[PATCH xfstests v3 2/2] generic/756: test name_to_handle_at(AT_HANDLE_MNT_ID_UNIQUE) explicitly
From: Aleksa Sarai
Date: Wed Sep 04 2024 - 13:58:05 EST
In order to make sure we are actually testing AT_HANDLE_MNT_ID_UNIQUE,
add a test (based on generic/426) which runs the open_by_handle in a
mode where it will error out if there is a problem with getting mount
IDs. The test is skipped if the kernel doesn't support the necessary
features.
Suggested-by: Amir Goldstein <amir73il@xxxxxxxxx>
Signed-off-by: Aleksa Sarai <cyphar@xxxxxxxxxx>
---
common/rc | 24 ++++++++++++++++
src/open_by_handle.c | 63 ++++++++++++++++++++++++++++++++++-------
tests/generic/756 | 65 +++++++++++++++++++++++++++++++++++++++++++
tests/generic/756.out | 5 ++++
4 files changed, 147 insertions(+), 10 deletions(-)
create mode 100755 tests/generic/756
create mode 100644 tests/generic/756.out
diff --git a/common/rc b/common/rc
index 9da9fe188297..0beaf2ff1126 100644
--- a/common/rc
+++ b/common/rc
@@ -5178,6 +5178,30 @@ _require_fibmap()
rm -f $file
}
+_require_statx_unique_mountid()
+{
+ # statx(STATX_MNT_ID=0x1000) was added in Linux 5.8.
+ # statx(STATX_MNT_ID_UNIQUE=0x4000) was added in Linux 6.9.
+ # We only need to check the latter.
+
+ export STATX_MNT_ID_UNIQUE=0x4000
+ local statx_mask=$(
+ ${XFS_IO_PROG} -c "statx -m $STATX_MNT_ID_UNIQUE -r" "$TEST_DIR" |
+ sed -En 's/stat\.mask = (0x[0-9a-f]+)/\1/p'
+ )
+
+ [[ $(( statx_mask & STATX_MNT_ID_UNIQUE )) == $((STATX_MNT_ID_UNIQUE)) ]] ||
+ _notrun "statx does not support STATX_MNT_ID_UNIQUE on this kernel"
+}
+
+_require_open_by_handle_unique_mountid()
+{
+ _require_test_program "open_by_handle"
+
+ $here/src/open_by_handle -C AT_HANDLE_MNT_ID_UNIQUE 2>&1 \
+ || _notrun "name_to_handle_at does not support AT_HANDLE_MNT_ID_UNIQUE"
+}
+
_try_wipe_scratch_devs()
{
test -x "$WIPEFS_PROG" || return 0
diff --git a/src/open_by_handle.c b/src/open_by_handle.c
index 920ec7d9170b..b5c1a30abbbc 100644
--- a/src/open_by_handle.c
+++ b/src/open_by_handle.c
@@ -106,9 +106,11 @@ struct handle {
void usage(void)
{
- fprintf(stderr, "usage: open_by_handle [-cludmrwapknhs] [<-i|-o> <handles_file>] <test_dir> [num_files]\n");
+ fprintf(stderr, "usage: open_by_handle [-cludmMrwapknhs] [<-i|-o> <handles_file>] <test_dir> [num_files]\n");
+ fprintf(stderr, " open_by_handle -C <feature>\n");
fprintf(stderr, "\n");
fprintf(stderr, "open_by_handle -c <test_dir> [N] - create N test files under test_dir, try to get file handles and exit\n");
+ fprintf(stderr, "open_by_handle -c <test_dir> [N] - create N test files under test_dir, try to get file handles and exit\n");
fprintf(stderr, "open_by_handle <test_dir> [N] - get file handles of test files, drop caches and try to open by handle\n");
fprintf(stderr, "open_by_handle -n <test_dir> [N] - get file handles of test files and try to open by handle without drop caches\n");
fprintf(stderr, "open_by_handle -k <test_dir> [N] - get file handles of files that are kept open, drop caches and try to open by handle\n");
@@ -117,19 +119,23 @@ void usage(void)
fprintf(stderr, "open_by_handle -a <test_dir> [N] - write data to test files after open by handle\n");
fprintf(stderr, "open_by_handle -l <test_dir> [N] - create hardlinks to test files, drop caches and try to open by handle\n");
fprintf(stderr, "open_by_handle -u <test_dir> [N] - unlink (hardlinked) test files, drop caches and try to open by handle\n");
- fprintf(stderr, "open_by_handle -U <test_dir> [N] - verify the mount ID returned with AT_HANDLE_MNT_ID_UNIQUE is correct\n");
