fstests: verify fanotify isolation on cloned filesystems Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 7/9] fstests: verify libblkid resolution of duplicate UUIDs Anand Jain
` (2 subsequent siblings)
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Verify that the cloned filesystem provides an f_fsid that is persistent
across mount cycles, yet unique from the original filesystem's f_fsid.
Signed-off-by: Anand Jain <asj@kernel.org>
---
tests/generic/792 | 62 +++++++++++++++++++++++++++++++++++++++++++
tests/generic/792.out | 7 +++++
2 files changed, 69 insertions(+)
create mode 100644 tests/generic/792
create mode 100644 tests/generic/792.out
diff --git a/tests/generic/792 b/tests/generic/792
new file mode 100644
index 000000000000..7716928cb7d2
--- /dev/null
+++ b/tests/generic/792
@@ -0,0 +1,62 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Anand Jain <asj@kernel.org>. All Rights Reserved.
+#
+# FS QA Test 792
+# Verify f_fsid and s_uuid of cloned filesystems across mount cycle.
+
+. ./common/preamble
+
+_begin_fstest auto quick mount clone
+
+_require_test
+_require_loop
+_require_nouuid_mountopt
+
+[ "$FSTYP" = "btrfs" ] && _fixed_by_kernel_commit xxxxxxxxxxxx \
+ "btrfs: use on-disk uuid for s_uuid in temp_fsid mounts"
+[ "$FSTYP" = "btrfs" ] && _fixed_by_kernel_commit xxxxxxxxxxxx \
+ "btrfs: derive f_fsid from on-disk fsuuid and dev_t"
+
+_cleanup()
+{
+ cd /
+ rm -r -f $tmp.*
+ umount $mnt1 $mnt2 2>/dev/null
+ _loop_image_destroy "${devs[@]}" 2> /dev/null
+}
+
+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 $(_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]} $mnt2 || \
+ _fail "Failed to mount dev2"
+
+fsid_scratch=$(stat -f -c "%i" $mnt1)
+fsid_clone=$(stat -f -c "%i" $mnt2)
+
+echo "**** fsid initially ****"
+echo $fsid_scratch | sed -e "s/$fsid_scratch/FSID_SCRATCH/g"
+echo $fsid_clone | sed -e "s/$fsid_clone/FSID_CLONE/g"
+
+# Make sure fsid still match across a mount cycle, also reverse the order.
+echo "**** fsid after mount cycle ****"
+_unmount $mnt1
+_unmount $mnt2
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \
+ _fail "Failed to mount dev2"
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[0]} $mnt1 || \
+ _fail "Failed to mount dev1"
+
+stat -f -c "%i" $mnt1 | sed -e "s/$fsid_scratch/FSID_SCRATCH/g"
+stat -f -c "%i" $mnt2 | sed -e "s/$fsid_clone/FSID_CLONE/g"
+
+status=0
+exit
diff --git a/tests/generic/792.out b/tests/generic/792.out
new file mode 100644
index 000000000000..27ecbce2225e
--- /dev/null
+++ b/tests/generic/792.out
@@ -0,0 +1,7 @@
+QA output created by 792
+**** fsid initially ****
+FSID_SCRATCH
+FSID_CLONE
+**** fsid after mount cycle ****
+FSID_SCRATCH
+FSID_CLONE
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 7/9] fstests: verify libblkid resolution of duplicate UUIDs
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
` (5 preceding siblings ...)
2026-03-21 11:58 ` [PATCH v2 6/9] fstests: verify f_fsid for " Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 8/9] fstests: verify IMA isolation on cloned filesystems Anand Jain
2026-03-21 11:58 ` [PATCH v2 9/9] fstests: verify exportfs file handles " Anand Jain
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Verify how findmnt, df (libblkid) resolve device paths when multiple
block devices share the same FSUUID.
