Merge tag 'vfs-6.13.file' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs file updates from Christian Brauner:
 "This contains changes the changes for files for this cycle:

   - Introduce a new reference counting mechanism for files.

     As atomic_inc_not_zero() is implemented with a try_cmpxchg() loop
     it has O(N^2) behaviour under contention with N concurrent
     operations and it is in a hot path in __fget_files_rcu().

     The rcuref infrastructures remedies this problem by using an
     unconditional increment relying on safe- and dead zones to make
     this work and requiring rcu protection for the data structure in
     question. This not just scales better it also introduces overflow
     protection.

     However, in contrast to generic rcuref, files require a memory
     barrier and thus cannot rely on *_relaxed() atomic operations and
     also require to be built on atomic_long_t as having massive amounts
     of reference isn't unheard of even if it is just an attack.

     This adds a file specific variant instead of making this a generic
     library.

     This has been tested by various people and it gives consistent
     improvement up to 3-5% on workloads with loads of threads.

   - Add a fastpath for find_next_zero_bit(). Skip 2-levels searching
     via find_next_zero_bit() when there is a free slot in the word that
     contains the next fd. This improves pts/blogbench-1.1.0 read by 8%
     and write by 4% on Intel ICX 160.

   - Conditionally clear full_fds_bits since it's very likely that a bit
     in full_fds_bits has been cleared during __clear_open_fds(). This
     improves pts/blogbench-1.1.0 read up to 13%, and write up to 5% on
     Intel ICX 160.

   - Get rid of all lookup_*_fdget_rcu() variants. They were used to
     lookup files without taking a reference count. That became invalid
     once files were switched to SLAB_TYPESAFE_BY_RCU and now we're
     always taking a reference count. Switch to an already existing
     helper and remove the legacy variants.

   - Remove pointless includes of <linux/fdtable.h>.

   - Avoid cmpxchg() in close_files() as nobody else has a reference to
     the files_struct at that point.

   - Move close_range() into fs/file.c and fold __close_range() into it.

   - Cleanup calling conventions of alloc_fdtable() and expand_files().

   - Merge __{set,clear}_close_on_exec() into one.

   - Make __set_open_fd() set cloexec as well instead of doing it in two
     separate steps"

* tag 'vfs-6.13.file' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  selftests: add file SLAB_TYPESAFE_BY_RCU recycling stressor
  fs: port files to file_ref
  fs: add file_ref
  expand_files(): simplify calling conventions
  make __set_open_fd() set cloexec state as well
  fs: protect backing files with rcu
  file.c: merge __{set,clear}_close_on_exec()
  alloc_fdtable(): change calling conventions.
  fs/file.c: add fast path in find_next_fd()
  fs/file.c: conditionally clear full_fds
  fs/file.c: remove sanity_check and add likely/unlikely in alloc_fd()
  move close_range(2) into fs/file.c, fold __close_range() into it
  close_files(): don't bother with xchg()
  remove pointless includes of <linux/fdtable.h>
  get rid of ...lookup...fdget_rcu() family

Author: torvalds

arch/powerpc/platforms/cell/spufs/coredump.c

@@ -73,9 +73,7 @@ static struct spu_context *coredump_next_context(int *fd)
 		return NULL;
 	*fd = n - 1;
 
-	rcu_read_lock();
-	file = lookup_fdget_rcu(*fd);
-	rcu_read_unlock();
+	file = fget_raw(*fd);
 	if (file) {
 		ctx = SPUFS_I(file_inode(file))->i_ctx;
 		get_spu_context(ctx);

drivers/gpu/drm/i915/gt/shmem_utils.c

@@ -40,7 +40,7 @@ struct file *shmem_create_from_object(struct drm_i915_gem_object *obj)
 
 	if (i915_gem_object_is_shmem(obj)) {
 		file = obj->base.filp;
-		atomic_long_inc(&file->f_count);
+		get_file(file);
 		return file;
 	}
 

drivers/gpu/drm/vmwgfx/ttm_object.c

@@ -471,7 +471,7 @@ void ttm_object_device_release(struct ttm_object_device **p_tdev)
  */
 static bool __must_check get_dma_buf_unless_doomed(struct dma_buf *dmabuf)
 {
-	return atomic_long_inc_not_zero(&dmabuf->file->f_count) != 0L;
+	return file_ref_get(&dmabuf->file->f_ref);
 }
 
 /**

fs/eventpoll.c

@@ -1003,7 +1003,7 @@ static struct file *epi_fget(const struct epitem *epi)
 	struct file *file;
 
 	file = epi->ffd.file;
-	if (!atomic_long_inc_not_zero(&file->f_count))
+	if (!file_ref_get(&file->f_ref))
 		file = NULL;
 	return file;
 }

fs/fcntl.c

@@ -12,7 +12,6 @@
 #include <linux/fs.h>
 #include <linux/filelock.h>
 #include <linux/file.h>
-#include <linux/fdtable.h>
 #include <linux/capability.h>
 #include <linux/dnotify.h>
 #include <linux/slab.h>