Merge tag 'vfs-6.8-rc2.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull netfs fixes from Christian Brauner:
 "This contains various fixes for the netfs work merged earlier this
  cycle:

  afs:
   - Fix locking imbalance in afs_proc_addr_prefs_show()
   - Remove afs_dynroot_d_revalidate() which is redundant
   - Fix error handling during lookup
   - Hide sillyrenames from userspace. This fixes a race between
     silly-rename files being created/removed and userspace iterating
     over directory entries
   - Don't use unnecessary folio_*() functions

  cifs:
   - Don't use unnecessary folio_*() functions

  cachefiles:
   - erofs: Fix Null dereference when cachefiles are not doing
     ondemand-mode
   - Update mailing list

  netfs library:
   - Add Jeff Layton as reviewer
   - Update mailing list
   - Fix a error checking in netfs_perform_write()
   - fscache: Check error before dereferencing
   - Don't use unnecessary folio_*() functions"

* tag 'vfs-6.8-rc2.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
  afs: Fix missing/incorrect unlocking of RCU read lock
  afs: Remove afs_dynroot_d_revalidate() as it is redundant
  afs: Fix error handling with lookup via FS.InlineBulkStatus
  afs: Hide silly-rename files from userspace
  cachefiles, erofs: Fix NULL deref in when cachefiles is not doing ondemand-mode
  netfs: Fix a NULL vs IS_ERR() check in netfs_perform_write()
  netfs, fscache: Prevent Oops in fscache_put_cache()
  cifs: Don't use certain unnecessary folio_*() functions
  afs: Don't use certain unnecessary folio_*() functions
  netfs: Don't use certain unnecessary folio_*() functions
  netfs: Add Jeff Layton as reviewer
  netfs, cachefiles: Change mailing list

Author: torvalds

MAINTAINERS

@@ -4547,7 +4547,7 @@ F:	drivers/net/ieee802154/ca8210.c
 
 CACHEFILES: FS-CACHE BACKEND FOR CACHING ON MOUNTED FILESYSTEMS
 M:	David Howells <[email protected]>
-L:	[email protected] (moderated for non-subscribers)
+L:	[email protected]
 S:	Supported
 F:	Documentation/filesystems/caching/cachefiles.rst
 F:	fs/cachefiles/
@@ -8224,7 +8224,8 @@ F:	include/linux/iomap.h
 
 FILESYSTEMS [NETFS LIBRARY]
 M:	David Howells <[email protected]>
-L:	[email protected] (moderated for non-subscribers)
+R:	Jeff Layton <[email protected]>
+L:	[email protected]
 L:	[email protected]
 S:	Supported
 F:	Documentation/filesystems/caching/

fs/afs/dir.c

@@ -124,7 +124,7 @@ static void afs_dir_read_cleanup(struct afs_read *req)
 		if (xas_retry(&xas, folio))
 			continue;
 		BUG_ON(xa_is_value(folio));
-		ASSERTCMP(folio_file_mapping(folio), ==, mapping);
+		ASSERTCMP(folio->mapping, ==, mapping);
 
 		folio_put(folio);
 	}
@@ -202,12 +202,12 @@ static void afs_dir_dump(struct afs_vnode *dvnode, struct afs_read *req)
 		if (xas_retry(&xas, folio))
 			continue;
 
-		BUG_ON(folio_file_mapping(folio) != mapping);
+		BUG_ON(folio->mapping != mapping);
 
 		size = min_t(loff_t, folio_size(folio), req->actual_len - folio_pos(folio));
 		for (offset = 0; offset < size; offset += sizeof(*block)) {
 			block = kmap_local_folio(folio, offset);
-			pr_warn("[%02lx] %32phN\n", folio_index(folio) + offset, block);
+			pr_warn("[%02lx] %32phN\n", folio->index + offset, block);
 			kunmap_local(block);
 		}
 	}
@@ -233,7 +233,7 @@ static int afs_dir_check(struct afs_vnode *dvnode, struct afs_read *req)
 		if (xas_retry(&xas, folio))
 			continue;
 
-		BUG_ON(folio_file_mapping(folio) != mapping);
+		BUG_ON(folio->mapping != mapping);
 
 		if (!afs_dir_check_folio(dvnode, folio, req->actual_len)) {
 			afs_dir_dump(dvnode, req);
@@ -474,6 +474,14 @@ static int afs_dir_iterate_block(struct afs_vnode *dvnode,
 			continue;
 		}
 
+		/* Don't expose silly rename entries to userspace. */
+		if (nlen > 6 &&
+		    dire->u.name[0] == '.' &&
+		    ctx->actor != afs_lookup_filldir &&
+		    ctx->actor != afs_lookup_one_filldir &&
+		    memcmp(dire->u.name, ".__afs", 6) == 0)
+			continue;
+
 		/* found the next entry */
 		if (!dir_emit(ctx, dire->u.name, nlen,
 			      ntohl(dire->u.vnode),
@@ -708,6 +716,8 @@ static void afs_do_lookup_success(struct afs_operation *op)
 			break;
 		}
 
