vfs-6.13-rc7.fixes

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Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull vfs fixes from Christian Brauner:

 - Relax assertions on failure to encode file handles

   The ->encode_fh() method can fail for various reasons. None of them
   warrant a WARN_ON().

 - Fix overlayfs file handle encoding by allowing encoding an fid from
   an inode without an alias

 - Make sure fuse_dir_open() handles FOPEN_KEEP_CACHE. If it's not
   specified fuse needs to invaludate the directory inode page cache

 - Fix qnx6 so it builds with gcc-15

 - Various fixes for netfslib and ceph and nfs filesystems:
     - Ignore silly rename files from afs and nfs when building header
       archives
     - Fix read result collection in netfslib with multiple subrequests
     - Handle ENOMEM for netfslib buffered reads
     - Fix oops in nfs_netfs_init_request()
     - Parse the secctx command immediately in cachefiles
     - Remove a redundant smp_rmb() in netfslib
     - Handle recursion in read retry in netfslib
     - Fix clearing of folio_queue
     - Fix missing cancellation of copy-to_cache when the cache for a
       file is temporarly disabled in netfslib

 - Sanity check the hfs root record

 - Fix zero padding data issues in concurrent write scenarios

 - Fix is_mnt_ns_file() after converting nsfs to path_from_stashed()

 - Fix missing declaration of init_files

 - Increase I/O priority when writing revoke records in jbd2

 - Flush filesystem device before updating tail sequence in jbd2

* tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (23 commits)
  ovl: support encoding fid from inode with no alias
  ovl: pass realinode to ovl_encode_real_fh() instead of realdentry
  fuse: respect FOPEN_KEEP_CACHE on opendir
  netfs: Fix is-caching check in read-retry
  netfs: Fix the (non-)cancellation of copy when cache is temporarily disabled
  netfs: Fix ceph copy to cache on write-begin
  netfs: Work around recursion by abandoning retry if nothing read
  netfs: Fix missing barriers by using clear_and_wake_up_bit()
  netfs: Remove redundant use of smp_rmb()
  cachefiles: Parse the "secctx" immediately
  nfs: Fix oops in nfs_netfs_init_request() when copying to cache
  netfs: Fix enomem handling in buffered reads
  netfs: Fix non-contiguous donation between completed reads
  kheaders: Ignore silly-rename files
  fs: relax assertions on failure to encode file handles
  fs: fix missing declaration of init_files
  fs: fix is_mnt_ns_file()
  iomap: fix zero padding data issue in concurrent append writes
  iomap: pass byte granular end position to iomap_add_to_ioend
  jbd2: flush filesystem device before updating tail sequence
  ...

fs/9p/vfs_addr.c

@@ -57,6 +57,8 @@ static void v9fs_issue_write(struct netfs_io_subrequest *subreq)
 	int err, len;
 
 	len = p9_client_write(fid, subreq->start, &subreq->io_iter, &err);
+	if (len > 0)
+		__set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
 	netfs_write_subrequest_terminated(subreq, len ?: err, false);
 }
 
@@ -80,8 +82,10 @@ static void v9fs_issue_read(struct netfs_io_subrequest *subreq)
 	if (pos + total >= i_size_read(rreq->inode))
 		__set_bit(NETFS_SREQ_HIT_EOF, &subreq->flags);
 
-	if (!err)
+	if (!err) {
 		subreq->transferred += total;
+		__set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
+	}
 
 	netfs_read_subreq_terminated(subreq, err, false);
 }

fs/afs/write.c

@@ -122,7 +122,7 @@ static void afs_issue_write_worker(struct work_struct *work)
 	if (subreq->debug_index == 3)
 		return netfs_write_subrequest_terminated(subreq, -ENOANO, false);
 
-	if (!test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) {
+	if (!subreq->retry_count) {
 		set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
 		return netfs_write_subrequest_terminated(subreq, -EAGAIN, false);
 	}
@@ -149,6 +149,9 @@ static void afs_issue_write_worker(struct work_struct *work)
 	afs_wait_for_operation(op);
 	ret = afs_put_operation(op);
 	switch (ret) {
+	case 0:
+		__set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
+		break;
 	case -EACCES:
 	case -EPERM:
 	case -ENOKEY:

fs/cachefiles/daemon.c

@@ -15,6 +15,7 @@
 #include <linux/namei.h>
 #include <linux/poll.h>
 #include <linux/mount.h>
+#include <linux/security.h>
 #include <linux/statfs.h>
 #include <linux/ctype.h>
 #include <linux/string.h>
@@ -576,7 +577,7 @@ static int cachefiles_daemon_dir(struct cachefiles_cache *cache, char *args)
  */
 static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)
 {
-	char *secctx;
+	int err;
 
 	_enter(",%s", args);
 
@@ -585,16 +586,16 @@ static int cachefiles_daemon_secctx(struct cachefiles_cache *cache, char *args)
 		return -EINVAL;
 	}
 
-	if (cache->secctx) {
+	if (cache->have_secid) {
 		pr_err("Second security context specified\n");
 		return -EINVAL;
 	}
 
-	secctx = kstrdup(args, GFP_KERNEL);
+	err = security_secctx_to_secid(args, strlen(args), &cache->secid);
-	if (!secctx)
+	if (err)
-		return -ENOMEM;
+		return err;
 
-	cache->secctx = secctx;
+	cache->have_secid = true;
 	return 0;
 }
 
@@ -820,7 +821,6 @@ static void cachefiles_daemon_unbind(struct cachefiles_cache *cache)
 	put_cred(cache->cache_cred);
 
 	kfree(cache->rootdirname);
-	kfree(cache->secctx);
 	kfree(cache->tag);
 
