[LTP] [PATCH 2/2] fanotify13: Test watching overlayfs with FAN_REPORT_FID
Petr Vorel
pvorel@suse.cz
Tue Nov 21 10:59:46 CET 2023
Hi Amir,
> Hi Amir,
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
> Few notes below.
> > Run test variants watching overlayfs (over all supported fs)
> > and reporting events with fid.
> > This requires overlayfs support for AT_HANDLE_FID (kernel 6.6) and
> > even with AT_HANDLE_FID file handles, only inode marks are supported.
> > Signed-off-by: Amir Goldstein <amir73il@gmail.com>
> > ---
> > testcases/kernel/syscalls/fanotify/fanotify.h | 28 ++++++++++++-----
> > .../kernel/syscalls/fanotify/fanotify13.c | 31 ++++++++++++++++---
> > 2 files changed, 47 insertions(+), 12 deletions(-)
> > diff --git a/testcases/kernel/syscalls/fanotify/fanotify.h b/testcases/kernel/syscalls/fanotify/fanotify.h
> > index 78424a350..a8aec6597 100644
> > --- a/testcases/kernel/syscalls/fanotify/fanotify.h
> > +++ b/testcases/kernel/syscalls/fanotify/fanotify.h
> > @@ -79,8 +79,11 @@ static inline int safe_fanotify_mark(const char *file, const int lineno,
> > /*
> > * Helper function used to obtain fsid and file_handle for a given path.
> > * Used by test files correlated to FAN_REPORT_FID functionality.
> > + *
> > + * Returns 0 if normal NFS file handles are supported.
> > + * Returns AT_HANDLE_FID, of only non-decodeable file handles are supported.
> s/ of / if /
> I can fix this before merge.
I dared to fix this and s/AT_HADNLE_FID/AT_HANDLE_FID/ and merge.
> Also I noticed (not related to this change) that #define AT_HANDLE_FID 0x200
> added in dc7b1332ab into testcases/kernel/syscalls/fanotify/fanotify.h should
> have been in include/lapi/fanotify.h (this file is for fallback definitions).
> Tiny detail, which should be fixed afterwards.
I also merged a cleanup of the fallback definitions.
Thanks for maintaining fanotify tests!
Kind regards,
Petr
> > */
> > -static inline void fanotify_get_fid(const char *path, __kernel_fsid_t *fsid,
> > +static inline int fanotify_get_fid(const char *path, __kernel_fsid_t *fsid,
> > struct file_handle *handle)
> > {
> > int mount_id;
> > @@ -93,6 +96,11 @@ static inline void fanotify_get_fid(const char *path, __kernel_fsid_t *fsid,
> > if (name_to_handle_at(AT_FDCWD, path, handle, &mount_id, 0) == -1) {
> > if (errno == EOPNOTSUPP) {
> > + /* Try to request non-decodeable fid instead */
> > + if (name_to_handle_at(AT_FDCWD, path, handle, &mount_id,
> > + AT_HANDLE_FID) == 0)
> > + return AT_HANDLE_FID;
> > +
> > tst_brk(TCONF,
> > "filesystem %s does not support file handles",
> > tst_device->fs_type);
> > @@ -100,6 +108,7 @@ static inline void fanotify_get_fid(const char *path, __kernel_fsid_t *fsid,
> > tst_brk(TBROK | TERRNO,
> > "name_to_handle_at(AT_FDCWD, %s, ...) failed", path);
> > }
> > + return 0;
> > }
> > #ifndef FILEID_INVALID
> > @@ -112,18 +121,21 @@ struct fanotify_fid_t {
> > char buf[MAX_HANDLE_SZ];
> > };
> > -static inline void fanotify_save_fid(const char *path,
> > +static inline int fanotify_save_fid(const char *path,
> > struct fanotify_fid_t *fid)
> > {
