diff options
| -rw-r--r-- | fs/9p/vfs_addr.c | 11 | ||||
| -rw-r--r-- | fs/afs/file.c | 21 | ||||
| -rw-r--r-- | fs/afs/fsclient.c | 9 | ||||
| -rw-r--r-- | fs/afs/yfsclient.c | 9 | ||||
| -rw-r--r-- | fs/ceph/addr.c | 76 | ||||
| -rw-r--r-- | fs/netfs/Makefile | 4 | ||||
| -rw-r--r-- | fs/netfs/buffered_read.c | 766 | ||||
| -rw-r--r-- | fs/netfs/direct_read.c | 147 | ||||
| -rw-r--r-- | fs/netfs/internal.h | 35 | ||||
| -rw-r--r-- | fs/netfs/iterator.c | 50 | ||||
| -rw-r--r-- | fs/netfs/main.c | 4 | ||||
| -rw-r--r-- | fs/netfs/objects.c | 8 | ||||
| -rw-r--r-- | fs/netfs/read_collect.c | 544 | ||||
| -rw-r--r-- | fs/netfs/read_pgpriv2.c | 264 | ||||
| -rw-r--r-- | fs/netfs/read_retry.c | 256 | ||||
| -rw-r--r-- | fs/netfs/stats.c | 6 | ||||
| -rw-r--r-- | fs/netfs/write_collect.c | 9 | ||||
| -rw-r--r-- | fs/netfs/write_issue.c | 17 | ||||
| -rw-r--r-- | fs/nfs/fscache.c | 19 | ||||
| -rw-r--r-- | fs/nfs/fscache.h | 7 | ||||
| -rw-r--r-- | fs/smb/client/cifsglob.h | 1 | ||||
| -rw-r--r-- | fs/smb/client/cifssmb.c | 6 | ||||
| -rw-r--r-- | fs/smb/client/file.c | 82 | ||||
| -rw-r--r-- | fs/smb/client/smb2ops.c | 3 | ||||
| -rw-r--r-- | fs/smb/client/smb2pdu.c | 27 | ||||
| -rw-r--r-- | include/linux/folio_queue.h | 18 | ||||
| -rw-r--r-- | include/linux/netfs.h | 26 | ||||
| -rw-r--r-- | include/trace/events/netfs.h | 103 |
28 files changed, 2058 insertions, 470 deletions
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c index 24fdc74caeba..819c75233235 100644 --- a/fs/9p/vfs_addr.c +++ b/fs/9p/vfs_addr.c @@ -68,17 +68,22 @@ static void v9fs_issue_read(struct netfs_io_subrequest *subreq) { struct netfs_io_request *rreq = subreq->rreq; struct p9_fid *fid = rreq->netfs_priv; + unsigned long long pos = subreq->start + subreq->transferred; int total, err; - total = p9_client_read(fid, subreq->start + subreq->transferred, - &subreq->io_iter, &err); + total = p9_client_read(fid, pos, &subreq->io_iter, &err); /* if we just extended the file size, any portion not in * cache won't be on server and is zeroes */ if (subreq->rreq->origin != NETFS_DIO_READ) __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); + if (pos + total >= i_size_read(rreq->inode)) + __set_bit(NETFS_SREQ_HIT_EOF, &subreq->flags); - netfs_subreq_terminated(subreq, err ?: total, false); + if (!err) + subreq->transferred += total; + + netfs_read_subreq_terminated(subreq, err, false); } /** diff --git a/fs/afs/file.c b/fs/afs/file.c index 5a9d16848ad5..492d857a3fa0 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -16,6 +16,7 @@ #include <linux/mm.h> #include <linux/swap.h> #include <linux/netfs.h> +#include <trace/events/netfs.h> #include "internal.h" static int afs_file_mmap(struct file *file, struct vm_area_struct *vma); @@ -242,9 +243,10 @@ static void afs_fetch_data_notify(struct afs_operation *op) req->error = error; if (subreq) { - if (subreq->rreq->origin != NETFS_DIO_READ) - __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); - netfs_subreq_terminated(subreq, error ?: req->actual_len, false); + subreq->rreq->i_size = req->file_size; + if (req->pos + req->actual_len >= req->file_size) + __set_bit(NETFS_SREQ_HIT_EOF, &subreq->flags); + netfs_read_subreq_terminated(subreq, error, false); req->subreq = NULL; } else if (req->done) { req->done(req); @@ -262,6 +264,12 @@ static void afs_fetch_data_success(struct afs_operation *op) afs_fetch_data_notify(op); } +static void afs_fetch_data_aborted(struct afs_operation *op) +{ + afs_check_for_remote_deletion(op); + afs_fetch_data_notify(op); +} + static void afs_fetch_data_put(struct afs_operation *op) { op->fetch.req->error = afs_op_error(op); @@ -272,7 +280,7 @@ static const struct afs_operation_ops afs_fetch_data_operation = { .issue_afs_rpc = afs_fs_fetch_data, .issue_yfs_rpc = yfs_fs_fetch_data, .success = afs_fetch_data_success, - .aborted = afs_check_for_remote_deletion, + .aborted = afs_fetch_data_aborted, .failed = afs_fetch_data_notify, .put = afs_fetch_data_put, }; @@ -294,7 +302,7 @@ int afs_fetch_data(struct afs_vnode *vnode, struct afs_read *req) op = afs_alloc_operation(req->key, vnode->volume); if (IS_ERR(op)) { if (req->subreq) - netfs_subreq_terminated(req->subreq, PTR_ERR(op), false); + netfs_read_subreq_terminated(req->subreq, PTR_ERR(op), false); return PTR_ERR(op); } @@ -313,7 +321,7 @@ static void afs_read_worker(struct work_struct *work) fsreq = afs_alloc_read(GFP_NOFS); if (!fsreq) - return netfs_subreq_terminated(subreq, -ENOMEM, false); + return netfs_read_subreq_terminated(subreq, -ENOMEM, false); fsreq->subreq = subreq; fsreq->pos = subreq->start + subreq->transferred; @@ -322,6 +330,7 @@ static void afs_read_worker(struct work_struct *work) fsreq->vnode = vnode; fsreq->iter = &subreq->io_iter; + trace_netfs_sreq(subreq, netfs_sreq_trace_submit); afs_fetch_data(fsreq->vnode, fsreq); afs_put_read(fsreq); } diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c index 79cd30775b7a..098fa034a1cc 100644 --- a/fs/afs/fsclient.c +++ b/fs/afs/fsclient.c @@ -304,6 +304,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call) struct afs_vnode_param *vp = &op->file[0]; struct afs_read *req = op->fetch.req; const __be32 *bp; + size_t count_before; int ret; _enter("{%u,%zu,%zu/%llu}", @@ -345,10 +346,14 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call) /* extract the returned data */ case 2: - _debug("extract data %zu/%llu", - iov_iter_count(call->iter), req->actual_len); + count_before = call->iov_len; + _debug("extract data %zu/%llu", count_before, req->actual_len); ret = afs_extract_data(call, true); + if (req->subreq) { + req->subreq->transferred += count_before - call->iov_len; + netfs_read_subreq_progress(req->subreq, false); + } if (ret < 0) return ret; diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c index f521e66d3bf6..024227aba4cd 100644 --- a/fs/afs/yfsclient.c +++ b/fs/afs/yfsclient.c @@ -355,6 +355,7 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call) struct afs_vnode_param *vp = &op->file[0]; struct afs_read *req = op->fetch.req; const __be32 *bp; + size_t count_before; int ret; _enter("{%u,%zu, %zu/%llu}", @@ -391,10 +392,14 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call) /* extract the returned data */ case 2: - _debug("extract data %zu/%llu", - iov_iter_count(call->iter), req->actual_len); + count_before = call->iov_len; + _debug("extract data %zu/%llu", count_before, req->actual_len); ret = afs_extract_data(call, true); + if (req->subreq) { + req->subreq->transferred += count_before - call->iov_len; + netfs_read_subreq_progress(req->subreq, false); + } if (ret < 0) return ret; diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index c4744a02db75..c500c1fd6b9f 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -13,6 +13,7 @@ #include <linux/iversion.h> #include <linux/ktime.h> #include <linux/netfs.h> +#include <trace/events/netfs.h> #include "super.h" #include "mds_client.h" @@ -205,21 +206,6 @@ static void ceph_netfs_expand_readahead(struct netfs_io_request *rreq) } } -static bool ceph_netfs_clamp_length(struct netfs_io_subrequest *subreq) -{ - struct inode *inode = subreq->rreq->inode; - struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); - struct ceph_inode_info *ci = ceph_inode(inode); - u64 objno, objoff; - u32 xlen; - - /* Truncate the extent at the end of the current block */ - ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len, - &objno, &objoff, &xlen); - subreq->len = min(xlen, fsc->mount_options->rsize); - return true; -} - static void finish_netfs_read(struct ceph_osd_request *req) { struct inode *inode = req->r_inode; @@ -264,7 +250,12 @@ static void finish_netfs_read(struct ceph_osd_request *req) calc_pages_for(osd_data->alignment, osd_data->length), false); } - netfs_subreq_terminated(subreq, err, false); + if (err > 0) { + subreq->transferred = err; + err = 0; + } + trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress); + netfs_read_subreq_terminated(subreq, err, false); iput(req->r_inode); ceph_dec_osd_stopping_blocker(fsc->mdsc); } @@ -278,7 +269,6 @@ static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq) struct ceph_mds_request *req; struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); struct ceph_inode_info *ci = ceph_inode(inode); - struct iov_iter iter; ssize_t err = 0; size_t len; int mode; @@ -301,6 +291,7 @@ static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq) req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INLINE_DATA); req->r_num_caps = 2; + trace_netfs_sreq(subreq, netfs_sreq_trace_submit); err = ceph_mdsc_do_request(mdsc, NULL, req); if (err < 0) goto out; @@ -314,17 +305,36 @@ static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq) } len = min_t(size_t, iinfo->inline_len - subreq->start, subreq->len); - iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len); - err = copy_to_iter(iinfo->inline_data + subreq->start, len, &iter); - if (err == 0) + err = copy_to_iter(iinfo->inline_data + subreq->start, len, &subreq->io_iter); + if (err == 0) { err = -EFAULT; + } else { + subreq->transferred += err; + err = 0; + } ceph_mdsc_put_request(req); out: - netfs_subreq_terminated(subreq, err, false); + netfs_read_subreq_terminated(subreq, err, false); return true; } +static int ceph_netfs_prepare_read(struct netfs_io_subrequest *subreq) +{ + struct netfs_io_request *rreq = subreq->rreq; + struct inode *inode = rreq->inode; + struct ceph_inode_info *ci = ceph_inode(inode); + struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); + u64 objno, objoff; + u32 xlen; + + /* Truncate the extent at the end of the current block */ + ceph_calc_file_object_mapping(&ci->i_layout, subreq->start, subreq->len, + &objno, &objoff, &xlen); + rreq->io_streams[0].sreq_max_len = umin(xlen, fsc->mount_options->rsize); + return 0; +} + static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) { struct netfs_io_request *rreq = subreq->rreq; @@ -334,9 +344,8 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) struct ceph_client *cl = fsc->client; struct ceph_osd_request *req = NULL; struct ceph_vino vino = ceph_vino(inode); - struct iov_iter iter; - int err = 0; - u64 len = subreq->len; + int err; + u64 len; bool sparse = IS_ENCRYPTED(inode) || ceph_test_mount_opt(fsc, SPARSEREAD); u64 off = subreq->start; int extent_cnt; @@ -349,6 +358,12 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) if (ceph_has_inline_data(ci) && ceph_netfs_issue_op_inline(subreq)) return; + // TODO: This rounding here is slightly dodgy. It *should* work, for + // now, as the cache only deals in blocks that are a multiple of + // PAGE_SIZE and fscrypt blocks are at most PAGE_SIZE. What needs to + // happen is for the fscrypt driving to be moved into netfslib and the + // data in the cache also to be stored encrypted. + len = subreq->len; ceph_fscrypt_adjust_off_and_len(inode, &off, &len); req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout, vino, @@ -371,8 +386,6 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) doutc(cl, "%llx.%llx pos=%llu orig_len=%zu len=%llu\n", ceph_vinop(inode), subreq->start, subreq->len, len); - iov_iter_xarray(&iter, ITER_DEST, &rreq->mapping->i_pages, subreq->start, len); - /* * FIXME: For now, use CEPH_OSD_DATA_TYPE_PAGES instead of _ITER for * encrypted inodes. We'd need infrastructure that handles an iov_iter @@ -384,7 +397,7 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) struct page **pages; size_t page_off; - err = iov_iter_get_pages_alloc2(&iter, &pages, len, &page_off); + err = iov_iter_get_pages_alloc2(&subreq->io_iter, &pages, len, &page_off); if (err < 0) { doutc(cl, "%llx.%llx failed to allocate pages, %d\n", ceph_vinop(inode), err); @@ -399,7 +412,7 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) osd_req_op_extent_osd_data_pages(req, 0, pages, len, 0, false, false); } else { - osd_req_op_extent_osd_iter(req, 0, &iter); + osd_req_op_extent_osd_iter(req, 0, &subreq->io_iter); } if (!ceph_inc_osd_stopping_blocker(fsc->mdsc)) { err = -EIO; @@ -410,17 +423,19 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) req->r_inode = inode; ihold(inode); + trace_netfs_sreq(subreq, netfs_sreq_trace_submit); ceph_osdc_start_request(req->r_osdc, req); out: ceph_osdc_put_request(req); if (err) - netfs_subreq_terminated(subreq, err, false); + netfs_read_subreq_terminated(subreq, err, false); doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err); } static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) { struct inode *inode = rreq->inode; + struct ceph_fs_client *fsc = ceph_inode_to_fs_client(inode); struct ceph_client *cl = ceph_inode_to_client(inode); int got = 0, want = CEPH_CAP_FILE_CACHE; struct ceph_netfs_request_data *priv; @@ -472,6 +487,7 @@ static int ceph_init_request(struct netfs_io_request *rreq, struct file *file) priv->caps = got; rreq->netfs_priv = priv; + rreq->io_streams[0].sreq_max_len = fsc->mount_options->rsize; out: if (ret < 0) @@ -496,9 +512,9 @@ static void ceph_netfs_free_request(struct netfs_io_request *rreq) const struct netfs_request_ops ceph_netfs_ops = { .init_request = ceph_init_request, .free_request = ceph_netfs_free_request, + .prepare_read = ceph_netfs_prepare_read, .issue_read = ceph_netfs_issue_read, .expand_readahead = ceph_netfs_expand_readahead, - .clamp_length = ceph_netfs_clamp_length, .check_write_begin = ceph_netfs_check_write_begin, }; diff --git a/fs/netfs/Makefile b/fs/netfs/Makefile index 8e6781e0b10b..d08b0bfb6756 100644 --- a/fs/netfs/Makefile +++ b/fs/netfs/Makefile @@ -5,12 +5,14 @@ netfs-y := \ buffered_write.o \ direct_read.o \ direct_write.o \ - io.o \ iterator.o \ locking.o \ main.o \ misc.o \ objects.o \ + read_collect.o \ + read_pgpriv2.o \ + read_retry.o \ write_collect.o \ write_issue.o diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index 27c750d39476..c40e226053cc 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -9,266 +9,388 @@ #include <linux/task_io_accounting_ops.h> #include "internal.h" -/* - * [DEPRECATED] Unlock the folios in a read operation for when the filesystem - * is using PG_private_2 and direct writing to the cache from here rather than - * marking the page for writeback. - * - * Note that we don't touch folio->private in this code. - */ -static void netfs_rreq_unlock_folios_pgpriv2(struct netfs_io_request *rreq, - size_t *account) +static void netfs_cache_expand_readahead(struct netfs_io_request *rreq, + unsigned long long *_start, + unsigned