 	_leave("");

fs/cachefiles/internal.h

@@ -122,7 +122,6 @@ struct cachefiles_cache {
 #define CACHEFILES_STATE_CHANGED	3	/* T if state changed (poll trigger) */
 #define CACHEFILES_ONDEMAND_MODE	4	/* T if in on-demand read mode */
 	char				*rootdirname;	/* name of cache root directory */
-	char				*secctx;	/* LSM security context */
 	char				*tag;		/* cache binding tag */
 	refcount_t			unbind_pincount;/* refcount to do daemon unbind */
 	struct xarray			reqs;		/* xarray of pending on-demand requests */
@@ -130,6 +129,8 @@ struct cachefiles_cache {
 	struct xarray			ondemand_ids;	/* xarray for ondemand_id allocation */
 	u32				ondemand_id_next;
 	u32				msg_id_next;
+	u32				secid;		/* LSM security id */
+	bool				have_secid;	/* whether "secid" was set */
 };
 
 static inline bool cachefiles_in_ondemand_mode(struct cachefiles_cache *cache)

fs/cachefiles/security.c

@@ -18,7 +18,7 @@ int cachefiles_get_security_ID(struct cachefiles_cache *cache)
 	struct cred *new;
 	int ret;
 
-	_enter("{%s}", cache->secctx);
+	_enter("{%u}", cache->have_secid ? cache->secid : 0);
 
 	new = prepare_kernel_cred(current);
 	if (!new) {
@@ -26,8 +26,8 @@ int cachefiles_get_security_ID(struct cachefiles_cache *cache)
 		goto error;
 	}
 
-	if (cache->secctx) {
+	if (cache->have_secid) {
-		ret = set_security_override_from_ctx(new, cache->secctx);
+		ret = set_security_override(new, cache->secid);
 		if (ret < 0) {
 			put_cred(new);
 			pr_err("Security denies permission to nominate security context: error %d\n",

fs/file.c

@@ -22,6 +22,7 @@
 #include <linux/close_range.h>
 #include <linux/file_ref.h>
 #include <net/sock.h>
+#include <linux/init_task.h>
 
 #include "internal.h"
 

fs/fuse/dir.c

@@ -1681,6 +1681,8 @@ static int fuse_dir_open(struct inode *inode, struct file *file)
 		 */
 		if (ff->open_flags & (FOPEN_STREAM | FOPEN_NONSEEKABLE))
 			nonseekable_open(inode, file);
+		if (!(ff->open_flags & FOPEN_KEEP_CACHE))
+			invalidate_inode_pages2(inode->i_mapping);
 	}
 
 	return err;

fs/hfs/super.c

@@ -349,11 +349,13 @@ static int hfs_fill_super(struct super_block *sb, struct fs_context *fc)
 		goto bail_no_root;
 	res = hfs_cat_find_brec(sb, HFS_ROOT_CNID, &fd);
 	if (!res) {
-		if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
+		if (fd.entrylength != sizeof(rec.dir)) {
 			res =  -EIO;
 			goto bail_hfs_find;
 		}
 		hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
+		if (rec.type != HFS_CDR_DIR)
+			res = -EIO;
 	}
 	if (res)
 		goto bail_hfs_find;

fs/iomap/buffered-io.c

@@ -1774,7 +1774,8 @@ static bool iomap_can_add_to_ioend(struct iomap_writepage_ctx *wpc, loff_t pos)
  */
 static int iomap_add_to_ioend(struct iomap_writepage_ctx *wpc,
 		struct writeback_control *wbc, struct folio *folio,
-		struct inode *inode, loff_t pos, unsigned len)
+		struct inode *inode, loff_t pos, loff_t end_pos,
+		unsigned len)
 {
 	struct iomap_folio_state *ifs = folio->private;
 	size_t poff = offset_in_folio(folio, pos);
@@ -1793,15 +1794,60 @@ static int iomap_add_to_ioend(struct iomap_writepage_ctx *wpc,
 
 	if (ifs)
 		atomic_add(len, &ifs->write_bytes_pending);
+
+	/*
+	 * Clamp io_offset and io_size to the incore EOF so that ondisk
+	 * file size updates in the ioend completion are byte-accurate.
+	 * This avoids recovering files with zeroed tail regions when
+	 * writeback races with appending writes:
+	 *
+	 *    Thread 1:                  Thread 2:
+	 *    ------------               -----------
+	 *    write [A, A+B]
+	 *    update inode size to A+B
+	 *    submit I/O [A, A+BS]
+	 *                               write [A+B, A+B+C]
+	 *                               update inode size to A+B+C
+	 *    <I/O completes, updates disk size to min(A+B+C, A+BS)>
+	 *    <power failure>
+	 *
+	 *  After reboot:
+	 *    1) with A+B+C < A+BS, the file has zero padding in range
+	 *       [A+B, A+B+C]
+	 *
+	 *    |<     Block Size (BS)   >|
+	 *    |DDDDDDDDDDDD0000000000000|
+	 *    ^           ^        ^
+	 *    A          A+B     A+B+C
+	 *                       (EOF)
+	 *
+	 *    2) with A+B+C > A+BS, the file has zero padding in range
+	 *       [A+B, A+BS]
+	 *
+	 *    |<     Block Size (BS)   >|<     Block Size (BS)    >|
+	 *    |DDDDDDDDDDDD0000000000000|00000000000000000000000000|
+	 *    ^           ^             ^           ^
+	 *    A          A+B           A+BS       A+B+C
+	 *                             (EOF)
+	 *
+	 *    D = Valid Data
+	 *    0 = Zero Padding
+	 *
+	 * Note that this defeats the ability to chain the ioends of
+	 * appending writes.
+	 */
 	wpc->ioend->io_size += len;
+	if (wpc->ioend->io_offset + wpc->ioend->io_size > end_pos)
+		wpc->ioend->io_size = end_pos - wpc->ioend->io_offset;
+
 	wbc_account_cgroup_owner(wbc, folio, len);
 	return 0;
 }
 
 static int iomap_writepage_map_blocks(struct iomap_writepage_ctx *wpc,
 		struct writeback_control *wbc, struct folio *folio,
-		struct inode *inode, u64 pos, unsigned dirty_len,
+		struct inode *inode, u64 pos, u64 end_pos,
-		unsigned *count)
+		unsigned dirty_len, unsigned *count)
 {
 	int error;
 