Signed-off-by: Anand Jain <asj@kernel.org>
---
tests/generic/793 | 76 +++++++++++++++++++++++++++++++++++++++++++
tests/generic/793.out | 19 +++++++++++
2 files changed, 95 insertions(+)
create mode 100644 tests/generic/793
create mode 100644 tests/generic/793.out
diff --git a/tests/generic/793 b/tests/generic/793
new file mode 100644
index 000000000000..fa5d8a6fe642
--- /dev/null
+++ b/tests/generic/793
@@ -0,0 +1,76 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Anand Jain <asj@kernel.org>. All Rights Reserved.
+#
+# FS QA Test 793
+# Verify how libblkid resolve devices when multiple devices sharing the
+# same FSUUID.
+
+. ./common/preamble
+. ./common/filter
+
+_begin_fstest auto quick mount clone
+
+_require_test
+_require_loop
+_require_nouuid_mountopt
+
+_cleanup()
+{
+ cd /
+ rm -r -f $tmp.*
+ umount $mnt1 $mnt2 2>/dev/null
+ _loop_image_destroy "${devs[@]}" 2> /dev/null
+}
+
+filter_pool()
+{
+ sed -e "s|${devs[0]}|DEV1|g" -e "s|${mnt1}|MNT1|g" \
+ -e "s|${devs[1]}|DEV2|g" -e "s|${mnt2}|MNT2|g" | _filter_spaces
+}
+
+print_info()
+{
+ local mntpt=$1
+ local tgt=$(findmnt -no SOURCE $mntpt)
+ local fsuuid=$(blkid -s UUID -o value $tgt)
+
+ echo "mntpt=$mntpt tgt=$tgt fsuuid=$fsuuid" >> $seqres.full
+ echo
+ findmnt -o SOURCE,TARGET,UUID "$tgt" | tail -n +2 | \
+ sed -e "s/${fsuuid}/FSUUID/g" | filter_pool
+ awk -v dev="$tgt" '$1 == dev { print $1, $2 }' /proc/self/mounts | \
+ filter_pool
+ df --all --output=source,target "$tgt" | tail -n +2 | filter_pool
+}
+
+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 $(_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"
+
+print_info $mnt1
+print_info $mnt2
+
+echo
+echo "**** mount cycle ****"
+_unmount $mnt1
+_unmount $mnt2
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \
+ _fail "Failed to mount dev2"
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[0]} $mnt1 || \
+ _fail "Failed to mount dev1"
+
+print_info $mnt1
+print_info $mnt2
+
+status=0
+exit
diff --git a/tests/generic/793.out b/tests/generic/793.out
new file mode 100644
index 000000000000..53cb4d850d93
--- /dev/null
+++ b/tests/generic/793.out
@@ -0,0 +1,19 @@
+QA output created by 793
+
+DEV1 MNT1 FSUUID
+DEV1 MNT1
+DEV1 MNT1
+
+DEV2 MNT2 FSUUID
+DEV2 MNT2
+DEV2 MNT2
+
+**** mount cycle ****
+
+DEV1 MNT1 FSUUID
+DEV1 MNT1
+DEV1 MNT1
+
+DEV2 MNT2 FSUUID
+DEV2 MNT2
+DEV2 MNT2
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 8/9] fstests: verify IMA isolation on cloned filesystems
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
` (6 preceding siblings ...)
2026-03-21 11:58 ` [PATCH v2 7/9] fstests: verify libblkid resolution of duplicate UUIDs Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
2026-03-21 11:58 ` [PATCH v2 9/9] fstests: verify exportfs file handles " Anand Jain
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Add testcase to verify IMA measurement isolation when multiple devices
share the same FSUUID.
Signed-off-by: Anand Jain <asj@kernel.org>
---
tests/generic/794 | 103 ++++++++++++++++++++++++++++++++++++++++++
tests/generic/794.out | 10 ++++
2 files changed, 113 insertions(+)
create mode 100644 tests/generic/794
create mode 100644 tests/generic/794.out
diff --git a/tests/generic/794 b/tests/generic/794
new file mode 100644
index 000000000000..391563b84cfc
--- /dev/null
+++ b/tests/generic/794
@@ -0,0 +1,103 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Anand Jain <asj@kernel.org>. All Rights Reserved.