long long *_len, + unsigned long long i_size) { - struct netfs_io_subrequest *subreq; - struct folio *folio; - pgoff_t start_page = rreq->start / PAGE_SIZE; - pgoff_t last_page = ((rreq->start + rreq->len) / PAGE_SIZE) - 1; - bool subreq_failed = false; + struct netfs_cache_resources *cres = &rreq->cache_resources; - XA_STATE(xas, &rreq->mapping->i_pages, start_page); + if (cres->ops && cres->ops->expand_readahead) + cres->ops->expand_readahead(cres, _start, _len, i_size); +} - /* Walk through the pagecache and the I/O request lists simultaneously. - * We may have a mixture of cached and uncached sections and we only - * really want to write out the uncached sections. This is slightly - * complicated by the possibility that we might have huge pages with a - * mixture inside. +static void netfs_rreq_expand(struct netfs_io_request *rreq, + struct readahead_control *ractl) +{ + /* Give the cache a chance to change the request parameters. The + * resultant request must contain the original region. */ - subreq = list_first_entry(&rreq->subrequests, - struct netfs_io_subrequest, rreq_link); - subreq_failed = (subreq->error < 0); + netfs_cache_expand_readahead(rreq, &rreq->start, &rreq->len, rreq->i_size); - trace_netfs_rreq(rreq, netfs_rreq_trace_unlock_pgpriv2); + /* Give the netfs a chance to change the request parameters. The + * resultant request must contain the original region. + */ + if (rreq->netfs_ops->expand_readahead) + rreq->netfs_ops->expand_readahead(rreq); - rcu_read_lock(); - xas_for_each(&xas, folio, last_page) { - loff_t pg_end; - bool pg_failed = false; - bool folio_started = false; + /* Expand the request if the cache wants it to start earlier. Note + * that the expansion may get further extended if the VM wishes to + * insert THPs and the preferred start and/or end wind up in the middle + * of THPs. + * + * If this is the case, however, the THP size should be an integer + * multiple of the cache granule size, so we get a whole number of + * granules to deal with. + */ + if (rreq->start != readahead_pos(ractl) || + rreq->len != readahead_length(ractl)) { + readahead_expand(ractl, rreq->start, rreq->len); + rreq->start = readahead_pos(ractl); + rreq->len = readahead_length(ractl); - if (xas_retry(&xas, folio)) - continue; + trace_netfs_read(rreq, readahead_pos(ractl), readahead_length(ractl), + netfs_read_trace_expanded); + } +} - pg_end = folio_pos(folio) + folio_size(folio) - 1; +/* + * Begin an operation, and fetch the stored zero point value from the cookie if + * available. + */ +static int netfs_begin_cache_read(struct netfs_io_request *rreq, struct netfs_inode *ctx) +{ + return fscache_begin_read_operation(&rreq->cache_resources, netfs_i_cookie(ctx)); +} - for (;;) { - loff_t sreq_end; +/* + * Decant the list of folios to read into a rolling buffer. + */ +static size_t netfs_load_buffer_from_ra(struct netfs_io_request *rreq, + struct folio_queue *folioq) +{ + unsigned int order, nr; + size_t size = 0; + + nr = __readahead_batch(rreq->ractl, (struct page **)folioq->vec.folios, + ARRAY_SIZE(folioq->vec.folios)); + folioq->vec.nr = nr; + for (int i = 0; i < nr; i++) { + struct folio *folio = folioq_folio(folioq, i); + + trace_netfs_folio(folio, netfs_folio_trace_read); + order = folio_order(folio); + folioq->orders[i] = order; + size += PAGE_SIZE << order; + } - if (!subreq) { - pg_failed = true; - break; - } + for (int i = nr; i < folioq_nr_slots(folioq); i++) + folioq_clear(folioq, i); - if (!folio_started && - test_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags) && - fscache_operation_valid(&rreq->cache_resources)) { - trace_netfs_folio(folio, netfs_folio_trace_copy_to_cache); - folio_start_private_2(folio); - folio_started = true; - } + return size; +} - pg_failed |= subreq_failed; - sreq_end = subreq->start + subreq->len - 1; - if (pg_end < sreq_end) - break; +/* + * netfs_prepare_read_iterator - Prepare the subreq iterator for I/O + * @subreq: The subrequest to be set up + * + * Prepare the I/O iterator representing the read buffer on a subrequest for + * the filesystem to use for I/O (it can be passed directly to a socket). This + * is intended to be called from the ->issue_read() method once the filesystem + * has trimmed the request to the size it wants. + * + * Returns the limited size if successful and -ENOMEM if insufficient memory + * available. + * + * [!] NOTE: This must be run in the same thread as ->issue_read() was called + * in as we access the readahead_control struct. + */ +static ssize_t netfs_prepare_read_iterator(struct netfs_io_subrequest *subreq) +{ + struct netfs_io_request *rreq = subreq->rreq; + size_t rsize = subreq->len; + + if (subreq->source == NETFS_DOWNLOAD_FROM_SERVER) + rsize = umin(rsize, rreq->io_streams[0].sreq_max_len); + + if (rreq->ractl) { + /* If we don't have sufficient folios in the rolling buffer, + * extract a folioq's worth from the readahead region at a time + * into the buffer. Note that this acquires a ref on each page + * that we will need to release later - but we don't want to do + * that until after we've started the I/O. + */ + while (rreq->submitted < subreq->start + rsize) { + struct folio_queue *tail = rreq->buffer_tail, *new; + size_t added; + + new = kmalloc(sizeof(*new), GFP_NOFS); + if (!new) + return -ENOMEM; + netfs_stat(&netfs_n_folioq); + folioq_init(new); + new->prev = tail; + tail->next = new; + rreq->buffer_tail = new; + added = netfs_load_buffer_from_ra(rreq, new); + rreq->iter.count += added; + rreq->submitted += added; + } + } - *account += subreq->transferred; - if (!list_is_last(&subreq->rreq_link, &rreq->subrequests)) { - subreq = list_next_entry(subreq, rreq_link); - subreq_failed = (subreq->error < 0); - } else { - subreq = NULL; - subreq_failed = false; - } + subreq->len = rsize; + if (unlikely(rreq->io_streams[0].sreq_max_segs)) { + size_t limit = netfs_limit_iter(&rreq->iter, 0, rsize, + rreq->io_streams[0].sreq_max_segs); - if (pg_end == sreq_end) - break; + if (limit < rsize) { + subreq->len = limit; + trace_netfs_sreq(subreq, netfs_sreq_trace_limited); } + } - if (!pg_failed) { - flush_dcache_folio(folio); - folio_mark_uptodate(folio); - } + subreq->io_iter = rreq->iter; - if (!test_bit(NETFS_RREQ_DONT_UNLOCK_FOLIOS, &rreq->flags)) { - if (folio->index == rreq->no_unlock_folio && - test_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags)) - _debug("no unlock"); - else - folio_unlock(folio); + if (iov_iter_is_folioq(&subreq->io_iter)) { + if (subreq->io_iter.folioq_slot >= folioq_nr_slots(subreq->io_iter.folioq)) { + subreq->io_iter.folioq = subreq->io_iter.folioq->next; + subreq->io_iter.folioq_slot = 0; } + subreq->curr_folioq = (struct folio_queue *)subreq->io_iter.folioq; + subreq->curr_folioq_slot = subreq->io_iter.folioq_slot; + subreq->curr_folio_order = subreq->curr_folioq->orders[subreq->curr_folioq_slot]; } - rcu_read_unlock(); + + iov_iter_truncate(&subreq->io_iter, subreq->len); + iov_iter_advance(&rreq->iter, subreq->len); + return subreq->len; } -/* - * Unlock the folios in a read operation. We need to set PG_writeback on any - * folios we're going to write back before we unlock them. - * - * Note that if the deprecated NETFS_RREQ_USE_PGPRIV2 is set then we use - * PG_private_2 and do a direct write to the cache from here instead. - */ -void netfs_rreq_unlock_folios(struct netfs_io_request *rreq) +static enum netfs_io_source netfs_cache_prepare_read(struct netfs_io_request *rreq, + struct netfs_io_subrequest *subreq, + loff_t i_size) { - struct netfs_io_subrequest *subreq; - struct netfs_folio *finfo; - struct folio *folio; - pgoff_t start_page = rreq->start / PAGE_SIZE; - pgoff_t last_page = ((rreq->start + rreq->len) / PAGE_SIZE) - 1; - size_t account = 0; - bool subreq_failed = false; + struct netfs_cache_resources *cres = &rreq->cache_resources; - XA_STATE(xas, &rreq->mapping->i_pages, start_page); + if (!cres->ops) + return NETFS_DOWNLOAD_FROM_SERVER; + return cres->ops->prepare_read(subreq, i_size); +} - if (test_bit(NETFS_RREQ_FAILED, &rreq->flags)) { - __clear_bit(NETFS_RREQ_COPY_TO_CACHE, &rreq->flags); - list_for_each_entry(subreq, &rreq->subrequests, rreq_link) { - __clear_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags); - } - } +static void netfs_cache_read_terminated(void *priv, ssize_t transferred_or_error, + bool was_async) +{ + struct netfs_io_subrequest *subreq = priv; - /* Handle deprecated PG_private_2 case. */ - if (test_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags)) { - netfs_rreq_unlock_folios_pgpriv2(rreq, &account); - goto out; + if (transferred_or_error < 0) { + netfs_read_subreq_terminated(subreq, transferred_or_error, was_async); + return; } - /* Walk through the pagecache and the I/O request lists simultaneously. - * We may have a mixture of cached and uncached sections and we only - * really want to write out the uncached sections. This is slightly - * complicated by the possibility that we might have huge pages with a - * mixture inside. - */ - subreq = list_first_entry(&rreq->subrequests, - struct netfs_io_subrequest, rreq_link); - subreq_failed = (subreq->error < 0); - - trace_netfs_rreq(rreq, netfs_rreq_trace_unlock); + if (transferred_or_error > 0) + subreq->transferred += transferred_or_error; + netfs_read_subreq_terminated(subreq, 0, was_async); +} - rcu_read_lock(); - xas_for_each(&xas, folio, last_page) { - loff_t pg_end; - bool pg_failed = false; - bool wback_to_cache = false; +/* + * Issue a read against the cache. + * - Eats the caller's ref on subreq. + */ +static void netfs_read_cache_to_pagecache(struct netfs_io_request *rreq, + struct netfs_io_subrequest *subreq) +{ + struct netfs_cache_resources *cres = &rreq->cache_resources; - if (xas_retry(&xas, folio)) - continue; + netfs_stat(&netfs_n_rh_read); + cres->ops->read(cres, subreq->start, &subreq->io_iter, NETFS_READ_HOLE_IGNORE, + netfs_cache_read_terminated, subreq); +} - pg_end = folio_pos(folio) + folio_size(folio) - 1; +/* + * Perform a read to the pagecache from a series of sources of different types, + * slicing up the region to be read according to available cache blocks and + * network rsize. + */ +static void netfs_read_to_pagecache(struct netfs_io_request *rreq) +{ + struct netfs_inode *ictx = netfs_inode(rreq->inode); + unsigned long long start = rreq->start; + ssize_t size = rreq->len; + int ret = 0; + + atomic_inc(&rreq->nr_outstanding); + + do { + struct netfs_io_subrequest *subreq; + enum netfs_io_source source = NETFS_DOWNLOAD_FROM_SERVER; + ssize_t slice; + + subreq = netfs_alloc_subrequest(rreq); + if (!subreq) { + ret = -ENOMEM; + break; + } - for (;;) { - loff_t sreq_end; + subreq->start = start; + subreq->len = size; + + atomic_inc(&rreq->nr_outstanding); + spin_lock_bh(&rreq->lock); + list_add_tail(&subreq->rreq_link, &rreq->subrequests); + subreq->prev_donated = rreq->prev_donated; + rreq->prev_donated = 0; + trace_netfs_sreq(subreq, netfs_sreq_trace_added); + spin_unlock_bh(&rreq->lock); + + source = netfs_cache_prepare_read(rreq, subreq, rreq->i_size); + subreq->source = source; + if (source == NETFS_DOWNLOAD_FROM_SERVER) { + unsigned long long zp = umin(ictx->zero_point, rreq->i_size); + size_t len = subreq->len; + + if (subreq->start >= zp) { + subreq->source = source = NETFS_FILL_WITH_ZEROES; + goto fill_with_zeroes; + } - if (!subreq) { - pg_failed = true; + if (len > zp - subreq->start) + len = zp - subreq->start; + if (len == 0) { + pr_err("ZERO-LEN READ: R=%08x[%x] l=%zx/%zx s=%llx z=%llx i=%llx", + rreq->debug_id, subreq->debug_index, + subreq->len, size, + subreq->start, ictx->zero_point, rreq->i_size); break; } + subreq->len = len; + + netfs_stat(&netfs_n_rh_download); + if (rreq->netfs_ops->prepare_read) { + ret = rreq->netfs_ops->prepare_read(subreq); + if (ret < 0) { + atomic_dec(&rreq->nr_outstanding); + netfs_put_subrequest(subreq, false, + netfs_sreq_trace_put_cancel); + break; + } + trace_netfs_sreq(subreq, netfs_sreq_trace_prepare); + } - wback_to_cache |= test_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags); - pg_failed |= subreq_failed; - sreq_end = subreq->start + subreq->len - 1; - if (pg_end < sreq_end) + slice = netfs_prepare_read_iterator(subreq); + if (slice < 0) { + atomic_dec(&rreq->nr_outstanding); + netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_cancel); + ret = slice; break; - - account += subreq->transferred; - if (!list_is_last(&subreq->rreq_link, &rreq->subrequests)) { - subreq = list_next_entry(subreq, rreq_link); - subreq_failed = (subreq->error < 0); - } else { - subreq = NULL; - subreq_failed = false; } - if (pg_end == sreq_end) - break; + rreq->netfs_ops->issue_read(subreq); + goto done; } - if (!pg_failed) { - flush_dcache_folio(folio); - finfo = netfs_folio_info(folio); - if (finfo) { - trace_netfs_folio(folio, netfs_folio_trace_filled_gaps); - if (finfo->netfs_group) - folio_change_private(folio, finfo->netfs_group); - else - folio_detach_private(folio); - kfree(finfo); - } - folio_mark_uptodate(folio); - if (wback_to_cache && !WARN_ON_ONCE(folio_get_private(folio) != NULL)) { - trace_netfs_folio(folio, netfs_folio_trace_copy_to_cache); - folio_attach_private(folio, NETFS_FOLIO_COPY_TO_CACHE); - filemap_dirty_folio(folio->mapping, folio); - } + fill_with_zeroes: + if (source == NETFS_FILL_WITH_ZEROES) { + subreq->source = NETFS_FILL_WITH_ZEROES; + trace_netfs_sreq(subreq, netfs_sreq_trace_submit); + netfs_stat(&netfs_n_rh_zero); + slice = netfs_prepare_read_iterator(subreq); + __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); + netfs_read_subreq_terminated(subreq, 0, false); + goto done; } - if (!test_bit(NETFS_RREQ_DONT_UNLOCK_FOLIOS, &rreq->flags)) { - if (folio->index == rreq->no_unlock_folio && - test_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags)) - _debug("no unlock"); - else - folio_unlock(folio); + if (source == NETFS_READ_FROM_CACHE) { + trace_netfs_sreq(subreq, netfs_sreq_trace_submit); + slice = netfs_prepare_read_iterator(subreq); + netfs_read_cache_to_pagecache(rreq, subreq); + goto done; } - } - rcu_read_unlock(); -out: - task_io_account_read(account); - if (rreq->netfs_ops->done) - rreq->netfs_ops->done(rreq); -} + pr_err("Unexpected read source %u\n", source); + WARN_ON_ONCE(1); + break; -static void netfs_cache_expand_readahead(struct netfs_io_request *rreq, - unsigned long long *_start, - unsigned long long *_len, - unsigned long long i_size) -{ - struct