@@ -1826,7 +1872,7 @@ static int iomap_writepage_map_blocks(struct iomap_writepage_ctx *wpc,
 			break;
 		default:
 			error = iomap_add_to_ioend(wpc, wbc, folio, inode, pos,
-					map_len);
+					end_pos, map_len);
 			if (!error)
 				(*count)++;
 			break;
@@ -1897,11 +1943,11 @@ static bool iomap_writepage_handle_eof(struct folio *folio, struct inode *inode,
 		 *    remaining memory is zeroed when mapped, and writes to that
 		 *    region are not written out to the file.
 		 *
-		 * Also adjust the writeback range to skip all blocks entirely
+		 * Also adjust the end_pos to the end of file and skip writeback
-		 * beyond i_size.
+		 * for all blocks entirely beyond i_size.
 		 */
 		folio_zero_segment(folio, poff, folio_size(folio));
-		*end_pos = round_up(isize, i_blocksize(inode));
+		*end_pos = isize;
 	}
 
 	return true;
@@ -1914,6 +1960,7 @@ static int iomap_writepage_map(struct iomap_writepage_ctx *wpc,
 	struct inode *inode = folio->mapping->host;
 	u64 pos = folio_pos(folio);
 	u64 end_pos = pos + folio_size(folio);
+	u64 end_aligned = 0;
 	unsigned count = 0;
 	int error = 0;
 	u32 rlen;
@@ -1955,9 +2002,10 @@ static int iomap_writepage_map(struct iomap_writepage_ctx *wpc,
 	/*
 	 * Walk through the folio to find dirty areas to write back.
 	 */
-	while ((rlen = iomap_find_dirty_range(folio, &pos, end_pos))) {
+	end_aligned = round_up(end_pos, i_blocksize(inode));
+	while ((rlen = iomap_find_dirty_range(folio, &pos, end_aligned))) {
 		error = iomap_writepage_map_blocks(wpc, wbc, folio, inode,
-				pos, rlen, &count);
+				pos, end_pos, rlen, &count);
 		if (error)
 			break;
 		pos += rlen;

fs/jbd2/commit.c

@@ -772,9 +772,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
 	/*
 	 * If the journal is not located on the file system device,
 	 * then we must flush the file system device before we issue
-	 * the commit record
+	 * the commit record and update the journal tail sequence.
 	 */
-	if (commit_transaction->t_need_data_flush &&
+	if ((commit_transaction->t_need_data_flush || update_tail) &&
 	    (journal->j_fs_dev != journal->j_dev) &&
 	    (journal->j_flags & JBD2_BARRIER))
 		blkdev_issue_flush(journal->j_fs_dev);

fs/jbd2/revoke.c

@@ -654,7 +654,7 @@ static void flush_descriptor(journal_t *journal,
 	set_buffer_jwrite(descriptor);
 	BUFFER_TRACE(descriptor, "write");
 	set_buffer_dirty(descriptor);
-	write_dirty_buffer(descriptor, REQ_SYNC);
+	write_dirty_buffer(descriptor, JBD2_JOURNAL_REQ_FLAGS);
 }
 #endif
 

fs/namespace.c

@@ -2055,9 +2055,15 @@ SYSCALL_DEFINE1(oldumount, char __user *, name)
 
 static bool is_mnt_ns_file(struct dentry *dentry)
 {
+	struct ns_common *ns;
+
 	/* Is this a proxy for a mount namespace? */
-	return dentry->d_op == &ns_dentry_operations &&
+	if (dentry->d_op != &ns_dentry_operations)
-	       dentry->d_fsdata == &mntns_operations;
+		return false;
+
+	ns = d_inode(dentry)->i_private;
+
+	return ns->ops == &mntns_operations;
 }
 
 struct ns_common *from_mnt_ns(struct mnt_namespace *mnt)

fs/netfs/buffered_read.c

@@ -275,22 +275,14 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq)
 			netfs_stat(&netfs_n_rh_download);
 			if (rreq->netfs_ops->prepare_read) {
 				ret = rreq->netfs_ops->prepare_read(subreq);
-				if (ret < 0) {
+				if (ret < 0)
-					atomic_dec(&rreq->nr_outstanding);
+					goto prep_failed;
-					netfs_put_subrequest(subreq, false,
-							     netfs_sreq_trace_put_cancel);
-					break;
-				}
 				trace_netfs_sreq(subreq, netfs_sreq_trace_prepare);
 			}
 
 			slice = netfs_prepare_read_iterator(subreq);
-			if (slice < 0) {
+			if (slice < 0)
-				atomic_dec(&rreq->nr_outstanding);
+				goto prep_iter_failed;
-				netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_cancel);
-				ret = slice;
-				break;
-			}
 
 			rreq->netfs_ops->issue_read(subreq);
 			goto done;
@@ -302,6 +294,8 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq)
 			trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
 			netfs_stat(&netfs_n_rh_zero);
 			slice = netfs_prepare_read_iterator(subreq);
+			if (slice < 0)
+				goto prep_iter_failed;
 			__set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
 			netfs_read_subreq_terminated(subreq, 0, false);
 			goto done;
@@ -310,6 +304,8 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq)
 		if (source == NETFS_READ_FROM_CACHE) {
 			trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
 			slice = netfs_prepare_read_iterator(subreq);
+			if (slice < 0)
+				goto prep_iter_failed;
 			netfs_read_cache_to_pagecache(rreq, subreq);
 			goto done;
 		}
@@ -318,6 +314,14 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq)
 		WARN_ON_ONCE(1);
 		break;
 
