Merge tag 'vfs-6.10.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "This contains the usual miscellaneous features, cleanups, and fixes
  for vfs and individual fses.

  Features:

   - Free up FMODE_* bits. I've freed up bits 6, 7, 8, and 24. That
     means we now have six free FMODE_* bits in total (but bit #6
     already got used for FMODE_WRITE_RESTRICTED)

   - Add FOP_HUGE_PAGES flag (follow-up to FMODE_* cleanup)

   - Add fd_raw cleanup class so we can make use of automatic cleanup
     provided by CLASS(fd_raw, f)(fd) for O_PATH fds as well

   - Optimize seq_puts()

   - Simplify __seq_puts()

   - Add new anon_inode_getfile_fmode() api to allow specifying f_mode
     instead of open-coding it in multiple places

   - Annotate struct file_handle with __counted_by() and use
     struct_size()

   - Warn in get_file() whether f_count resurrection from zero is
     attempted (epoll/drm discussion)

   - Folio-sophize aio

   - Export the subvolume id in statx() for both btrfs and bcachefs

   - Relax linkat(AT_EMPTY_PATH) requirements

   - Add F_DUPFD_QUERY fcntl() allowing to compare two file descriptors
     for dup*() equality replacing kcmp()

  Cleanups:

   - Compile out swapfile inode checks when swap isn't enabled

   - Use (1 << n) notation for FMODE_* bitshifts for clarity

   - Remove redundant variable assignment in fs/direct-io

   - Cleanup uses of strncpy in orangefs

   - Speed up and cleanup writeback

   - Move fsparam_string_empty() helper into header since it's currently
     open-coded in multiple places

   - Add kernel-doc comments to proc_create_net_data_write()

   - Don't needlessly read dentry->d_flags twice

  Fixes:

   - Fix out-of-range warning in nilfs2

   - Fix ecryptfs overflow due to wrong encryption packet size
     calculation

   - Fix overly long line in xfs file_operations (follow-up to FMODE_*
     cleanup)

   - Don't raise FOP_BUFFER_{R,W}ASYNC for directories in xfs (follow-up
     to FMODE_* cleanup)

   - Don't call xfs_file_open from xfs_dir_open (follow-up to FMODE_*
     cleanup)

   - Fix stable offset api to prevent endless loops

   - Fix afs file server rotations

   - Prevent xattr node from overflowing the eraseblock in jffs2

   - Move fdinfo PTRACE_MODE_READ procfs check into the .permission()
     operation instead of .open() operation since this caused userspace
     regressions"

* tag 'vfs-6.10.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (39 commits)
  afs: Fix fileserver rotation getting stuck
  selftests: add F_DUPDFD_QUERY selftests
  fcntl: add F_DUPFD_QUERY fcntl()
  file: add fd_raw cleanup class
  fs: WARN when f_count resurrection is attempted
  seq_file: Simplify __seq_puts()
  seq_file: Optimize seq_puts()
  proc: Move fdinfo PTRACE_MODE_READ check into the inode .permission operation
  fs: Create anon_inode_getfile_fmode()
  xfs: don't call xfs_file_open from xfs_dir_open
  xfs: drop fop_flags for directories
  xfs: fix overly long line in the file_operations
  shmem: Fix shmem_rename2()
  libfs: Add simple_offset_rename() API
  libfs: Fix simple_offset_rename_exchange()
  jffs2: prevent xattr node from overflowing the eraseblock
  vfs, swap: compile out IS_SWAPFILE() on swapless configs
  vfs: relax linkat() AT_EMPTY_PATH - aka flink() - requirements
  fs/direct-io: remove redundant assignment to variable retval
  fs/dcache: Re-use value stored to dentry->d_flags instead of re-reading
  ...

30 files changed, 275 insertions, 174 deletions

diff --git a/fs/afs/rotate.c b/fs/afs/rotate.c
index ed04bd1eeae8..ed09d4d4c211 100644
--- a/fs/afs/rotate.c
+++ b/fs/afs/rotate.c
@@ -541,11 +541,13 @@ pick_server:
 		    test_bit(AFS_SE_EXCLUDED, &se->flags) ||
 		    !test_bit(AFS_SERVER_FL_RESPONDING, &s->flags))
 			continue;
-		es = op->server_states->endpoint_state;
+		es = op->server_states[i].endpoint_state;
 		sal = es->addresses;
 
 		afs_get_address_preferences_rcu(op->net, sal);
 		for (j = 0; j < sal->nr_addrs; j++) {
+			if (es->failed_set & (1 << j))
+				continue;
 			if (!sal->addrs[j].peer)
 				continue;
 			if (sal->addrs[j].prio > best_prio) {
@@ -605,6 +607,8 @@ iterate_address:
 	best_prio = -1;
 	addr_index = 0;
 	for (i = 0; i < alist->nr_addrs; i++) {
+		if (!(set & (1 << i)))
+			continue;
 		if (alist->addrs[i].prio > best_prio) {
 			addr_index = i;
 			best_prio = alist->addrs[i].prio;
@@ -674,7 +678,7 @@ no_more_servers:
 	for (i = 0; i < op->server_list->nr_servers; i++) {
 		struct afs_endpoint_state *estate;
 
-		estate = op->server_states->endpoint_state;
+		estate = op->server_states[i].endpoint_state;
 		error = READ_ONCE(estate->error);
 		if (error < 0)
 			afs_op_accumulate_error(op, error, estate->abort_code);
diff --git a/fs/aio.c b/fs/aio.c
index 0f4f531c9780..6ed5507cd330 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -122,7 +122,7 @@ struct kioctx {
 	unsigned long		mmap_base;
 	unsigned long		mmap_size;
 
-	struct page		**ring_pages;
+	struct folio		**ring_folios;
 	long			nr_pages;
 
 	struct rcu_work		free_rwork;	/* see free_ioctx() */
@@ -160,7 +160,7 @@ struct kioctx {
 		spinlock_t	completion_lock;
 	} ____cacheline_aligned_in_smp;
 
-	struct page		*internal_pages[AIO_RING_PAGES];
+	struct folio		*internal_folios[AIO_RING_PAGES];
 	struct file		*aio_ring_file;
 
 	unsigned		id;
@@ -334,19 +334,20 @@ static void aio_free_ring(struct kioctx *ctx)
 	put_aio_ring_file(ctx);
 
 	for (i = 0; i < ctx->nr_pages; i++) {
-		struct page *page;
-		pr_debug("pid(%d) [%d] page->count=%d\n", current->pid, i,
-				page_count(ctx->ring_pages[i]));
-		page = ctx->ring_pages[i];
-		if (!page)
+		struct folio *folio = ctx->ring_folios[i];
+
+		if (!folio)
 			continue;
-		ctx->ring_pages[i] = NULL;
-		put_page(page);
+
+		pr_debug("pid(%d) [%d] folio->count=%d\n", current->pid, i,
+			 folio_ref_count(folio));
+		ctx->ring_folios[i] = NULL;
+		folio_put(folio);
 	}
 
