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Wed, 13 Dec 2023 15:26:44 +0000 (UTC) From: David Howells To: Jeff Layton , Steve French Cc: David Howells , Matthew Wilcox , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Dominique Martinet , Eric Van Hensbergen , Ilya Dryomov , Christian Brauner , 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-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 38/39] afs: Use the netfs write helpers Date: Wed, 13 Dec 2023 15:23:48 +0000 Message-ID: <20231213152350.431591-39-dhowells@redhat.com> In-Reply-To: <20231213152350.431591-1-dhowells@redhat.com> References: <20231213152350.431591-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.5 X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 1ADFD1C001C X-Stat-Signature: 99n1afttdkjgb4njseu634kkgqn77xoh X-HE-Tag: 1702481213-600111 X-HE-Meta: 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 s6EqEJjy Q4hWk7GnQQD4zdxFvIKu/smvNOUO0R1NZ4E7OlJTInAxbbiG7T4FqSJdU39jRWTkIw66CQERzLNJFdW7OTVOYpMfvmj0So5Kwd0MaTYW+Ym2mDaA48UXDU8VF/aycpJzO2r+WisJOFvfXEOynDsq3maVtz8OntUBzgPeZiX9qKyZAGAAOIyV4NT+dVkpP/lyKBu3xz+evUBl7l5vlZ27i916TCutP3ZRIuLBM0HwB2MLKoSt7/k8sXuJJACobqufKTnP74QmgUWgbEXCrqTD2UugPyFDoMZda2+yTUPzTIHvIJFcJS1scc9ydZj3Wdc93i1Bm2fWEam3NhspiJwY9P2rjheayeRlNAq4/g9bzUMX0UsNaRl5CZot9PX5K9PcQwD+BcQgbvNoWWmIGum829kpPq1+I12sUXzZ8viBEKxUfwaTE4w42fAMmOg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Make afs use the netfs write helpers. Signed-off-by: David Howells cc: Marc Dionne cc: Jeff Layton cc: linux-afs@lists.infradead.org cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- fs/afs/file.c | 70 +++- fs/afs/internal.h | 10 +- fs/afs/write.c | 705 ++----------------------------------- include/trace/events/afs.h | 23 -- 4 files changed, 84 insertions(+), 724 deletions(-) diff --git a/fs/afs/file.c b/fs/afs/file.c index aa95b4d6376c..3d33b221d9ca 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -34,7 +34,7 @@ const struct file_operations afs_file_operations = { .release = afs_release, .llseek = generic_file_llseek, .read_iter = afs_file_read_iter, - .write_iter = afs_file_write, + .write_iter = netfs_file_write_iter, .mmap = afs_file_mmap, .splice_read = afs_file_splice_read, .splice_write = iter_file_splice_write, @@ -50,16 +50,15 @@ const struct inode_operations afs_file_inode_operations = { }; const struct address_space_operations afs_file_aops = { + .direct_IO = noop_direct_IO, .read_folio = netfs_read_folio, .readahead = netfs_readahead, .dirty_folio = netfs_dirty_folio, - .launder_folio = afs_launder_folio, + .launder_folio = netfs_launder_folio, .release_folio = netfs_release_folio, .invalidate_folio = netfs_invalidate_folio, - .write_begin = afs_write_begin, - .write_end = afs_write_end, - .writepages = afs_writepages, .migrate_folio = filemap_migrate_folio, + .writepages = afs_writepages, }; const struct address_space_operations afs_symlink_aops = { @@ -352,7 +351,10 @@ static int afs_symlink_read_folio(struct file *file, struct folio *folio) static int afs_init_request(struct netfs_io_request *rreq, struct file *file) { - rreq->netfs_priv = key_get(afs_file_key(file)); + if (file) + rreq->netfs_priv = key_get(afs_file_key(file)); + rreq->rsize = 256 * 1024; + rreq->wsize = 256 * 1024; return 0; } @@ -369,11 +371,36 @@ static void afs_free_request(struct netfs_io_request *rreq) key_put(rreq->netfs_priv); } +static