+	prep_iter_failed:
+		ret = slice;
+	prep_failed:
+		subreq->error = ret;
+		atomic_dec(&rreq->nr_outstanding);
+		netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_cancel);
+		break;
+
 	done:
 		size -= slice;
 		start += slice;

fs/netfs/direct_write.c

@@ -104,7 +104,6 @@ ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *
 		trace_netfs_rreq(wreq, netfs_rreq_trace_wait_ip);
 		wait_on_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS,
 			    TASK_UNINTERRUPTIBLE);
-		smp_rmb(); /* Read error/transferred after RIP flag */
 		ret = wreq->error;
 		if (ret == 0) {
 			ret = wreq->transferred;

fs/netfs/read_collect.c

@@ -62,10 +62,14 @@ static void netfs_unlock_read_folio(struct netfs_io_subrequest *subreq,
 		} else {
 			trace_netfs_folio(folio, netfs_folio_trace_read_done);
 		}
+
+		folioq_clear(folioq, slot);
 	} else {
 		// TODO: Use of PG_private_2 is deprecated.
 		if (test_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags))
 			netfs_pgpriv2_mark_copy_to_cache(subreq, rreq, folioq, slot);
+		else
+			folioq_clear(folioq, slot);
 	}
 
 	if (!test_bit(NETFS_RREQ_DONT_UNLOCK_FOLIOS, &rreq->flags)) {
@@ -77,8 +81,6 @@ static void netfs_unlock_read_folio(struct netfs_io_subrequest *subreq,
 			folio_unlock(folio);
 		}
 	}
-
-	folioq_clear(folioq, slot);
 }
 
 /*
@@ -247,16 +249,17 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq, bool was
 
 	/* Deal with the trickiest case: that this subreq is in the middle of a
 	 * folio, not touching either edge, but finishes first.  In such a
-	 * case, we donate to the previous subreq, if there is one, so that the
+	 * case, we donate to the previous subreq, if there is one and if it is
-	 * donation is only handled when that completes - and remove this
+	 * contiguous, so that the donation is only handled when that completes
-	 * subreq from the list.
+	 * - and remove this subreq from the list.
 	 *
 	 * If the previous subreq finished first, we will have acquired their
 	 * donation and should be able to unlock folios and/or donate nextwards.
 	 */
 	if (!subreq->consumed &&
 	    !prev_donated &&
-	    !list_is_first(&subreq->rreq_link, &rreq->subrequests)) {
+	    !list_is_first(&subreq->rreq_link, &rreq->subrequests) &&
+	    subreq->start == prev->start + prev->len) {
 		prev = list_prev_entry(subreq, rreq_link);
 		WRITE_ONCE(prev->next_donated, prev->next_donated + subreq->len);
 		subreq->start += subreq->len;
@@ -378,8 +381,7 @@ static void netfs_rreq_assess(struct netfs_io_request *rreq)
 	task_io_account_read(rreq->transferred);
 
 	trace_netfs_rreq(rreq, netfs_rreq_trace_wake_ip);
-	clear_bit_unlock(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
+	clear_and_wake_up_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
-	wake_up_bit(&rreq->flags, NETFS_RREQ_IN_PROGRESS);
 
 	trace_netfs_rreq(rreq, netfs_rreq_trace_done);
 	netfs_clear_subrequests(rreq, false);
@@ -438,7 +440,7 @@ void netfs_read_subreq_progress(struct netfs_io_subrequest *subreq,
 	     rreq->origin == NETFS_READPAGE ||
 	     rreq->origin == NETFS_READ_FOR_WRITE)) {
 		netfs_consume_read_data(subreq, was_async);
-		__clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags);
+		__set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
 	}
 }
 EXPORT_SYMBOL(netfs_read_subreq_progress);
@@ -497,7 +499,7 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq,
 		     rreq->origin == NETFS_READPAGE ||
 		     rreq->origin == NETFS_READ_FOR_WRITE)) {
 			netfs_consume_read_data(subreq, was_async);
-			__clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags);
+			__set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
 		}
 		rreq->transferred += subreq->transferred;
 	}
@@ -511,10 +513,13 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq,
 		} else {
 			trace_netfs_sreq(subreq, netfs_sreq_trace_short);
 			if (subreq->transferred > subreq->consumed) {
-				__set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
+				/* If we didn't read new data, abandon retry. */
-				__clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags);
+				if (subreq->retry_count &&
-				set_bit(NETFS_RREQ_NEED_RETRY, &rreq->flags);
+				    test_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags)) {
-			} else if (!__test_and_set_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags)) {
+					__set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
+					set_bit(NETFS_RREQ_NEED_RETRY, &rreq->flags);
+				}
+			} else if (test_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags)) {
 				__set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
 				set_bit(NETFS_RREQ_NEED_RETRY, &rreq->flags);
 			} else {