-	if (ctx->ring_pages && ctx->ring_pages != ctx->internal_pages) {
-		kfree(ctx->ring_pages);
-		ctx->ring_pages = NULL;
+	if (ctx->ring_folios && ctx->ring_folios != ctx->internal_folios) {
+		kfree(ctx->ring_folios);
+		ctx->ring_folios = NULL;
 	}
 }
 
@@ -441,7 +442,7 @@ static int aio_migrate_folio(struct address_space *mapping, struct folio *dst,
 	idx = src->index;
 	if (idx < (pgoff_t)ctx->nr_pages) {
 		/* Make sure the old folio hasn't already been changed */
-		if (ctx->ring_pages[idx] != &src->page)
+		if (ctx->ring_folios[idx] != src)
 			rc = -EAGAIN;
 	} else
 		rc = -EINVAL;
@@ -465,8 +466,8 @@ static int aio_migrate_folio(struct address_space *mapping, struct folio *dst,
 	 */
 	spin_lock_irqsave(&ctx->completion_lock, flags);
 	folio_migrate_copy(dst, src);
-	BUG_ON(ctx->ring_pages[idx] != &src->page);
-	ctx->ring_pages[idx] = &dst->page;
+	BUG_ON(ctx->ring_folios[idx] != src);
+	ctx->ring_folios[idx] = dst;
 	spin_unlock_irqrestore(&ctx->completion_lock, flags);
 
 	/* The old folio is no longer accessible. */
@@ -516,28 +517,30 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events)
 	nr_events = (PAGE_SIZE * nr_pages - sizeof(struct aio_ring))
 			/ sizeof(struct io_event);
 
-	ctx->ring_pages = ctx->internal_pages;
+	ctx->ring_folios = ctx->internal_folios;
 	if (nr_pages > AIO_RING_PAGES) {
-		ctx->ring_pages = kcalloc(nr_pages, sizeof(struct page *),
-					  GFP_KERNEL);
-		if (!ctx->ring_pages) {
+		ctx->ring_folios = kcalloc(nr_pages, sizeof(struct folio *),
+					   GFP_KERNEL);
+		if (!ctx->ring_folios) {
 			put_aio_ring_file(ctx);
 			return -ENOMEM;
 		}
 	}
 
 	for (i = 0; i < nr_pages; i++) {
-		struct page *page;
-		page = find_or_create_page(file->f_mapping,
-					   i, GFP_USER | __GFP_ZERO);
-		if (!page)
+		struct folio *folio;
+
+		folio = __filemap_get_folio(file->f_mapping, i,
+					    FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
+					    GFP_USER | __GFP_ZERO);
+		if (IS_ERR(folio))
 			break;
-		pr_debug("pid(%d) page[%d]->count=%d\n",
-			 current->pid, i, page_count(page));
-		SetPageUptodate(page);
-		unlock_page(page);
 
-		ctx->ring_pages[i] = page;
+		pr_debug("pid(%d) [%d] folio->count=%d\n", current->pid, i,
+			 folio_ref_count(folio));
+		folio_end_read(folio, true);
+
+		ctx->ring_folios[i] = folio;
 	}
 	ctx->nr_pages = i;
 
@@ -570,7 +573,7 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events)
 	ctx->user_id = ctx->mmap_base;
 	ctx->nr_events = nr_events; /* trusted copy */
 
-	ring = page_address(ctx->ring_pages[0]);
+	ring = folio_address(ctx->ring_folios[0]);
 	ring->nr = nr_events;	/* user copy */
 	ring->id = ~0U;
 	ring->head = ring->tail = 0;
@@ -578,7 +581,7 @@ static int aio_setup_ring(struct kioctx *ctx, unsigned int nr_events)
 	ring->compat_features = AIO_RING_COMPAT_FEATURES;
 	ring->incompat_features = AIO_RING_INCOMPAT_FEATURES;
 	ring->header_length = sizeof(struct aio_ring);
-	flush_dcache_page(ctx->ring_pages[0]);
+	flush_dcache_folio(ctx->ring_folios[0]);
 
 	return 0;
 }
@@ -689,9 +692,9 @@ static int ioctx_add_table(struct kioctx *ctx, struct mm_struct *mm)
 
 					/* While kioctx setup is in progress,
 					 * we are protected from page migration
-					 * changes ring_pages by ->ring_lock.
+					 * changes ring_folios by ->ring_lock.
 					 */
-					ring = page_address(ctx->ring_pages[0]);
+					ring = folio_address(ctx->ring_folios[0]);
 					ring->id = ctx->id;
 					return 0;
 				}
@@ -1033,7 +1036,7 @@ static void user_refill_reqs_available(struct kioctx *ctx)
 		 * against ctx->completed_events below will make sure we do the
 		 * safe/right thing.
 		 */
-		ring = page_address(ctx->ring_pages[0]);
+		ring = folio_address(ctx->ring_folios[0]);
 		head = ring->head;
 
 		refill_reqs_available(ctx, head, ctx->tail);
@@ -1145,12 +1148,12 @@ static void aio_complete(struct aio_kiocb *iocb)
 	if (++tail >= ctx->nr_events)
 		tail = 0;
 
-	ev_page = page_address(ctx->ring_pages[pos / AIO_EVENTS_PER_PAGE]);
+	ev_page = folio_address(ctx->ring_folios[pos / AIO_EVENTS_PER_PAGE]);
 	event = ev_page + pos % AIO_EVENTS_PER_PAGE;
 
 	*event = iocb->ki_res;
 
-	flush_dcache_page(ctx->ring_pages[pos / AIO_EVENTS_PER_PAGE]);
+	flush_dcache_folio(ctx->ring_folios[pos / AIO_EVENTS_PER_PAGE]);
 
 	pr_debug("%p[%u]: %p: %p %Lx %Lx %Lx\n", ctx, tail, iocb,
 		 (void __user *)(unsigned long)iocb->ki_res.obj,
@@ -1163,10 +1166,10 @@ static void aio_complete(struct aio_kiocb *iocb)
 
 	ctx->tail = tail;
 
-	ring = page_address(ctx->ring_pages[0]);
+	ring = folio_address(ctx->ring_folios[0]);
 	head = ring->head;
 	ring->tail = tail;
-	flush_dcache_page(ctx->ring_pages[0]);
+	flush_dcache_folio(ctx->ring_folios[0]);
 
 	ctx->completed_events++;
 	if (ctx->completed_events > 1)
@@ -1238,8 +1241,8 @@ static long aio_read_events_ring(struct kioctx *ctx,
 	sched_annotate_sleep();
 	mutex_lock(&ctx->ring_lock);
 