netfs_cache_resources *cres = &rreq->cache_resources; + done: + size -= slice; + start += slice; + cond_resched(); + } while (size > 0); - if (cres->ops && cres->ops->expand_readahead) - cres->ops->expand_readahead(cres, _start, _len, i_size); + if (atomic_dec_and_test(&rreq->nr_outstanding)) + netfs_rreq_terminated(rreq, false); + + /* Defer error return as we may need to wait for outstanding I/O. */ + cmpxchg(&rreq->error, 0, ret); } -static void netfs_rreq_expand(struct netfs_io_request *rreq, - struct readahead_control *ractl) +/* + * Wait for the read operation to complete, successfully or otherwise. + */ +static int netfs_wait_for_read(struct netfs_io_request *rreq) { - /* Give the cache a chance to change the request parameters. The - * resultant request must contain the original region. - */ - netfs_cache_expand_readahead(rreq, &rreq->start, &rreq->len, rreq->i_size); + int ret; - /* Give the netfs a chance to change the request parameters. The - * resultant request must contain the original region. - */ - if (rreq->netfs_ops->expand_readahead) - rreq->netfs_ops->expand_readahead(rreq); + trace_netfs_rreq(rreq, netfs_rreq_trace_wait_ip); + wait_on_bit(&rreq->flags, NETFS_RREQ_IN_PROGRESS, TASK_UNINTERRUPTIBLE); + ret = rreq->error; + if (ret == 0 && rreq->submitted < rreq->len) { + trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_read); + ret = -EIO; + } - /* Expand the request if the cache wants it to start earlier. Note - * that the expansion may get further extended if the VM wishes to - * insert THPs and the preferred start and/or end wind up in the middle - * of THPs. - * - * If this is the case, however, the THP size should be an integer - * multiple of the cache granule size, so we get a whole number of - * granules to deal with. - */ - if (rreq->start != readahead_pos(ractl) || - rreq->len != readahead_length(ractl)) { - readahead_expand(ractl, rreq->start, rreq->len); - rreq->start = readahead_pos(ractl); - rreq->len = readahead_length(ractl); + return ret; +} - trace_netfs_read(rreq, readahead_pos(ractl), readahead_length(ractl), - netfs_read_trace_expanded); - } +/* + * Set up the initial folioq of buffer folios in the rolling buffer and set the + * iterator to refer to it. + */ +static int netfs_prime_buffer(struct netfs_io_request *rreq) +{ + struct folio_queue *folioq; + size_t added; + + folioq = kmalloc(sizeof(*folioq), GFP_KERNEL); + if (!folioq) + return -ENOMEM; + netfs_stat(&netfs_n_folioq); + folioq_init(folioq); + rreq->buffer = folioq; + rreq->buffer_tail = folioq; + rreq->submitted = rreq->start; + iov_iter_folio_queue(&rreq->iter, ITER_DEST, folioq, 0, 0, 0); + + added = netfs_load_buffer_from_ra(rreq, folioq); + rreq->iter.count += added; + rreq->submitted += added; + return 0; } /* - * Begin an operation, and fetch the stored zero point value from the cookie if - * available. + * Drop the ref on each folio that we inherited from the VM readahead code. We + * still have the folio locks to pin the page until we complete the I/O. + * + * Note that we can't just release the batch in each queue struct as we use the + * occupancy count in other places. */ -static int netfs_begin_cache_read(struct netfs_io_request *rreq, struct netfs_inode *ctx) +static void netfs_put_ra_refs(struct folio_queue *folioq) { - return fscache_begin_read_operation(&rreq->cache_resources, netfs_i_cookie(ctx)); + struct folio_batch fbatch; + + folio_batch_init(&fbatch); + while (folioq) { + for (unsigned int slot = 0; slot < folioq_count(folioq); slot++) { + struct folio *folio = folioq_folio(folioq, slot); + if (!folio) + continue; + trace_netfs_folio(folio, netfs_folio_trace_read_put); + if (!folio_batch_add(&fbatch, folio)) + folio_batch_release(&fbatch); + } + folioq = folioq->next; + } + + folio_batch_release(&fbatch); } /** @@ -289,22 +411,17 @@ static int netfs_begin_cache_read(struct netfs_io_request *rreq, struct netfs_in void netfs_readahead(struct readahead_control *ractl) { struct netfs_io_request *rreq; - struct netfs_inode *ctx = netfs_inode(ractl->mapping->host); + struct netfs_inode *ictx = netfs_inode(ractl->mapping->host); + unsigned long long start = readahead_pos(ractl); + size_t size = readahead_length(ractl); int ret; - _enter("%lx,%x", readahead_index(ractl), readahead_count(ractl)); - - if (readahead_count(ractl) == 0) - return; - - rreq = netfs_alloc_request(ractl->mapping, ractl->file, - readahead_pos(ractl), - readahead_length(ractl), + rreq = netfs_alloc_request(ractl->mapping, ractl->file, start, size, NETFS_READAHEAD); if (IS_ERR(rreq)) return; - ret = netfs_begin_cache_read(rreq, ctx); + ret = netfs_begin_cache_read(rreq, ictx); if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS) goto cleanup_free; @@ -314,18 +431,15 @@ void netfs_readahead(struct readahead_control *ractl) netfs_rreq_expand(rreq, ractl); - /* Set up the output buffer */ - iov_iter_xarray(&rreq->iter, ITER_DEST, &ractl->mapping->i_pages, - rreq->start, rreq->len); + rreq->ractl = ractl; + if (netfs_prime_buffer(rreq) < 0) + goto cleanup_free; + netfs_read_to_pagecache(rreq); - /* Drop the refs on the folios here rather than in the cache or - * filesystem. The locks will be dropped in netfs_rreq_unlock(). - */ - while (readahead_folio(ractl)) - ; + /* Release the folio refs whilst we're waiting for the I/O. */ + netfs_put_ra_refs(rreq->buffer); - netfs_begin_read(rreq, false); - netfs_put_request(rreq, false, netfs_rreq_trace_put_return); + netfs_put_request(rreq, true, netfs_rreq_trace_put_return); return; cleanup_free: @@ -334,6 +448,117 @@ cleanup_free: } EXPORT_SYMBOL(netfs_readahead); +/* + * Create a rolling buffer with a single occupying folio. + */ +static int netfs_create_singular_buffer(struct netfs_io_request *rreq, struct folio *folio) +{ + struct folio_queue *folioq; + + folioq = kmalloc(sizeof(*folioq), GFP_KERNEL); + if (!folioq) + return -ENOMEM; + + netfs_stat(&netfs_n_folioq); + folioq_init(folioq); + folioq_append(folioq, folio); + BUG_ON(folioq_folio(folioq, 0) != folio); + BUG_ON(folioq_folio_order(folioq, 0) != folio_order(folio)); + rreq->buffer = folioq; + rreq->buffer_tail = folioq; + rreq->submitted = rreq->start + rreq->len; + iov_iter_folio_queue(&rreq->iter, ITER_DEST, folioq, 0, 0, rreq->len); + rreq->ractl = (struct readahead_control *)1UL; + return 0; +} + +/* + * Read into gaps in a folio partially filled by a streaming write. + */ +static int netfs_read_gaps(struct file *file, struct folio *folio) +{ + struct netfs_io_request *rreq; + struct address_space *mapping = folio->mapping; + struct netfs_folio *finfo = netfs_folio_info(folio); + struct netfs_inode *ctx = netfs_inode(mapping->host); + struct folio *sink = NULL; + struct bio_vec *bvec; + unsigned int from = finfo->dirty_offset; + unsigned int to = from + finfo->dirty_len; + unsigned int off = 0, i = 0; + size_t flen = folio_size(folio); + size_t nr_bvec = flen / PAGE_SIZE + 2; + size_t part; + int ret; + + _enter("%lx", folio->index); + + rreq = netfs_alloc_request(mapping, file, folio_pos(folio), flen, NETFS_READ_GAPS); + if (IS_ERR(rreq)) { + ret = PTR_ERR(rreq); + goto alloc_error; + } + + ret = netfs_begin_cache_read(rreq, ctx); + if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS) + goto discard; + + netfs_stat(&netfs_n_rh_read_folio); + trace_netfs_read(rreq, rreq->start, rreq->len, netfs_read_trace_read_gaps); + + /* Fiddle the buffer so that a gap at the beginning and/or a gap at the + * end get copied to, but the middle is discarded. + */ + ret = -ENOMEM; + bvec = kmalloc_array(nr_bvec, sizeof(*bvec), GFP_KERNEL); + if (!bvec) + goto discard; + + sink = folio_alloc(GFP_KERNEL, 0); + if (!sink) { + kfree(bvec); + goto discard; + } + + trace_netfs_folio(folio, netfs_folio_trace_read_gaps); + + rreq->direct_bv = bvec; + rreq->direct_bv_count = nr_bvec; + if (from > 0) { + bvec_set_folio(&bvec[i++], folio, from, 0); + off = from; + } + while (off < to) { + part = min_t(size_t, to - off, PAGE_SIZE); + bvec_set_folio(&bvec[i++], sink, part, 0); + off += part; + } + if (to < flen) + bvec_set_folio(&bvec[i++], folio, flen - to, to); + iov_iter_bvec(&rreq->iter, ITER_DEST, bvec, i, rreq->len); + rreq->submitted = rreq->start + flen; + + netfs_read_to_pagecache(rreq); + + if (sink) + folio_put(sink); + + ret = netfs_wait_for_read(rreq); + if (ret == 0) { + flush_dcache_folio(folio); + folio_mark_uptodate(folio); + } + folio_unlock(folio); + netfs_put_request(rreq, false, netfs_rreq_trace_put_return); + return ret < 0 ? ret : 0; + +discard: + netfs_put_request(rreq, false, netfs_rreq_trace_put_discard); +alloc_error: + folio_unlock(folio); + return ret; +} + /** * netfs_read_folio - Helper to manage a read_folio request * @file: The file to read from @@ -353,9 +578,13 @@ int netfs_read_folio(struct file *file, struct folio *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; + if (folio_test_dirty(folio)) { + trace_netfs_folio(folio, netfs_folio_trace_read_gaps); + return netfs_read_gaps(file, folio); + } + _enter("%lx", folio->index); rreq = netfs_alloc_request(mapping, file, @@ -374,54 +603,12 @@ int netfs_read_folio(struct file *file, struct folio *folio) trace_netfs_read(rreq, rreq->start, rreq->len, netfs_read_trace_readpage); /* Set up the output buffer */ - if (folio_test_dirty(folio)) { - /* Handle someone trying to read from an unflushed streaming - * write. We fiddle the buffer so that a gap at the beginning - * and/or a gap at the end get copied to, but the middle is - * discarded. - */ - struct netfs_folio *finfo = netfs_folio_info(folio); - struct bio_vec *bvec; - unsigned int from = finfo->dirty_offset; - unsigned int to = from + finfo->dirty_len; - unsigned int off = 0, i = 0; - size_t flen = folio_size(folio); - size_t nr_bvec = flen / PAGE_SIZE + 2; - size_t part; - - ret = -ENOMEM; - bvec = kmalloc_array(nr_bvec, sizeof(*bvec), GFP_KERNEL); - if (!bvec) - goto discard; - - sink = folio_alloc(GFP_KERNEL, 0); - if (!sink) - goto discard; - - trace_netfs_folio(folio, netfs_folio_trace_read_gaps); - - rreq->direct_bv = bvec; - rreq->direct_bv_count = nr_bvec; - if (from > 0) { - bvec_set_folio(&bvec[i++], folio, from, 0); - off = from; - } - while (off < to) { - part = min_t(size_t, to - off, PAGE_SIZE); - bvec_set_folio(&bvec[i++], sink, part, 0); - off += part; - } - if (to < flen) - bvec_set_folio(&bvec[i++], folio, flen - to, to); - iov_iter_bvec(&rreq->iter, ITER_DEST, bvec, i, rreq->len); - } else { - iov_iter_xarray(&rreq->iter, ITER_DEST, &mapping->i_pages, - rreq->start, rreq->len); - } + ret = netfs_create_singular_buffer(rreq, folio); + if (ret < 0) + goto discard; - ret = netfs_begin_read(rreq, true); - if (sink) - folio_put(sink); + netfs_read_to_pagecache(rreq); + ret = netfs_wait_for_read(rreq); netfs_put_request(rreq, false, netfs_rreq_trace_put_return); return ret < 0 ? ret : 0; @@ -494,13 +681,10 @@ zero_out: * * Pre-read data for a write-begin request by drawing data from the cache if * possible, or the netfs if not. Space beyond the EOF is zero-filled. - * Multiple I/O requests from different sources will get munged together. If - * necessary, the readahead window can be expanded in either direction to a - * more convenient alighment for RPC efficiency or to make storage in the cache - * feasible. + * Multiple I/O requests from different sources will get munged together. * * The calling netfs must provide a table of operations, only one of which, - * issue_op, is mandatory. + * issue_read, is mandatory. * * The check_write_begin() operation can be provided to check for and flush * conflicting writes once the folio is grabbed and locked. It is passed a @@ -528,8 +712,6 @@ int netfs_write_begin(struct netfs_inode *ctx, pgoff_t index = pos >> PAGE_SHIFT; int ret; - DEFINE_READAHEAD(ractl, file, NULL, mapping, index); - retry: folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN, mapping_gfp_mask(mapping)); @@ -577,22 +759,13 @@ retry: netfs_stat(&netfs_n_rh_write_begin); trace_netfs_read(rreq, pos, len, netfs_read_trace_write_begin); - /* Expand the request to meet caching requirements and download - * preferences. - */ - ractl._nr_pages = folio_nr_pages(folio); - netfs_rreq_expand(rreq, &ractl); - /* Set up the output buffer */ - iov_iter_xarray(&rreq->iter, ITER_DEST, &mapping->i_pages, - rreq->start, rreq->len); - - /* We hold the folio locks, so we can drop the references */ - folio_get(folio); - while (readahead_folio(&ractl)) - ; + ret = netfs_create_singular_buffer(rreq, folio); + if (ret < 0) + goto error_put; - ret = netfs_begin_read(rreq, true); + netfs_read_to_pagecache(rreq); + ret = netfs_wait_for_read(rreq); if (ret < 0) goto error; netfs_put_request(rreq, false, netfs_rreq_trace_put_return); @@ -652,10 +825,13 @@ int netfs_prefetch_for_write(struct file *file, struct folio *folio, trace_netfs_read(rreq, start, flen, netfs_read_trace_prefetch_for_write); /* Set up the output buffer */ - iov_iter_xarray(&rreq->iter, ITER_DEST, &mapping->i_pages, - rreq->start, rreq->len); + ret = netfs_create_singular_buffer(rreq, folio); + if (ret < 0) + goto error_put; - ret = netfs_begin_read(rreq, true); + folioq_mark2(rreq->buffer, 0); + netfs_read_to_pagecache(rreq); + ret = netfs_wait_for_read(rreq); netfs_put_request(rreq, false, netfs_rreq_trace_put_return); return ret; diff --git a/fs/netfs/direct_read.c b/fs/netfs/direct_read.c index 10a1e4da6bda..b1a66a6e6bc2 100644 --- a/fs/netfs/direct_read.c +++ b/fs/netfs/direct_read.c @@ -16,6 +16,143 @@ #include <linux/netfs.h> #include "internal.h" +static void netfs_prepare_dio_read_iterator(struct netfs_io_subrequest *subreq) +{ + struct netfs_io_request *rreq = subreq->rreq; + size_t rsize; + + rsize = umin(subreq->len, rreq->io_streams[0].sreq_max_len); + subreq->len = rsize; + + if (unlikely(rreq->io_streams[0].sreq_max_segs)) { + size_t limit = netfs_limit_iter(&rreq->iter, 0, rsize, + rreq->io_streams[0].sreq_max_segs); + + if (limit < rsize) { + subreq->len = limit; + trace_netfs_sreq(subreq, netfs_sreq_trace_limited); + } + } + + trace_netfs_sreq(subreq, netfs_sreq_trace_prepare); + + subreq->io_iter = rreq->iter; + iov_iter_truncate(&subreq->io_iter, subreq->len); + iov_iter_advance(&rreq->iter, subreq->len); +} + +/* + * Perform a read to a buffer from the server, slicing up the region to be read + * according to the network rsize. + */ +static int netfs_dispatch_unbuffered_reads(struct netfs_io_request *rreq) +{ + unsigned long