fprintf(stderr, "open_by_handle -d <test_dir> [N] - unlink test files and hardlinks, drop caches and try to open by handle\n");
fprintf(stderr, "open_by_handle -m <test_dir> [N] - rename test files, drop caches and try to open by handle\n");
+ fprintf(stderr, "open_by_handle -M <test_dir> [N] - do not silently skip the mount ID verifications\n");
fprintf(stderr, "open_by_handle -p <test_dir> - create/delete and try to open by handle also test_dir itself\n");
fprintf(stderr, "open_by_handle -i <handles_file> <test_dir> [N] - read test files handles from file and try to open by handle\n");
fprintf(stderr, "open_by_handle -o <handles_file> <test_dir> [N] - get file handles of test files and write handles to file\n");
fprintf(stderr, "open_by_handle -s <test_dir> [N] - wait in sleep loop after opening files by handle to keep them open\n");
fprintf(stderr, "open_by_handle -z <test_dir> [N] - query filesystem required buffer size\n");
+ fprintf(stderr, "\n");
+ fprintf(stderr, "open_by_handle -C <feature> - check if <feature> is supported by the kernel.\n");
+ fprintf(stderr, " <feature> can be any of the following values:\n");
+ fprintf(stderr, " - AT_HANDLE_MNT_ID_UNIQUE\n");
exit(EXIT_FAILURE);
}
static int do_name_to_handle_at(const char *fname, struct file_handle *fh,
- int bufsz)
+ int bufsz, bool force_check_mountid)
{
int ret;
int mntid_short;
@@ -145,10 +151,15 @@ static int do_name_to_handle_at(const char *fname, struct file_handle *fh,
fprintf(stderr, "%s: statx(STATX_MNT_ID): %m\n", fname);
return EXIT_FAILURE;
}
- if (!(statxbuf.stx_mask & STATX_MNT_ID))
+ if (!(statxbuf.stx_mask & STATX_MNT_ID)) {
+ if (force_check_mountid) {
+ fprintf(stderr, "%s: statx(STATX_MNT_ID) not supported by running kernel\n", fname);
+ return EXIT_FAILURE;
+ }
skip_mntid = true;
- else
+ } else {
statx_mntid_short = statxbuf.stx_mnt_id;
+ }
}
if (!skip_mntid_unique) {
@@ -160,10 +171,15 @@ static int do_name_to_handle_at(const char *fname, struct file_handle *fh,
* STATX_MNT_ID_UNIQUE was added fairly recently in Linux 6.8, so if the
* kernel doesn't give us a unique mount ID just skip it.
*/
- if (!(statxbuf.stx_mask & STATX_MNT_ID_UNIQUE))
+ if (!(statxbuf.stx_mask & STATX_MNT_ID_UNIQUE)) {
+ if (force_check_mountid) {
+ fprintf(stderr, "%s: statx(STATX_MNT_ID_UNIQUE) not supported by running kernel\n", fname);
+ return EXIT_FAILURE;
+ }
skip_mntid_unique = true;
- else
+ } else {
statx_mntid_unique = statxbuf.stx_mnt_id;
+ }
}
fh->handle_bytes = bufsz;
@@ -204,6 +220,10 @@ static int do_name_to_handle_at(const char *fname, struct file_handle *fh,
return EXIT_FAILURE;
}
/* EINVAL means AT_HANDLE_MNT_ID_UNIQUE is not supported */
+ if (force_check_mountid) {
+ fprintf(stderr, "%s: name_to_handle_at(AT_HANDLE_MNT_ID_UNIQUE) not supported by running kernel\n", fname);
+ return EXIT_FAILURE;
+ }
skip_mntid_unique = true;
} else {
if (mntid_unique != statx_mntid_unique) {
@@ -216,6 +236,22 @@ static int do_name_to_handle_at(const char *fname, struct file_handle *fh,
return 0;
}
+static int check_feature(const char *feature)
+{
+ if (!strcmp(feature, "AT_HANDLE_MNT_ID_UNIQUE")) {
+ int ret = name_to_handle_at(AT_FDCWD, ".", NULL, NULL, AT_HANDLE_MNT_ID_UNIQUE);
+ /* If AT_HANDLE_MNT_ID_UNIQUE is supported, we get EFAULT. */
+ if (ret < 0 && errno == EINVAL) {
+ fprintf(stderr, "name_to_handle_at(AT_HANDLE_MNT_ID_UNIQUE) not supported by running kernel\n");
+ return EXIT_FAILURE;
+ }
+ return 0;
+ }
+