fs/netfs/read_pgpriv2.c

@@ -170,6 +170,10 @@ void netfs_pgpriv2_write_to_the_cache(struct netfs_io_request *rreq)
 
 	trace_netfs_write(wreq, netfs_write_trace_copy_to_cache);
 	netfs_stat(&netfs_n_wh_copy_to_cache);
+	if (!wreq->io_streams[1].avail) {
+		netfs_put_request(wreq, false, netfs_rreq_trace_put_return);
+		goto couldnt_start;
+	}
 
 	for (;;) {
 		error = netfs_pgpriv2_copy_folio(wreq, folio);

fs/netfs/read_retry.c

@@ -49,13 +49,15 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq)
 	 * up to the first permanently failed one.
 	 */
 	if (!rreq->netfs_ops->prepare_read &&
-	    !test_bit(NETFS_RREQ_COPY_TO_CACHE, &rreq->flags)) {
+	    !rreq->cache_resources.ops) {
 		struct netfs_io_subrequest *subreq;
 
 		list_for_each_entry(subreq, &rreq->subrequests, rreq_link) {
 			if (test_bit(NETFS_SREQ_FAILED, &subreq->flags))
 				break;
 			if (__test_and_clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags)) {
+				__clear_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
+				subreq->retry_count++;
 				netfs_reset_iter(subreq);
 				netfs_reissue_read(rreq, subreq);
 			}
@@ -137,7 +139,8 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq)
 			stream0->sreq_max_len = subreq->len;
 
 			__clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
-			__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
+			__clear_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
+			subreq->retry_count++;
 
 			spin_lock_bh(&rreq->lock);
 			list_add_tail(&subreq->rreq_link, &rreq->subrequests);
@@ -213,7 +216,6 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq)
 			subreq->error = -ENOMEM;
 		__clear_bit(NETFS_SREQ_FAILED, &subreq->flags);
 		__clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
-		__clear_bit(NETFS_SREQ_RETRYING, &subreq->flags);
 	}
 	spin_lock_bh(&rreq->lock);
 	list_splice_tail_init(&queue, &rreq->subrequests);

fs/netfs/write_collect.c

@@ -179,7 +179,6 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq,
 				struct iov_iter source = subreq->io_iter;
 
 				iov_iter_revert(&source, subreq->len - source.count);
-				__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
 				netfs_get_subrequest(subreq, netfs_sreq_trace_get_resubmit);
 				netfs_reissue_write(stream, subreq, &source);
 			}
@@ -234,7 +233,7 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq,
 			/* Renegotiate max_len (wsize) */
 			trace_netfs_sreq(subreq, netfs_sreq_trace_retry);
 			__clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags);
-			__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
+			subreq->retry_count++;
 			stream->prepare_write(subreq);
 
 			part = min(len, stream->sreq_max_len);
@@ -279,7 +278,7 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq,
 			subreq->start		= start;
 			subreq->debug_index	= atomic_inc_return(&wreq->subreq_counter);
 			subreq->stream_nr	= to->stream_nr;
-			__set_bit(NETFS_SREQ_RETRYING, &subreq->flags);
+			subreq->retry_count	= 1;
 
 			trace_netfs_sreq_ref(wreq->debug_id, subreq->debug_index,
 					     refcount_read(&subreq->ref),
@@ -501,8 +500,7 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq)
 		goto need_retry;
 	if ((notes & MADE_PROGRESS) && test_bit(NETFS_RREQ_PAUSE, &wreq->flags)) {
 		trace_netfs_rreq(wreq, netfs_rreq_trace_unpause);
-		clear_bit_unlock(NETFS_RREQ_PAUSE, &wreq->flags);
+		clear_and_wake_up_bit(NETFS_RREQ_PAUSE, &wreq->flags);
-		wake_up_bit(&wreq->flags, NETFS_RREQ_PAUSE);
 	}
 
 	if (notes & NEED_REASSESS) {
@@ -605,8 +603,7 @@ void netfs_write_collection_worker(struct work_struct *work)
 
 	_debug("finished");
 	trace_netfs_rreq(wreq, netfs_rreq_trace_wake_ip);
-	clear_bit_unlock(NETFS_RREQ_IN_PROGRESS, &wreq->flags);
+	clear_and_wake_up_bit(NETFS_RREQ_IN_PROGRESS, &wreq->flags);
-	wake_up_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS);
 
 	if (wreq->iocb) {
 		size_t written = min(wreq->transferred, wreq->len);
@@ -714,8 +711,7 @@ void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error,
 
 	trace_netfs_sreq(subreq, netfs_sreq_trace_terminated);
 
-	clear_bit_unlock(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
+	clear_and_wake_up_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
-	wake_up_bit(&subreq->flags, NETFS_SREQ_IN_PROGRESS);
 
 	/* If we are at the head of the queue, wake up the collector,
 	 * transferring a ref to it if we were the ones to do so.

fs/netfs/write_issue.c

@@ -244,6 +244,8 @@ void netfs_reissue_write(struct netfs_io_stream *stream,
 	iov_iter_advance(source, size);
 	iov_iter_truncate(&subreq->io_iter, size);
 