> > int *fh = (int *)(fid->handle.f_handle);
> > + int ret;
> > fh[0] = fh[1] = fh[2] = 0;
> > fid->handle.handle_bytes = MAX_HANDLE_SZ;
> > - fanotify_get_fid(path, &fid->fsid, &fid->handle);
> > + ret = fanotify_get_fid(path, &fid->fsid, &fid->handle);
> > tst_res(TINFO,
> > "fid(%s) = %x.%x.%x.%x.%x...", path, fid->fsid.val[0],
> > fid->fsid.val[1], fh[0], fh[1], fh[2]);
> > +
> > + return ret;
> > }
> > #endif /* HAVE_NAME_TO_HANDLE_AT */
> > @@ -179,6 +191,7 @@ static inline int fanotify_events_supported_by_kernel(uint64_t mask,
> > * @return 0: fanotify supported both in kernel and on tested filesystem
> > * @return -1: @flags not supported in kernel
> > * @return -2: @flags not supported on tested filesystem (tested if @fname is not NULL)
> > + * @return -3: @flags not supported on overlayfs (tested if @fname == OVL_MNT)
> > */
> > static inline int fanotify_init_flags_supported_on_fs(unsigned int flags, const char *fname)
> > {
> > @@ -199,7 +212,7 @@ static inline int fanotify_init_flags_supported_on_fs(unsigned int flags, const
> > if (fname && fanotify_mark(fd, FAN_MARK_ADD, FAN_ACCESS, AT_FDCWD, fname) < 0) {
> > if (errno == ENODEV || errno == EOPNOTSUPP || errno == EXDEV) {
> > - rval = -2;
> > + rval = strcmp(fname, OVL_MNT) ? -2 : -3;
> > } else {
> > tst_brk(TBROK | TERRNO,
> > "fanotify_mark (%d, FAN_MARK_ADD, ..., AT_FDCWD, %s) failed",
> > @@ -269,10 +282,11 @@ static inline void fanotify_init_flags_err_msg(const char *flags_str,
> > if (fail == -1)
> > res_func(file, lineno, TCONF,
> > "%s not supported in kernel?", flags_str);
> > - if (fail == -2)
> > + if (fail == -2 || fail == -3)
> > res_func(file, lineno, TCONF,
> > - "%s not supported on %s filesystem",
> > - flags_str, tst_device->fs_type);
> > + "%s not supported on %s%s filesystem",
> > + flags_str, fail == -3 ? "overlayfs over " : "",
> > + tst_device->fs_type);
> > }
> > #define FANOTIFY_INIT_FLAGS_ERR_MSG(flags, fail) \
> > diff --git a/testcases/kernel/syscalls/fanotify/fanotify13.c b/testcases/kernel/syscalls/fanotify/fanotify13.c
> > index 4bcffaab2..4a7c2af23 100644
> > --- a/testcases/kernel/syscalls/fanotify/fanotify13.c
> > +++ b/testcases/kernel/syscalls/fanotify/fanotify13.c
> > @@ -91,8 +91,10 @@ static struct test_case_t {
> > static int ovl_mounted;
> > static int bind_mounted;
> > +static int ovl_bind_mounted;
> > static int nofid_fd;
> > static int fanotify_fd;
> > +static int at_handle_fid;
> > static int filesystem_mark_unsupported;
> > static char events_buf[BUF_SIZE];
> > static struct event_t event_set[EVENT_MAX];
> > @@ -113,8 +115,10 @@ static void get_object_stats(void)
> > {
> > unsigned int i;
> > - for (i = 0; i < ARRAY_SIZE(objects); i++)
> > - fanotify_save_fid(objects[i].path, &objects[i].fid);
> > + for (i = 0; i < ARRAY_SIZE(objects); i++) {
> > + at_handle_fid |=
> > + fanotify_save_fid(objects[i].path, &objects[i].fid);
> > + }
> > }
> > static int setup_marks(unsigned int fd, struct test_case_t *tc)
> > @@ -154,6 +158,11 @@ static void do_test(unsigned int number)
> > return;
> > }
> > + if (at_handle_fid && mark->flag != FAN_MARK_INODE) {