-	/* Access to ->ring_pages here is protected by ctx->ring_lock. */
-	ring = page_address(ctx->ring_pages[0]);
+	/* Access to ->ring_folios here is protected by ctx->ring_lock. */
+	ring = folio_address(ctx->ring_folios[0]);
 	head = ring->head;
 	tail = ring->tail;
 
@@ -1260,20 +1263,20 @@ static long aio_read_events_ring(struct kioctx *ctx,
 	while (ret < nr) {
 		long avail;
 		struct io_event *ev;
-		struct page *page;
+		struct folio *folio;
 
 		avail = (head <= tail ?  tail : ctx->nr_events) - head;
 		if (head == tail)
 			break;
 
 		pos = head + AIO_EVENTS_OFFSET;
-		page = ctx->ring_pages[pos / AIO_EVENTS_PER_PAGE];
+		folio = ctx->ring_folios[pos / AIO_EVENTS_PER_PAGE];
 		pos %= AIO_EVENTS_PER_PAGE;
 
 		avail = min(avail, nr - ret);
 		avail = min_t(long, avail, AIO_EVENTS_PER_PAGE - pos);
 
-		ev = page_address(page);
+		ev = folio_address(folio);
 		copy_ret = copy_to_user(event + ret, ev + pos,
 					sizeof(*ev) * avail);
 
@@ -1287,9 +1290,9 @@ static long aio_read_events_ring(struct kioctx *ctx,
 		head %= ctx->nr_events;
 	}
 
-	ring = page_address(ctx->ring_pages[0]);
+	ring = folio_address(ctx->ring_folios[0]);
 	ring->head = head;
-	flush_dcache_page(ctx->ring_pages[0]);
+	flush_dcache_folio(ctx->ring_folios[0]);
 
 	pr_debug("%li  h%u t%u\n", ret, head, tail);
 out:
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 0496cb5b6eab..42bd1cb7c9cd 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -149,6 +149,38 @@ struct file *anon_inode_getfile(const char *name,
 EXPORT_SYMBOL_GPL(anon_inode_getfile);
 
 /**
+ * anon_inode_getfile_fmode - creates a new file instance by hooking it up to an
+ *                      anonymous inode, and a dentry that describe the "class"
+ *                      of the file
+ *
+ * @name:    [in]    name of the "class" of the new file
+ * @fops:    [in]    file operations for the new file
+ * @priv:    [in]    private data for the new file (will be file's private_data)
+ * @flags:   [in]    flags
+ * @f_mode:  [in]    fmode
+ *
+ * Creates a new file by hooking it on a single inode. This is useful for files
+ * that do not need to have a full-fledged inode in order to operate correctly.
+ * All the files created with anon_inode_getfile() will share a single inode,
+ * hence saving memory and avoiding code duplication for the file/inode/dentry
+ * setup. Allows setting the fmode. Returns the newly created file* or an error
+ * pointer.
+ */
+struct file *anon_inode_getfile_fmode(const char *name,
+				const struct file_operations *fops,
+				void *priv, int flags, fmode_t f_mode)
+{
+	struct file *file;
+
+	file = __anon_inode_getfile(name, fops, priv, flags, NULL, false);
+	if (!IS_ERR(file))
+		file->f_mode |= f_mode;
+
+	return file;
+}
+EXPORT_SYMBOL_GPL(anon_inode_getfile_fmode);
+
+/**
  * anon_inode_create_getfile - Like anon_inode_getfile(), but creates a new
  *                             !S_PRIVATE anon inode rather than reuse the
  *                             singleton anon inode and calls the
@@ -271,6 +303,7 @@ int anon_inode_create_getfd(const char *name, const struct file_operations *fops
 	return __anon_inode_getfd(name, fops, priv, flags, context_inode, true);
 }
 
+
 static int __init anon_inode_init(void)
 {
 	anon_inode_mnt = kern_mount(&anon_inode_fs_type);
diff --git a/fs/bcachefs/fs.c b/fs/bcachefs/fs.c
index 6f114803c6f2..65b04b3c2679 100644
--- a/fs/bcachefs/fs.c
+++ b/fs/bcachefs/fs.c
@@ -844,6 +844,9 @@ static int bch2_getattr(struct mnt_idmap *idmap,
 	stat->blksize	= block_bytes(c);
 	stat->blocks	= inode->v.i_blocks;
 
+	stat->subvol	= inode->ei_subvol;
+	stat->result_mask |= STATX_SUBVOL;
+
 	if (request_mask & STATX_BTIME) {
 		stat->result_mask |= STATX_BTIME;
 		stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index f9d76072398d..1640c46f2153 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -3719,8 +3719,7 @@ static int btrfs_file_open(struct inode *inode, struct file *filp)
 {
 	int ret;
 
-	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | FMODE_BUF_WASYNC |
-		        FMODE_CAN_ODIRECT;
+	filp->f_mode |= FMODE_NOWAIT | FMODE_CAN_ODIRECT;
 
 	ret = fsverity_file_open(inode, filp);
 	if (ret)
@@ -3850,6 +3849,7 @@ const struct file_operations btrfs_file_operations = {
 	.compat_ioctl	= btrfs_compat_ioctl,
 #endif
 	.remap_file_range = btrfs_remap_file_range,
+	.fop_flags	= FOP_BUFFER_RASYNC | FOP_BUFFER_WASYNC,
 };
 
 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 7fed887e700c..f454ba349683 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8789,6 +8789,9 @@ static int btrfs_getattr(struct mnt_idmap *idmap,
 	generic_fillattr(idmap, request_mask, inode, stat);
 	stat->dev = BTRFS_I(inode)->root->anon_dev;
 
+	stat->subvol = BTRFS_I(inode)->root->root_key.objectid;
+	stat->result_mask |= STATX_SUBVOL;
+
 	spin_lock(&BTRFS_I(inode)->lock);
 	delalloc_bytes = BTRFS_I(inode)->new_delalloc_bytes;
 	inode_bytes = inode_get_bytes(inode);
diff --git a/fs/dcache.c b/fs/dcache.c
index 71a8e943a0fa..407095188f83 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -355,7 +355,7 @@ static inline void __d_clear_type_and_inode(struct dentry *dentry)
 	flags &= ~DCACHE_ENTRY_TYPE;
 	WRITE_ONCE(dentry->d_flags, flags);
 	dentry->d_inode = NULL;
-	if (dentry->d_flags & DCACHE_LRU_LIST)
+	if (flags & DCACHE_LRU_LIST)
 		this_cpu_inc(nr_dentry_negative);
 }
 
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 62c97ff9e852..b0aafe640fa4 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1217,7 +1217,6 @@ ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode,
 	 */
 	inode_dio_begin(inode);
 