void afs_update_i_size(struct inode *inode, loff_t new_i_size) +{ + struct afs_vnode *vnode = AFS_FS_I(inode); + loff_t i_size; + + write_seqlock(&vnode->cb_lock); + i_size = i_size_read(&vnode->netfs.inode); + if (new_i_size > i_size) { + i_size_write(&vnode->netfs.inode, new_i_size); + inode_set_bytes(&vnode->netfs.inode, new_i_size); + } + write_sequnlock(&vnode->cb_lock); + fscache_update_cookie(afs_vnode_cache(vnode), NULL, &new_i_size); +} + +static void afs_netfs_invalidate_cache(struct netfs_io_request *wreq) +{ + struct afs_vnode *vnode = AFS_FS_I(wreq->inode); + + afs_invalidate_cache(vnode, 0); +} + const struct netfs_request_ops afs_req_ops = { .init_request = afs_init_request, .free_request = afs_free_request, .check_write_begin = afs_check_write_begin, .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, }; static void afs_add_open_mmap(struct afs_vnode *vnode) @@ -441,28 +468,39 @@ static vm_fault_t afs_vm_map_pages(struct vm_fault *vmf, pgoff_t start_pgoff, pg static ssize_t afs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) { - struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); + struct inode *inode = file_inode(iocb->ki_filp); + struct afs_vnode *vnode = AFS_FS_I(inode); struct afs_file *af = iocb->ki_filp->private_data; - int ret; + ssize_t ret; - ret = afs_validate(vnode, af->key); + if (iocb->ki_flags & IOCB_DIRECT) + return netfs_unbuffered_read_iter(iocb, iter); + + ret = netfs_start_io_read(inode); if (ret < 0) return ret; - - return generic_file_read_iter(iocb, iter); + ret = afs_validate(vnode, af->key); + if (ret == 0) + ret = filemap_read(iocb, iter, 0); + netfs_end_io_read(inode); + return ret; } static ssize_t afs_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags) { - struct afs_vnode *vnode = AFS_FS_I(file_inode(in)); + struct inode *inode = file_inode(in); + struct afs_vnode *vnode = AFS_FS_I(inode); struct afs_file *af = in->private_data; - int ret; + ssize_t ret; - ret = afs_validate(vnode, af->key); + ret = netfs_start_io_read(inode); if (ret < 0) return ret; - - return filemap_splice_read(in, ppos, pipe, len, flags); + ret = afs_validate(vnode, af->key); + if (ret == 0) + ret = filemap_splice_read(in, ppos, pipe, len, flags); + netfs_end_io_read(inode); + return ret; } diff --git a/fs/afs/internal.h b/fs/afs/internal.h index b638c0f87298..326eba1c89c7 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -1601,19 +1601,11 @@ bool afs_try_get_volume(struct afs_volume *volume, enum afs_volume_trace reason) /* * write.c */ -extern int afs_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, - struct page **pagep, void **fsdata); -extern int afs_write_end(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *page, void *fsdata); -extern int afs_writepage(struct page *, struct writeback_control *); extern int afs_writepages(struct address_space *, struct writeback_control *); -extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *); 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 *); -int afs_launder_folio(struct folio *); +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 959dfa8f1af0..74402d95a884 100644 --- a/fs/afs/write.c +++ b/fs/afs/write.c @@ -12,228 +12,17 @@ #include #include #include +#include #include "internal.h" -static int afs_writepages_region(struct address_space *mapping, - struct writeback_control *wbc, - unsigned long long start, - unsigned