> > + tst_res(TCONF, "overlayfs does not support decodeable file handles required by %s", mark->name);
> > + return;
> > + }
> > +
> > if (filesystem_mark_unsupported && mark->flag & FAN_MARK_FILESYSTEM) {
> > tst_res(TCONF, "FAN_MARK_FILESYSTEM not supported in kernel?");
> > return;
> > @@ -169,7 +178,7 @@ static void do_test(unsigned int number)
> > goto out;
> > /* Watching base fs - open files on overlayfs */
> > - if (tst_variant) {
> > + if (tst_variant && !ovl_bind_mounted) {
> > if (mark->flag & FAN_MARK_MOUNT) {
> > tst_res(TCONF, "overlayfs base fs cannot be watched with mount mark");
> > goto out;
> > @@ -191,7 +200,7 @@ static void do_test(unsigned int number)
> > SAFE_CLOSE(fds[i]);
> > }
> > - if (tst_variant)
> > + if (tst_variant && !ovl_bind_mounted)
> > SAFE_UMOUNT(MOUNT_PATH);
> > /* Read events from event queue */
> > @@ -288,6 +297,8 @@ static void do_setup(void)
> > * Variant #0: watch base fs - open files on base fs
> > * Variant #1: watch lower fs - open lower files on overlayfs
> > * Variant #2: watch upper fs - open upper files on overlayfs
> > + * Variant #3: watch overlayfs - open lower files on overlayfs
> > + * Variant #4: watch overlayfs - open upper files on overlayfs
> > *
> > * Variants 1,2 test a bug whose fix bc2473c90fca ("ovl: enable fsnotify
> > * events on underlying real files") in kernel 6.5 is not likely to be
> > @@ -295,6 +306,8 @@ static void do_setup(void)
> > * To avoid waiting for events that won't arrive when testing old kernels,
> > * require that kernel supports encoding fid with new flag AT_HADNLE_FID,
> s/AT_HADNLE_FID/AT_HANDLE_FID/
> (old typo)
> > * also merged to 6.5 and not likely to be backported to older kernels.
> > + * Variants 3,4 test overlayfs watch with FAN_REPORT_FID, which also
> > + * requires kernel with support for AT_HADNLE_FID.
> s/AT_HADNLE_FID/AT_HANDLE_FID/
> (new typo)
> I can fix these during merge.
> Kind regards,
> Petr
> > */
> > if (tst_variant) {
> > REQUIRE_HANDLE_TYPE_SUPPORTED_BY_KERNEL(AT_HANDLE_FID);
> > @@ -319,6 +332,12 @@ static void do_setup(void)
> > /* Create file and directory objects for testing on base fs */
> > create_objects();
> > + if (tst_variant > 2) {
> > + /* Setup watches on overlayfs */
> > + SAFE_MOUNT(OVL_MNT, MOUNT_PATH, "none", MS_BIND, NULL);
> > + ovl_bind_mounted = 1;
> > + }
> > +
> > /*
> > * Create a mark on first inode without FAN_REPORT_FID, to test
> > * uninitialized connector->fsid cache. This mark remains for all test
> > @@ -337,6 +356,8 @@ static void do_cleanup(void)
> > SAFE_CLOSE(nofid_fd);
> > if (fanotify_fd > 0)
> > SAFE_CLOSE(fanotify_fd);
> > + if (ovl_bind_mounted)
> > + SAFE_UMOUNT(MOUNT_PATH);
> > if (bind_mounted) {
> > SAFE_UMOUNT(MOUNT_PATH);
> > SAFE_RMDIR(MOUNT_PATH);
> > @@ -348,7 +369,7 @@ static void do_cleanup(void)
> > static struct tst_test test = {
> > .test = do_test,
> > .tcnt = ARRAY_SIZE(test_cases),
> > - .test_variants = 3,
> > + .test_variants = 5,
> > .setup = do_setup,
> > .cleanup = do_cleanup,
> > .needs_root = 1,
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