long start = rreq->start; + ssize_t size = rreq->len; + int ret = 0; + + atomic_set(&rreq->nr_outstanding, 1); + + do { + struct netfs_io_subrequest *subreq; + ssize_t slice; + + subreq = netfs_alloc_subrequest(rreq); + if (!subreq) { + ret = -ENOMEM; + break; + } + + subreq->source = NETFS_DOWNLOAD_FROM_SERVER; + subreq->start = start; + subreq->len = size; + + atomic_inc(&rreq->nr_outstanding); + spin_lock_bh(&rreq->lock); + list_add_tail(&subreq->rreq_link, &rreq->subrequests); + subreq->prev_donated = rreq->prev_donated; + rreq->prev_donated = 0; + trace_netfs_sreq(subreq, netfs_sreq_trace_added); + spin_unlock_bh(&rreq->lock); + + netfs_stat(&netfs_n_rh_download); + if (rreq->netfs_ops->prepare_read) { + ret = rreq->netfs_ops->prepare_read(subreq); + if (ret < 0) { + atomic_dec(&rreq->nr_outstanding); + netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_cancel); + break; + } + } + + netfs_prepare_dio_read_iterator(subreq); + slice = subreq->len; + rreq->netfs_ops->issue_read(subreq); + + size -= slice; + start += slice; + rreq->submitted += slice; + + if (test_bit(NETFS_RREQ_BLOCKED, &rreq->flags) && + test_bit(NETFS_RREQ_NONBLOCK, &rreq->flags)) + break; + cond_resched(); + } while (size > 0); + + if (atomic_dec_and_test(&rreq->nr_outstanding)) + netfs_rreq_terminated(rreq, false); + return ret; +} + +/* + * Perform a read to an application buffer, bypassing the pagecache and the + * local disk cache. + */ +static int netfs_unbuffered_read(struct netfs_io_request *rreq, bool sync) +{ + int ret; + + _enter("R=%x %llx-%llx", + rreq->debug_id, rreq->start, rreq->start + rreq->len - 1); + + if (rreq->len == 0) { + pr_err("Zero-sized read [R=%x]\n", rreq->debug_id); + return -EIO; + } + + // TODO: Use bounce buffer if requested + + inode_dio_begin(rreq->inode); + + ret = netfs_dispatch_unbuffered_reads(rreq); + + if (!rreq->submitted) { + netfs_put_request(rreq, false, netfs_rreq_trace_put_no_submit); + inode_dio_end(rreq->inode); + ret = 0; + goto out; + } + + if (sync) { + trace_netfs_rreq(rreq, netfs_rreq_trace_wait_ip); + wait_on_bit(&rreq->flags, NETFS_RREQ_IN_PROGRESS, + TASK_UNINTERRUPTIBLE); + + ret = rreq->error; + if (ret == 0 && rreq->submitted < rreq->len && + rreq->origin != NETFS_DIO_READ) { + trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_read); + ret = -EIO; + } + } else { + ret = -EIOCBQUEUED; + } + +out: + _leave(" = %d", ret); + return ret; +} + /** * netfs_unbuffered_read_iter_locked - Perform an unbuffered or direct I/O read * @iocb: The I/O control descriptor describing the read @@ -31,7 +168,7 @@ ssize_t netfs_unbuffered_read_iter_locked(struct kiocb *iocb, struct iov_iter *i struct netfs_io_request *rreq; ssize_t ret; size_t orig_count = iov_iter_count(iter); - bool async = !is_sync_kiocb(iocb); + bool sync = is_sync_kiocb(iocb); _enter(""); @@ -78,13 +215,13 @@ ssize_t netfs_unbuffered_read_iter_locked(struct kiocb *iocb, struct iov_iter *i // TODO: Set up bounce buffer if needed - if (async) + if (!sync) rreq->iocb = iocb; - ret = netfs_begin_read(rreq, is_sync_kiocb(iocb)); + ret = netfs_unbuffered_read(rreq, sync); if (ret < 0) goto out; /* May be -EIOCBQUEUED */ - if (!async) { + if (sync) { // TODO: Copy from bounce buffer iocb->ki_pos += rreq->transferred; ret = rreq->transferred; @@ -94,8 +231,6 @@ out: netfs_put_request(rreq, false, netfs_rreq_trace_put_return); if (ret > 0) orig_count -= ret; - if (ret != -EIOCBQUEUED) - iov_iter_revert(iter, orig_count - iov_iter_count(iter)); return ret; } EXPORT_SYMBOL(netfs_unbuffered_read_iter_locked); diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index 21a3c7d13585..c9f0ed24cb7b 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -23,17 +23,10 @@ /* * buffered_read.c */ -void netfs_rreq_unlock_folios(struct netfs_io_request *rreq); int netfs_prefetch_for_write(struct file *file, struct folio *folio, size_t offset, size_t len); /* - * io.c - */ -void netfs_rreq_work(struct work_struct *work); -int netfs_begin_read(struct netfs_io_request *rreq, bool sync); - -/* * main.c */ extern unsigned int netfs_debug; @@ -91,6 +84,28 @@ static inline void netfs_see_request(struct netfs_io_request *rreq, } /* + * read_collect.c + */ +void netfs_read_termination_worker(struct work_struct *work); +void netfs_rreq_terminated(struct netfs_io_request *rreq, bool was_async); + +/* + * read_pgpriv2.c + */ +void netfs_pgpriv2_mark_copy_to_cache(struct netfs_io_subrequest *subreq, + struct netfs_io_request *rreq, + struct folio_queue *folioq, + int slot); +void netfs_pgpriv2_write_to_the_cache(struct netfs_io_request *rreq); +bool netfs_pgpriv2_unlock_copied_folios(struct netfs_io_request *wreq); + +/* + * read_retry.c + */ +void netfs_retry_reads(struct netfs_io_request *rreq); +void netfs_unlock_abandoned_read_pages(struct netfs_io_request *rreq); + +/* * stats.c */ #ifdef CONFIG_NETFS_STATS @@ -117,6 +132,7 @@ extern atomic_t netfs_n_wh_buffered_write; extern atomic_t netfs_n_wh_writethrough; extern atomic_t netfs_n_wh_dio_write; extern atomic_t netfs_n_wh_writepages; +extern atomic_t netfs_n_wh_copy_to_cache; extern atomic_t netfs_n_wh_wstream_conflict; extern atomic_t netfs_n_wh_upload; extern atomic_t netfs_n_wh_upload_done; @@ -162,6 +178,11 @@ struct netfs_io_request *netfs_create_write_req(struct address_space *mapping, void netfs_reissue_write(struct netfs_io_stream *stream, struct netfs_io_subrequest *subreq, struct iov_iter *source); +void netfs_issue_write(struct netfs_io_request *wreq, + 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 *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, diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c index b781bbbf1d8d..72a435e5fc6d 100644 --- a/fs/netfs/iterator.c +++ b/fs/netfs/iterator.c @@ -188,9 +188,59 @@ static size_t netfs_limit_xarray(const struct iov_iter *iter, size_t start_offse return min(span, max_size); } +/* + * Select the span of a folio queue iterator we're going to use. Limit it by + * both maximum size and maximum number of segments. Returns the size of the + * span in bytes. + */ +static size_t netfs_limit_folioq(const struct iov_iter *iter, size_t start_offset, + size_t max_size, size_t max_segs) +{ + const struct folio_queue *folioq = iter->folioq; + unsigned int nsegs = 0; + unsigned int slot = iter->folioq_slot; + size_t span = 0, n = iter->count; + + if (WARN_ON(!iov_iter_is_folioq(iter)) || + WARN_ON(start_offset > n) || + n == 0) + return 0; + max_size = umin(max_size, n - start_offset); + + if (slot >= folioq_nr_slots(folioq)) { + folioq = folioq->next; + slot = 0; + } + + start_offset += iter->iov_offset; + do { + size_t flen = folioq_folio_size(folioq, slot); + + if (start_offset < flen) { + span += flen - start_offset; + nsegs++; + start_offset = 0; + } else { + start_offset -= flen; + } + if (span >= max_size || nsegs >= max_segs) + break; + + slot++; + if (slot >= folioq_nr_slots(folioq)) { + folioq = folioq->next; + slot = 0; + } + } while (folioq); + + return umin(span, max_size); +} + size_t netfs_limit_iter(const struct iov_iter *iter, size_t start_offset, size_t max_size, size_t max_segs) { + if (iov_iter_is_folioq(iter)) + return netfs_limit_folioq(iter, start_offset, max_size, max_segs); if (iov_iter_is_bvec(iter)) return netfs_limit_bvec(iter, start_offset, max_size, max_segs); if (iov_iter_is_xarray(iter)) diff --git a/fs/netfs/main.c b/fs/netfs/main.c index 1ee712bb3610..4f7212ca3470 100644 --- a/fs/netfs/main.c +++ b/fs/netfs/main.c @@ -36,12 +36,14 @@ DEFINE_SPINLOCK(netfs_proc_lock); static const char *netfs_origins[nr__netfs_io_origin] = { [NETFS_READAHEAD] = "RA", [NETFS_READPAGE] = "RP", + [NETFS_READ_GAPS] = "RG", [NETFS_READ_FOR_WRITE] = "RW", [NETFS_DIO_READ] = "DR", [NETFS_WRITEBACK] = "WB", [NETFS_WRITETHROUGH] = "WT", [NETFS_UNBUFFERED_WRITE] = "UW", [NETFS_DIO_WRITE] = "DW", + [NETFS_PGPRIV2_COPY_TO_CACHE] = "2C", }; /* @@ -61,7 +63,7 @@ static int netfs_requests_seq_show(struct seq_file *m, void *v) rreq = list_entry(v, struct netfs_io_request, proc_link); seq_printf(m, - "%08x %s %3d %2lx %4d %3d @%04llx %llx/%llx", + "%08x %s %3d %2lx %4ld %3d @%04llx %llx/%llx", rreq->debug_id, netfs_origins[rreq->origin], refcount_read(&rreq->ref), diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c index 4291cd405fc1..31e388ec6e48 100644 --- a/fs/netfs/objects.c +++ b/fs/netfs/objects.c @@ -36,7 +36,6 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, memset(rreq, 0, kmem_cache_size(cache)); rreq->start = start; rreq->len = len; - rreq->upper_len = len; rreq->origin = origin; rreq->netfs_ops = ctx->ops; rreq->mapping = mapping; @@ -44,6 +43,8 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, rreq->i_size = i_size_read(inode); rreq->debug_id = atomic_inc_return(&debug_ids); rreq->wsize = INT_MAX; + rreq->io_streams[0].sreq_max_len = ULONG_MAX; + rreq->io_streams[0].sreq_max_segs = 0; spin_lock_init(&rreq->lock); INIT_LIST_HEAD(&rreq->io_streams[0].subrequests); INIT_LIST_HEAD(&rreq->io_streams[1].subrequests); @@ -52,9 +53,10 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, if (origin == NETFS_READAHEAD || origin == NETFS_READPAGE || + origin == NETFS_READ_GAPS || origin == NETFS_READ_FOR_WRITE || origin == NETFS_DIO_READ) - INIT_WORK(&rreq->work, netfs_rreq_work); + INIT_WORK(&rreq->work, netfs_read_termination_worker); else INIT_WORK(&rreq->work, netfs_write_collection_worker); @@ -163,7 +165,7 @@ void netfs_put_request(struct netfs_io_request *rreq, bool was_async, if (was_async) { rreq->work.func = netfs_free_request; if (!queue_work(system_unbound_wq, &rreq->work)) - BUG(); + WARN_ON(1); } else { netfs_free_request(&rreq->work); } diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c new file mode 100644 index 000000000000..b18c65ba5580 --- /dev/null +++ b/fs/netfs/read_collect.c @@ -0,0 +1,544 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Network filesystem read subrequest result collection, assessment and + * retrying. + * + * Copyright (C) 2024 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include <linux/export.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/pagemap.h> +#include <linux/slab.h> +#include <linux/task_io_accounting_ops.h> +#include "internal.h" + +/* + * Clear the unread part of an I/O request. + */ +static void netfs_clear_unread(struct netfs_io_subrequest *subreq) +{ + netfs_reset_iter(subreq); + WARN_ON_ONCE(subreq->len - subreq->transferred != iov_iter_count(&subreq->io_iter)); + iov_iter_zero(iov_iter_count(&subreq->io_iter), &subreq->io_iter); + if (subreq->start + subreq->transferred >= subreq->rreq->i_size) + __set_bit(NETFS_SREQ_HIT_EOF, &subreq->flags); +} + +/* + * Flush, mark and unlock a folio that's now completely read. If we want to + * cache the folio, we set the group to NETFS_FOLIO_COPY_TO_CACHE, mark it + * dirty and let writeback handle it. + */ +static void netfs_unlock_read_folio(struct netfs_io_subrequest *subreq, + struct netfs_io_request *rreq, + struct folio_queue *folioq, + int slot) +{ + struct netfs_folio *finfo; + struct folio *folio = folioq_folio(folioq, slot); + + flush_dcache_folio(folio); + folio_mark_uptodate(folio); + + if (!test_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags)) { + finfo = netfs_folio_info(folio); + if (finfo) { + trace_netfs_folio(folio, netfs_folio_trace_filled_gaps); + if (finfo->netfs_group) + folio_change_private(folio, finfo->netfs_group); + else + folio_detach_private(folio); + kfree(finfo); + } + + if (test_bit(NETFS_SREQ_COPY_TO_CACHE, &subreq->flags)) { + if (!WARN_ON_ONCE(folio_get_private(folio) != NULL)) { + trace_netfs_folio(folio, netfs_folio_trace_copy_to_cache); + folio_attach_private(folio, NETFS_FOLIO_COPY_TO_CACHE); + folio_mark_dirty(folio); + } + } else { + trace_netfs_folio(folio, netfs_folio_trace_read_done); + } + } 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); + } + + if (!test_bit(NETFS_RREQ_DONT_UNLOCK_FOLIOS, &rreq->flags)) { + if (folio->index == rreq->no_unlock_folio && + test_bit(NETFS_RREQ_NO_UNLOCK_FOLIO, &rreq->flags)) { + _debug("no unlock"); + } else { + trace_netfs_folio(folio, netfs_folio_trace_read_unlock); + folio_unlock(folio); + } + } +} + +/* + * Unlock any folios that are now completely read. Returns true if the + * subrequest is removed from the list. + */ +static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq, bool was_async) +{ + struct netfs_io_subrequest *prev, *next; + struct netfs_io_request *rreq = subreq->rreq; + struct folio_queue *folioq = subreq->curr_folioq; + size_t avail, prev_donated, next_donated, fsize, part, excess; + loff_t fpos, start; + loff_t fend; + int slot = subreq->curr_folioq_slot; + + if (WARN(subreq->transferred > subreq->len, + "Subreq overread: R%x[%x] %zu > %zu", + rreq->debug_id, subreq->debug_index, + subreq->transferred, subreq->len)) + subreq->transferred = subreq->len; + +next_folio: + fsize = PAGE_SIZE << subreq->curr_folio_order; + fpos = round_down(subreq->start + subreq->consumed, fsize); + fend = fpos + fsize; + + if (WARN_ON_ONCE(!folioq) || + WARN_ON_ONCE(!folioq_folio(folioq, slot)) || + WARN_ON_ONCE(folioq_folio(folioq, slot)->index != fpos / PAGE_SIZE)) { + pr_err("R=%08x[%x] s=%llx-%llx ctl=%zx/%zx/%zx sl=%u\n", + rreq->debug_id, subreq->debug_index, + subreq->start, subreq->start + subreq->transferred - 1, + subreq->consumed, subreq->transferred, subreq->len, + slot); + if (folioq) { + struct folio *folio = folioq_folio(folioq, slot); + + pr_err("folioq: orders=%02x%02x%02x%02x\n", + folioq->orders[0], folioq->orders[1], + folioq->orders[2], folioq->orders[3]); + if (folio) + pr_err("folio: %llx-%llx ix=%llx o=%u qo=%u\n", + fpos, fend - 1, folio_pos(folio), folio_order(folio), + folioq_folio_order(folioq, slot)); + } + } + +donation_changed: + /* Try to consume the current folio if we've hit or passed the end of + * it. There's a possibility that this subreq doesn't start at the + * beginning of the folio, in which case we need to donate to/from the + * preceding subreq. + * + * We also need to include any potential donation back from the + * following subreq. + */ + prev_donated = READ_ONCE(subreq->prev_donated); + next_donated = READ_ONCE(subreq->next_donated); + if (prev_donated || next_donated) { + spin_lock_bh(&rreq->lock); + prev_donated = subreq->prev_donated; + next_donated = subreq->next_donated; + subreq->start -= prev_donated; + subreq->len += prev_donated; + subreq->transferred += prev_donated; + prev_donated = subreq->prev_donated = 0; + if (subreq->transferred == subreq->len) { + subreq->len += next_donated; + subreq->transferred += next_donated; + next_donated = subreq->next_donated = 0; + } + trace_netfs_sreq(subreq, netfs_sreq_trace_add_donations); + spin_unlock_bh(&rreq->lock); + } + + avail = subreq->transferred; + if (avail == subreq->len) + avail += next_donated; + start = subreq->start; + if (subreq->consumed == 0) { + start -= prev_donated; + avail += prev_donated; + } else { + start += subreq->consumed; + avail -= subreq->consumed; + } + part = umin(avail, fsize); + + trace_netfs_progress(subreq, start, avail, part); + + if (start + avail >= fend) { + if (fpos == start) { + /* Flush, unlock and mark for caching any folio we've just read. */ + subreq->consumed = fend - subreq->start; + netfs_unlock_read_folio(subreq, rreq, folioq, slot); + folioq_mark2(folioq, slot); + if (subreq->consumed >= subreq->len) + goto remove_subreq; + } else if (fpos < start) { + excess = fend - subreq->start; + + spin_lock_bh(&rreq->lock); + /* If we complete first on a folio split with the + * preceding subreq, donate to that subreq - otherwise + * we get the responsibility. + */ + if (subreq->prev_donated != prev_donated) { + spin_unlock_bh(&rreq->lock); + goto donation_changed; + } + + if (list_is_first(&subreq->rreq_link, &rreq->subrequests)) { + spin_unlock_bh(&rreq->lock); + pr_err("Can't donate prior to front\n"); + goto bad; + } + + prev = list_prev_entry(subreq, rreq_link); + WRITE_ONCE(prev->next_donated, prev->next_donated + excess); + subreq->start += excess; + subreq->len -= excess; + subreq->transferred -= excess; + trace_netfs_donate(rreq, subreq, prev, excess, + netfs_trace_donate_tail_to_prev); + trace_netfs_sreq(subreq, netfs_sreq_trace_donate_to_prev); + + if (subreq->consumed >= subreq->len) + goto remove_subreq_locked; + spin_unlock_bh(&rreq->lock); + } else { + pr_err("fpos > start\n"); + goto bad; + } + + /* Advance the rolling buffer to the next folio. */ + slot++; + if (slot >= folioq_nr_slots(folioq)) { + slot = 0; + folioq = folioq->next; + subreq->curr_folioq = folioq; + } + subreq->curr_folioq_slot = slot; + if (folioq && folioq_folio(folioq, slot)) + subreq->curr_folio_order = folioq->orders[slot]; + if (!was_async) + cond_resched(); + goto next_folio; + } + + /* Deal with partial progress. */ + if (subreq->transferred < subreq->len) + return false; + + /* Donate the remaining downloaded data to one of the neighbouring + * subrequests. Note that we may race with them doing the same thing. + */ + spin_lock_bh(&rreq->lock); + + if (subreq->prev_donated != prev_donated || + subreq->next_donated != next_donated) { + spin_unlock_bh(&rreq->lock); + cond_resched(); + goto donation_changed; + } + + /* 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 + * donation is only handled when that completes - 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)) { + prev = list_prev_entry(subreq, rreq_link); + WRITE_ONCE(prev->next_donated, prev->next_donated + subreq->len); + subreq->start += subreq->len; + subreq->len = 0; + subreq->transferred = 0; + trace_netfs_donate(rreq, subreq, prev, subreq->len, + netfs_trace_donate_to_prev); + trace_netfs_sreq(subreq, netfs_sreq_trace_donate_to_prev); + goto remove_subreq_locked; + } + + /* If we can't donate down the chain, donate up the chain instead. */ + excess = subreq->len - subreq->consumed + next_donated; + + if (!subreq->consumed) + excess += prev_donated; + + if (list_is_last(&subreq->rreq_link, &rreq->subrequests)) { + rreq->prev_donated = excess; + trace_netfs_donate(rreq, subreq, NULL, excess, + netfs_trace_donate_to_deferred_next); + } else { + next = list_next_entry(subreq, rreq_link); + WRITE_ONCE(next->prev_donated, excess); + trace_netfs_donate(rreq, subreq, next, excess, + netfs_trace_donate_to_next); + } + trace_netfs_sreq(subreq, netfs_sreq_trace_donate_to_next); + subreq->len = subreq->consumed; + subreq->transferred = subreq->consumed; + goto remove_subreq_locked; + +remove_subreq: + spin_lock_bh(&rreq->lock); +remove_subreq_locked: + subreq->consumed = subreq->len; + list_del(&subreq->rreq_link); + spin_unlock_bh(&rreq->lock); + netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_consumed); + return true; + +bad: + /* Errr... prev and next both donated to us, but insufficient to finish + * the folio. + */ + printk("R=%08x[%x] s=%llx-%llx %zx/%zx/%zx\n", + rreq->debug_id, subreq->debug_index, + subreq->start, subreq->start + subreq->transferred - 1, + subreq->consumed, subreq->transferred, subreq->len); + printk("folio: %llx-%llx\n", fpos, fend - 1); + printk("donated: prev=%zx next=%zx\n", prev_donated, next_donated); + printk("s=%llx av=%zx part=%zx\n", start, avail, part); + BUG(); +} + +/* + * Do page flushing and suchlike after DIO. + */ +static void netfs_rreq_assess_dio(struct netfs_io_request *rreq) +{ + struct netfs_io_subrequest *subreq; + unsigned int i; + + /* Collect unbuffered reads and direct reads, adding up the transfer + * sizes until we find the first short or failed subrequest. + */ + list_for_each_entry(subreq, &rreq->subrequests, rreq_link) { + rreq->transferred += subreq->transferred; + + if (subreq->transferred < subreq->len || + test_bit(NETFS_SREQ_FAILED, &subreq->flags)) { + rreq->error = subreq->error; + break; + } + } + + if (rreq->origin == NETFS_DIO_READ) { + for (i = 0; i < rreq->direct_bv_count; i++) { + flush_dcache_page(rreq->direct_bv[i].bv_page); + // TODO: cifs marks pages in the destination buffer + // dirty under some circumstances after a read. Do we + // need to do that too? + set_page_dirty(rreq->direct_bv[i].bv_page); + } + } + + if (rreq->iocb) { + rreq->iocb->ki_pos += rreq->transferred; + if (rreq->iocb->ki_complete) + rreq->iocb->ki_complete( + rreq->iocb, rreq->error ? rreq->error : rreq->transferred); + } + if (rreq->netfs_ops->done) + rreq->netfs_ops->done(rreq); + if (rreq->origin == NETFS_DIO_READ) + inode_dio_end(rreq->inode); +} + +/* + * Assess the state of a read request and decide what to do next. + * + * Note that we're in normal kernel thread context at this point, possibly + * running on a workqueue. + */ +static void netfs_rreq_assess(struct netfs_io_request *rreq) +{ + trace_netfs_rreq(rreq, netfs_rreq_trace_assess); + + //netfs_rreq_is_still_valid(rreq); + + if (test_and_clear_bit(NETFS_RREQ_NEED_RETRY, &rreq->flags)) { + netfs_retry_reads(rreq); + return; + } + + if (rreq->origin == NETFS_DIO_READ || + rreq->origin == NETFS_READ_GAPS) + netfs_rreq_assess_dio(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); + wake_up_bit(&rreq->flags, NETFS_RREQ_IN_PROGRESS); + + trace_netfs_rreq(rreq, netfs_rreq_trace_done); + netfs_clear_subrequests(rreq, false); + netfs_unlock_abandoned_read_pages(rreq); + if (unlikely(test_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags))) + netfs_pgpriv2_write_to_the_cache(rreq); +} + +void netfs_read_termination_worker(struct work_struct *work) +{ + struct netfs_io_request *rreq = + container_of(work, struct netfs_io_request, work); + netfs_see_request(rreq, netfs_rreq_trace_see_work); + netfs_rreq_assess(rreq); + netfs_put_request(rreq, false, netfs_rreq_trace_put_work_complete); +} + +/* + * Handle the completion of all outstanding I/O operations on a read request. + * We inherit a ref from the caller. + */ +void netfs_rreq_terminated(struct netfs_io_request *rreq, bool was_async) +{ + if (!was_async) + return netfs_rreq_assess(rreq); + if (!work_pending(&rreq->work)) { + netfs_get_request(rreq, netfs_rreq_trace_get_work); + if (!queue_work(system_unbound_wq, &rreq->work)) + netfs_put_request(rreq, was_async, netfs_rreq_trace_put_work_nq); + } +} + +/** + * netfs_read_subreq_progress - Note progress of a read operation. + * @subreq: The read request that has terminated. + * @was_async: True if we're in an asynchronous context. + * + * This tells the read side of netfs lib that a contributory I/O operation has + * made some progress and that it may be possible to unlock some folios. + * + * Before calling, the filesystem should update subreq->transferred to track + * the amount of data copied into the output buffer. + * + * If @was_async is true, the caller might be running in softirq or interrupt + * context and we can't sleep. + */ +void netfs_read_subreq_progress(struct netfs_io_subrequest *subreq, + bool was_async) +{ + struct netfs_io_request *rreq = subreq->rreq; + + trace_netfs_sreq(subreq, netfs_sreq_trace_progress); + + if (subreq->transferred > subreq->consumed && + (rreq->origin == NETFS_READAHEAD || + 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); + } +} +EXPORT_SYMBOL(netfs_read_subreq_progress); + +/** + * netfs_read_subreq_terminated - Note the termination of an I/O operation. + * @subreq: The I/O request that has terminated. + * @error: Error code indicating type of completion. + * @was_async: The termination was asynchronous + * + * This tells the read helper that a contributory I/O operation has terminated, + * one way or another, and that it should integrate the results. + * + * The caller indicates the outcome of the operation through @error, supplying + * 0 to indicate a successful or retryable transfer (if NETFS_SREQ_NEED_RETRY + * is set) or a negative error code. The helper will look after reissuing I/O + * operations as appropriate and writing downloaded data to the cache. + * + * Before calling, the filesystem should update subreq->transferred to track + * the amount of data copied into the output buffer. + * + * If @was_async is true, the caller might be running in softirq or interrupt + * context and we can't sleep. + */ +void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq, + int error, bool was_async) +{ + struct netfs_io_request *rreq = subreq->rreq; + + switch (subreq->source) { + case NETFS_READ_FROM_CACHE: + netfs_stat(&netfs_n_rh_read_done); + break; + case NETFS_DOWNLOAD_FROM_SERVER: + netfs_stat(&netfs_n_rh_download_done); + break; + default: + break; + } + + if (rreq->origin != NETFS_DIO_READ) { + /* Collect buffered reads. + * + * If the read completed validly short, then we can clear the + * tail before going on to unlock the folios. + */ + if (error == 0 && subreq->transferred < subreq->len && + (test_bit(NETFS_SREQ_HIT_EOF, &subreq->flags) || + test_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags))) { + netfs_clear_unread(subreq); + subreq->transferred = subreq->len; + trace_netfs_sreq(subreq, netfs_sreq_trace_clear); + } + if (subreq->transferred > subreq->consumed && + (rreq->origin == NETFS_READAHEAD || + 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); + } + rreq->transferred += subreq->transferred; + } + + /* Deal with retry requests, short reads and errors. If we retry + * but don't make progress, we abandon the attempt. + */ + if (!error && subreq->transferred < subreq->len) { + if (test_bit(NETFS_SREQ_HIT_EOF, &subreq->flags)) { + trace_netfs_sreq(subreq, netfs_sreq_trace_hit_eof); + } else { + trace_netfs_sreq(subreq, netfs_sreq_trace_short); + if (subreq->transferred > subreq->consumed) { + __set_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); + __clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags); + set_bit(NETFS_RREQ_NEED_RETRY, &rreq->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 { + __set_bit(NETFS_SREQ_FAILED, &subreq->flags); + error = -ENODATA; + } + } + } + + subreq->error = error; + trace_netfs_sreq(subreq, netfs_sreq_trace_terminated); + + if (unlikely(error < 0)) { + trace_netfs_failure(rreq, subreq, error, netfs_fail_read); + if (subreq->source == NETFS_READ_FROM_CACHE) { + netfs_stat(&netfs_n_rh_read_failed); + } else { + netfs_stat(&netfs_n_rh_download_failed); + set_bit(NETFS_RREQ_FAILED, &rreq->flags); + rreq->error = subreq->error; + } + } + + if (atomic_dec_and_test(&rreq->nr_outstanding)) + netfs_rreq_terminated(rreq, was_async); + + netfs_put_subrequest(subreq, was_async, netfs_sreq_trace_put_terminated); +} +EXPORT_SYMBOL(netfs_read_subreq_terminated); diff --git a/fs/netfs/read_pgpriv2.c b/fs/netfs/read_pgpriv2.c new file mode 100644 index 000000000000..9439461d535f --- /dev/null +++ b/fs/netfs/read_pgpriv2.c @@ -0,0 +1,264 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Read with PG_private_2 [DEPRECATED]. + * + * Copyright (C) 2024 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include <linux/export.