+ fprintf(stderr, "unknown feature name '%s'\n", feature);
+ return EXIT_FAILURE;
+}
+
int main(int argc, char **argv)
{
int i, c;
@@ -235,16 +271,20 @@ int main(int argc, char **argv)
int create = 0, delete = 0, nlink = 1, move = 0;
int rd = 0, wr = 0, wrafter = 0, parent = 0;
int keepopen = 0, drop_caches = 1, sleep_loop = 0;
+ int force_check_mountid = 0;
int bufsz = MAX_HANDLE_SZ;
if (argc < 2)
usage();
- while ((c = getopt(argc, argv, "cludmrwapknhi:o:sz")) != -1) {
+ while ((c = getopt(argc, argv, "cC:ludmMrwapknhi:o:sz")) != -1) {
switch (c) {
case 'c':
create = 1;
break;
+ case 'C':
+ /* Check kernel feature support. */
+ return check_feature(optarg);
case 'w':
/* Write data before open_by_handle_at() */
wr = 1;
@@ -271,6 +311,9 @@ int main(int argc, char **argv)
case 'm':
move = 1;
break;
+ case 'M':
+ force_check_mountid = 1;
+ break;
case 'p':
parent = 1;
break;
@@ -403,7 +446,7 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
} else {
- ret = do_name_to_handle_at(fname, &handle[i].fh, bufsz);
+ ret = do_name_to_handle_at(fname, &handle[i].fh, bufsz, force_check_mountid);
if (ret)
return EXIT_FAILURE;
}
@@ -433,7 +476,7 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
} else {
- ret = do_name_to_handle_at(test_dir, &dir_handle.fh, bufsz);
+ ret = do_name_to_handle_at(test_dir, &dir_handle.fh, bufsz, force_check_mountid);
if (ret)
return EXIT_FAILURE;
}
diff --git a/tests/generic/756 b/tests/generic/756
new file mode 100755
index 000000000000..c7a82cfd25f4
--- /dev/null
+++ b/tests/generic/756
@@ -0,0 +1,65 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (C) 2017 CTERA Networks. All Rights Reserved.
+# Copyright (C) 2024 Aleksa Sarai <cyphar@xxxxxxxxxx>
+#
+# FS QA Test No. 756
+#
+# Check stale handles pointing to unlinked files and non-stale handles pointing
+# to linked files while verifying that u64 mount IDs are correctly returned.
+#
+. ./common/preamble
+_begin_fstest auto quick exportfs
+
+# Import common functions.
+. ./common/filter
+
+
+# Modify as appropriate.
+_require_test
+# _require_exportfs and already requires open_by_handle, but let's not count on it
+_require_test_program "open_by_handle"
+_require_exportfs
+# We need both STATX_MNT_ID_UNIQUE and AT_HANDLE_MNT_ID_UNIQUE.
+_require_statx_unique_mountid
+_require_open_by_handle_unique_mountid
+
+NUMFILES=1024
+testdir=$TEST_DIR/$seq-dir
+mkdir -p $testdir
+
+# Create empty test files in test dir
+create_test_files()
+{
+ local dir=$1
+
+ mkdir -p $dir
+ rm -f $dir/*
+ $here/src/open_by_handle -c $dir $NUMFILES
+}
+
+# Test encode/decode file handles
+test_file_handles()
+{
+ local dir=$1
+ local opt=$2
+
+ echo test_file_handles $* | _filter_test_dir
+ $here/src/open_by_handle $opt $dir $NUMFILES
+}
+
+# Check stale handles to deleted files
+create_test_files $testdir
+test_file_handles $testdir -Md
+
+# Check non-stale handles to linked files
+create_test_files $testdir
+test_file_handles $testdir -M
+
+# Check non-stale handles to files that were hardlinked and original deleted
+create_test_files $testdir
+test_file_handles $testdir -Ml
+test_file_handles $testdir -Mu
+
+status=0
+exit
diff --git a/tests/generic/756.out b/tests/generic/756.out
new file mode 100644
index 000000000000..48aed88d87b9
--- /dev/null
+++ b/tests/generic/756.out
@@ -0,0 +1,5 @@
+QA output created by 756
+test_file_handles TEST_DIR/756-dir -Md
+test_file_handles TEST_DIR/756-dir -M
+test_file_handles TEST_DIR/756-dir -Ml
+test_file_handles TEST_DIR/756-dir -Mu
--
2.46.0