+	subreq->retry_count++;
+	__clear_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
 	__set_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags);
 	netfs_do_issue_write(stream, subreq);
 }

fs/nfs/fscache.c

@@ -263,6 +263,12 @@ int nfs_netfs_readahead(struct readahead_control *ractl)
 static atomic_t nfs_netfs_debug_id;
 static int nfs_netfs_init_request(struct netfs_io_request *rreq, struct file *file)
 {
+	if (!file) {
+		if (WARN_ON_ONCE(rreq->origin != NETFS_PGPRIV2_COPY_TO_CACHE))
+			return -EIO;
+		return 0;
+	}
+
 	rreq->netfs_priv = get_nfs_open_context(nfs_file_open_context(file));
 	rreq->debug_id = atomic_inc_return(&nfs_netfs_debug_id);
 	/* [DEPRECATED] Use PG_private_2 to mark folio being written to the cache. */
@@ -274,7 +280,8 @@ static int nfs_netfs_init_request(struct netfs_io_request *rreq, struct file *fi
 
 static void nfs_netfs_free_request(struct netfs_io_request *rreq)
 {
-	put_nfs_open_context(rreq->netfs_priv);
+	if (rreq->netfs_priv)
+		put_nfs_open_context(rreq->netfs_priv);
 }
 
 static struct nfs_netfs_io_data *nfs_netfs_alloc(struct netfs_io_subrequest *sreq)

fs/notify/fdinfo.c

@@ -47,10 +47,8 @@ static void show_mark_fhandle(struct seq_file *m, struct inode *inode)
 	size = f->handle_bytes >> 2;
 
 	ret = exportfs_encode_fid(inode, (struct fid *)f->f_handle, &size);
-	if ((ret == FILEID_INVALID) || (ret < 0)) {
+	if ((ret == FILEID_INVALID) || (ret < 0))
-		WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
 		return;
-	}
 
 	f->handle_type = ret;
 	f->handle_bytes = size * sizeof(u32);

fs/overlayfs/copy_up.c

@@ -415,13 +415,13 @@ int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upperdentry,
 	return err;
 }
 
-struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
+struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct inode *realinode,
 				  bool is_upper)
 {
 	struct ovl_fh *fh;
 	int fh_type, dwords;
 	int buflen = MAX_HANDLE_SZ;
-	uuid_t *uuid = &real->d_sb->s_uuid;
+	uuid_t *uuid = &realinode->i_sb->s_uuid;
 	int err;
 
 	/* Make sure the real fid stays 32bit aligned */
@@ -438,13 +438,13 @@ struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
 	 * the price or reconnecting the dentry.
 	 */
 	dwords = buflen >> 2;
-	fh_type = exportfs_encode_fh(real, (void *)fh->fb.fid, &dwords, 0);
+	fh_type = exportfs_encode_inode_fh(realinode, (void *)fh->fb.fid,
+					   &dwords, NULL, 0);
 	buflen = (dwords << 2);
 
 	err = -EIO;
-	if (WARN_ON(fh_type < 0) ||
+	if (fh_type < 0 || fh_type == FILEID_INVALID ||
-	    WARN_ON(buflen > MAX_HANDLE_SZ) ||
+	    WARN_ON(buflen > MAX_HANDLE_SZ))
-	    WARN_ON(fh_type == FILEID_INVALID))
 		goto out_err;
 
 	fh->fb.version = OVL_FH_VERSION;
@@ -480,7 +480,7 @@ struct ovl_fh *ovl_get_origin_fh(struct ovl_fs *ofs, struct dentry *origin)
 	if (!ovl_can_decode_fh(origin->d_sb))
 		return NULL;
 
-	return ovl_encode_real_fh(ofs, origin, false);
+	return ovl_encode_real_fh(ofs, d_inode(origin), false);
 }
 
 int ovl_set_origin_fh(struct ovl_fs *ofs, const struct ovl_fh *fh,
@@ -505,7 +505,7 @@ static int ovl_set_upper_fh(struct ovl_fs *ofs, struct dentry *upper,
 	const struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(ofs, upper, true);
+	fh = ovl_encode_real_fh(ofs, d_inode(upper), true);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 

fs/overlayfs/export.c

@@ -176,35 +176,37 @@ static int ovl_connect_layer(struct dentry *dentry)
  *
  * Return 0 for upper file handle, > 0 for lower file handle or < 0 on error.
  */
-static int ovl_check_encode_origin(struct dentry *dentry)
+static int ovl_check_encode_origin(struct inode *inode)
 {
-	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);
+	struct ovl_fs *ofs = OVL_FS(inode->i_sb);
 	bool decodable = ofs->config.nfs_export;
+	struct dentry *dentry;
+	int err;
 
 	/* No upper layer? */
 	if (!ovl_upper_mnt(ofs))
 		return 1;
 
 	/* Lower file handle for non-upper non-decodable */
-	if (!ovl_dentry_upper(dentry) && !decodable)
+	if (!ovl_inode_upper(inode) && !decodable)
 		return 1;
 
 	/* Upper file handle for pure upper */
-	if (!ovl_dentry_lower(dentry))
+	if (!ovl_inode_lower(inode))
 		return 0;
 
 	/*
 	 * Root is never indexed, so if there's an upper layer, encode upper for
 	 * root.
 	 */
-	if (dentry == dentry->d_sb->s_root)
+	if (inode == d_inode(inode->i_sb->s_root))
 		return 0;
 
 	/*
 	 * Upper decodable file handle for non-indexed upper.
 	 */
-	if (ovl_dentry_upper(dentry) && decodable &&
+	if (ovl_inode_upper(inode) && decodable &&
-	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))
+	    !ovl_test_flag(OVL_INDEX, inode))
 		return 0;
 
 	/*
@@ -213,14 +215,23 @@ static int ovl_check_encode_origin(struct dentry *dentry)
 	 * ovl_connect_layer() will try to make origin's layer "connected" by
 	 * copying up a "connectable" ancestor.
 	 */
-	if (d_is_dir(dentry) && decodable)
+	if (!decodable || !S_ISDIR(inode->i_mode))
-		return ovl_connect_layer(dentry);
+		return 1;
+
+	dentry = d_find_any_alias(inode);
+	if (!dentry)
+		return -ENOENT;
+
+	err = ovl_connect_layer(dentry);
+	dput(dentry);
+	if (err < 0)
+		return err;
 