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/pagemap.h> +#include <linux/slab.h> +#include <linux/task_io_accounting_ops.h> +#include "internal.h" + +/* + * [DEPRECATED] Mark page as requiring copy-to-cache using PG_private_2. The + * third mark in the folio queue is used to indicate that this folio needs + * writing. + */ +void netfs_pgpriv2_mark_copy_to_cache(struct netfs_io_subrequest *subreq, + struct netfs_io_request *rreq, + struct folio_queue *folioq, + int slot) +{ + struct folio *folio = folioq_folio(folioq, slot); + + trace_netfs_folio(folio, netfs_folio_trace_copy_to_cache); + folio_start_private_2(folio); + folioq_mark3(folioq, slot); +} + +/* + * [DEPRECATED] Cancel PG_private_2 on all marked folios in the event of an + * unrecoverable error. + */ +static void netfs_pgpriv2_cancel(struct folio_queue *folioq) +{ + struct folio *folio; + int slot; + + while (folioq) { + if (!folioq->marks3) { + folioq = folioq->next; + continue; + } + + slot = __ffs(folioq->marks3); + folio = folioq_folio(folioq, slot); + + trace_netfs_folio(folio, netfs_folio_trace_cancel_copy); + folio_end_private_2(folio); + folioq_unmark3(folioq, slot); + } +} + +/* + * [DEPRECATED] Copy a folio to the cache with PG_private_2 set. + */ +static int netfs_pgpriv2_copy_folio(struct netfs_io_request *wreq, struct folio *folio) +{ + struct netfs_io_stream *cache = &wreq->io_streams[1]; + size_t fsize = folio_size(folio), flen = fsize; + loff_t fpos = folio_pos(folio), i_size; + bool to_eof = false; + + _enter(""); + + /* netfs_perform_write() may shift i_size around the page or from out + * of the page to beyond it, but cannot move i_size into or through the + * page since we have it locked. + */ + i_size = i_size_read(wreq->inode); + + if (fpos >= i_size) { + /* mmap beyond eof. */ + _debug("beyond eof"); + folio_end_private_2(folio); + return 0; + } + + if (fpos + fsize > wreq->i_size) + wreq->i_size = i_size; + + if (flen > i_size - fpos) { + flen = i_size - fpos; + to_eof = true; + } else if (flen == i_size - fpos) { + to_eof = true; + } + + _debug("folio %zx %zx", flen, fsize); + + trace_netfs_folio(folio, netfs_folio_trace_store_copy); + + /* Attach the folio to the rolling buffer. */ + if (netfs_buffer_append_folio(wreq, folio, false) < 0) + return -ENOMEM; + + cache->submit_max_len = fsize; + cache->submit_off = 0; + cache->submit_len = flen; + + /* Attach the folio to one or more subrequests. For a big folio, we + * could end up with thousands of subrequests if the wsize is small - + * but we might need to wait during the creation of subrequests for + * network resources (eg. SMB credits). + */ + do { + ssize_t part; + + wreq->io_iter.iov_offset = cache->submit_off; + + atomic64_set(&wreq->issued_to, fpos + cache->submit_off); + part = netfs_advance_write(wreq, cache, fpos + cache->submit_off, + cache->submit_len, to_eof); + cache->submit_off += part; + cache->submit_max_len -= part; + if (part > cache->submit_len) + cache->submit_len = 0; + else + cache->submit_len -= part; + } while (cache->submit_len > 0); + + wreq->io_iter.iov_offset = 0; + iov_iter_advance(&wreq->io_iter, fsize); + atomic64_set(&wreq->issued_to, fpos + fsize); + + if (flen < fsize) + netfs_issue_write(wreq, cache); + + _leave(" = 0"); + return 0; +} + +/* + * [DEPRECATED] Go through the buffer and write any folios that are marked with + * the third mark to the cache. + */ +void netfs_pgpriv2_write_to_the_cache(struct netfs_io_request *rreq) +{ + struct netfs_io_request *wreq; + struct folio_queue *folioq; + struct folio *folio; + int error = 0; + int slot = 0; + + _enter(""); + + if (!fscache_resources_valid(&rreq->cache_resources)) + goto couldnt_start; + + /* Need the first folio to be able to set up the op. */ + for (folioq = rreq->buffer; folioq; folioq = folioq->next) { + if (folioq->marks3) { + slot = __ffs(folioq->marks3); + break; + } + } + if (!folioq) + return; + folio = folioq_folio(folioq, slot); + + wreq = netfs_create_write_req(rreq->mapping, NULL, folio_pos(folio), + NETFS_PGPRIV2_COPY_TO_CACHE); + if (IS_ERR(wreq)) { + kleave(" [create %ld]", PTR_ERR(wreq)); + goto couldnt_start; + } + + trace_netfs_write(wreq, netfs_write_trace_copy_to_cache); + netfs_stat(&netfs_n_wh_copy_to_cache); + + for (;;) { + error = netfs_pgpriv2_copy_folio(wreq, folio); + if (error < 0) + break; + + folioq_unmark3(folioq, slot); + if (!folioq->marks3) { + folioq = folioq->next; + if (!folioq) + break; + } + + slot = __ffs(folioq->marks3); + folio = folioq_folio(folioq, slot); + } + + netfs_issue_write(wreq, &wreq->io_streams[1]); + smp_wmb(); /* Write lists before ALL_QUEUED. */ + set_bit(NETFS_RREQ_ALL_QUEUED, &wreq->flags); + + netfs_put_request(wreq, false, netfs_rreq_trace_put_return); + _leave(" = %d", error); +couldnt_start: + netfs_pgpriv2_cancel(rreq->buffer); +} + +/* + * [DEPRECATED] Remove the PG_private_2 mark from any folios we've finished + * copying. + */ +bool netfs_pgpriv2_unlock_copied_folios(struct netfs_io_request *wreq) +{ + struct folio_queue *folioq = wreq->buffer; + unsigned long long collected_to = wreq->collected_to; + unsigned int slot = wreq->buffer_head_slot; + bool made_progress = false; + + if (slot >= folioq_nr_slots(folioq)) { + folioq = netfs_delete_buffer_head(wreq); + slot = 0; + } + + for (;;) { + struct folio *folio; + unsigned long long fpos, fend; + size_t fsize, flen; + + folio = folioq_folio(folioq, slot); + if (WARN_ONCE(!folio_test_private_2(folio), + "R=%08x: folio %lx is not marked private_2\n", + wreq->debug_id, folio->index)) + trace_netfs_folio(folio, netfs_folio_trace_not_under_wback); + + fpos = folio_pos(folio); + fsize = folio_size(folio); + flen = fsize; + + fend = min_t(unsigned long long, fpos + flen, wreq->i_size); + + trace_netfs_collect_folio(wreq, folio, fend, collected_to); + + /* Unlock any folio we've transferred all of. */ + if (collected_to < fend) + break; + + trace_netfs_folio(folio, netfs_folio_trace_end_copy); + folio_end_private_2(folio); + wreq->cleaned_to = fpos + fsize; + made_progress = true; + + /* Clean up the head folioq. If we clear an entire folioq, then + * we can get rid of it provided it's not also the tail folioq + * being filled by the issuer. + */ + folioq_clear(folioq, slot); + slot++; + if (slot >= folioq_nr_slots(folioq)) { + if (READ_ONCE(wreq->buffer_tail) == folioq) + break; + folioq = netfs_delete_buffer_head(wreq); + slot = 0; + } + + if (fpos + fsize >= collected_to) + break; + } + + wreq->buffer = folioq; + wreq->buffer_head_slot = slot; + return made_progress; +} diff --git a/fs/netfs/read_retry.c b/fs/netfs/read_retry.c new file mode 100644 index 000000000000..0350592ea804 --- /dev/null +++ b/fs/netfs/read_retry.c @@ -0,0 +1,256 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Network filesystem read subrequest retrying. + * + * Copyright (C) 2024 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include <linux/fs.h> +#include <linux/slab.h> +#include "internal.h" + +static void netfs_reissue_read(struct netfs_io_request *rreq, + struct netfs_io_subrequest *subreq) +{ + struct iov_iter *io_iter = &subreq->io_iter; + + if (iov_iter_is_folioq(io_iter)) { + subreq->curr_folioq = (struct folio_queue *)io_iter->folioq; + subreq->curr_folioq_slot = io_iter->folioq_slot; + subreq->curr_folio_order = subreq->curr_folioq->orders[subreq->curr_folioq_slot]; + } + + atomic_inc(&rreq->nr_outstanding); + __set_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags); + netfs_get_subrequest(subreq, netfs_sreq_trace_get_resubmit); + subreq->rreq->netfs_ops->issue_read(subreq); +} + +/* + * Go through the list of failed/short reads, retrying all retryable ones. We + * need to switch failed cache reads to network downloads. + */ +static void netfs_retry_read_subrequests(struct netfs_io_request *rreq) +{ + struct netfs_io_subrequest *subreq; + struct netfs_io_stream *stream0 = &rreq->io_streams[0]; + LIST_HEAD(sublist); + LIST_HEAD(queue); + + _enter("R=%x", rreq->debug_id); + + if (list_empty(&rreq->subrequests)) + return; + + if (rreq->netfs_ops->retry_request) + rreq->netfs_ops->retry_request(rreq, NULL); + + /* If there's no renegotiation to do, just resend each retryable subreq + * up to the first permanently failed one. + */ + if (!rreq->netfs_ops->prepare_read && + !test_bit(NETFS_RREQ_COPY_TO_CACHE, &rreq->flags)) { + 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)) { + netfs_reset_iter(subreq); + netfs_reissue_read(rreq, subreq); + } + } + return; + } + + /* Okay, we need to renegotiate all the download requests and flip any + * failed cache reads over to being download requests and negotiate + * those also. All fully successful subreqs have been removed from the + * list and any spare data from those has been donated. + * + * What we do is decant the list and rebuild it one subreq at a time so + * that we don't end up with donations jumping over a gap we're busy + * populating with smaller subrequests. In the event that the subreq + * we just launched finishes before we insert the next subreq, it'll + * fill in rreq->prev_donated instead. + + * Note: Alternatively, we could split the tail subrequest right before + * we reissue it and fix up the donations under lock. + */ + list_splice_init(&rreq->subrequests, &queue); + + do { + struct netfs_io_subrequest *from; + struct iov_iter source; + unsigned long long start, len; + size_t part, deferred_next_donated = 0; + bool boundary = false; + + /* Go through the subreqs and find the next span of contiguous + * buffer that we then rejig (cifs, for example, needs the + * rsize renegotiating) and reissue. + */ + from = list_first_entry(&queue, struct netfs_io_subrequest, rreq_link); + list_move_tail(&from->rreq_link, &sublist); + start = from->start + from->transferred; + len = from->len - from->transferred; + + _debug("from R=%08x[%x] s=%llx ctl=%zx/%zx/%zx", + rreq->debug_id, from->debug_index, + from->start, from->consumed, from->transferred, from->len); + + if (test_bit(NETFS_SREQ_FAILED, &from->flags) || + !test_bit(NETFS_SREQ_NEED_RETRY, &from->flags)) + goto abandon; + + deferred_next_donated = from->next_donated; + while ((subreq = list_first_entry_or_null( + &queue, struct netfs_io_subrequest, rreq_link))) { + if (subreq->start != start + len || + subreq->transferred > 0 || + !test_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags)) + break; + list_move_tail(&subreq->rreq_link, &sublist); + len += subreq->len; + deferred_next_donated = subreq->next_donated; + if (test_bit(NETFS_SREQ_BOUNDARY, &subreq->flags)) + break; + } + + _debug(" - range: %llx-%llx %llx", start, start + len - 1, len); + + /* Determine the set of buffers we're going to use. Each + * subreq gets a subset of a single overall contiguous buffer. + */ + netfs_reset_iter(from); + source = from->io_iter; + source.count = len; + + /* Work through the sublist. */ + while ((subreq = list_first_entry_or_null( + &sublist, struct netfs_io_subrequest, rreq_link))) { + list_del(&subreq->rreq_link); + + subreq->source = NETFS_DOWNLOAD_FROM_SERVER; + subreq->start = start - subreq->transferred; + subreq->len = len + subreq->transferred; + stream0->sreq_max_len = subreq->len; + + __clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); + __set_bit(NETFS_SREQ_RETRYING, &subreq->flags); + + spin_lock_bh(&rreq->lock); + list_add_tail(&subreq->rreq_link, &rreq->subrequests); + subreq->prev_donated += rreq->prev_donated; + rreq->prev_donated = 0; + trace_netfs_sreq(subreq, netfs_sreq_trace_retry); + spin_unlock_bh(&rreq->lock); + + BUG_ON(!len); + + /* Renegotiate max_len (rsize) */ + if (rreq->netfs_ops->prepare_read(subreq) < 0) { + trace_netfs_sreq(subreq, netfs_sreq_trace_reprep_failed); + __set_bit(NETFS_SREQ_FAILED, &subreq->flags); + } + + part = umin(len, stream0->sreq_max_len); + if (unlikely(rreq->io_streams[0].sreq_max_segs)) + part = netfs_limit_iter(&source, 0, part, stream0->sreq_max_segs); + subreq->len = subreq->transferred + part; + subreq->io_iter = source; + iov_iter_truncate(&subreq->io_iter, part); + iov_iter_advance(&source, part); + len -= part; + start += part; + if (!len) { + if (boundary) + __set_bit(NETFS_SREQ_BOUNDARY, &subreq->flags); + subreq->next_donated = deferred_next_donated; + } else { + __clear_bit(NETFS_SREQ_BOUNDARY, &subreq->flags); + subreq->next_donated = 0; + } + + netfs_reissue_read(rreq, subreq); + if (!len) + break; + + /* If we ran out of subrequests, allocate another. */ + if (list_empty(&sublist)) { + subreq = netfs_alloc_subrequest(rreq); + if (!subreq) + goto abandon; + subreq->source = NETFS_DOWNLOAD_FROM_SERVER; + subreq->start = start; + + /* We get two refs, but need just one. */ + netfs_put_subrequest(subreq, false, netfs_sreq_trace_new); + trace_netfs_sreq(subreq, netfs_sreq_trace_split); + list_add_tail(&subreq->rreq_link, &sublist); + } + } + + /* If we managed to use fewer subreqs, we can discard the + * excess. + */ + while ((subreq = list_first_entry_or_null( + &sublist, struct netfs_io_subrequest, rreq_link))) { + trace_netfs_sreq(subreq, netfs_sreq_trace_discard); + list_del(&subreq->rreq_link); + netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_done); + } + + } while (!list_empty(&queue)); + + return; + + /* If we hit ENOMEM, fail all remaining subrequests */ +abandon: + list_splice_init(&sublist, &queue); + list_for_each_entry(subreq, &queue, rreq_link) { + if (!subreq->error) + 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); + spin_unlock_bh(&rreq->lock); +} + +/* + * Retry reads. + */ +void netfs_retry_reads(struct netfs_io_request *rreq) +{ + trace_netfs_rreq(rreq, netfs_rreq_trace_resubmit); + + atomic_inc(&rreq->nr_outstanding); + + netfs_retry_read_subrequests(rreq); + + if (atomic_dec_and_test(&rreq->nr_outstanding)) + netfs_rreq_terminated(rreq, false); +} + +/* + * Unlock any the pages that haven't been unlocked yet due to abandoned + * subrequests. + */ +void netfs_unlock_abandoned_read_pages(struct netfs_io_request *rreq) +{ + struct folio_queue *p; + + for (p = rreq->buffer; p; p = p->next) { + for (int slot = 0; slot < folioq_count(p); slot++) { + struct folio *folio = folioq_folio(p, slot); + + if (folio && !folioq_is_marked2(p, slot)) { + trace_netfs_folio(folio, netfs_folio_trace_abandon); + folio_unlock(folio); + } + } + } +} diff --git a/fs/netfs/stats.c b/fs/netfs/stats.c index 5065289f5555..8e63516b40f6 100644 --- a/fs/netfs/stats.c +++ b/fs/netfs/stats.c @@ -32,6 +32,7 @@ atomic_t netfs_n_wh_buffered_write; atomic_t netfs_n_wh_writethrough; atomic_t netfs_n_wh_dio_write; atomic_t netfs_n_wh_writepages; +atomic_t netfs_n_wh_copy_to_cache; atomic_t netfs_n_wh_wstream_conflict; atomic_t netfs_n_wh_upload; atomic_t netfs_n_wh_upload_done; @@ -51,11 +52,12 @@ int netfs_stats_show(struct seq_file *m, void *v) atomic_read(&netfs_n_rh_read_folio), atomic_read(&netfs_n_rh_write_begin), atomic_read(&netfs_n_rh_write_zskip)); - seq_printf(m, "Writes : BW=%u WT=%u DW=%u WP=%u\n", + seq_printf(m, "Writes : BW=%u WT=%u DW=%u WP=%u 2C=%u\n", atomic_read(&netfs_n_wh_buffered_write), atomic_read(&netfs_n_wh_writethrough), atomic_read(&netfs_n_wh_dio_write), - atomic_read(&netfs_n_wh_writepages)); + atomic_read(&netfs_n_wh_writepages), + atomic_read(&netfs_n_wh_copy_to_cache)); seq_printf(m, "ZeroOps: ZR=%u sh=%u sk=%u\n", atomic_read(&netfs_n_rh_zero), atomic_read(&netfs_n_rh_short_read), diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c index 4280dc6ec035..1d438be2e1b4 100644 --- a/fs/netfs/write_collect.c +++ b/fs/netfs/write_collect.c @@ -87,6 +87,12 @@ static void netfs_writeback_unlock_folios(struct netfs_io_request *wreq, unsigned long long collected_to = wreq->collected_to; unsigned int slot = wreq->buffer_head_slot; + if (wreq->origin == NETFS_PGPRIV2_COPY_TO_CACHE) { + if (netfs_pgpriv2_unlock_copied_folios(wreq)) + *notes |= MADE_PROGRESS; + return; + } + if (slot >= folioq_nr_slots(folioq)) { folioq = netfs_delete_buffer_head(wreq); slot = 0; @@ -383,7 +389,8 @@ reassess_streams: smp_rmb(); collected_to = ULLONG_MAX; if (wreq->origin == NETFS_WRITEBACK || - wreq->origin == NETFS_WRITETHROUGH) + wreq->origin == NETFS_WRITETHROUGH || + wreq->origin == NETFS_PGPRIV2_COPY_TO_CACHE) notes = BUFFERED; else notes = 0; diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c index 25fb7e166cc0..975436d3dc3f 100644 --- a/fs/netfs/write_issue.c +++ b/fs/netfs/write_issue.c @@ -95,7 +95,8 @@ struct netfs_io_request *netfs_create_write_req(struct address_space *mapping, struct