[23/26] netfs: Cut over to using new writeback code

Message ID	20240328163424.2781320-24-dhowells@redhat.com (mailing list archive)
State	Not Applicable
Headers	show Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CEBE713DDDF for <netdev@vger.kernel.org>; Thu, 28 Mar 2024 16:38:54 +0000 (UTC) From: David Howells <dhowells@redhat.com> To: Christian Brauner <christian@brauner.io>, Jeff Layton <jlayton@kernel.org>, Gao Xiang <hsiangkao@linux.alibaba.com>, Dominique Martinet <asmadeus@codewreck.org> Cc: David Howells <dhowells@redhat.com>, Matthew Wilcox <willy@infradead.org>, Steve French <smfrench@gmail.com>, Marc Dionne <marc.dionne@auristor.com>, Paulo Alcantara <pc@manguebit.com>, Shyam Prasad N <sprasad@microsoft.com>, Tom Talpey <tom@talpey.com>, Eric Van Hensbergen <ericvh@kernel.org>, Ilya Dryomov <idryomov@gmail.com>, netfs@lists.linux.dev, linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Latchesar Ionkov <lucho@ionkov.net>, Christian Schoenebeck <linux_oss@crudebyte.com> Subject: [PATCH 23/26] netfs: Cut over to using new writeback code Date: Thu, 28 Mar 2024 16:34:15 +0000 Message-ID: <20240328163424.2781320-24-dhowells@redhat.com> In-Reply-To: <20240328163424.2781320-1-dhowells@redhat.com> References: <20240328163424.2781320-1-dhowells@redhat.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	netfs, afs, 9p, cifs: Rework netfs to use ->writepages() to copy to cache \| expand [00/26] netfs, afs, 9p, cifs: Rework netfs to use ->writepages() to copy to cache [01/26] cifs: Fix duplicate fscache cookie warnings [02/26] 9p: Clean up some kdoc and unused var warnings. [03/26] netfs: Update i_blocks when write committed to pagecache [04/26] netfs: Replace PG_fscache by setting folio->private and marking dirty [05/26] mm: Remove the PG_fscache alias for PG_private_2 [06/26] netfs: Remove deprecated use of PG_private_2 as a second writeback flag [07/26] netfs: Make netfs_io_request::subreq_counter an atomic_t [08/26] netfs: Use subreq_counter to allocate subreq debug_index values [09/26] mm: Provide a means of invalidation without using launder_folio [10/26] cifs: Use alternative invalidation to using launder_folio [11/26] 9p: Use alternative invalidation to using launder_folio [12/26] afs: Use alternative invalidation to using launder_folio [13/26] netfs: Remove ->launder_folio() support [14/26] netfs: Use mempools for allocating requests and subrequests [15/26] mm: Export writeback_iter() [16/26] netfs: Switch to using unsigned long long rather than loff_t [17/26] netfs: Fix writethrough-mode error handling [18/26] netfs: Add some write-side stats and clean up some stat names [19/26] netfs: New writeback implementation [20/26] netfs, afs: Implement helpers for new write code [21/26] netfs, 9p: Implement helpers for new write code [22/26] netfs, cachefiles: Implement helpers for new write code [23/26] netfs: Cut over to using new writeback code [24/26] netfs: Remove the old writeback code [25/26] netfs: Miscellaneous tidy ups [26/26] netfs, afs: Use writeback retry to deal with alternate keys

Context	Check	Description
netdev/tree_selection	success	Not a local patch

diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c index 07d03efdd594..4845e655bc39 100644 --- a/fs/9p/vfs_addr.c +++ b/fs/9p/vfs_addr.c @@ -60,6 +60,7 @@ static void v9fs_issue_write(struct netfs_io_subrequest *subreq) netfs_write_subrequest_terminated(subreq, len ?: err, false); } +#if 0 // TODO: Remove static void v9fs_upload_to_server(struct netfs_io_subrequest *subreq) { struct p9_fid *fid = subreq->rreq->netfs_priv; @@ -91,6 +92,7 @@ static void v9fs_create_write_requests(struct netfs_io_request *wreq, loff_t sta if (subreq) netfs_queue_write_request(subreq); } +#endif /** * v9fs_issue_read - Issue a read from 9P @@ -121,18 +123,15 @@ static int v9fs_init_request(struct netfs_io_request *rreq, struct file *file) { struct p9_fid *fid; bool writing = (rreq->origin == NETFS_READ_FOR_WRITE || - rreq->origin == NETFS_WRITEBACK || rreq->origin == NETFS_WRITETHROUGH || rreq->origin == NETFS_UNBUFFERED_WRITE || rreq->origin == NETFS_DIO_WRITE); -#if 0 // TODO: Cut over if (rreq->origin == NETFS_WRITEBACK) return 0; /* We don't get the write handle until we find we * have actually dirty data and not just * copy-to-cache data. */ -#endif if (file) { fid = file->private_data; @@ -179,7 +178,6 @@ const struct netfs_request_ops v9fs_req_ops = { .issue_read = v9fs_issue_read, .begin_writeback = v9fs_begin_writeback, .issue_write = v9fs_issue_write, - .create_write_requests = v9fs_create_write_requests, }; const struct address_space_operations v9fs_addr_operations = { diff --git a/fs/afs/file.c b/fs/afs/file.c index db9ebae84fa2..8f983e3ecae7 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -353,7 +353,7 @@ static int afs_init_request(struct netfs_io_request *rreq, struct file *file) if (file) rreq->netfs_priv = key_get(afs_file_key(file)); rreq->rsize = 256 * 1024; - rreq->wsize = 256 * 1024; + rreq->wsize = 256 * 1024 * 1024; return 0; } @@ -399,7 +399,6 @@ const struct netfs_request_ops afs_req_ops = { .issue_read = afs_issue_read, .update_i_size = afs_update_i_size, .invalidate_cache = afs_netfs_invalidate_cache, - .create_write_requests = afs_create_write_requests, .begin_writeback = afs_begin_writeback, .prepare_write = afs_prepare_write, .issue_write = afs_issue_write, diff --git a/fs/afs/internal.h b/fs/afs/internal.h index dcf0ae0323d3..887245f9336d 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -1605,7 +1605,6 @@ extern int afs_writepages(struct address_space *, struct writeback_control *); extern int afs_fsync(struct file *, loff_t, loff_t, int); extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf); extern void afs_prune_wb_keys(struct afs_vnode *); -void afs_create_write_requests(struct netfs_io_request *wreq, loff_t start, size_t len); /* * xattr.c diff --git a/fs/afs/write.c b/fs/afs/write.c index 89b073881cac..0ead204c84cb 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -156,6 +156,7 @@ static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t return afs_put_operation(op); } +#if 0 // TODO: Remove static void afs_upload_to_server(struct netfs_io_subrequest *subreq) { struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode); @@ -193,6 +194,7 @@ void afs_create_write_requests(struct netfs_io_request *wreq, loff_t start, size if (subreq) netfs_queue_write_request(subreq); } +#endif /* * Writeback calls this when it finds a folio that needs uploading. This isn't diff --git a/fs/netfs/Makefile b/fs/netfs/Makefile index 1eb86e34b5a9..8e6781e0b10b 100644 --- a/fs/netfs/Makefile +++ b/fs/netfs/Makefile @@ -11,7 +11,6 @@ netfs-y := \ main.o \ misc.o \ objects.o \ - output.o \ write_collect.o \ write_issue.o diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c index 621532dacef5..945e646cd2db 100644 --- a/fs/netfs/buffered_write.c +++ b/fs/netfs/buffered_write.c @@ -26,8 +26,6 @@ enum netfs_how_to_modify { NETFS_FLUSH_CONTENT, /* Flush incompatible content. */ }; -static void netfs_cleanup_buffered_write(struct netfs_io_request *wreq); - static void netfs_set_group(struct folio *folio, struct netfs_group *netfs_group) { void *priv = folio_get_private(folio); @@ -180,7 +178,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, }; struct netfs_io_request *wreq = NULL; struct netfs_folio *finfo; - struct folio *folio; + struct folio *folio, *writethrough = NULL; enum netfs_how_to_modify howto; enum netfs_folio_trace trace; unsigned int bdp_flags = (iocb->ki_flags & IOCB_SYNC) ? 