Merge tag 'vfs-6.11.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "Features:

   - Support passing NULL along AT_EMPTY_PATH for statx().

     NULL paths with any flag value other than AT_EMPTY_PATH go the
     usual route and end up with -EFAULT to retain compatibility (Rust
     is abusing calls of the sort to detect availability of statx)

     This avoids path lookup code, lockref management, memory allocation
     and in case of NULL path userspace memory access (which can be
     quite expensive with SMAP on x86_64)

   - Don't block i_writecount during exec. Remove the
     deny_write_access() mechanism for executables

   - Relax open_by_handle_at() permissions in specific cases where we
     can prove that the caller had sufficient privileges to open a file

   - Switch timespec64 fields in struct inode to discrete integers
     freeing up 4 bytes

  Fixes:

   - Fix false positive circular locking warning in hfsplus

   - Initialize hfs_inode_info after hfs_alloc_inode() in hfs

   - Avoid accidental overflows in vfs_fallocate()

   - Don't interrupt fallocate with EINTR in tmpfs to avoid constantly
     restarting shmem_fallocate()

   - Add missing quote in comment in fs/readdir

  Cleanups:

   - Don't assign and test in an if statement in mqueue. Move the
     assignment out of the if statement

   - Reflow the logic in may_create_in_sticky()

   - Remove the usage of the deprecated ida_simple_xx() API from procfs

   - Reject FSCONFIG_CMD_CREATE_EXCL requets that depend on the new
     mount api early

   - Rename variables in copy_tree() to make it easier to understand

   - Replace WARN(down_read_trylock, ...) abuse with proper asserts in
     various places in the VFS

   - Get rid of user_path_at_empty() and drop the empty argument from
     getname_flags()

   - Check for error while copying and no path in one branch in
     getname_flags()

   - Avoid redundant smp_mb() for THP handling in do_dentry_open()

   - Rename parent_ino to d_parent_ino and make it use RCU

   - Remove unused header include in fs/readdir

   - Export in_group_capable() helper and switch f2fs and fuse over to
     it instead of open-coding the logic in both places"

* tag 'vfs-6.11.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (27 commits)
  ipc: mqueue: remove assignment from IS_ERR argument
  vfs: rename parent_ino to d_parent_ino and make it use RCU
  vfs: support statx(..., NULL, AT_EMPTY_PATH, ...)
  stat: use vfs_empty_path() helper
  fs: new helper vfs_empty_path()
  fs: reflow may_create_in_sticky()
  vfs: remove redundant smp_mb for thp handling in do_dentry_open
  fuse: Use in_group_or_capable() helper
  f2fs: Use in_group_or_capable() helper
  fs: Export in_group_or_capable()
  vfs: reorder checks in may_create_in_sticky
  hfs: fix to initialize fields of hfs_inode_info after hfs_alloc_inode()
  proc: Remove usage of the deprecated ida_simple_xx() API
  hfsplus: fix to avoid false alarm of circular locking
  Improve readability of copy_tree
  vfs: shave a branch in getname_flags
  vfs: retire user_path_at_empty and drop empty arg from getname_flags
  vfs: stop using user_path_at_empty in do_readlinkat
  tmpfs: don't interrupt fallocate with EINTR
  fs: don't block i_writecount during exec
  ...

2 files changed, 11 insertions, 8 deletions

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 774a97e6e2da..aab471791bd9 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2000,9 +2000,9 @@ out_unlock:
 	if (!is_shmem) {
 		filemap_nr_thps_inc(mapping);
 		/*
-		 * Paired with smp_mb() in do_dentry_open() to ensure
-		 * i_writecount is up to date and the update to nr_thps is
-		 * visible. Ensures the page cache will be truncated if the
+		 * Paired with the fence in do_dentry_open() -> get_write_access()
+		 * to ensure i_writecount is up to date and the update to nr_thps
+		 * is visible. Ensures the page cache will be truncated if the
 		 * file is opened writable.
 		 */
 		smp_mb();
@@ -2190,8 +2190,8 @@ rollback:
 	if (!is_shmem && result == SCAN_COPY_MC) {
 		filemap_nr_thps_dec(mapping);
 		/*
-		 * Paired with smp_mb() in do_dentry_open() to
-		 * ensure the update to nr_thps is visible.
+		 * Paired with the fence in do_dentry_open() -> get_write_access()
+		 * to ensure the update to nr_thps is visible.
 		 */
 		smp_mb();
 	}
diff --git a/mm/shmem.c b/mm/shmem.c
index c1befe046c7e..36de3da15426 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3177,10 +3177,13 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
 		struct folio *folio;
 
 		/*
-		 * Good, the fallocate(2) manpage permits EINTR: we may have
-		 * been interrupted because we are using up too much memory.
+		 * Check for fatal signal so that we abort early in OOM
+		 * situations. We don't want to abort in case of non-fatal
+		 * signals as large fallocate can take noticeable time and
+		 * e.g. periodic timers may result in fallocate constantly
+		 * restarting.
 		 */
-		if (signal_pending(current))
+		if (fatal_signal_pending(current))
 			error = -EINTR;
 		else if (shmem_falloc.nr_unswapped > shmem_falloc.nr_falloced)
 			error = -ENOMEM;