 	/* Lower file handle for indexed and non-upper dir/non-dir */
 	return 1;
 }
 
-static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,
+static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct inode *inode,
 			     u32 *fid, int buflen)
 {
 	struct ovl_fh *fh = NULL;
@@ -231,13 +242,13 @@ static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,
 	 * Check if we should encode a lower or upper file handle and maybe
 	 * copy up an ancestor to make lower file handle connectable.
 	 */
-	err = enc_lower = ovl_check_encode_origin(dentry);
+	err = enc_lower = ovl_check_encode_origin(inode);
 	if (enc_lower < 0)
 		goto fail;
 
 	/* Encode an upper or lower file handle */
-	fh = ovl_encode_real_fh(ofs, enc_lower ? ovl_dentry_lower(dentry) :
+	fh = ovl_encode_real_fh(ofs, enc_lower ? ovl_inode_lower(inode) :
-				ovl_dentry_upper(dentry), !enc_lower);
+				ovl_inode_upper(inode), !enc_lower);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 
@@ -251,8 +262,8 @@ static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,
 	return err;
 
 fail:
-	pr_warn_ratelimited("failed to encode file handle (%pd2, err=%i)\n",
+	pr_warn_ratelimited("failed to encode file handle (ino=%lu, err=%i)\n",
-			    dentry, err);
+			    inode->i_ino, err);
 	goto out;
 }
 
@@ -260,19 +271,13 @@ static int ovl_encode_fh(struct inode *inode, u32 *fid, int *max_len,
 			 struct inode *parent)
 {
 	struct ovl_fs *ofs = OVL_FS(inode->i_sb);
-	struct dentry *dentry;
 	int bytes, buflen = *max_len << 2;
 
 	/* TODO: encode connectable file handles */
 	if (parent)
 		return FILEID_INVALID;
 
-	dentry = d_find_any_alias(inode);
+	bytes = ovl_dentry_to_fid(ofs, inode, fid, buflen);
-	if (!dentry)
-		return FILEID_INVALID;
-
-	bytes = ovl_dentry_to_fid(ofs, dentry, fid, buflen);
-	dput(dentry);
 	if (bytes <= 0)
 		return FILEID_INVALID;
 

fs/overlayfs/namei.c

@@ -542,7 +542,7 @@ int ovl_verify_origin_xattr(struct ovl_fs *ofs, struct dentry *dentry,
 	struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(ofs, real, is_upper);
+	fh = ovl_encode_real_fh(ofs, d_inode(real), is_upper);
 	err = PTR_ERR(fh);
 	if (IS_ERR(fh)) {
 		fh = NULL;
@@ -738,7 +738,7 @@ int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,
 	struct ovl_fh *fh;
 	int err;
 
-	fh = ovl_encode_real_fh(ofs, origin, false);
+	fh = ovl_encode_real_fh(ofs, d_inode(origin), false);
 	if (IS_ERR(fh))
 		return PTR_ERR(fh);
 

fs/overlayfs/overlayfs.h

@@ -865,7 +865,7 @@ int ovl_copy_up_with_data(struct dentry *dentry);
 int ovl_maybe_copy_up(struct dentry *dentry, int flags);
 int ovl_copy_xattr(struct super_block *sb, const struct path *path, struct dentry *new);
 int ovl_set_attr(struct ovl_fs *ofs, struct dentry *upper, struct kstat *stat);
-struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct dentry *real,
+struct ovl_fh *ovl_encode_real_fh(struct ovl_fs *ofs, struct inode *realinode,
 				  bool is_upper);
 struct ovl_fh *ovl_get_origin_fh(struct ovl_fs *ofs, struct dentry *origin);
 int ovl_set_origin_fh(struct ovl_fs *ofs, const struct ovl_fh *fh,

fs/qnx6/inode.c

@@ -179,8 +179,7 @@ static int qnx6_statfs(struct dentry *dentry, struct kstatfs *buf)
  */
 static const char *qnx6_checkroot(struct super_block *s)
 {
-	static char match_root[2][3] = {".\0\0", "..\0"};
+	int error = 0;
-	int i, error = 0;
 	struct qnx6_dir_entry *dir_entry;
 	struct inode *root = d_inode(s->s_root);
 	struct address_space *mapping = root->i_mapping;
@@ -189,11 +188,9 @@ static const char *qnx6_checkroot(struct super_block *s)
 	if (IS_ERR(folio))
 		return "error reading root directory";
 	dir_entry = kmap_local_folio(folio, 0);
-	for (i = 0; i < 2; i++) {
+	if (memcmp(dir_entry[0].de_fname, ".", 2) ||
-		/* maximum 3 bytes - due to match_root limitation */
+	    memcmp(dir_entry[1].de_fname, "..", 3))
-		if (strncmp(dir_entry[i].de_fname, match_root[i], 3))
+		error = 1;
-			error = 1;
-	}
 	folio_release_kmap(folio, dir_entry);
 	if (error)
 		return "error reading root directory.";

fs/smb/client/cifssmb.c

@@ -1319,14 +1319,16 @@ cifs_readv_callback(struct mid_q_entry *mid)
 	}
 
 	if (rdata->result == -ENODATA) {
-		__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
 		rdata->result = 0;
+		__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
 	} else {
 		size_t trans = rdata->subreq.transferred + rdata->got_bytes;
 		if (trans < rdata->subreq.len &&
 		    rdata->subreq.start + trans == ictx->remote_i_size) {
-			__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
 			rdata->result = 0;
+			__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
+		} else if (rdata->got_bytes > 0) {
+			__set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags);
 		}
 	}
 