long long end, loff_t *_next, - bool max_one_loop); - -static void afs_write_to_cache(struct afs_vnode *vnode, loff_t start, size_t len, - loff_t i_size, bool caching); - -#ifdef CONFIG_AFS_FSCACHE -static void afs_folio_start_fscache(bool caching, struct folio *folio) -{ - if (caching) - folio_start_fscache(folio); -} -#else -static void afs_folio_start_fscache(bool caching, struct folio *folio) -{ -} -#endif - -/* - * prepare to perform part of a write to a page - */ -int afs_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, - struct page **_page, void **fsdata) -{ - struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); - struct folio *folio; - int ret; - - _enter("{%llx:%llu},%llx,%x", - vnode->fid.vid, vnode->fid.vnode, pos, len); - - /* Prefetch area to be written into the cache if we're caching this - * file. We need to do this before we get a lock on the page in case - * there's more than one writer competing for the same cache block. - */ - ret = netfs_write_begin(&vnode->netfs, file, mapping, pos, len, &folio, fsdata); - if (ret < 0) - return ret; - -try_again: - /* See if this page is already partially written in a way that we can - * merge the new write with. - */ - if (folio_test_writeback(folio)) { - trace_afs_folio_dirty(vnode, tracepoint_string("alrdy"), folio); - folio_unlock(folio); - goto wait_for_writeback; - } - - *_page = folio_file_page(folio, pos / PAGE_SIZE); - _leave(" = 0"); - return 0; - -wait_for_writeback: - ret = folio_wait_writeback_killable(folio); - if (ret < 0) - goto error; - - ret = folio_lock_killable(folio); - if (ret < 0) - goto error; - goto try_again; - -error: - folio_put(folio); - _leave(" = %d", ret); - return ret; -} - -/* - * finalise part of a write to a page - */ -int afs_write_end(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned copied, - struct page *subpage, void *fsdata) -{ - struct folio *folio = page_folio(subpage); - struct afs_vnode *vnode = AFS_FS_I(file_inode(file)); - loff_t i_size, write_end_pos; - - _enter("{%llx:%llu},{%lx}", - vnode->fid.vid, vnode->fid.vnode, folio_index(folio)); - - if (!folio_test_uptodate(folio)) { - if (copied < len) { - copied = 0; - goto out; - } - - folio_mark_uptodate(folio); - } - - if (copied == 0) - goto out; - - write_end_pos = pos + copied; - - i_size = i_size_read(&vnode->netfs.inode); - if (write_end_pos > i_size) { - write_seqlock(&vnode->cb_lock); - i_size = i_size_read(&vnode->netfs.inode); - if (write_end_pos > i_size) - afs_set_i_size(vnode, write_end_pos); - write_sequnlock(&vnode->cb_lock); - fscache_update_cookie(afs_vnode_cache(vnode), NULL, &write_end_pos); - } - - if (folio_mark_dirty(folio)) - _debug("dirtied %lx", folio_index(folio)); - -out: - folio_unlock(folio); - folio_put(folio); - return copied; -} - -/* - * kill all the pages in the given range - */ -static void afs_kill_pages(struct address_space *mapping, - loff_t start, loff_t len) -{ - struct afs_vnode *vnode = AFS_FS_I(mapping->host); - struct folio *folio; - pgoff_t index = start / PAGE_SIZE; - pgoff_t last = (start + len - 1) / PAGE_SIZE, next; - - _enter("{%llx:%llu},%llx @%llx", - vnode->fid.vid, vnode->fid.vnode, len, start); - - do { - _debug("kill %lx (to %lx)", index, last); - - folio = filemap_get_folio(mapping, index); - if (IS_ERR(folio)) { - next = index + 1; - continue; - } - - next = folio_next_index(folio); - - folio_clear_uptodate(folio); - folio_end_writeback(folio); - folio_lock(folio); - generic_error_remove_folio(mapping, folio); - folio_unlock(folio); - folio_put(folio); - - } while (index = next, index <= last); - - _leave(""); -} - -/* - * Redirty all the pages in a given range. - */ -static void afs_redirty_pages(struct writeback_control *wbc, - struct address_space *mapping, - loff_t start, loff_t len) -{ - struct afs_vnode *vnode = AFS_FS_I(mapping->host); - struct folio *folio; - pgoff_t index = start / PAGE_SIZE; - pgoff_t last = (start + len - 1) / PAGE_SIZE, next; - - _enter("{%llx:%llu},%llx @%llx", - vnode->fid.vid, vnode->fid.vnode, len, start); - - do { - _debug("redirty %llx @%llx", len, start); - - folio = filemap_get_folio(mapping, index); - if (IS_ERR(folio)) { - next = index + 1; - continue; - } - - next = index + folio_nr_pages(folio); - folio_redirty_for_writepage(wbc, folio); - folio_end_writeback(folio); - folio_put(folio); - } while (index = next, index <= last); - - _leave(""); -} - /* * completion of write to server */ static void afs_pages_written_back(struct afs_vnode *vnode, loff_t start, unsigned int len) { - struct address_space *mapping = vnode->netfs.inode.i_mapping; - struct folio *folio; - pgoff_t end; - - XA_STATE(xas, &mapping->i_pages, start / PAGE_SIZE); - _enter("{%llx:%llu},{%x @%llx}", vnode->fid.vid, vnode->fid.vnode, len, start); - rcu_read_lock(); - - end = (start + len - 1) / PAGE_SIZE; - xas_for_each(&xas, folio, end) { - if (!folio_test_writeback(folio)) { - kdebug("bad %x @%llx page %lx %lx", - len, start, folio_index(folio), end); - ASSERT(folio_test_writeback(folio)); - } - - trace_afs_folio_dirty(vnode, tracepoint_string("clear"), folio); - folio_end_writeback(folio); - } - - rcu_read_unlock(); - afs_prune_wb_keys(vnode); _leave(""); } @@ -370,337 +159,53 @@ static int afs_store_data(struct afs_vnode *vnode, struct iov_iter *iter, loff_t return afs_put_operation(op); } -/* - * Extend the region to be written back to include subsequent contiguously - * dirty pages if possible, but don't sleep while doing so. - * - * If this page holds new content, then we can include filler zeros in the - * writeback. - */ -static void afs_extend_writeback(struct address_space *mapping, - struct afs_vnode *vnode, - long *_count, - loff_t start, - loff_t max_len, - bool caching, - size_t *_len) +static void afs_upload_to_server(struct netfs_io_subrequest *subreq) { - struct folio_batch fbatch; - struct folio *folio; - pgoff_t index = (start + *_len) / PAGE_SIZE; - bool stop = true; - unsigned int i; - - XA_STATE(xas, &mapping->i_pages, index); - folio_batch_init(&fbatch); - - do { - /* Firstly, we gather up a batch of contiguous dirty pages - * under the RCU read lock - but we can't clear the dirty flags - * there if any of those pages are mapped. - */ - rcu_read_lock(); - - xas_for_each(&xas, folio, ULONG_MAX) { - stop = true; - if (xas_retry(&xas, folio)) - continue; - if (xa_is_value(folio)) - break; - if (folio_index(folio) != index) - break; - - if (!folio_try_get_rcu(folio)) { - xas_reset(&xas); - continue; - } - - /* Has the folio moved or been split? */ - if (unlikely(folio != xas_reload(&xas))) { - folio_put(folio); - break; - } - - if (!folio_trylock(folio)) { - folio_put(folio); - break; - } - if (!folio_test_dirty(folio) || - folio_test_writeback(folio) || - folio_test_fscache(folio)) { - folio_unlock(folio); - folio_put(folio); - break; - } - - index += folio_nr_pages(folio); - *_count -= folio_nr_pages(folio); - *_len += folio_size(folio); - stop = false; - if (*_len >= max_len || *_count <= 0) - stop = true; - - if (!folio_batch_add(&fbatch, folio)) - break; - if (stop) - break; - } - - if (!stop) - xas_pause(&xas); - rcu_read_unlock(); - - /* Now, if we obtained any folios, we can shift them to being - * writable and mark them for caching. - */ - if (!folio_batch_count(&fbatch)) - break; - - for (i = 0; i < folio_batch_count(&fbatch); i++) { - folio = fbatch.folios[i]; - trace_afs_folio_dirty(vnode, tracepoint_string("store+"), folio); + struct afs_vnode *vnode = AFS_FS_I(subreq->rreq->inode); + ssize_t ret; - if (!folio_clear_dirty_for_io(folio)) - BUG(); - folio_start_writeback(folio); - afs_folio_start_fscache(caching, folio); - folio_unlock(folio); - } + _enter("%x[%x],%zx", + subreq->rreq->debug_id, subreq->debug_index, subreq->io_iter.count); - folio_batch_release(&fbatch); - cond_resched(); - } while (!stop); + trace_netfs_sreq(subreq, netfs_sreq_trace_submit); + ret = afs_store_data(vnode, &subreq->io_iter, subreq->start, + subreq->rreq->origin == NETFS_LAUNDER_WRITE); + netfs_write_subrequest_terminated(subreq, ret < 0 ? ret : subreq->len, + false); } -/* - * Synchronously write back the locked page and any subsequent non-locked dirty - * pages. - */ -static ssize_t afs_write_back_from_locked_folio(struct address_space *mapping, - struct writeback_control *wbc, - struct folio *folio, - unsigned long long start, - unsigned long long end) +static void afs_upload_to_server_worker(struct work_struct *work) { - struct afs_vnode *vnode = AFS_FS_I(mapping->host); - struct iov_iter iter; - unsigned long long i_size = i_size_read(&vnode->netfs.inode); - size_t len, max_len; - bool caching = fscache_cookie_enabled(afs_vnode_cache(vnode)); - long count = wbc->nr_to_write; - int ret; - - _enter(",%lx,%llx-%llx", folio_index(folio), start, end); - - folio_start_writeback(folio); - afs_folio_start_fscache(caching, folio); - - count -= folio_nr_pages(folio); - - /* Find all consecutive lockable dirty pages that have contiguous - * written regions, stopping when we find a page that is not - * immediately lockable, is not dirty or is missing, or we reach the - * end of the range. - */ - trace_afs_folio_dirty(vnode, tracepoint_string("store"), folio); - - len = folio_size(folio); - if (start < i_size) { - /* Trim the write to the EOF; the extra data is ignored. Also - * put an upper limit on the size of a single storedata op. - */ - max_len = 65536 * 4096; - max_len = min_t(unsigned long long, max_len, end - start + 1); - max_len = min_t(unsigned long long, max_len, i_size - start); - - if (len < max_len) - afs_extend_writeback(mapping, vnode, &count, - start, max_len, caching, &len); - len = min_t(unsigned long long, len, i_size - start); - } - - /* We now have a contiguous set of dirty pages, each with writeback - * set; the first page is still locked at this point, but all the rest - * have been unlocked. - */ - folio_unlock(folio); - - if (start < i_size) { - _debug("write back %zx @%llx [%llx]", len, start, i_size); - - /* Speculatively write to the cache. We have to fix this up - * later if the store fails. - */ - afs_write_to_cache(vnode, start, len, i_size, caching); - - iov_iter_xarray(&iter, ITER_SOURCE, &mapping->i_pages, start, len); - ret = afs_store_data(vnode, &iter, start, false); - } else { - _debug("write discard %zx @%llx [%llx]", len, start, i_size); - - /* The dirty region was entirely beyond the EOF. */ - fscache_clear_page_bits(mapping, start, len, caching); - afs_pages_written_back(vnode, start, len); - ret = 0; - } - - switch (ret) { - case 0: - wbc->nr_to_write = count; - ret = len; - break; - - default: - pr_notice("kAFS: Unexpected error from FS.StoreData %d\n", ret); - fallthrough; - case -EACCES: - case -EPERM: - case -ENOKEY: - case -EKEYEXPIRED: - case -EKEYREJECTED: - case -EKEYREVOKED: - case -ENETRESET: - afs_redirty_pages(wbc, mapping, start, len); - mapping_set_error(mapping, ret); - break; - - case -EDQUOT: - case -ENOSPC: - afs_redirty_pages(wbc, mapping, start, len); - mapping_set_error(mapping, -ENOSPC); - break; - - case -EROFS: - case -EIO: - case -EREMOTEIO: - case -EFBIG: - case -ENOENT: - case -ENOMEDIUM: - case -ENXIO: - trace_afs_file_error(vnode, ret, afs_file_error_writeback_fail); - afs_kill_pages(mapping, start, len); - mapping_set_error(mapping, ret); - break; - } + struct netfs_io_subrequest *subreq = + container_of(work, struct netfs_io_subrequest, work); - _leave(" = %d", ret); - return ret; + afs_upload_to_server(subreq); } /* - * write a region of pages back to the server + * Set up write requests for a writeback slice. We need to add a write request + * for each write we want to make. */ -static int afs_writepages_region(struct address_space *mapping, - struct writeback_control *wbc, - unsigned long long start, - unsigned long long end, loff_t *_next, - bool max_one_loop) +void afs_create_write_requests(struct netfs_io_request *wreq, loff_t start, size_t len) { - struct folio *folio; - struct folio_batch fbatch; - ssize_t ret; - unsigned int i; - int n, skips = 0; - - _enter("%llx,%llx,", start, end); - folio_batch_init(&fbatch); + struct netfs_io_subrequest *subreq; - do { - pgoff_t index = start / PAGE_SIZE; + _enter("%x,%llx-%llx", wreq->debug_id, start, start + len); - n = filemap_get_folios_tag(mapping, &index, end / PAGE_SIZE, - PAGECACHE_TAG_DIRTY, &fbatch); - - if (!n) - break; - for (i = 0; i < n; i++) { - folio = fbatch.folios[i]; - start = folio_pos(folio); /* May regress with THPs */ - - _debug("wback %lx", folio_index(folio)); - - /* 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 NULL), or even swizzled - * back from swapper_space to tmpfs file mapping - */ -try_again: - if (wbc->sync_mode != WB_SYNC_NONE) { - ret = folio_lock_killable(folio); - if (ret < 0) { - folio_batch_release(&fbatch); - return ret; - } - } else { - if (!folio_trylock(folio)) - continue; - } - - if (folio->mapping != mapping || - !folio_test_dirty(folio)) { - start += folio_size(folio); - folio_unlock(folio); - continue; - } - - if (folio_test_writeback(folio) || - folio_test_fscache(folio)) { - folio_unlock(folio); - if (wbc->sync_mode != WB_SYNC_NONE) { - folio_wait_writeback(folio); -#ifdef CONFIG_AFS_FSCACHE - folio_wait_fscache(folio); -#endif - goto try_again; - } - - start += folio_size(folio); - if (wbc->sync_mode == WB_SYNC_NONE) { - if (skips >= 5 || need_resched()) { - *_next = start; - folio_batch_release(&fbatch); - _leave(" = 0 [%llx]", *_next); - return 0; - } - skips++; - } - continue; - } - - if (!folio_clear_dirty_for_io(folio)) - BUG(); - ret = afs_write_back_from_locked_folio(mapping, wbc, - folio, start, end); - if (ret < 0) { - _leave(" = %zd", ret); - folio_batch_release(&fbatch); - return ret; - } - - start += ret; - } - - folio_batch_release(&fbatch); - cond_resched(); - } while (wbc->nr_to_write > 0); - - *_next = start; - _leave(" = 0 [%llx]", *_next); - return 0; + subreq = netfs_create_write_request(wreq, NETFS_UPLOAD_TO_SERVER, + start, len, afs_upload_to_server_worker); + if (subreq) + netfs_queue_write_request(subreq); } /* * write some of the pending data back to the server */ -int afs_writepages(struct address_space *mapping, - struct writeback_control *wbc) +int afs_writepages(struct address_space *mapping, struct writeback_control *wbc) { struct afs_vnode *vnode = AFS_FS_I(mapping->host); - loff_t start, next; int ret; - _enter(""); - /* We have to be careful as we can end up racing with setattr() * truncating the pagecache since the caller doesn't take a lock here * to prevent it. @@ -710,68 +215,11 @@ int afs_writepages(struct address_space *mapping, else if (!down_read_trylock(&vnode->validate_lock)) return 0; - if (wbc->range_cyclic) { - start = mapping->writeback_index * PAGE_SIZE; - ret = afs_writepages_region(mapping, wbc, start, LLONG_MAX, - &next, false); - if (ret == 0) { - mapping->writeback_index = next / PAGE_SIZE; - if (start > 0 && wbc->nr_to_write > 0) { - ret = afs_writepages_region(mapping, wbc, 0, - start, &next, false); - if (ret == 0) - mapping->writeback_index = - next / PAGE_SIZE; - } - } - } else if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) { - ret = afs_writepages_region(mapping, wbc, 0, LLONG_MAX, - &next, false); - if (wbc->nr_to_write > 0 && ret == 0) - mapping->writeback_index = next / PAGE_SIZE; - } else { - ret = afs_writepages_region(mapping, wbc, - wbc->range_start, wbc->range_end, - &next, false); - } - + ret = netfs_writepages(mapping, wbc); up_read(&vnode->validate_lock); - _leave(" = %d", ret); return ret; } -/* - * write to an AFS file - */ -ssize_t afs_file_write(struct kiocb *iocb, struct iov_iter *from) -{ - struct afs_vnode *vnode = AFS_FS_I(file_inode(iocb->ki_filp)); - struct afs_file *af = iocb->ki_filp->private_data; - ssize_t result; - size_t count = iov_iter_count(from); - - _enter("{%llx:%llu},{%zu},", - vnode->fid.vid, vnode->fid.vnode, count); - - if (IS_SWAPFILE(&vnode->netfs.inode)) { - printk(KERN_INFO - "AFS: Attempt to write to active swap file!\n"); - return -EBUSY; - } - - if (!count) - return 0; - - result = afs_validate(vnode, af->key); - if (result < 0) - return result; - - result = generic_file_write_iter(iocb, from); - - _leave(" = %zd", result); - return result; -} - /* * flush any dirty pages for this process, and check for write errors. * - the return status from this call provides a reliable indication of @@ -800,49 +248,11 @@ int afs_fsync(struct file *file, loff_t start, loff_t end, int datasync) */ vm_fault_t afs_page_mkwrite(struct vm_fault *vmf) { - struct folio *folio = page_folio(vmf->page); struct file *file = vmf->vma->vm_file; - struct inode *inode = file_inode(file); - struct afs_vnode *vnode = AFS_FS_I(inode); - struct afs_file *af = file->private_data; - vm_fault_t ret = VM_FAULT_RETRY; - - _enter("{{%llx:%llu}},{%lx}", vnode->fid.vid, vnode->fid.vnode, folio_index(folio)); - - afs_validate(vnode, af->key); - - sb_start_pagefault(inode->i_sb); - - /* Wait for the page to be