+#
+# FS QA Test 794
+# Verify IMA isolation on cloned filesystems:
+# . Mount two devices sharing the same FSUUID (cloned).
+# . Apply an IMA policy to measure files based on that FSUUID.
+# . Create unique files on each mount point to trigger measurements.
+# . Confirm the IMA log correctly attributes events to the respective mounts.
+
+. ./common/preamble
+. ./common/filter
+
+_begin_fstest auto quick clone
+
+_require_test
+_require_loop
+_require_nouuid_mountopt
+
+[ "$FSTYP" = "btrfs" ] && _fixed_by_kernel_commit xxxxxxxxxxxx \
+ "btrfs: use on-disk uuid for s_uuid in temp_fsid mounts"
+[ "$FSTYP" = "btrfs" ] && _fixed_by_kernel_commit xxxxxxxxxxxx \
+ "btrfs: derive f_fsid from on-disk fsuuid and dev_t"
+
+_cleanup()
+{
+ cd /
+ rm -r -f $tmp.*
+ _unmount $mnt1 2>/dev/null
+ _unmount $mnt2 2>/dev/null
+ _loop_image_destroy "${devs[@]}" 2> /dev/null
+}
+
+filter_pool()
+{
+ sed -e "s|${devs[0]}|DEV1|g" -e "s|$mnt1|MNT1|g" \
+ -e "s|${devs[1]}|DEV2|g" -e "s|$mnt2|MNT2|g" | _filter_spaces
+}
+
+do_ima()
+{
+ local ima_policy="/sys/kernel/security/ima/policy"
+ local ima_log="/sys/kernel/security/ima/ascii_runtime_measurements"
+ local fsuuid
+ local mnt=$1
+ local enable=$2
+
+ # Since the in-memory IMA audit log is only cleared upon reboot,
+ # use unique random filenames to avoid log collisions.
+ local foofile=$(mktemp --dry-run foobar_XXXXX)
+
+ echo $mnt $enable | filter_pool
+
+ [ -w "$ima_policy" ] || _notrun "IMA policy not writable"
+
+ fsuuid=$(blkid -s UUID -o value ${devs[0]})
+
+ # Load IMA policy to measure file access specifically for this
+ # filesystem UUID.
+ if [[ $enable -eq 1 ]]; then
+ echo "measure func=FILE_CHECK fsuuid=$fsuuid" > "$ima_policy" || \
+ _notrun "Policy rejected"
+ fi
+
+ # Create a file to trigger measurement and verify its entry in
+ # the IMA log.
+ echo "test_data" > $mnt/$foofile
+
+ # For $ima_log column entry please ref to
+ grep $foofile "$ima_log" | awk '{ print $5 }' | filter_pool | \
+ sed "s/$foofile/FOOBAR_FILE/"
+
+ echo "dbg: $mnt $fsuuid $foofile" >> $seqres.full
+ cat $ima_log | tail -1 >> $seqres.full
+ echo >> $seqres.full
+}
+
+devs=()
+_loop_image_create_clone devs
+mnt1=$TEST_DIR/$seq/mnt1
+mnt2=$TEST_DIR/$seq/mnt2
+mkdir -p $mnt1
+mkdir -p $mnt2
+
+_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"
+
+do_ima $mnt1 1
+do_ima $mnt2 0
+
+# Btrfs uses in-memory dynamic temp_fsid
+echo mount cycle
+_unmount $mnt2
+_mount $mount_opts ${devs[1]} $mnt2 || _fail "Failed to mount dev2"
+
+do_ima $mnt1 0
+do_ima $mnt2 0
+
+status=0
+exit
diff --git a/tests/generic/794.out b/tests/generic/794.out
new file mode 100644
index 000000000000..492f8b0b0bec
--- /dev/null
+++ b/tests/generic/794.out
@@ -0,0 +1,10 @@
+QA output created by 794
+MNT1 1
+MNT1/FOOBAR_FILE
+MNT2 0
+MNT2/FOOBAR_FILE
+mount cycle
+MNT1 0
+MNT1/FOOBAR_FILE
+MNT2 0
+MNT2/FOOBAR_FILE
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread* [PATCH v2 9/9] fstests: verify exportfs file handles on cloned filesystems
2026-03-21 11:58 [PATCH v2 0/9] fstests: add test coverage for cloned filesystem ids Anand Jain
` (7 preceding siblings ...)