0: BDP_ASYNC; @@ -210,7 +208,6 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, } if (!is_sync_kiocb(iocb)) wreq->iocb = iocb; - wreq->cleanup = netfs_cleanup_buffered_write; netfs_stat(&netfs_n_wh_writethrough); } else { netfs_stat(&netfs_n_wh_buffered_write); @@ -254,6 +251,15 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, offset = pos & (flen - 1); part = min_t(size_t, flen - offset, part); + /* Wait for writeback to complete. The writeback engine owns + * the info in folio->private and may change it until it + * removes the WB mark. + */ + if (folio_wait_writeback_killable(folio)) { + ret = written ? -EINTR : -ERESTARTSYS; + goto error_folio_unlock; + } + if (signal_pending(current)) { ret = written ? -EINTR : -ERESTARTSYS; goto error_folio_unlock; @@ -328,6 +334,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, maybe_trouble = true; iov_iter_revert(iter, copied); copied = 0; + folio_unlock(folio); goto retry; } netfs_set_group(folio, netfs_group); @@ -383,23 +390,16 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, if (likely(!wreq)) { folio_mark_dirty(folio); + folio_unlock(folio); } else { - if (folio_test_dirty(folio)) - /* Sigh. mmap. */ - folio_clear_dirty_for_io(folio); - /* We make multiple writes to the folio... */ - if (!folio_test_writeback(folio)) { - folio_start_writeback(folio); - if (wreq->iter.count == 0) - trace_netfs_folio(folio, netfs_folio_trace_wthru); - else - trace_netfs_folio(folio, netfs_folio_trace_wthru_plus); - } - netfs_advance_writethrough(wreq, copied, - offset + copied == flen); + if (pos > wreq->i_size) + wreq->i_size = pos; + netfs_advance_writethrough(wreq, &wbc, folio, copied, + offset + copied == flen, + &writethrough); + /* Folio unlocked */ } retry: - folio_unlock(folio); folio_put(folio); folio = NULL; @@ -408,7 +408,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, out: if (unlikely(wreq)) { - ret2 = netfs_end_writethrough(wreq, iocb); + ret2 = netfs_end_writethrough(wreq, &wbc, writethrough); wbc_detach_inode(&wbc); if (ret2 == -EIOCBQUEUED) return ret2; @@ -530,11 +530,13 @@ vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_gr sb_start_pagefault(inode->i_sb); - if (folio_wait_writeback_killable(folio)) + if (folio_lock_killable(folio) < 0) goto out; - if (folio_lock_killable(folio) < 0) + if (folio_wait_writeback_killable(folio)) { + ret = VM_FAULT_LOCKED; goto out; + } /* Can we see a streaming write here? */ if (WARN_ON(!folio_test_uptodate(folio))) { @@ -574,6 +576,7 @@ vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_gr } EXPORT_SYMBOL(netfs_page_mkwrite); +#if 0 // TODO: Remove /* * Kill all the pages in the given range */ @@ -1200,3 +1203,4 @@ int netfs_writepages(struct address_space *mapping, return ret; } EXPORT_SYMBOL(netfs_writepages); +#endif diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c index 37c91188107b..330ba7cb3f10 100644 --- a/fs/netfs/direct_write.c +++ b/fs/netfs/direct_write.c @@ -34,6 +34,7 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov unsigned long long start = iocb->ki_pos; unsigned long long end = start + iov_iter_count(iter); ssize_t ret, n; + size_t len = iov_iter_count(iter); bool async = !is_sync_kiocb(iocb); _enter(""); @@ -46,13 +47,17 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov _debug("uw %llx-%llx", start, end); - wreq = netfs_alloc_request(iocb->ki_filp->f_mapping, iocb->ki_filp, - start, end - start, - iocb->ki_flags & IOCB_DIRECT ? - NETFS_DIO_WRITE : NETFS_UNBUFFERED_WRITE); + wreq = netfs_create_write_req(iocb->ki_filp->f_mapping, iocb->ki_filp, start, + iocb->ki_flags & IOCB_DIRECT ? + NETFS_DIO_WRITE : NETFS_UNBUFFERED_WRITE); if (IS_ERR(wreq)) return PTR_ERR(wreq); + wreq->io_streams[0].avail = true; + trace_netfs_write(wreq, (iocb->ki_flags & IOCB_DIRECT ? + netfs_write_trace_dio_write : + netfs_write_trace_unbuffered_write)); + { /* If this is an async op and we're not using a bounce buffer, * we have to save the source buffer as the iterator is only @@ -63,7 +68,7 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov * request. */ if (async || user_backed_iter(iter)) { - n = netfs_extract_user_iter(iter, wreq->len, &wreq->iter, 0); + n = netfs_extract_user_iter(iter, len, &wreq->iter, 0); if (n < 0) { ret = n; goto out; @@ -71,7 +76,6 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov wreq->direct_bv = (struct bio_vec *)wreq->iter.bvec; wreq->direct_bv_count = n; wreq->direct_bv_unpin = iov_iter_extract_will_pin(iter); - wreq->len = iov_iter_count(&wreq->iter); } else { wreq->iter = *iter; } @@ -79,6 +83,8 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov wreq->io_iter = wreq->iter; } + __set_bit(NETFS_RREQ_USE_IO_ITER, &wreq->flags); + /* Copy the data into the bounce buffer and encrypt it. */ // TODO @@ -87,10 +93,7 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov if (async) wreq->iocb = iocb; wreq->cleanup = netfs_cleanup_dio_write; - ret = netfs_begin_write(wreq, is_sync_kiocb(iocb), - iocb->ki_flags & IOCB_DIRECT ? - netfs_write_trace_dio_write : - netfs_write_trace_unbuffered_write); + ret = netfs_unbuffered_write(wreq, is_sync_kiocb(iocb), iov_iter_count(&wreq->io_iter)); if (ret < 0) { _debug("begin = %zd", ret); goto out; @@ -100,9 +103,8 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov 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; - _debug("waited = %zd", ret); if (ret == 0) { ret = wreq->transferred; iocb->ki_pos += ret; diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index 5d3f74a70fa7..95e281a8af78 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -92,15 +92,6 @@ static inline void netfs_see_request(struct netfs_io_request *rreq, trace_netfs_rreq_ref(rreq->debug_id, refcount_read(&rreq->ref), what); } -/* - * output.c - */ -int netfs_begin_write(struct netfs_io_request *wreq, bool may_wait, - enum netfs_write_trace what); -struct netfs_io_request *netfs_begin_writethrough(struct kiocb *iocb, size_t len); -int netfs_advance_writethrough(struct netfs_io_request *wreq, size_t copied, bool to_page_end); -int netfs_end_writethrough(struct netfs_io_request *wreq, struct kiocb *iocb); - /* * stats.c */ @@ -172,12 +163,12 @@ void netfs_reissue_write(struct netfs_io_stream *stream, int netfs_advance_write(struct netfs_io_request *wreq, struct netfs_io_stream *stream, loff_t start, size_t len, bool to_eof); -struct netfs_io_request *new_netfs_begin_writethrough(struct kiocb *iocb, size_t len); -int new_netfs_advance_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, - struct folio *folio, size_t copied, bool to_page_end, - struct folio **writethrough_cache); -int new_netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, - struct folio *writethrough_cache); +struct netfs_io_request *netfs_begin_writethrough(struct kiocb *iocb, size_t len); +int netfs_advance_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, + struct folio *folio, size_t copied, bool to_page_end, + struct folio **writethrough_cache); +int netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, + struct folio *writethrough_cache); int netfs_unbuffered_write(struct netfs_io_request *wreq, bool may_wait, size_t len); /* diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c index 5e2ca8b25af0..bea939ab0830 100644 --- a/fs/netfs/write_collect.c +++ b/fs/netfs/write_collect.c @@ -714,7 +714,7 @@ void netfs_wake_write_collector(struct netfs_io_request *wreq, bool was_async) } /** - * new_netfs_write_subrequest_terminated - Note the termination of a write operation. + * netfs_write_subrequest_terminated - Note the termination of a write operation. * @_op: The I/O request that has terminated. * @transferred_or_error: The amount of data transferred or an error code. * @was_async: The termination was asynchronous @@ -736,8 +736,8 @@ void netfs_wake_write_collector(struct netfs_io_request *wreq, bool was_async) * Note that %_op is a void* so that the function can be passed to * kiocb::term_func without the need for a casting wrapper. */ -void new_netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error, - bool was_async) +void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error, + bool was_async) { struct netfs_io_subrequest *subreq = _op; struct netfs_io_request *wreq = subreq->rreq; @@ -805,4 +805,4 @@ void new_netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_err netfs_put_subrequest(subreq, was_async, netfs_sreq_trace_put_terminated); } -EXPORT_SYMBOL(new_netfs_write_subrequest_terminated); +EXPORT_SYMBOL(netfs_write_subrequest_terminated); diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c index