written to the cache before we allow it to - * be modified. We then assume the entire page will need writing back. - */ -#ifdef CONFIG_AFS_FSCACHE - if (folio_test_fscache(folio) && - folio_wait_fscache_killable(folio) < 0) - goto out; -#endif - - if (folio_wait_writeback_killable(folio)) - goto out; - - if (folio_lock_killable(folio) < 0) - goto out; - - if (folio_wait_writeback_killable(folio) < 0) { - folio_unlock(folio); - goto out; - } - - if (folio_test_dirty(folio)) - trace_afs_folio_dirty(vnode, tracepoint_string("mkwrite+"), folio); - else - trace_afs_folio_dirty(vnode, tracepoint_string("mkwrite"), folio); - file_update_time(file); - ret = VM_FAULT_LOCKED; -out: - sb_end_pagefault(inode->i_sb); - return ret; + if (afs_validate(AFS_FS_I(file_inode(file)), afs_file_key(file)) < 0) + return VM_FAULT_SIGBUS; + return netfs_page_mkwrite(vmf, NULL); } /* @@ -872,60 +282,3 @@ void afs_prune_wb_keys(struct afs_vnode *vnode) afs_put_wb_key(wbk); } } - -/* - * Clean up a page during invalidation. - */ -int afs_launder_folio(struct folio *folio) -{ - struct afs_vnode *vnode = AFS_FS_I(folio_inode(folio)); - struct iov_iter iter; - struct bio_vec bv; - unsigned long long fend, i_size = vnode->netfs.inode.i_size; - size_t len; - int ret = 0; - - _enter("{%lx}", folio->index); - - if (folio_clear_dirty_for_io(folio) && folio_pos(folio) < i_size) { - len = folio_size(folio); - fend = folio_pos(folio) + len; - if (vnode->netfs.inode.i_size < fend) - len = fend - i_size; - - bvec_set_folio(&bv, folio, len, 0); - iov_iter_bvec(&iter, WRITE, &bv, 1, len); - - trace_afs_folio_dirty(vnode, tracepoint_string("launder"), folio); - ret = afs_store_data(vnode, &iter, folio_pos(folio), true); - } - - trace_afs_folio_dirty(vnode, tracepoint_string("laundered"), folio); - folio_wait_fscache(folio); - return ret; -} - -/* - * Deal with the completion of writing the data to the cache. - */ -static void afs_write_to_cache_done(void *priv, ssize_t transferred_or_error, - bool was_async) -{ - struct afs_vnode *vnode = priv; - - if (IS_ERR_VALUE(transferred_or_error) && - transferred_or_error != -ENOBUFS) - afs_invalidate_cache(vnode, 0); -} - -/* - * Save the write to the cache also. - */ -static void afs_write_to_cache(struct afs_vnode *vnode, - loff_t start, size_t len, loff_t i_size, - bool caching) -{ - fscache_write_to_cache(afs_vnode_cache(vnode), - vnode->netfs.inode.i_mapping, start, len, i_size, - afs_write_to_cache_done, vnode, caching); -} diff --git a/include/trace/events/afs.h b/include/trace/events/afs.h index 7780bd716ce0..8d73171cb9f0 100644 --- a/include/trace/events/afs.h +++ b/include/trace/events/afs.h @@ -902,29 +902,6 @@ TRACE_EVENT(afs_dir_check_failed, __entry->vnode, __entry->off, __entry->i_size) ); -TRACE_EVENT(afs_folio_dirty, - TP_PROTO(struct afs_vnode *vnode, const char *where, struct folio *folio), - - TP_ARGS(vnode, where, folio), - - TP_STRUCT__entry( - __field(struct afs_vnode *, vnode) - __field(const char *, where) - __field(pgoff_t, index) - __field(size_t, size) - ), - - TP_fast_assign( - __entry->vnode = vnode; - __entry->where = where; - __entry->index = folio_index(folio); - __entry->size = folio_size(folio); - ), - - TP_printk("vn=%p ix=%05lx s=%05lx %s", - __entry->vnode, __entry->index, __entry->size, __entry->where) - ); - TRACE_EVENT(afs_call_state, TP_PROTO(struct afs_call *call, enum afs_call_state from,