-	retval = 0;
 	sdio.blkbits = blkbits;
 	sdio.blkfactor = i_blkbits - blkbits;
 	sdio.block_in_file = offset >> blkbits;
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index 3fe41964c0d8..7f9f68c00ef6 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -300,9 +300,11 @@ write_tag_66_packet(char *signature, u8 cipher_code,
 	 *         | Key Identifier Size      | 1 or 2 bytes |
 	 *         | Key Identifier           | arbitrary    |
 	 *         | File Encryption Key Size | 1 or 2 bytes |
+	 *         | Cipher Code              | 1 byte       |
 	 *         | File Encryption Key      | arbitrary    |
+	 *         | Checksum                 | 2 bytes      |
 	 */
-	data_len = (5 + ECRYPTFS_SIG_SIZE_HEX + crypt_stat->key_size);
+	data_len = (8 + ECRYPTFS_SIG_SIZE_HEX + crypt_stat->key_size);
 	*packet = kmalloc(data_len, GFP_KERNEL);
 	message = *packet;
 	if (!message) {
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 54d6ff22585c..28c51b0cc4db 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -885,8 +885,7 @@ static int ext4_file_open(struct inode *inode, struct file *filp)
 			return ret;
 	}
 
-	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC |
-			FMODE_DIO_PARALLEL_WRITE;
+	filp->f_mode |= FMODE_NOWAIT;
 	return dquot_file_open(inode, filp);
 }
 
@@ -938,7 +937,6 @@ const struct file_operations ext4_file_operations = {
 	.compat_ioctl	= ext4_compat_ioctl,
 #endif
 	.mmap		= ext4_file_mmap,
-	.mmap_supported_flags = MAP_SYNC,
 	.open		= ext4_file_open,
 	.release	= ext4_release_file,
 	.fsync		= ext4_sync_file,
@@ -946,6 +944,8 @@ const struct file_operations ext4_file_operations = {
 	.splice_read	= ext4_file_splice_read,
 	.splice_write	= iter_file_splice_write,
 	.fallocate	= ext4_fallocate,
+	.fop_flags	= FOP_MMAP_SYNC | FOP_BUFFER_RASYNC |
+			  FOP_DIO_PARALLEL_WRITE,
 };
 
 const struct inode_operations ext4_file_inode_operations = {
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 044135796f2b..3fce1b80c419 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1723,10 +1723,6 @@ static const struct constant_table ext4_param_dax[] = {
 	{}
 };
 
-/* String parameter that allows empty argument */
-#define fsparam_string_empty(NAME, OPT) \
-	__fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
-
 /*
  * Mount option specification
  * We don't use fsparam_flag_no because of the way we set the
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 1761ad125f97..2b65e09822d4 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -569,7 +569,7 @@ static int f2fs_file_open(struct inode *inode, struct file *filp)
 	if (err)
 		return err;
 
-	filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC;
+	filp->f_mode |= FMODE_NOWAIT;
 	filp->f_mode |= FMODE_CAN_ODIRECT;
 
 	return dquot_file_open(inode, filp);
@@ -5045,4 +5045,5 @@ const struct file_operations f2fs_file_operations = {
 	.splice_read	= f2fs_file_splice_read,
 	.splice_write	= iter_file_splice_write,
 	.fadvise	= f2fs_file_fadvise,
+	.fop_flags	= FOP_BUFFER_RASYNC,
 };
diff --git a/fs/fcntl.c b/fs/fcntl.c
index 54cc85d3338e..300e5d9ad913 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -327,6 +327,22 @@ static long fcntl_set_rw_hint(struct file *file, unsigned int cmd,
 	return 0;
 }
 
+/* Is the file descriptor a dup of the file? */
+static long f_dupfd_query(int fd, struct file *filp)
+{
+	CLASS(fd_raw, f)(fd);
+
+	/*
+	 * We can do the 'fdput()' immediately, as the only thing that
+	 * matters is the pointer value which isn't changed by the fdput.
+	 *
+	 * Technically we didn't need a ref at all, and 'fdget()' was
+	 * overkill, but given our lockless file pointer lookup, the
+	 * alternatives are complicated.
+	 */
+	return f.file == filp;
+}
+
 static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
 		struct file *filp)
 {
@@ -342,6 +358,9 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
 	case F_DUPFD_CLOEXEC:
 		err = f_dupfd(argi, filp, O_CLOEXEC);
 		break;
+	case F_DUPFD_QUERY:
+		err = f_dupfd_query(argi, filp);
+		break;
 	case F_GETFD:
 		err = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
 		break;
@@ -446,6 +465,7 @@ static int check_fcntl_cmd(unsigned cmd)
 	switch (cmd) {
 	case F_DUPFD:
 	case F_DUPFD_CLOEXEC:
+	case F_DUPFD_QUERY:
 	case F_GETFD:
 	case F_SETFD:
 	case F_GETFL:
diff --git a/fs/fhandle.c b/fs/fhandle.c
index 57a12614addf..8a7f86c2139a 100644
--- a/fs/fhandle.c
+++ b/fs/fhandle.c
@@ -36,7 +36,7 @@ static long do_sys_name_to_handle(const struct path *path,
 	if (f_handle.handle_bytes > MAX_HANDLE_SZ)
 		return -EINVAL;
 
-	handle = kzalloc(sizeof(struct file_handle) + f_handle.handle_bytes,
+	handle = kzalloc(struct_size(handle, f_handle, f_handle.handle_bytes),
 			 GFP_KERNEL);
 	if (!handle)
 		return -ENOMEM;
@@ -71,7 +71,7 @@ static long do_sys_name_to_handle(const struct path *path,
 	/* copy the mount id */
 	if (put_user(real_mount(path->mnt)->mnt_id, mnt_id) ||
 	    copy_to_user(ufh, handle,
-			 sizeof(struct file_handle) + handle_bytes))
+			 struct_size(handle, f_handle, handle_bytes)))
 		retval = -EFAULT;
 	kfree(handle);
 	return retval;
@@ -192,7 +192,7 @@ static int handle_to_path(int mountdirfd, struct file_handle __user *ufh,
 		retval = -EINVAL;
 		goto out_err;
 	}
-	handle = kmalloc(sizeof(struct file_handle) + f_handle.handle_bytes,
+	handle = kmalloc(struct_size(handle, f_handle, f_handle.handle_bytes),
 			 GFP_KERNEL);
 	if (!handle) {
 		retval = -ENOMEM;
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index e4f17c53ddfc..92a5b8283528 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -166,8 +166,7 @@ static void wb_wakeup_delayed(struct bdi_writeback *wb)
 	spin_unlock_irq(&wb->work_lock);
 }
 
-static void finish_writeback_work(struct bdi_writeback *wb,
-				  struct wb_writeback_work *work)
+static void finish_writeback_work(struct wb_writeback_work *work)
 {
 	struct wb_completion *done = work->done;
 