e0fb472898f5..61e6208de235 100644 --- a/fs/netfs/write_issue.c +++ b/fs/netfs/write_issue.c @@ -485,8 +485,8 @@ static int netfs_write_folio(struct netfs_io_request *wreq, /* * Write some of the pending data back to the server */ -int new_netfs_writepages(struct address_space *mapping, - struct writeback_control *wbc) +int netfs_writepages(struct address_space *mapping, + struct writeback_control *wbc) { struct netfs_inode *ictx = netfs_inode(mapping->host); struct netfs_io_request *wreq = NULL; @@ -547,12 +547,12 @@ int new_netfs_writepages(struct address_space *mapping, _leave(" = %d", error); return error; } -EXPORT_SYMBOL(new_netfs_writepages); +EXPORT_SYMBOL(netfs_writepages); /* * Begin a write operation for writing through the pagecache. */ -struct netfs_io_request *new_netfs_begin_writethrough(struct kiocb *iocb, size_t len) +struct netfs_io_request *netfs_begin_writethrough(struct kiocb *iocb, size_t len) { struct netfs_io_request *wreq = NULL; struct netfs_inode *ictx = netfs_inode(file_inode(iocb->ki_filp)); @@ -575,9 +575,9 @@ struct netfs_io_request *new_netfs_begin_writethrough(struct kiocb *iocb, size_t * to the request. If we've added more than wsize then we need to create a new * subrequest. */ -int new_netfs_advance_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, - struct folio *folio, size_t copied, bool to_page_end, - struct folio **writethrough_cache) +int netfs_advance_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, + struct folio *folio, size_t copied, bool to_page_end, + struct folio **writethrough_cache) { _enter("R=%x ic=%zu ws=%u cp=%zu tp=%u", wreq->debug_id, wreq->iter.count, wreq->wsize, copied, to_page_end); @@ -607,8 +607,8 @@ int new_netfs_advance_writethrough(struct netfs_io_request *wreq, struct writeba /* * End a write operation used when writing through the pagecache. */ -int new_netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, - struct folio *writethrough_cache) +int netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, + struct folio *writethrough_cache) { struct netfs_inode *ictx = netfs_inode(wreq->inode); int ret; diff --git a/include/linux/netfs.h b/include/linux/netfs.h index 42dba05a428b..c2ba364041b0 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -303,8 +303,6 @@ struct netfs_request_ops { void (*update_i_size)(struct inode *inode, loff_t i_size); /* Write request handling */ - void (*create_write_requests)(struct netfs_io_request *wreq, - loff_t start, size_t len); void (*begin_writeback)(struct netfs_io_request *wreq); void (*prepare_write)(struct netfs_io_subrequest *subreq); void (*issue_write)(struct netfs_io_subrequest *subreq); @@ -409,8 +407,6 @@ int netfs_write_begin(struct netfs_inode *, struct file *, struct folio **, void **fsdata); int netfs_writepages(struct address_space *mapping, struct writeback_control *wbc); -int new_netfs_writepages(struct address_space *mapping, - struct writeback_control *wbc); bool netfs_dirty_folio(struct address_space *mapping, struct folio *folio); int netfs_unpin_writeback(struct inode *inode, struct writeback_control *wbc); void netfs_clear_inode_writeback(struct inode *inode, const void *aux); @@ -431,14 +427,9 @@ ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len, iov_iter_extraction_t extraction_flags); size_t netfs_limit_iter(const struct iov_iter *iter, size_t start_offset, size_t max_size, size_t max_segs); -struct netfs_io_subrequest *netfs_create_write_request( - struct netfs_io_request *wreq, enum netfs_io_source dest, - loff_t start, size_t len, work_func_t worker); void netfs_prepare_write_failed(struct netfs_io_subrequest *subreq); void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error, bool was_async); -void new_netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error, - bool was_async); void netfs_queue_write_request(struct netfs_io_subrequest *subreq); int netfs_start_io_read(struct inode *inode);

[23/26] netfs: Cut over to using new writeback code

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