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btrfs-progs: tests: verify cross mount point behavior for rootdir

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The new test case creates a special layout like this:

rootdir/	(fs1 ino=256)
|- dir1/	(fs1 ino=257)
|  |- dir1/	(fs2 ino=257)
|  |- dir2/	(fs2 ino=258)
|  |- file1	(fs2 ino=259)
|  |- file2	(fs2 ino=260)
|- dir2/	(fs1 ino=258)
|- file1	(fs1 ino=259)
|- file2	(fs2 ino=259)

This layout intentionally creates inode number conflicts, which will
make the old "mkfs.btrfs --rootdir" to fail.
But newer reworked one will successfully handle them, just leave a test
case to avoid to hit the old bugs.

Signed-off-by: Qu Wenruo <wqu@suse.com>
This commit is contained in:
Qu Wenruo 2024-08-01 15:19:25 +09:30 committed by David Sterba
parent aa5469da9c
commit cdb9aaaf03
1 changed files with 46 additions and 0 deletions
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46
tests/mkfs-tests/035-rootdir-cross-mount/test.sh Executable file
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@ -0,0 +1,46 @@
#!/bin/bash
#
# Test if "mkfs.btrfs --rootdir" would handle a rootdir with subdirectories
# on another fs.
source "$TEST_TOP/common" || exit
setup_root_helper
# Here we need 3 devices, one for the rootdir, one for a subdirectory of
# rootdir. This is to ensure we have conflicting inode numbers among the
# two filesystems.
# The last device is the for the mkfs.
setup_loopdevs 3
prepare_loopdevs
dev1=${loopdevs[1]}
dev2=${loopdevs[2]}
dev3=${loopdevs[3]}
tmpdir=$(_mktemp_dir mkfs-rootdir-cross-mount)
run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$dev1"
run_check $SUDO_HELPER "$TOP/mkfs.btrfs" -f "$dev2"
# Populate both filesystems with the same contents. So that we're ensured
# to have conflicting inode numbers.
for i in "$dev1" "$dev2"; do
run_check $SUDO_HELPER mount -t btrfs "$i" "$tmpdir"
run_check mkdir "$tmpdir/dir1" "$tmpdir/dir2"
run_check touch "$tmpdir/file1" "$tmpdir/file2"
run_check $SUDO_HELPER umount "$tmpdir"
done
run_check $SUDO_HELPER mount -t btrfs "$dev1" "$tmpdir"
run_check $SUDO_HELPER mount -t btrfs "$dev2" "$tmpdir/dir1"
# The old rootdir implementation relies on the st_ino from the host fs, but
# doesn't do any cross-mount checks, it would result conflicting inode numbers
# and fail.
run_check "$TOP/mkfs.btrfs" --rootdir "$tmpdir" -f "$dev3"
run_check $SUDO_HELPER umount "$tmpdir/dir1"
run_check $SUDO_HELPER umount "$tmpdir"
run_check "$TOP/btrfs" check "$dev3"
rm -rf -- "$tmpdir"
cleanup_loopdevs