@@ -196,7 +195,7 @@ static void wb_queue_work(struct bdi_writeback *wb,
 		list_add_tail(&work->list, &wb->work_list);
 		mod_delayed_work(bdi_wq, &wb->dwork, 0);
 	} else
-		finish_writeback_work(wb, work);
+		finish_writeback_work(work);
 
 	spin_unlock_irq(&wb->work_lock);
 }
@@ -1561,7 +1560,8 @@ static void inode_sleep_on_writeback(struct inode *inode)
  * thread's back can have unexpected consequences.
  */
 static void requeue_inode(struct inode *inode, struct bdi_writeback *wb,
-			  struct writeback_control *wbc)
+			  struct writeback_control *wbc,
+			  unsigned long dirtied_before)
 {
 	if (inode->i_state & I_FREEING)
 		return;
@@ -1594,7 +1594,8 @@ static void requeue_inode(struct inode *inode, struct bdi_writeback *wb,
 		 * We didn't write back all the pages.  nfs_writepages()
 		 * sometimes bales out without doing anything.
 		 */
-		if (wbc->nr_to_write <= 0) {
+		if (wbc->nr_to_write <= 0 &&
+		    !inode_dirtied_after(inode, dirtied_before)) {
 			/* Slice used up. Queue for next turn. */
 			requeue_io(inode, wb);
 		} else {
@@ -1862,6 +1863,11 @@ static long writeback_sb_inodes(struct super_block *sb,
 	unsigned long start_time = jiffies;
 	long write_chunk;
 	long total_wrote = 0;  /* count both pages and inodes */
+	unsigned long dirtied_before = jiffies;
+
+	if (work->for_kupdate)
+		dirtied_before = jiffies -
+			msecs_to_jiffies(dirty_expire_interval * 10);
 
 	while (!list_empty(&wb->b_io)) {
 		struct inode *inode = wb_inode(wb->b_io.prev);
@@ -1967,7 +1973,7 @@ static long writeback_sb_inodes(struct super_block *sb,
 		spin_lock(&inode->i_lock);
 		if (!(inode->i_state & I_DIRTY_ALL))
 			total_wrote++;
-		requeue_inode(inode, tmp_wb, &wbc);
+		requeue_inode(inode, tmp_wb, &wbc, dirtied_before);
 		inode_sync_complete(inode);
 		spin_unlock(&inode->i_lock);
 
@@ -2069,6 +2075,7 @@ static long wb_writeback(struct bdi_writeback *wb,
 	struct inode *inode;
 	long progress;
 	struct blk_plug plug;
+	bool queued = false;
 
 	blk_start_plug(&plug);
 	for (;;) {
@@ -2098,21 +2105,24 @@ static long wb_writeback(struct bdi_writeback *wb,
 
 		spin_lock(&wb->list_lock);
 
-		/*
-		 * Kupdate and background works are special and we want to
-		 * include all inodes that need writing. Livelock avoidance is
-		 * handled by these works yielding to any other work so we are
-		 * safe.
-		 */
-		if (work->for_kupdate) {
-			dirtied_before = jiffies -
-				msecs_to_jiffies(dirty_expire_interval * 10);
-		} else if (work->for_background)
-			dirtied_before = jiffies;
-
 		trace_writeback_start(wb, work);
-		if (list_empty(&wb->b_io))
+		if (list_empty(&wb->b_io)) {
+			/*
+			 * Kupdate and background works are special and we want
+			 * to include all inodes that need writing. Livelock
+			 * avoidance is handled by these works yielding to any
+			 * other work so we are safe.
+			 */
+			if (work->for_kupdate) {
+				dirtied_before = jiffies -
+					msecs_to_jiffies(dirty_expire_interval *
+							 10);
+			} else if (work->for_background)
+				dirtied_before = jiffies;
+
 			queue_io(wb, work, dirtied_before);
+			queued = true;
+		}
 		if (work->sb)
 			progress = writeback_sb_inodes(work->sb, wb, work);
 		else
@@ -2127,7 +2137,7 @@ static long wb_writeback(struct bdi_writeback *wb,
 		 * mean the overall work is done. So we keep looping as long
 		 * as made some progress on cleaning pages or inodes.
 		 */
-		if (progress) {
+		if (progress || !queued) {
 			spin_unlock(&wb->list_lock);
 			continue;
 		}
@@ -2262,7 +2272,7 @@ static long wb_do_writeback(struct bdi_writeback *wb)
 	while ((work = get_next_work_item(wb)) != NULL) {
 		trace_writeback_exec(wb, work);
 		wrote += wb_writeback(wb, work);
-		finish_writeback_work(wb, work);
+		finish_writeback_work(work);
 	}
 
 	/*
@@ -2322,8 +2332,7 @@ void wb_workfn(struct work_struct *work)
 }
 
 /*
- * Start writeback of `nr_pages' pages on this bdi. If `nr_pages' is zero,
- * write back the whole world.
+ * Start writeback of all dirty pages on this bdi.
  */
 static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi,
 					 enum wb_reason reason)
@@ -2726,7 +2735,7 @@ EXPORT_SYMBOL(writeback_inodes_sb_nr);
  */
 void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason)
 {
-	return writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason);
+	writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason);
 }
 EXPORT_SYMBOL(writeback_inodes_sb);
 
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 6502c7e776d1..34ac73cc36b1 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -40,7 +40,7 @@
 #include <linux/sched/mm.h>
 
 static const struct address_space_operations hugetlbfs_aops;
-const struct file_operations hugetlbfs_file_operations;
+static const struct file_operations hugetlbfs_file_operations;
 static const struct inode_operations hugetlbfs_dir_inode_operations;
 static const struct inode_operations hugetlbfs_inode_operations;
 
@@ -1301,13 +1301,14 @@ static void init_once(void *foo)
 	inode_init_once(&ei->vfs_inode);
 }
 
-const struct file_operations hugetlbfs_file_operations = {
+static const struct file_operations hugetlbfs_file_operations = {
 	.read_iter		= hugetlbfs_read_iter,
 	.mmap			= hugetlbfs_file_mmap,
 	.fsync			= noop_fsync,
 	.get_unmapped_area	= hugetlb_get_unmapped_area,
 	.llseek			= default_llseek,
 	.fallocate		= hugetlbfs_fallocate,
+	.fop_flags		= FOP_HUGE_PAGES,
 };
 
 static const struct inode_operations hugetlbfs_dir_inode_operations = {
diff --git a/fs/jffs2/xattr.c b/fs/jffs2/xattr.c
index 00224f3a8d6e..defb4162c3d5 100644
--- a/fs/jffs2/xattr.c
+++ b/fs/jffs2/xattr.c
@@ -1110,6 +1110,9 @@ int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
 		return rc;
 
 	request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
+	if (request > c->sector_size - c->cleanmarker_size)
+		return -ERANGE;
+
 	rc = jffs2_reserve_space(c, request, &length,
 				 ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
 	if (rc) {
diff --git a/fs/libfs.c b/fs/libfs.c
index 3a6f2cb364f8..b635ee5adbcc 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -295,6 +295,18 @@ int simple_offset_add(struct offset_ctx *octx, struct dentry *dentry)
 	return 0;
 }
 