netfs_io_request *wreq; struct netfs_inode *ictx; bool is_buffered = (origin == NETFS_WRITEBACK || - origin == NETFS_WRITETHROUGH); + origin == NETFS_WRITETHROUGH || + origin == NETFS_PGPRIV2_COPY_TO_CACHE); wreq = netfs_alloc_request(mapping, file, start, 0, origin); if (IS_ERR(wreq)) @@ -161,10 +162,6 @@ static void netfs_prepare_write(struct netfs_io_request *wreq, _enter("R=%x[%x]", wreq->debug_id, subreq->debug_index); - trace_netfs_sreq_ref(wreq->debug_id, subreq->debug_index, - refcount_read(&subreq->ref), - netfs_sreq_trace_new); - trace_netfs_sreq(subreq, netfs_sreq_trace_prepare); stream->sreq_max_len = UINT_MAX; @@ -241,8 +238,8 @@ void netfs_reissue_write(struct netfs_io_stream *stream, netfs_do_issue_write(stream, subreq); } -static void netfs_issue_write(struct netfs_io_request *wreq, - struct netfs_io_stream *stream) +void netfs_issue_write(struct netfs_io_request *wreq, + struct netfs_io_stream *stream) { struct netfs_io_subrequest *subreq = stream->construct; @@ -259,9 +256,9 @@ static void netfs_issue_write(struct netfs_io_request *wreq, * we can avoid overrunning the credits obtained (cifs) and try to parallelise * content-crypto preparation with network writes. */ -static int netfs_advance_write(struct netfs_io_request *wreq, - struct netfs_io_stream *stream, - loff_t start, size_t len, bool to_eof) +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_subrequest *subreq = stream->construct; size_t part; diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c index 7a558dea75c4..810269ee0a50 100644 --- a/fs/nfs/fscache.c +++ b/fs/nfs/fscache.c @@ -267,6 +267,7 @@ static int nfs_netfs_init_request(struct netfs_io_request *rreq, struct file *fi rreq->debug_id = atomic_inc_return(&nfs_netfs_debug_id); /* [DEPRECATED] Use PG_private_2 to mark folio being written to the cache. */ __set_bit(NETFS_RREQ_USE_PGPRIV2, &rreq->flags); + rreq->io_streams[0].sreq_max_len = NFS_SB(rreq->inode->i_sb)->rsize; return 0; } @@ -288,14 +289,6 @@ static struct nfs_netfs_io_data *nfs_netfs_alloc(struct netfs_io_subrequest *sre return netfs; } -static bool nfs_netfs_clamp_length(struct netfs_io_subrequest *sreq) -{ - size_t rsize = NFS_SB(sreq->rreq->inode->i_sb)->rsize; - - sreq->len = min(sreq->len, rsize); - return true; -} - static void nfs_netfs_issue_read(struct netfs_io_subrequest *sreq) { struct nfs_netfs_io_data *netfs; @@ -304,17 +297,18 @@ static void nfs_netfs_issue_read(struct netfs_io_subrequest *sreq) struct nfs_open_context *ctx = sreq->rreq->netfs_priv; struct page *page; unsigned long idx; + pgoff_t start, last; int err; - pgoff_t start = (sreq->start + sreq->transferred) >> PAGE_SHIFT; - pgoff_t last = ((sreq->start + sreq->len - - sreq->transferred - 1) >> PAGE_SHIFT); + + start = (sreq->start + sreq->transferred) >> PAGE_SHIFT; + last = ((sreq->start + sreq->len - sreq->transferred - 1) >> PAGE_SHIFT); nfs_pageio_init_read(&pgio, inode, false, &nfs_async_read_completion_ops); netfs = nfs_netfs_alloc(sreq); if (!netfs) - return netfs_subreq_terminated(sreq, -ENOMEM, false); + return netfs_read_subreq_terminated(sreq, -ENOMEM, false); pgio.pg_netfs = netfs; /* used in completion */ @@ -380,5 +374,4 @@ const struct netfs_request_ops nfs_netfs_ops = { .init_request = nfs_netfs_init_request, .free_request = nfs_netfs_free_request, .issue_read = nfs_netfs_issue_read, - .clamp_length = nfs_netfs_clamp_length }; diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h index e8adae1bc260..772d485e96d3 100644 --- a/fs/nfs/fscache.h +++ b/fs/nfs/fscache.h @@ -60,8 +60,6 @@ static inline void nfs_netfs_get(struct nfs_netfs_io_data *netfs) static inline void nfs_netfs_put(struct nfs_netfs_io_data *netfs) { - ssize_t final_len; - /* Only the last RPC completion should call netfs_subreq_terminated() */ if (!refcount_dec_and_test(&netfs->refcount)) return; @@ -74,8 +72,9 @@ static inline void nfs_netfs_put(struct nfs_netfs_io_data *netfs) * Correct the final length here to be no larger than the netfs subrequest * length, and thus avoid netfs's "Subreq overread" warning message. */ - final_len = min_t(s64, netfs->sreq->len, atomic64_read(&netfs->transferred)); - netfs_subreq_terminated(netfs->sreq, netfs->error ?: final_len, false); + netfs->sreq->transferred = min_t(s64, netfs->sreq->len, + atomic64_read(&netfs->transferred)); + netfs_read_subreq_terminated(netfs->sreq, netfs->error, false); kfree(netfs); } static inline void nfs_netfs_inode_init(struct nfs_inode *nfsi) diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index bfbcf310807f..9457c298dc39 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -1485,7 +1485,6 @@ struct cifs_io_subrequest { struct cifs_io_request *req; }; ssize_t got_bytes; - size_t actual_len; unsigned int xid; int result; bool have_xid; diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c index 6dce70f17208..04f2a5441a89 100644 --- a/fs/smb/client/cifssmb.c +++ b/fs/smb/client/cifssmb.c @@ -1309,10 +1309,8 @@ cifs_readv_callback(struct mid_q_entry *mid) if (rdata->result == 0 || rdata->result == -EAGAIN) iov_iter_advance(&rdata->subreq.io_iter, rdata->got_bytes); rdata->credits.value = 0; - netfs_subreq_terminated(&rdata->subreq, - (rdata->result == 0 || rdata->result == -EAGAIN) ? - rdata->got_bytes : rdata->result, - false); + rdata->subreq.transferred += rdata->got_bytes; + netfs_read_subreq_terminated(&rdata->subreq, rdata->result, false); release_mid(mid); add_credits(server, &credits, 0); } diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index ceef7048cad2..bcde3f9c89e0 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -112,7 +112,6 @@ static void cifs_issue_write(struct netfs_io_subrequest *subreq) goto fail; } - wdata->actual_len = wdata->subreq.len; rc = adjust_credits(wdata->server, wdata, cifs_trace_rw_credits_issue_write_adjust); if (rc) goto fail; @@ -141,25 +140,22 @@ static void cifs_netfs_invalidate_cache(struct netfs_io_request *wreq) } /* - * Split the read up according to how many credits we can get for each piece. - * It's okay to sleep here if we need to wait for more credit to become - * available. - * - * We also choose the server and allocate an operation ID to be cleaned up - * later. + * Negotiate the size of a read operation on behalf of the netfs library. */ -static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) +static int cifs_prepare_read(struct netfs_io_subrequest *subreq) { struct netfs_io_request *rreq = subreq->rreq; - struct netfs_io_stream *stream = &rreq->io_streams[subreq->stream_nr]; struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq); struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); struct TCP_Server_Info *server = req->server; struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); - int rc; + size_t size; + int rc = 0; - rdata->xid = get_xid(); - rdata->have_xid = true; + if (!rdata->have_xid) { + rdata->xid = get_xid(); + rdata->have_xid = true; + } rdata->server = server; if (cifs_sb->ctx->rsize == 0) @@ -167,13 +163,12 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) server->ops->negotiate_rsize(tlink_tcon(req->cfile->tlink), cifs_sb->ctx); - rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, - &stream->sreq_max_len, &rdata->credits); - if (rc) { - subreq->error = rc; - return false; - } + &size, &rdata->credits); + if (rc) + return rc; + + rreq->io_streams[0].sreq_max_len = size; rdata->credits.in_flight_check = 1; rdata->credits.rreq_debug_id = rreq->debug_id; @@ -185,14 +180,11 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) server->credits, server->in_flight, 0, cifs_trace_rw_credits_read_submit); - subreq->len = umin(subreq->len, stream->sreq_max_len); - rdata->actual_len = subreq->len; - #ifdef CONFIG_CIFS_SMB_DIRECT if (server->smbd_conn) - stream->sreq_max_segs = server->smbd_conn->max_frmr_depth; + rreq->io_streams[0].sreq_max_segs = server->smbd_conn->max_frmr_depth; #endif - return true; + return 0; } /* @@ -201,59 +193,41 @@ static bool cifs_clamp_length(struct netfs_io_subrequest *subreq) * to only read a portion of that, but as long as we read something, the netfs * helper will call us again so that we can issue another read. */ -static void cifs_req_issue_read(struct netfs_io_subrequest *subreq) +static void cifs_issue_read(struct netfs_io_subrequest *subreq) { struct netfs_io_request *rreq = subreq->rreq; struct cifs_io_subrequest *rdata = container_of(subreq, struct cifs_io_subrequest, subreq); struct cifs_io_request *req = container_of(subreq->rreq, struct cifs_io_request, rreq); struct TCP_Server_Info *server = req->server; - struct cifs_sb_info *cifs_sb = CIFS_SB(rreq->inode->i_sb); int rc = 0; cifs_dbg(FYI, "%s: op=%08x[%x] mapping=%p len=%zu/%zu\n", __func__, rreq->debug_id, subreq->debug_index, rreq->mapping, subreq->transferred, subreq->len); - if (test_bit(NETFS_SREQ_RETRYING, &subreq->flags)) { - /* - * As we're issuing a retry, we need to negotiate some new - * credits otherwise the server may reject the op with - * INVALID_PARAMETER. Note, however, we may get back less - * credit than we need to complete the op, in which case, we - * shorten the op and rely on additional rounds of retry. - */ - size_t rsize = umin(subreq->len - subreq->transferred, - cifs_sb->ctx->rsize); - - rc = server->ops->wait_mtu_credits(server, rsize, &rdata->actual_len, - &rdata->credits); - if (rc) - goto out; - - rdata->credits.in_flight_check = 1; - - trace_smb3_rw_credits(rdata->rreq->debug_id, - rdata->subreq.debug_index, - rdata->credits.value, - server->credits, server->in_flight, 0, - cifs_trace_rw_credits_read_resubmit); - } + rc = adjust_credits(server, rdata, cifs_trace_rw_credits_issue_read_adjust); + if (rc) + goto failed; if (req->cfile->invalidHandle) { do { rc = cifs_reopen_file(req->cfile, true); } while (rc == -EAGAIN); if (rc) - goto out; + goto failed; } if (subreq->rreq->origin != NETFS_DIO_READ) __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); + trace_netfs_sreq(subreq, netfs_sreq_trace_submit); rc = rdata->server->ops->async_readv(rdata); -out: if (rc) - netfs_subreq_terminated(subreq, rc, false); + goto failed; + return; + +failed: + netfs_read_subreq_terminated(subreq, rc, false); } /* @@ -364,8 +338,8 @@ const struct netfs_request_ops cifs_req_ops = { .init_request = cifs_init_request, .free_request = cifs_free_request, .free_subrequest = cifs_free_subrequest, - .clamp_length = cifs_clamp_length, - .issue_read = cifs_req_issue_read, + .prepare_read = cifs_prepare_read, + .issue_read = cifs_issue_read, .done = cifs_rreq_done, .begin_writeback = cifs_begin_writeback, .prepare_write = cifs_prepare_write, diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 4df84ebe8dbe..85f2878454f3 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -301,7 +301,8 @@ smb2_adjust_credits(struct TCP_Server_Info *server, unsigned int /*enum smb3_rw_credits_trace*/ trace) { struct cifs_credits *credits = &subreq->credits; - int new_val = DIV_ROUND_UP(subreq->actual_len, SMB2_MAX_BUFFER_SIZE); + int new_val = DIV_ROUND_UP(subreq->subreq.len - subreq->subreq.transferred, + SMB2_MAX_BUFFER_SIZE); int scredits, in_flight; if (!credits->value || credits->value == new_val) diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index 88dc49d67037..95377bb91950 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -4498,9 +4498,7 @@ static void smb2_readv_worker(struct work_struct *work) struct cifs_io_subrequest *rdata = container_of(work, struct cifs_io_subrequest, subreq.work); - netfs_subreq_terminated(&rdata->subreq, - (rdata->result == 0 || rdata->result == -EAGAIN) ? - rdata->got_bytes : rdata->result, true); + netfs_read_subreq_terminated(&rdata->subreq, rdata->result, false); } static void @@ -4532,7 +4530,7 @@ smb2_readv_callback(struct mid_q_entry *mid) cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n", __func__, mid->mid, mid->mid_state, rdata->result, - rdata->actual_len, rdata->subreq.len - rdata->subreq.transferred); + rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred); switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: @@ -4554,6 +4552,7 @@ smb2_readv_callback(struct mid_q_entry *mid) break; case MID_REQUEST_SUBMITTED: case MID_RETRY_NEEDED: + __set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags); rdata->result = -EAGAIN; if (server->sign && rdata->got_bytes) /* reset bytes number since we can not check a sign */ @@ -4588,7 +4587,7 @@ smb2_readv_callback(struct mid_q_entry *mid) rdata->req->cfile->fid.persistent_fid, tcon->tid, tcon->ses->Suid, rdata->subreq.start + rdata->subreq.transferred, - rdata->actual_len, + rdata->subreq.len - rdata->subreq.transferred, rdata->result); } else trace_smb3_read_done(rdata->rreq->debug_id, @@ -4603,9 +4602,9 @@ smb2_readv_callback(struct mid_q_entry *mid) __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags); rdata->result = 0; } else { - if (rdata->got_bytes < rdata->actual_len && - rdata->subreq.start + rdata->subreq.transferred + rdata->got_bytes == - ictx->remote_i_size) { + 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; } @@ -4614,6 +4613,10 @@ smb2_readv_callback(struct mid_q_entry *mid) server->credits, server->in_flight, 0, cifs_trace_rw_credits_read_response_clear); rdata->credits.value = 0; + rdata->subreq.transferred += rdata->got_bytes; + if (rdata->subreq.start + rdata->subreq.transferred >= rdata->subreq.rreq->i_size) + __set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags); + trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress); INIT_WORK(&rdata->subreq.work, smb2_readv_worker); queue_work(cifsiod_wq, &rdata->subreq.work); release_mid(mid); @@ -4648,7 +4651,7 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink); io_parms.server = server = rdata->server; io_parms.offset = subreq->start + subreq->transferred; - io_parms.length = rdata->actual_len; + io_parms.length = subreq->len - subreq->transferred; io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid; io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid; io_parms.pid = rdata->req->pid; @@ -4669,7 +4672,7 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) shdr = (struct smb2_hdr *)buf; if (rdata->credits.value > 0) { - shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->actual_len, + shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length, SMB2_MAX_BUFFER_SIZE)); credit_request = le16_to_cpu(shdr->CreditCharge) + 8; if (server->credits >= server->max_credits) @@ -4697,7 +4700,8 @@ smb2_async_readv(struct cifs_io_subrequest *rdata) rdata->xid, io_parms.persistent_fid, io_parms.tcon->tid, io_parms.tcon->ses->Suid, - io_parms.offset, rdata->actual_len, rc); + io_parms.offset, + subreq->len - subreq->transferred, rc); } async_readv_out: @@ -4880,6 +4884,7 @@ smb2_writev_callback(struct mid_q_entry *mid) server->credits, server->in_flight, 0, cifs_trace_rw_credits_write_response_clear); wdata->credits.value = 0; + trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress); cifs_write_subrequest_terminated(wdata, result ?: written, true); release_mid(mid); trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0, diff --git a/include/linux/folio_queue.h b/include/linux/folio_queue.h index 52773613bf23..955680c3bb5f 100644 --- a/include/linux/folio_queue.h +++ b/include/linux/folio_queue.h @@ -27,6 +27,7 @@ struct folio_queue { struct folio_queue *prev; /* Previous queue segment of NULL */ unsigned long marks; /* 1-bit mark per folio */ unsigned long marks2; /* Second 1-bit mark per folio */ + unsigned long marks3; /* Third 1-bit mark per folio */ #if PAGEVEC_SIZE > BITS_PER_LONG #error marks is not big enough #endif @@ -39,6 +40,7 @@ static inline void folioq_init(struct folio_queue *folioq) folioq->prev = NULL; folioq->marks = 0; folioq->marks2 = 0; + folioq->marks3 = 0; } static inline unsigned int folioq_nr_slots(const struct folio_queue *folioq) @@ -87,6 +89,21 @@ static inline void folioq_unmark2(struct folio_queue *folioq, unsigned int slot) clear_bit(slot, &folioq->marks2); } +static inline bool folioq_is_marked3(const struct folio_queue *folioq, unsigned int slot) +{ + return test_bit(slot, &folioq->marks3); +} + +static inline void folioq_mark3(struct folio_queue *folioq, unsigned int slot) +{ + set_bit(slot, &folioq->marks3); +} + +static inline void folioq_unmark3(struct folio_queue *folioq, unsigned int slot) +{ + clear_bit(slot, &folioq->marks3); +} + static inline unsigned int __folio_order(struct folio *folio) { if (!folio_test_large(folio)) @@ -133,6 +150,7 @@ static inline void folioq_clear(struct folio_queue *folioq, unsigned int slot) folioq->vec.folios[slot] = NULL; folioq_unmark(folioq, slot); folioq_unmark2(folioq, slot); + folioq_unmark3(folioq, slot); } #endif /* _LINUX_FOLIO_QUEUE_H */ diff --git a/include/linux/netfs.h b/include/linux/netfs.h index bd0e3d147822..c0f0c9c87d86 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -178,36 +178,43 @@ struct netfs_io_subrequest { unsigned long long start; /* Where to start the I/O */ size_t len; /* Size of the I/O */ size_t transferred; /* Amount of data transferred */ + size_t consumed; /* Amount of read data consumed */ + size_t prev_donated; /* Amount of data donated from previous subreq */ + size_t next_donated; /* Amount of data donated from next subreq */ refcount_t ref; 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 */ 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 */ + unsigned char curr_folio_order; /* Order of folio */ + struct folio_queue *curr_folioq; /* Queue segment in which current folio resides */ unsigned long flags; #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_SHORT_IO 2 /* Set if the I/O was short */ #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_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 11 /* Set if the subreq failed unretryably */ -#define NETFS_SREQ_HIT_EOF 12 /* Set if we hit the EOF */ }; enum netfs_io_origin { NETFS_READAHEAD, /* This read was triggered by readahead */ NETFS_READPAGE, /* This read is a synchronous read */ + NETFS_READ_GAPS, /* This read is a synchronous read to fill gaps */ NETFS_READ_FOR_WRITE, /* This read is to prepare a write */ NETFS_DIO_READ, /* This is a direct I/O read */ NETFS_WRITEBACK, /* This write was triggered by writepages */ NETFS_WRITETHROUGH, /* This write was made by netfs_perform_write() */ NETFS_UNBUFFERED_WRITE, /* This is an unbuffered write */ NETFS_DIO_WRITE, /* This is a direct I/O write */ + NETFS_PGPRIV2_COPY_TO_CACHE, /* [DEPRECATED] This is writing read data to the cache */ nr__netfs_io_origin } __mode(byte); @@ -224,6 +231,7 @@ struct netfs_io_request { struct address_space *mapping; /* The mapping being accessed */ struct kiocb *iocb; /* AIO completion vector */ struct netfs_cache_resources cache_resources; + struct readahead_control *ractl; /* Readahead descriptor */ struct list_head proc_link; /* Link in netfs_iorequests */ struct list_head subrequests; /* Contributory I/O operations */ struct netfs_io_stream io_streams[2]; /* Streams of parallel I/O operations */ @@ -244,12 +252,10 @@ struct netfs_io_request { unsigned int nr_group_rel; /* Number of refs to release on ->group */ spinlock_t lock; /* Lock for queuing subreqs */ atomic_t nr_outstanding; /* Number of ops in progress */ - atomic_t nr_copy_ops; /* Number of copy-to-cache ops in progress */ - size_t upper_len; /* Length can be extended to here */ unsigned long long submitted; /* Amount submitted for I/O so far */ unsigned long long len; /* Length of the request */ size_t transferred; /* Amount to be indicated as transferred */ - short error; /* 0 or error that occurred */ + long error; /* 0 or error that occurred */ enum netfs_io_origin origin; /* Origin of the request */ bool direct_bv_unpin; /* T if direct_bv[] must be unpinned */ u8 buffer_head_slot; /* First slot in ->buffer */ @@ -260,9 +266,9 @@ struct netfs_io_request { unsigned long long collected_to; /* Point we've collected to */ unsigned long long cleaned_to; /* Position we've cleaned folios to */ pgoff_t no_unlock_folio; /* Don't unlock this folio after read */ + size_t prev_donated; /* Fallback for subreq->prev_donated */ refcount_t ref; unsigned long flags; -#define NETFS_RREQ_INCOMPLETE_IO 0 /* Some ioreqs terminated short or with error */ #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 */ @@ -274,6 +280,7 @@ struct netfs_io_request { #define NETFS_RREQ_PAUSE 11 /* Pause subrequest generation */ #define NETFS_RREQ_USE_IO_ITER 12 /* Use ->io_iter rather than ->i_pages */ #define NETFS_RREQ_ALL_QUEUED 13 /* All subreqs are now queued */ +#define NETFS_RREQ_NEED_RETRY 14 /* Need to try retrying */ #define NETFS_RREQ_USE_PGPRIV2 31 /* [DEPRECATED] Use PG_private_2 to mark * write to cache on read */ const struct netfs_request_ops *netfs_ops; @@ -292,7 +299,7 @@ struct netfs_request_ops { /* Read request handling */ void (*expand_readahead)(struct netfs_io_request *rreq); - bool (*clamp_length)(struct netfs_io_subrequest *subreq); + int (*prepare_read)(struct netfs_io_subrequest *subreq); void (*issue_read)(struct netfs_io_subrequest *subreq); bool (*is_still_valid)(struct netfs_io_request *rreq); int (*check_write_begin)(struct file *file, loff_t pos, unsigned len, @@ -422,7 +429,10 @@ bool netfs_release_folio(struct folio *folio, gfp_t gfp); vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_group); /* (Sub)request management API. */ -void netfs_subreq_terminated(struct netfs_io_subrequest *, ssize_t, bool); +void netfs_read_subreq_progress(struct netfs_io_subrequest *subreq, + bool was_async); +void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq, + int error, bool was_async); void netfs_get_subrequest(struct netfs_io_subrequest *subreq, enum netfs_sreq_ref_trace what); void netfs_put_subrequest(struct netfs_io_subrequest *subreq, diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h index 58bf23002fc1..7b26463cb98f 100644 --- a/include/trace/events/netfs.h +++ b/include/trace/events/netfs.h @@ -20,6 +20,7 @@ EM(netfs_read_trace_expanded, "EXPANDED ") \ EM(netfs_read_trace_readahead, "READAHEAD") \ EM(netfs_read_trace_readpage, "READPAGE ") \ + EM(netfs_read_trace_read_gaps, "READ-GAPS") \ EM(netfs_read_trace_prefetch_for_write, "PREFETCHW") \ E_(netfs_read_trace_write_begin, "WRITEBEGN") @@ -33,12 +34,14 @@ #define netfs_rreq_origins \ EM(NETFS_READAHEAD, "RA") \ EM(NETFS_READPAGE, "RP") \ + EM(NETFS_READ_GAPS, "RG") \ EM(NETFS_READ_FOR_WRITE, "RW") \ EM(NETFS_DIO_READ, "DR") \ EM(NETFS_WRITEBACK, "WB") \ EM(NETFS_WRITETHROUGH, "WT") \ EM(NETFS_UNBUFFERED_WRITE, "UW") \ - E_(NETFS_DIO_WRITE, "DW") + EM(NETFS_DIO_WRITE, "DW") \ + E_(NETFS_PGPRIV2_COPY_TO_CACHE, "2C") #define netfs_rreq_traces \ EM(netfs_rreq_trace_assess, "ASSESS ") \ @@ -69,15 +72,25 @@ E_(NETFS_INVALID_WRITE, "INVL") #define netfs_sreq_traces \ + EM(netfs_sreq_trace_add_donations, "+DON ") \ + EM(netfs_sreq_trace_added, "ADD ") \ + EM(netfs_sreq_trace_clear, "CLEAR") \ EM(netfs_sreq_trace_discard, "DSCRD") \ + EM(netfs_sreq_trace_donate_to_prev, "DON-P") \ + EM(netfs_sreq_trace_donate_to_next, "DON-N") \ EM(netfs_sreq_trace_download_instead, "RDOWN") \ EM(netfs_sreq_trace_fail, "FAIL ") \ EM(netfs_sreq_trace_free, "FREE ") \ + EM(netfs_sreq_trace_hit_eof, "EOF ") \ + EM(netfs_sreq_trace_io_progress, "IO ") \ EM(netfs_sreq_trace_limited, "LIMIT") \ EM(netfs_sreq_trace_prepare, "PREP ") \ EM(netfs_sreq_trace_prep_failed, "PRPFL") \ - EM(netfs_sreq_trace_resubmit_short, "SHORT") \ + EM(netfs_sreq_trace_progress, "PRGRS") \ + EM(netfs_sreq_trace_reprep_failed, "REPFL") \ EM(netfs_sreq_trace_retry, "RETRY") \ + EM(netfs_sreq_trace_short, "SHORT") \ + EM(netfs_sreq_trace_split, "SPLIT") \ EM(netfs_sreq_trace_submit, "SUBMT") \ EM(netfs_sreq_trace_terminated, "TERM ") \ EM(netfs_sreq_trace_write, "WRITE") \ @@ -118,7 +131,7 @@ EM(netfs_sreq_trace_new, "NEW ") \ EM(netfs_sreq_trace_put_cancel, "PUT CANCEL ") \ EM(netfs_sreq_trace_put_clear, "PUT CLEAR ") \ - EM(netfs_sreq_trace_put_discard, "PUT DISCARD") \ + EM(netfs_sreq_trace_put_consumed, "PUT CONSUME") \ EM(netfs_sreq_trace_put_done, "PUT DONE ") \ EM(netfs_sreq_trace_put_failed, "PUT FAILED ") \ EM(netfs_sreq_trace_put_merged, "PUT MERGED ") \ @@ -138,6 +151,7 @@ EM(netfs_flush_content, "flush") \ EM(netfs_streaming_filled_page, "mod-streamw-f") \ EM(netfs_streaming_cont_filled_page, "mod-streamw-f+") \ + EM(netfs_folio_trace_abandon, "abandon") \ EM(netfs_folio_trace_cancel_copy, "cancel-copy") \ EM(netfs_folio_trace_clear, "clear") \ EM(netfs_folio_trace_clear_cc, "clear-cc") \ @@ -154,7 +168,11 @@ EM(netfs_folio_trace_mkwrite_plus, "mkwrite+") \ EM(netfs_folio_trace_not_under_wback, "!wback") \ EM(netfs_folio_trace_put, "put") \ + EM(netfs_folio_trace_read, "read") \ + EM(netfs_folio_trace_read_done, "read-done") \ EM(netfs_folio_trace_read_gaps, "read-gaps") \ + EM(netfs_folio_trace_read_put, "read-put") \ + EM(netfs_folio_trace_read_unlock, "read-unlock") \ EM(netfs_folio_trace_redirtied, "redirtied") \ EM(netfs_folio_trace_store, "store") \ EM(netfs_folio_trace_store_copy, "store-copy") \ @@ -167,6 +185,12 @@ EM(netfs_contig_trace_jump, "-->JUMP-->") \ E_(netfs_contig_trace_unlock, "Unlock") +#define netfs_donate_traces \ + EM(netfs_trace_donate_tail_to_prev, "tail-to-prev") \ + EM(netfs_trace_donate_to_prev, "to-prev") \ + EM(netfs_trace_donate_to_next, "to-next") \ + E_(netfs_trace_donate_to_deferred_next, "defer-next") + #ifndef __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY #define __NETFS_DECLARE_TRACE_ENUMS_ONCE_ONLY @@ -184,6 +208,7 @@ enum netfs_rreq_ref_trace { netfs_rreq_ref_traces } __mode(byte); enum netfs_sreq_ref_trace { netfs_sreq_ref_traces } __mode(byte); enum netfs_folio_trace { netfs_folio_traces } __mode(byte); enum netfs_collect_contig_trace { netfs_collect_contig_traces } __mode(byte); +enum netfs_donate_trace { netfs_donate_traces } __mode(byte); #endif @@ -206,6 +231,7 @@ netfs_rreq_ref_traces; netfs_sreq_ref_traces; netfs_folio_traces; netfs_collect_contig_traces; +netfs_donate_traces; /* * Now redefine the EM() and E_() macros to map the enums to the strings that @@ -226,6 +252,7 @@ TRACE_EVENT(netfs_read, TP_STRUCT__entry( __field(unsigned int, rreq ) __field(unsigned int, cookie ) + __field(loff_t, i_size ) __field(loff_t, start ) __field(size_t, len ) __field(enum netfs_read_trace, what ) @@ -235,18 +262,19 @@ TRACE_EVENT(netfs_read, TP_fast_assign( __entry->rreq = rreq->debug_id; __entry->cookie = rreq->cache_resources.debug_id; + __entry->i_size = rreq->i_size; __entry->start = start; __entry->len = len; __entry->what = what; __entry->netfs_inode = rreq->inode->i_ino; ), - TP_printk("R=%08x %s c=%08x ni=%x s=%llx %zx", + TP_printk("R=%08x %s c=%08x ni=%x s=%llx l=%zx sz=%llx", __entry->rreq, __print_symbolic(__entry->what, netfs_read_traces), __entry->cookie, __entry->netfs_inode, - __entry->start, __entry->len) + __entry->start, __entry->len, __entry->i_size) ); TRACE_EVENT(netfs_rreq, @@ -651,6 +679,71 @@ TRACE_EVENT(netfs_collect_stream, __entry->collected_to, __entry->front) ); +TRACE_EVENT(netfs_progress, + TP_PROTO(const struct netfs_io_subrequest *subreq, + unsigned long long start, size_t avail, size_t part), + + TP_ARGS(subreq, start, avail, part), + + TP_STRUCT__entry( + __field(unsigned int, rreq) + __field(unsigned int, subreq) + __field(unsigned int, consumed) + __field(unsigned int, transferred) + __field(unsigned long long, f_start) + __field(unsigned int, f_avail) + __field(unsigned int, f_part) + __field(unsigned char, slot) + ), + + TP_fast_assign( + __entry->rreq = subreq->rreq->debug_id; + __entry->subreq = subreq->debug_index; + __entry->consumed = subreq->consumed; + __entry->transferred = subreq->transferred; + __entry->f_start = start; + __entry->f_avail = avail; + __entry->f_part = part; + __entry->slot = subreq->curr_folioq_slot; + ), + + TP_printk("R=%08x[%02x] s=%llx ct=%x/%x pa=%x/%x sl=%x", + __entry->rreq, __entry->subreq, __entry->f_start, + __entry->consumed, __entry->transferred, + __entry->f_part, __entry->f_avail, __entry->slot) + ); + +TRACE_EVENT(netfs_donate, + TP_PROTO(const struct netfs_io_request *rreq, + const struct netfs_io_subrequest *from, + const struct netfs_io_subrequest *to, + size_t amount, + enum netfs_donate_trace trace), + + TP_ARGS(rreq, from, to, amount, trace), + + TP_STRUCT__entry( + __field(unsigned int, rreq) + __field(unsigned int, from) + __field(unsigned int, to) + __field(unsigned int, amount) + __field(enum netfs_donate_trace, trace) + ), + + TP_fast_assign( + __entry->rreq = rreq->debug_id; + __entry->from = from->debug_index; + __entry->to = to ? to->debug_index : -1; + __entry->amount = amount; + __entry->trace = trace; + ), + + TP_printk("R=%08x[%02x] -> [%02x] %s am=%x", + __entry->rreq, __entry->from, __entry->to, + __print_symbolic(__entry->trace, netfs_donate_traces), + __entry->amount) + ); + #undef EM #undef E_ #endif /* _TRACE_NETFS_H */ |