Merge tag 'vfs-6.17-rc6.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfsHEADmaster

Pull vfs fixes from Christian Brauner:
 "fuse:

   - Prevent opening of non-regular backing files.

     Fuse doesn't support non-regular files anyway.

   - Check whether copy_file_range() returns a larger size than
     requested.

   - Prevent overflow in copy_file_range() as fuse currently only
     supports 32-bit sized copies.

   - Cache the blocksize value if the server returned a new value as
     inode->i_blkbits isn't modified directly anymore.

   - Fix i_blkbits handling for iomap partial writes.

     By default i_blkbits is set to PAGE_SIZE which causes iomap to mark
     the whole folio as uptodate even on a partial write. But fuseblk
     filesystems support choosing a blocksize smaller than PAGE_SIZE
     risking data corruption. Simply enforce PAGE_SIZE as blocksize for
     fuseblk's internal inode for now.

   - Prevent out-of-bounds acces in fuse_dev_write() when the number of
     bytes to be retrieved is truncated to the fc->max_pages limit.

  virtiofs:

   - Fix page faults for DAX page addresses.

  Misc:

   - Tighten file handle decoding from userns.

     Check that the decoded dentry itself has a valid idmapping in the
     user namespace.

   - Fix mount-notify selftests.

   - Fix some indentation errors.

   - Add an FMODE_ flag to indicate IOCB_HAS_METADATA availability.

     This will be moved to an FOP_* flag with a bit more rework needed
     for that to happen not suitable for a fix.

   - Don't silently ignore metadata for sync read/write.

   - Don't pointlessly log warning when reading coredump sysctls"

* tag 'vfs-6.17-rc6.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  fuse: virtio_fs: fix page fault for DAX page address
  selftests/fs/mount-notify: Fix compilation failure.
  fhandle: use more consistent rules for decoding file handle from userns
  fuse: Block access to folio overlimit
  fuse: fix fuseblk i_blkbits for iomap partial writes
  fuse: reflect cached blocksize if blocksize was changed
  fuse: prevent overflow in copy_file_range return value
  fuse: check if copy_file_range() returns larger than requested size
  fuse: do not allow mapping a non-regular backing file
  coredump: don't pointlessly check and spew warnings
  fs: fix indentation style
  block: don't silently ignore metadata for sync read/write
  fs: add a FMODE_ flag to indicate IOCB_HAS_METADATA availability
  Please enter a commit message to explain why this merge is necessary,
  especially if it merges an updated upstream into a topic branch.

2 files changed, 16 insertions, 19 deletions

diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c
index 63ce708d93ed..e4b7c2b457ee 100644
--- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c
+++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test.c
@@ -2,6 +2,13 @@
 // Copyright (c) 2025 Miklos Szeredi <miklos@szeredi.hu>
 
 #define _GNU_SOURCE
+
+// Needed for linux/fanotify.h
+typedef struct {
+	int	val[2];
+} __kernel_fsid_t;
+#define __kernel_fsid_t __kernel_fsid_t
+
 #include <fcntl.h>
 #include <sched.h>
 #include <stdio.h>
@@ -10,20 +17,12 @@
 #include <sys/mount.h>
 #include <unistd.h>
 #include <sys/syscall.h>
+#include <sys/fanotify.h>
 
 #include "../../kselftest_harness.h"
 #include "../statmount/statmount.h"
 #include "../utils.h"
 
-// Needed for linux/fanotify.h
-#ifndef __kernel_fsid_t
-typedef struct {
-	int	val[2];
-} __kernel_fsid_t;
-#endif
-
-#include <sys/fanotify.h>
-
 static const char root_mntpoint_templ[] = "/tmp/mount-notify_test_root.XXXXXX";
 
 static const int mark_cmds[] = {
diff --git a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
index 090a5ca65004..9f57ca46e3af 100644
--- a/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
+++ b/tools/testing/selftests/filesystems/mount-notify/mount-notify_test_ns.c
@@ -2,6 +2,13 @@
 // Copyright (c) 2025 Miklos Szeredi <miklos@szeredi.hu>
 
 #define _GNU_SOURCE
+
+// Needed for linux/fanotify.h
+typedef struct {
+	int	val[2];
+} __kernel_fsid_t;
+#define __kernel_fsid_t __kernel_fsid_t
+
 #include <fcntl.h>
 #include <sched.h>
 #include <stdio.h>
@@ -10,21 +17,12 @@
 #include <sys/mount.h>
 #include <unistd.h>
 #include <sys/syscall.h>
+#include <sys/fanotify.h>
 
 #include "../../kselftest_harness.h"
-#include "../../pidfd/pidfd.h"
 #include "../statmount/statmount.h"
 #include "../utils.h"
 
-// Needed for linux/fanotify.h
-#ifndef __kernel_fsid_t
-typedef struct {
-	int	val[2];
-} __kernel_fsid_t;
-#endif
-
-#include <sys/fanotify.h>
-
 static const char root_mntpoint_templ[] = "/tmp/mount-notify_test_root.XXXXXX";
 
 static const int mark_types[] = {