+		if (vp->scb.status.abort_code)
+			trace_afs_bulkstat_error(op, &vp->fid, i, vp->scb.status.abort_code);
 		if (!vp->scb.have_status && !vp->scb.have_error)
 			continue;
 
@@ -897,12 +907,16 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
 		afs_begin_vnode_operation(op);
 		afs_wait_for_operation(op);
 	}
-	inode = ERR_PTR(afs_op_error(op));
 
 out_op:
 	if (!afs_op_error(op)) {
-		inode = &op->file[1].vnode->netfs.inode;
-		op->file[1].vnode = NULL;
+		if (op->file[1].scb.status.abort_code) {
+			afs_op_accumulate_error(op, -ECONNABORTED,
+						op->file[1].scb.status.abort_code);
+		} else {
+			inode = &op->file[1].vnode->netfs.inode;
+			op->file[1].vnode = NULL;
+		}
 	}
 
 	if (op->file[0].scb.have_status)
@@ -2022,7 +2036,7 @@ static bool afs_dir_release_folio(struct folio *folio, gfp_t gfp_flags)
 {
 	struct afs_vnode *dvnode = AFS_FS_I(folio_inode(folio));
 
-	_enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio_index(folio));
+	_enter("{{%llx:%llu}[%lu]}", dvnode->fid.vid, dvnode->fid.vnode, folio->index);
 
 	folio_detach_private(folio);
 

fs/afs/dynroot.c

@@ -258,16 +258,7 @@ const struct inode_operations afs_dynroot_inode_operations = {
 	.lookup		= afs_dynroot_lookup,
 };
 
-/*
- * Dirs in the dynamic root don't need revalidation.
- */
-static int afs_dynroot_d_revalidate(struct dentry *dentry, unsigned int flags)
-{
-	return 1;
-}
-
 const struct dentry_operations afs_dynroot_dentry_operations = {
-	.d_revalidate	= afs_dynroot_d_revalidate,
 	.d_delete	= always_delete_dentry,
 	.d_release	= afs_d_release,
 	.d_automount	= afs_d_automount,

fs/afs/proc.c

@@ -166,7 +166,7 @@ static int afs_proc_addr_prefs_show(struct seq_file *m, void *v)
 
 	if (!preflist) {
 		seq_puts(m, "NO PREFS\n");
-		return 0;
+		goto out;
 	}
 
 	seq_printf(m, "PROT SUBNET                                      PRIOR (v=%u n=%u/%u/%u)\n",
@@ -191,7 +191,8 @@ static int afs_proc_addr_prefs_show(struct seq_file *m, void *v)
 		}
 	}
 
-	rcu_read_lock();
+out:
+	rcu_read_unlock();
 	return 0;
 }
 

fs/cachefiles/ondemand.c

@@ -539,6 +539,9 @@ int cachefiles_ondemand_init_object(struct cachefiles_object *object)
 	struct fscache_volume *volume = object->volume->vcookie;
 	size_t volume_key_size, cookie_key_size, data_len;
 
+	if (!object->ondemand)
+		return 0;
+
 	/*
 	 * CacheFiles will firstly check the cache file under the root cache
 	 * directory. If the coherency check failed, it will fallback to

fs/netfs/buffered_read.c

@@ -101,7 +101,7 @@ void netfs_rreq_unlock_folios(struct netfs_io_request *rreq)
 		}
 
 		if (!test_bit(NETFS_RREQ_DONT_UNLOCK_FOLIOS, &rreq->flags)) {
-			if (folio_index(folio) == rreq->no_unlock_folio &&
+			if (folio->index == rreq->no_unlock_folio &&
 			    test_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags))
 				_debug("no unlock");
 			else
@@ -246,13 +246,13 @@ EXPORT_SYMBOL(netfs_readahead);
  */
 int netfs_read_folio(struct file *file, struct folio *folio)
 {
-	struct address_space *mapping = folio_file_mapping(folio);
+	struct address_space *mapping = folio->mapping;
 	struct netfs_io_request *rreq;
 	struct netfs_inode *ctx = netfs_inode(mapping->host);
 	struct folio *sink = NULL;
 	int ret;
 
