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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 2/5] netfs: Call trace_netfs_read() after ->begin_cache_operation() From: David Howells To: jlayton@kernel.org Cc: dwysocha@redhat.com, linux-cachefs@redhat.com, v9fs-developer@lists.sourceforge.net, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 07 Apr 2021 16:47:31 +0100 Message-ID: <161781045123.463527.14533348855710902201.stgit@warthog.procyon.org.uk> In-Reply-To: <161781041339.463527.18139104281901492882.stgit@warthog.procyon.org.uk> References: <161781041339.463527.18139104281901492882.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Reorder the netfs library API functions slightly to log the netfs_read tracepoint after calling out to the network filesystem to begin a caching operation. This sets rreq->cookie_debug_id so that it can be logged in tracepoints. Signed-off-by: David Howells --- fs/netfs/read_helper.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c index 0066db21aa11..8040b76da1b6 100644 --- a/fs/netfs/read_helper.c +++ b/fs/netfs/read_helper.c @@ -890,15 +890,16 @@ void netfs_readahead(struct readahead_control *ractl, rreq->start = readahead_pos(ractl); rreq->len = readahead_length(ractl); - netfs_stat(&netfs_n_rh_readahead); - trace_netfs_read(rreq, readahead_pos(ractl), readahead_length(ractl), - netfs_read_trace_readahead); - if (ops->begin_cache_operation) { ret = ops->begin_cache_operation(rreq); if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS) goto cleanup_free; } + + netfs_stat(&netfs_n_rh_readahead); + trace_netfs_read(rreq, readahead_pos(ractl), readahead_length(ractl), + netfs_read_trace_readahead); + netfs_rreq_expand(rreq, ractl); atomic_set(&rreq->nr_rd_ops, 1); @@ -968,9 +969,6 @@ int netfs_readpage(struct file *file, rreq->start = page_index(page) * PAGE_SIZE; rreq->len = thp_size(page); - netfs_stat(&netfs_n_rh_readpage); - trace_netfs_read(rreq, rreq->start, rreq->len, netfs_read_trace_readpage); - if (ops->begin_cache_operation) { ret = ops->begin_cache_operation(rreq); if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS) { @@ -979,6 +977,9 @@ int netfs_readpage(struct file *file, } } + netfs_stat(&netfs_n_rh_readpage); + trace_netfs_read(rreq, rreq->start, rreq->len, netfs_read_trace_readpage); + netfs_get_read_request(rreq); atomic_set(&rreq->nr_rd_ops, 1); @@ -1111,15 +1112,15 @@ int netfs_write_begin(struct file *file, struct address_space *mapping, __set_bit(NETFS_RREQ_NO_UNLOCK_PAGE, &rreq->flags); netfs_priv = NULL; - netfs_stat(&netfs_n_rh_write_begin); - trace_netfs_read(rreq, pos, len, netfs_read_trace_write_begin); - if (ops->begin_cache_operation) { ret = ops->begin_cache_operation(rreq); if (ret == -ENOMEM || ret == -EINTR || ret == -ERESTARTSYS) - goto error; + goto error_put; } + 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. */