@@ -1670,10 +1672,13 @@ cifs_writev_callback(struct mid_q_entry *mid)
 		if (written > wdata->subreq.len)
 			written &= 0xFFFF;
 
-		if (written < wdata->subreq.len)
+		if (written < wdata->subreq.len) {
 			result = -ENOSPC;
-		else
+		} else {
 			result = written;
+			if (written > 0)
+				__set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags);
+		}
 		break;
 	case MID_REQUEST_SUBMITTED:
 	case MID_RETRY_NEEDED:

fs/smb/client/smb2pdu.c

@@ -4615,6 +4615,7 @@ smb2_readv_callback(struct mid_q_entry *mid)
 			__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
 			rdata->result = 0;
 		}
+		__set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags);
 	}
 	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
 			      server->credits, server->in_flight,
@@ -4842,10 +4843,12 @@ smb2_writev_callback(struct mid_q_entry *mid)
 
 		cifs_stats_bytes_written(tcon, written);
 
-		if (written < wdata->subreq.len)
+		if (written < wdata->subreq.len) {
 			wdata->result = -ENOSPC;
-		else
+		} else if (written > 0) {
 			wdata->subreq.len = written;
+			__set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags);
+		}
 		break;
 	case MID_REQUEST_SUBMITTED:
 	case MID_RETRY_NEEDED:
@@ -5014,7 +5017,7 @@ smb2_async_writev(struct cifs_io_subrequest *wdata)
 	}
 #endif
 
-	if (test_bit(NETFS_SREQ_RETRYING, &wdata->subreq.flags))
+	if (wdata->subreq.retry_count > 0)
 		smb2_set_replay(server, &rqst);
 
 	cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",

include/linux/iomap.h

@@ -335,7 +335,7 @@ struct iomap_ioend {
 	u16			io_type;
 	u16			io_flags;	/* IOMAP_F_* */
 	struct inode		*io_inode;	/* file being written to */
-	size_t			io_size;	/* size of the extent */
+	size_t			io_size;	/* size of data within eof */
 	loff_t			io_offset;	/* offset in the file */
 	sector_t		io_sector;	/* start sector of ioend */
 	struct bio		io_bio;		/* MUST BE LAST! */

include/linux/netfs.h

@@ -185,6 +185,7 @@ struct netfs_io_subrequest {
 	short			error;		/* 0 or error that occurred */
 	unsigned short		debug_index;	/* Index in list (for debugging output) */
 	unsigned int		nr_segs;	/* Number of segs in io_iter */
+	u8			retry_count;	/* The number of retries (0 on initial pass) */
 	enum netfs_io_source	source;		/* Where to read from/write to */
 	unsigned char		stream_nr;	/* I/O stream this belongs to */
 	unsigned char		curr_folioq_slot; /* Folio currently being read */
@@ -194,14 +195,13 @@ struct netfs_io_subrequest {
 #define NETFS_SREQ_COPY_TO_CACHE	0	/* Set if should copy the data to the cache */
 #define NETFS_SREQ_CLEAR_TAIL		1	/* Set if the rest of the read should be cleared */
 #define NETFS_SREQ_SEEK_DATA_READ	3	/* Set if ->read() should SEEK_DATA first */
-#define NETFS_SREQ_NO_PROGRESS		4	/* Set if we didn't manage to read any data */
+#define NETFS_SREQ_MADE_PROGRESS	4	/* Set if we transferred at least some data */
 #define NETFS_SREQ_ONDEMAND		5	/* Set if it's from on-demand read mode */
 #define NETFS_SREQ_BOUNDARY		6	/* Set if ends on hard boundary (eg. ceph object) */
 #define NETFS_SREQ_HIT_EOF		7	/* Set if short due to EOF */
 #define NETFS_SREQ_IN_PROGRESS		8	/* Unlocked when the subrequest completes */
 #define NETFS_SREQ_NEED_RETRY		9	/* Set if the filesystem requests a retry */
-#define NETFS_SREQ_RETRYING		10	/* Set if we're retrying */
+#define NETFS_SREQ_FAILED		10	/* Set if the subreq failed unretryably */
-#define NETFS_SREQ_FAILED		11	/* Set if the subreq failed unretryably */
 };
 
 enum netfs_io_origin {
@@ -269,7 +269,6 @@ struct netfs_io_request {
 	size_t			prev_donated;	/* Fallback for subreq->prev_donated */
 	refcount_t		ref;
 	unsigned long		flags;
-#define NETFS_RREQ_COPY_TO_CACHE	1	/* Need to write to the cache */
 #define NETFS_RREQ_NO_UNLOCK_FOLIO	2	/* Don't unlock no_unlock_folio on completion */
 #define NETFS_RREQ_DONT_UNLOCK_FOLIOS	3	/* Don't unlock the folios on completion */
 #define NETFS_RREQ_FAILED		4	/* The request failed */

kernel/gen_kheaders.sh

@@ -89,6 +89,7 @@ find $cpio_dir -type f -print0 |
 
 # Create archive and try to normalize metadata for reproducibility.
 tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
+    --exclude=".__afs*" --exclude=".nfs*" \
     --owner=0 --group=0 --sort=name --numeric-owner --mode=u=rw,go=r,a+X \
     -I $XZ -cf $tarfile -C $cpio_dir/ . > /dev/null