+static int simple_offset_replace(struct offset_ctx *octx, struct dentry *dentry,
+				 long offset)
+{
+	int ret;
+
+	ret = mtree_store(&octx->mt, offset, dentry, GFP_KERNEL);
+	if (ret)
+		return ret;
+	offset_set(dentry, offset);
+	return 0;
+}
+
 /**
  * simple_offset_remove - Remove an entry to a directory's offset map
  * @octx: directory offset ctx to be updated
@@ -346,12 +358,45 @@ int simple_offset_empty(struct dentry *dentry)
 }
 
 /**
+ * simple_offset_rename - handle directory offsets for rename
+ * @old_dir: parent directory of source entry
+ * @old_dentry: dentry of source entry
+ * @new_dir: parent_directory of destination entry
+ * @new_dentry: dentry of destination
+ *
+ * Caller provides appropriate serialization.
+ *
+ * User space expects the directory offset value of the replaced
+ * (new) directory entry to be unchanged after a rename.
+ *
+ * Returns zero on success, a negative errno value on failure.
+ */
+int simple_offset_rename(struct inode *old_dir, struct dentry *old_dentry,
+			 struct inode *new_dir, struct dentry *new_dentry)
+{
+	struct offset_ctx *old_ctx = old_dir->i_op->get_offset_ctx(old_dir);
+	struct offset_ctx *new_ctx = new_dir->i_op->get_offset_ctx(new_dir);
+	long new_offset = dentry2offset(new_dentry);
+
+	simple_offset_remove(old_ctx, old_dentry);
+
+	if (new_offset) {
+		offset_set(new_dentry, 0);
+		return simple_offset_replace(new_ctx, old_dentry, new_offset);
+	}
+	return simple_offset_add(new_ctx, old_dentry);
+}
+
+/**
  * simple_offset_rename_exchange - exchange rename with directory offsets
  * @old_dir: parent of dentry being moved
  * @old_dentry: dentry being moved
  * @new_dir: destination parent
  * @new_dentry: destination dentry
  *
+ * This API preserves the directory offset values. Caller provides
+ * appropriate serialization.
+ *
  * Returns zero on success. Otherwise a negative errno is returned and the
  * rename is rolled back.
  */
@@ -369,11 +414,11 @@ int simple_offset_rename_exchange(struct inode *old_dir,
 	simple_offset_remove(old_ctx, old_dentry);
 	simple_offset_remove(new_ctx, new_dentry);
 
-	ret = simple_offset_add(new_ctx, old_dentry);
+	ret = simple_offset_replace(new_ctx, old_dentry, new_index);
 	if (ret)
 		goto out_restore;
 
-	ret = simple_offset_add(old_ctx, new_dentry);
+	ret = simple_offset_replace(old_ctx, new_dentry, old_index);
 	if (ret) {
 		simple_offset_remove(new_ctx, old_dentry);
 		goto out_restore;
@@ -388,10 +433,8 @@ int simple_offset_rename_exchange(struct inode *old_dir,
 	return 0;
 
 out_restore:
-	offset_set(old_dentry, old_index);
-	mtree_store(&old_ctx->mt, old_index, old_dentry, GFP_KERNEL);
-	offset_set(new_dentry, new_index);
-	mtree_store(&new_ctx->mt, new_index, new_dentry, GFP_KERNEL);
+	(void)simple_offset_replace(old_ctx, old_dentry, old_index);
+	(void)simple_offset_replace(new_ctx, new_dentry, new_index);
 	return ret;
 }
 
diff --git a/fs/namei.c b/fs/namei.c
index c5b2a25be7d0..cb5dde0e309f 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2422,6 +2422,14 @@ static const char *path_init(struct nameidata *nd, unsigned flags)
 		if (!f.file)
 			return ERR_PTR(-EBADF);
 
+		if (flags & LOOKUP_LINKAT_EMPTY) {
+			if (f.file->f_cred != current_cred() &&
+			    !ns_capable(f.file->f_cred->user_ns, CAP_DAC_READ_SEARCH)) {
+				fdput(f);
+				return ERR_PTR(-ENOENT);
+			}
+		}
+
 		dentry = f.file->f_path.dentry;
 
 		if (*s && unlikely(!d_can_lookup(dentry))) {
@@ -4641,14 +4649,13 @@ int do_linkat(int olddfd, struct filename *old, int newdfd,
 		goto out_putnames;
 	}
 	/*
-	 * To use null names we require CAP_DAC_READ_SEARCH
+	 * To use null names we require CAP_DAC_READ_SEARCH or
+	 * that the open-time creds of the dfd matches current.
 	 * This ensures that not everyone will be able to create
-	 * handlink using the passed filedescriptor.
+	 * a hardlink using the passed file descriptor.
 	 */
-	if (flags & AT_EMPTY_PATH && !capable(CAP_DAC_READ_SEARCH)) {
-		error = -ENOENT;
-		goto out_putnames;
-	}
+	if (flags & AT_EMPTY_PATH)
+		how |= LOOKUP_LINKAT_EMPTY;
 
 	if (flags & AT_SYMLINK_FOLLOW)
 		how |= LOOKUP_FOLLOW;
diff --git a/fs/nilfs2/ioctl.c b/fs/nilfs2/ioctl.c
index f1a01c191cf5..8be471ce4f19 100644
--- a/fs/nilfs2/ioctl.c
+++ b/fs/nilfs2/ioctl.c
@@ -60,7 +60,7 @@ static int nilfs_ioctl_wrap_copy(struct the_nilfs *nilfs,
 	if (argv->v_nmembs == 0)
 		return 0;
 
-	if (argv->v_size > PAGE_SIZE)
+	if ((size_t)argv->v_size > PAGE_SIZE)
 		return -EINVAL;
 
 	/*
diff --git a/fs/orangefs/dcache.c b/fs/orangefs/dcache.c
index 8bbe9486e3a6..395a00ed8ac7 100644
--- a/fs/orangefs/dcache.c
+++ b/fs/orangefs/dcache.c
@@ -33,9 +33,7 @@ static int orangefs_revalidate_lookup(struct dentry *dentry)
 
 	new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW;
 	new_op->upcall.req.lookup.parent_refn = parent->refn;
-	strncpy(new_op->upcall.req.lookup.d_name,
-		dentry->d_name.name,
-		ORANGEFS_NAME_MAX - 1);
+	strscpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name);
 
 	gossip_debug(GOSSIP_DCACHE_DEBUG,
 		     "%s:%s:%d interrupt flag [%d]\n",
diff --git a/fs/orangefs/namei.c b/fs/orangefs/namei.c
index c9dfd5c6a097..200558ec72f0 100644
--- a/fs/orangefs/namei.c
+++ b/fs/orangefs/namei.c
@@ -41,8 +41,7 @@ static int orangefs_create(struct mnt_idmap *idmap,
 	fill_default_sys_attrs(new_op->upcall.req.create.attributes,
 			       ORANGEFS_TYPE_METAFILE, mode);
 