-	_enter("%lx", folio_index(folio));
+	_enter("%lx", folio->index);
 
 	rreq = netfs_alloc_request(mapping, file,
 				   folio_file_pos(folio), folio_size(folio),
@@ -460,7 +460,7 @@ int netfs_write_begin(struct netfs_inode *ctx,
 		ret = PTR_ERR(rreq);
 		goto error;
 	}
-	rreq->no_unlock_folio	= folio_index(folio);
+	rreq->no_unlock_folio	= folio->index;
 	__set_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags);
 
 	ret = netfs_begin_cache_read(rreq, ctx);
@@ -518,7 +518,7 @@ int netfs_prefetch_for_write(struct file *file, struct folio *folio,
 			     size_t offset, size_t len)
 {
 	struct netfs_io_request *rreq;
-	struct address_space *mapping = folio_file_mapping(folio);
+	struct address_space *mapping = folio->mapping;
 	struct netfs_inode *ctx = netfs_inode(mapping->host);
 	unsigned long long start = folio_pos(folio);
 	size_t flen = folio_size(folio);
@@ -535,7 +535,7 @@ int netfs_prefetch_for_write(struct file *file, struct folio *folio,
 		goto error;
 	}
 
-	rreq->no_unlock_folio = folio_index(folio);
+	rreq->no_unlock_folio = folio->index;
 	__set_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags);
 	ret = netfs_begin_cache_read(rreq, ctx);
 	if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS)

fs/netfs/buffered_write.c

@@ -221,10 +221,11 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
 		if (unlikely(fault_in_iov_iter_readable(iter, part) == part))
 			break;
 
-		ret = -ENOMEM;
 		folio = netfs_grab_folio_for_write(mapping, pos, part);
-		if (!folio)
+		if (IS_ERR(folio)) {
+			ret = PTR_ERR(folio);
 			break;
+		}
 
 		flen = folio_size(folio);
 		offset = pos & (flen - 1);
@@ -343,7 +344,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
 			break;
 		default:
 			WARN(true, "Unexpected modify type %u ix=%lx\n",
-			     howto, folio_index(folio));
+			     howto, folio->index);
 			ret = -EIO;
 			goto error_folio_unlock;
 		}
@@ -648,7 +649,7 @@ static void netfs_pages_written_back(struct netfs_io_request *wreq)
 	xas_for_each(&xas, folio, last) {
 		WARN(!folio_test_writeback(folio),
 		     "bad %zx @%llx page %lx %lx\n",
-		     wreq->len, wreq->start, folio_index(folio), last);
+		     wreq->len, wreq->start, folio->index, last);
 
 		if ((finfo = netfs_folio_info(folio))) {
 			/* Streaming writes cannot be redirtied whilst under
@@ -795,7 +796,7 @@ static void netfs_extend_writeback(struct address_space *mapping,
 				continue;
 			if (xa_is_value(folio))
 				break;
-			if (folio_index(folio) != index) {
+			if (folio->index != index) {
 				xas_reset(xas);
 				break;
 			}
@@ -901,7 +902,7 @@ static ssize_t netfs_write_back_from_locked_folio(struct address_space *mapping,
 	long count = wbc->nr_to_write;
 	int ret;
 
-	_enter(",%lx,%llx-%llx,%u", folio_index(folio), start, end, caching);
+	_enter(",%lx,%llx-%llx,%u", folio->index, start, end, caching);
 
 	wreq = netfs_alloc_request(mapping, NULL, start, folio_size(folio),
 				   NETFS_WRITEBACK);
@@ -1047,7 +1048,7 @@ static ssize_t netfs_writepages_begin(struct address_space *mapping,
 
 	start = folio_pos(folio); /* May regress with THPs */
 
-	_debug("wback %lx", folio_index(folio));
+	_debug("wback %lx", folio->index);
 
 	/* At this point we hold neither the i_pages lock nor the page lock:
 	 * the page may be truncated or invalidated (changing page->mapping to

fs/netfs/fscache_cache.c

@@ -179,13 +179,14 @@ EXPORT_SYMBOL(fscache_acquire_cache);
 void fscache_put_cache(struct fscache_cache *cache,
 		       enum fscache_cache_trace where)
 {
-	unsigned int debug_id = cache->debug_id;
+	unsigned int debug_id;
 	bool zero;
 	int ref;
 
 	if (IS_ERR_OR_NULL(cache))
 		return;
 
+	debug_id = cache->debug_id;
 	zero = __refcount_dec_and_test(&cache->ref, &ref);
 	trace_fscache_cache(debug_id, ref - 1, where);
 

fs/netfs/io.c

@@ -124,7 +124,7 @@ static void netfs_rreq_unmark_after_write(struct netfs_io_request *rreq,
 			/* We might have multiple writes from the same huge
 			 * folio, but we mustn't unlock a folio more than once.
 			 */
-			if (have_unlocked && folio_index(folio) <= unlocked)
+			if (have_unlocked && folio->index <= unlocked)
 				continue;
 			unlocked = folio_next_index(folio) - 1;
 			trace_netfs_folio(folio, netfs_folio_trace_end_copy);

fs/netfs/misc.c

@@ -180,7 +180,7 @@ void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t length)
 	struct netfs_folio *finfo = NULL;
 	size_t flen = folio_size(folio);
 
-	_enter("{%lx},%zx,%zx", folio_index(folio), offset, length);
+	_enter("{%lx},%zx,%zx", folio->index, offset, length);
 
 	folio_wait_fscache(folio);