2026-03-21 11:58 ` [PATCH v2 8/9] fstests: verify IMA isolation on cloned filesystems Anand Jain
@ 2026-03-21 11:58 ` Anand Jain
8 siblings, 0 replies; 10+ messages in thread
From: Anand Jain @ 2026-03-21 11:58 UTC (permalink / raw)
To: fstests; +Cc: linux-btrfs, linux-ext4, linux-xfs, amir73il, zlang, hch
Ensure that exportfs can correctly decode file handles on a cloned
filesystem across a mount cycle, by file handles generated on a
cloned device remain valid after mount cycle.
Signed-off-by: Anand Jain <asj@kernel.org>
---
tests/generic/795 | 73 +++++++++++++++++++++++++++++++++++++++++++
tests/generic/795.out | 2 ++
2 files changed, 75 insertions(+)
create mode 100644 tests/generic/795
create mode 100644 tests/generic/795.out
diff --git a/tests/generic/795 b/tests/generic/795
new file mode 100644
index 000000000000..e7ba146350ee
--- /dev/null
+++ b/tests/generic/795
@@ -0,0 +1,73 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2026 Anand Jain <asj@kernel.org>. All Rights Reserved.
+#
+# FS QA Test No. 795
+
+. ./common/preamble
+
+_begin_fstest auto quick exportfs clone
+
+_require_test
+_require_exportfs
+_require_loop
+_require_nouuid_mountopt
+_require_test_program "open_by_handle"
+
+_cleanup()
+{
+ cd /
+ rm -r -f $tmp.*
+ _unmount $mnt1 2>/dev/null
+ _unmount $mnt2 2>/dev/null
+ _loop_image_destroy "${devs[@]}" 2> /dev/null
+}
+
+# Create test dir and test files, encode file handles and store to tmp file
+create_test_files()
+{
+ rm -rf $testdir
+ mkdir -p $testdir
+ $here/src/open_by_handle -cwp -o $tmp.handles_file $testdir $NUMFILES
+}
+
+# Decode file handles loaded from tmp file
+test_file_handles()
+{
+ local opt=$1
+ local when=$2
+
+ echo test_file_handles after $when
+ $here/src/open_by_handle $opt -i $tmp.handles_file $mnt2 $NUMFILES
+}
+
+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 $(_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]} $mnt2 || \
+ _fail "Failed to mount dev2"
+
+NUMFILES=1
+testdir=$mnt2/testdir
+
+# Decode file handles of files/dir after cycle mount
+create_test_files
+
+_unmount $mnt1
+_unmount $mnt2
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[1]} $mnt2 || \
+ _fail "Failed to mount dev2"
+_mount $(_common_dev_mount_options) $(_clone_mount_option) ${devs[0]} $mnt1 || \
+ _fail "Failed to mount dev1"
+
+test_file_handles -rp "cycle mount"
+
+status=0
+exit
diff --git a/tests/generic/795.out b/tests/generic/795.out
new file mode 100644
index 000000000000..774fe7487d65
--- /dev/null
+++ b/tests/generic/795.out
@@ -0,0 +1,2 @@
+QA output created by 795
+test_file_handles after cycle mount
--
2.43.0
^ permalink raw reply related [flat|nested] 10+ messages in thread