-	strncpy(new_op->upcall.req.create.d_name,
-		dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
+	strscpy(new_op->upcall.req.create.d_name, dentry->d_name.name);
 
 	ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
 
@@ -137,8 +136,7 @@ static struct dentry *orangefs_lookup(struct inode *dir, struct dentry *dentry,
 		     &parent->refn.khandle);
 	new_op->upcall.req.lookup.parent_refn = parent->refn;
 
-	strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name,
-		ORANGEFS_NAME_MAX - 1);
+	strscpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name);
 
 	gossip_debug(GOSSIP_NAME_DEBUG,
 		     "%s: doing lookup on %s under %pU,%d\n",
@@ -192,8 +190,7 @@ static int orangefs_unlink(struct inode *dir, struct dentry *dentry)
 		return -ENOMEM;
 
 	new_op->upcall.req.remove.parent_refn = parent->refn;
-	strncpy(new_op->upcall.req.remove.d_name, dentry->d_name.name,
-		ORANGEFS_NAME_MAX - 1);
+	strscpy(new_op->upcall.req.remove.d_name, dentry->d_name.name);
 
 	ret = service_operation(new_op, "orangefs_unlink",
 				get_interruptible_flag(inode));
@@ -247,10 +244,8 @@ static int orangefs_symlink(struct mnt_idmap *idmap,
 			       ORANGEFS_TYPE_SYMLINK,
 			       mode);
 
-	strncpy(new_op->upcall.req.sym.entry_name,
-		dentry->d_name.name,
-		ORANGEFS_NAME_MAX - 1);
-	strncpy(new_op->upcall.req.sym.target, symname, ORANGEFS_NAME_MAX - 1);
+	strscpy(new_op->upcall.req.sym.entry_name, dentry->d_name.name);
+	strscpy(new_op->upcall.req.sym.target, symname);
 
 	ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
 
@@ -324,8 +319,7 @@ static int orangefs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	fill_default_sys_attrs(new_op->upcall.req.mkdir.attributes,
 			      ORANGEFS_TYPE_DIRECTORY, mode);
 
-	strncpy(new_op->upcall.req.mkdir.d_name,
-		dentry->d_name.name, ORANGEFS_NAME_MAX - 1);
+	strscpy(new_op->upcall.req.mkdir.d_name, dentry->d_name.name);
 
 	ret = service_operation(new_op, __func__, get_interruptible_flag(dir));
 
@@ -405,12 +399,8 @@ static int orangefs_rename(struct mnt_idmap *idmap,
 	new_op->upcall.req.rename.old_parent_refn = ORANGEFS_I(old_dir)->refn;
 	new_op->upcall.req.rename.new_parent_refn = ORANGEFS_I(new_dir)->refn;
 
-	strncpy(new_op->upcall.req.rename.d_old_name,
-		old_dentry->d_name.name,
-		ORANGEFS_NAME_MAX - 1);
-	strncpy(new_op->upcall.req.rename.d_new_name,
-		new_dentry->d_name.name,
-		ORANGEFS_NAME_MAX - 1);
+	strscpy(new_op->upcall.req.rename.d_old_name, old_dentry->d_name.name);
+	strscpy(new_op->upcall.req.rename.d_new_name, new_dentry->d_name.name);
 
 	ret = service_operation(new_op,
 				"orangefs_rename",
diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c
index 34849b4a3243..fb4d09c2f531 100644
--- a/fs/orangefs/super.c
+++ b/fs/orangefs/super.c
@@ -253,9 +253,8 @@ int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
 	new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
 	if (!new_op)
 		return -ENOMEM;
-	strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
-		orangefs_sb->devname,
-		ORANGEFS_MAX_SERVER_ADDR_LEN);
+	strscpy(new_op->upcall.req.fs_mount.orangefs_config_server,
+		orangefs_sb->devname);
 
 	gossip_debug(GOSSIP_SUPER_DEBUG,
 		     "Attempting ORANGEFS Remount via host %s\n",
@@ -400,8 +399,7 @@ static int orangefs_unmount(int id, __s32 fs_id, const char *devname)
 		return -ENOMEM;
 	op->upcall.req.fs_umount.id = id;
 	op->upcall.req.fs_umount.fs_id = fs_id;
-	strncpy(op->upcall.req.fs_umount.orangefs_config_server,
-	    devname, ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
+	strscpy(op->upcall.req.fs_umount.orangefs_config_server, devname);
 	r = service_operation(op, "orangefs_fs_umount", 0);
 	/* Not much to do about an error here. */
 	if (r)
@@ -494,9 +492,7 @@ struct dentry *orangefs_mount(struct file_system_type *fst,
 	if (!new_op)
 		return ERR_PTR(-ENOMEM);
 
-	strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
-		devname,
-		ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
+	strscpy(new_op->upcall.req.fs_mount.orangefs_config_server, devname);
 
 	gossip_debug(GOSSIP_SUPER_DEBUG,
 		     "Attempting ORANGEFS Mount via host %s\n",
@@ -543,9 +539,8 @@ struct dentry *orangefs_mount(struct file_system_type *fst,
 	 * on successful mount, store the devname and data
 	 * used
 	 */
-	strncpy(ORANGEFS_SB(sb)->devname,
-		devname,
-		ORANGEFS_MAX_SERVER_ADDR_LEN - 1);
+	strscpy(ORANGEFS_SB(sb)->devname, devname);
+
 
 	/* mount_pending must be cleared */
 	ORANGEFS_SB(sb)->mount_pending = 0;
diff --git a/fs/overlayfs/params.c b/fs/overlayfs/params.c
index 36dcc530ac28..4860fcc4611b 100644
--- a/fs/overlayfs/params.c
+++ b/fs/overlayfs/params.c
@@ -139,10 +139,6 @@ static int ovl_verity_mode_def(void)
 	return OVL_VERITY_OFF;
 }
 
-#define fsparam_string_empty(NAME, OPT) \
-	__fsparam(fs_param_is_string, NAME, OPT, fs_param_can_be_empty, NULL)
-
-
 const struct fs_parameter_spec ovl_parameter_spec[] = {
 	fsparam_string_empty("lowerdir",    Opt_lowerdir),
 	fsparam_string("lowerdir+",         Opt_lowerdir_add),
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 6e72e5ad42bc..f4b1c8b42a51 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -74,7 +74,18 @@ out:
 	return 0;
 }
 
-static int proc_fdinfo_access_allowed(struct inode *inode)
+static int seq_fdinfo_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, seq_show, inode);
+}
+
+/**
+ * Shared /proc/pid/fdinfo and /proc/pid/fdinfo/fd permission helper to ensure
+ * that the current task has PTRACE_MODE_READ in addition to the normal
+ * POSIX-like checks.
+ */
+static int proc_fdinfo_permission(struct mnt_idmap *idmap, struct inode *inode,
+				  int mask)
 {
 	bool allowed = false;
 	struct task_struct *task = get_proc_task(inode);
@@ -88,18 +99,13 @@ static int proc_fdinfo_access_allowed(struct inode *inode)
 	if (!allowed)
 		return -EACCES;
 
-	return 0;
+	return generic_permission(idmap, inode, mask);
 }
 
-static int seq_fdinfo_open(struct inode *inode, struct file *file)
-{
-	int ret = proc_fdinfo_access_allowed(inode);
-
-	if (ret)
-		return ret;
-
-	return single_open(file, seq_show, inode);
-}
+static const struct inode_operations proc_fdinfo_file_inode_operations = {
+	.permission	= proc_fdinfo_permission,
+	.setattr	= proc_setattr,
+};
 
 static const struct file_operations proc_fdinfo_file_operations = {
 	.open		= seq_fdinfo_open,
@@ -388,6 +394,8 @@ static struct dentry *proc_fdinfo_instantiate(struct dentry *dentry,
 	ei = PROC_I(inode);
 	ei->fd = data->fd;
 
+	inode->i_op = &proc_fdinfo_file_inode_operations;
+
 	inode->i_fop = &proc_fdinfo_file_operations;
 	tid_fd_update_inode(task, inode, 0);
 
@@ -407,23 +415,13 @@ static int proc_readfdinfo(struct file *file, struct dir_context *ctx)
 				  proc_fdinfo_instantiate);
 }
 
-static int proc_open_fdinfo(struct inode *inode, struct file *file)
-{
-	int ret = proc_fdinfo_access_allowed(inode);
-
-	if (ret)
-		return ret;
-
-	return 0;
-}
-
 const struct inode_operations proc_fdinfo_inode_operations = {
 	.lookup		= proc_lookupfdinfo,
+	.permission	= proc_fdinfo_permission,
 	.setattr	= proc_setattr,
 };
 
 const struct file_operations proc_fdinfo_operations = {
-	.open		= proc_open_fdinfo,
 	.read		= generic_read_dir,
 	.iterate_shared	= proc_readfdinfo,
 	.llseek		= generic_file_llseek,
diff --git a/fs/proc/proc_net.c b/fs/proc/proc_net.c
index 2ba31b6d68c0..52f0b75cbce2 100644
--- a/fs/proc/proc_net.c
+++ b/fs/proc/proc_net.c
@@ -135,6 +135,7 @@ EXPORT_SYMBOL_GPL(proc_create_net_data);
  * @parent: The parent directory in which to create.
  * @ops: The seq_file ops with which to read the file.
  * @write: The write method with which to 'modify' the file.
+ * @state_size: The size of the per-file private state to allocate.
  * @data: Data for retrieval by pde_data().
  *
  * Create a network namespaced proc file in the @parent directory with the
diff --git a/fs/read_write.c b/fs/read_write.c
index d4c036e82b6c..2115d1f40bd5 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1685,7 +1685,7 @@ int generic_write_checks_count(struct kiocb *iocb, loff_t *count)
 
 	if ((iocb->ki_flags & IOCB_NOWAIT) &&
 	    !((iocb->ki_flags & IOCB_DIRECT) ||
-	      (file->f_mode & FMODE_BUF_WASYNC)))
+	      (file->f_op->fop_flags & FOP_BUFFER_WASYNC)))
 		return -EINVAL;
 
 	return generic_write_check_limits(iocb->ki_filp, iocb->ki_pos, count);
diff --git a/fs/seq_file.c b/fs/seq_file.c
index f5fdaf3b1572..e676c8b0cf5d 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -669,18 +669,11 @@ void seq_putc(struct seq_file *m, char c)
 }
 EXPORT_SYMBOL(seq_putc);
 
-void seq_puts(struct seq_file *m, const char *s)
+void __seq_puts(struct seq_file *m, const char *s)
 {
-	int len = strlen(s);
-
-	if (m->count + len >= m->size) {
-		seq_set_overflow(m);
-		return;
-	}
-	memcpy(m->buf + m->count, s, len);
-	m->count += len;
+	seq_write(m, s, strlen(s));
 }
-EXPORT_SYMBOL(seq_puts);
+EXPORT_SYMBOL(__seq_puts);
 
 /**
  * seq_put_decimal_ull_width - A helper routine for putting decimal numbers
diff --git a/fs/stat.c b/fs/stat.c
index 77cdc69eb422..70bd3e888cfa 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -658,6 +658,7 @@ cp_statx(const struct kstat *stat, struct statx __user *buffer)
 	tmp.stx_mnt_id = stat->mnt_id;
 	tmp.stx_dio_mem_align = stat->dio_mem_align;
 	tmp.stx_dio_offset_align = stat->dio_offset_align;
+	tmp.stx_subvol = stat->subvol;
 
 	return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
 }
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 632653e00906..2ce302b4885f 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1230,8 +1230,7 @@ xfs_file_open(
 {
 	if (xfs_is_shutdown(XFS_M(inode->i_sb)))
 		return -EIO;
-	file->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC | FMODE_BUF_WASYNC |
-			FMODE_DIO_PARALLEL_WRITE | FMODE_CAN_ODIRECT;
+	file->f_mode |= FMODE_NOWAIT | FMODE_CAN_ODIRECT;
 	return generic_file_open(inode, file);
 }
 
@@ -1244,7 +1243,9 @@ xfs_dir_open(
 	unsigned int	mode;
 	int		error;
 
-	error = xfs_file_open(inode, file);
+	if (xfs_is_shutdown(ip->i_mount))
+		return -EIO;
+	error = generic_file_open(inode, file);
 	if (error)
 		return error;
 
@@ -1490,7 +1491,6 @@ const struct file_operations xfs_file_operations = {
 	.compat_ioctl	= xfs_file_compat_ioctl,
 #endif
 	.mmap		= xfs_file_mmap,
-	.mmap_supported_flags = MAP_SYNC,
 	.open		= xfs_file_open,
 	.release	= xfs_file_release,
 	.fsync		= xfs_file_fsync,
@@ -1498,6 +1498,8 @@ const struct file_operations xfs_file_operations = {
 	.fallocate	= xfs_file_fallocate,
 	.fadvise	= xfs_file_fadvise,
 	.remap_file_range = xfs_file_remap_range,
+	.fop_flags	= FOP_MMAP_SYNC | FOP_BUFFER_RASYNC |
+			  FOP_BUFFER_WASYNC | FOP_DIO_PARALLEL_WRITE,
 };
 
 const struct file_operations xfs_dir_file_operations = {