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Fri, 25 Oct 2024 20:41:30 +0000 (UTC) From: David Howells To: Christian Brauner , Steve French , Matthew Wilcox Cc: David Howells , Jeff Layton , Gao Xiang , Dominique Martinet , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Eric Van Hensbergen , Ilya Dryomov , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-cachefs@redhat.com Subject: [PATCH v2 11/31] netfs: Don't use bh spinlock Date: Fri, 25 Oct 2024 21:39:38 +0100 Message-ID: <20241025204008.4076565-12-dhowells@redhat.com> In-Reply-To: <20241025204008.4076565-1-dhowells@redhat.com> References: <20241025204008.4076565-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 X-Rspamd-Queue-Id: BEFB0C001E X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: wsy7aqcq4a1bsmsn3yper7188eot7yfx X-HE-Tag: 1729888883-752699 X-HE-Meta: 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 lBrM72Du jtWkc50If3wINxn+cElyMQ1HD4B4UuRwlNVMwbkI6/lKEDBIupt5kpDm1Cc5QC9RKxThWuf9Enb2avCgl3kpdSVtxgpbjq92F8BMbkzS1usgkcUwTwF9467OE+bWHN56QJ/lx+VZBfbY8O88s2VEUoRA8TldDBhd/MHk/jJzWnkLLzwsreGkJO0I6rCN7tV1aZvxNe7eCm+E6KGuz3sqHhIEQuQqJuZ/TaJCVuTfe0jUR8uwCmc/5cA7JXzPj/9jIWTfp2AhX4O1M8BnzxZRXQhpHRVvrqO0NBVBsL2eLvzsZEQs1eO+lwk3Cd+9sG7YEm7ZJvIVRInutx1JvTFD5nAAMIzjqGF0fmCdaoX6M6CzpOt98bUPRKLTtewaYM3v/SMj+sv/ivDxf8SAQJiCu6rIes5yPVJlAFDcGhTsQLofTGydyAh2OO3RMCzUhra/lyMXtooKRbf5KequJFbPe0aw3OcvarQklI66yXQDP2EtjWUA= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: All the accessing of the subrequest lists is now done in process context, possibly in a workqueue, but not now in a BH context, so we don't need the lock against BH interference when taking the netfs_io_request::lock spinlock. Signed-off-by: David Howells cc: Jeff Layton cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- fs/netfs/buffered_read.c | 4 ++-- fs/netfs/direct_read.c | 4 ++-- fs/netfs/read_collect.c | 20 ++++++++++---------- fs/netfs/read_retry.c | 8 ++++---- fs/netfs/write_collect.c | 4 ++-- fs/netfs/write_issue.c | 4 ++-- 6 files changed, 22 insertions(+), 22 deletions(-) diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index 6fd4f3bef3b4..4a48b79b8807 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -200,12 +200,12 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq) subreq->len = size; atomic_inc(&rreq->nr_outstanding); - spin_lock_bh(&rreq->lock); + spin_lock(&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); + spin_unlock(&rreq->lock); source = netfs_cache_prepare_read(rreq, subreq, rreq->i_size); subreq->source = source; diff --git a/fs/netfs/direct_read.c b/fs/netfs/direct_read.c index 54027fd14904..1a20cc3979c7 100644 --- a/fs/netfs/direct_read.c +++ b/fs/netfs/direct_read.c @@ -68,12 +68,12 @@ static int netfs_dispatch_unbuffered_reads(struct netfs_io_request *rreq) subreq->len = size; atomic_inc(&rreq->nr_outstanding); - spin_lock_bh(&rreq->lock); + spin_lock(&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); + spin_unlock(&rreq->lock); netfs_stat(&netfs_n_rh_download); if (rreq->netfs_ops->prepare_read) { diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c index 146abb2e399a..53ef7e0f3e9c 100644 --- a/fs/netfs/read_collect.c +++ b/fs/netfs/read_collect.c @@ -142,7 +142,7 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *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); + spin_lock(&rreq->lock); prev_donated = subreq->prev_donated; next_donated = subreq->next_donated; subreq->start -= prev_donated; @@ -155,7 +155,7 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq) next_donated = subreq->next_donated = 0; } trace_netfs_sreq(subreq, netfs_sreq_trace_add_donations); - spin_unlock_bh(&rreq->lock); + spin_unlock(&rreq->lock); } avail = subreq->transferred; @@ -184,18 +184,18 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq) } else if (fpos < start) { excess = fend - subreq->start; - spin_lock_bh(&rreq->lock); + spin_lock(&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); + spin_unlock(&rreq->lock); goto donation_changed; } if (list_is_first(&subreq->rreq_link, &rreq->subrequests)) { - spin_unlock_bh(&rreq->lock); + spin_unlock(&rreq->lock); pr_err("Can't donate prior to front\n"); goto bad; } @@ -211,7 +211,7 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq) if (subreq->consumed >= subreq->len) goto remove_subreq_locked; - spin_unlock_bh(&rreq->lock); + spin_unlock(&rreq->lock); } else { pr_err("fpos > start\n"); goto bad; @@ -239,11 +239,11 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq) /* 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); + spin_lock(&rreq->lock); if (subreq->prev_donated != prev_donated || subreq->next_donated != next_donated) { - spin_unlock_bh(&rreq->lock); + spin_unlock(&rreq->lock); cond_resched(); goto donation_changed; } @@ -293,11 +293,11 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq) goto remove_subreq_locked; remove_subreq: - spin_lock_bh(&rreq->lock); + spin_lock(&rreq->lock); remove_subreq_locked: subreq->consumed = subreq->len; list_del(&subreq->rreq_link); - spin_unlock_bh(&rreq->lock); + spin_unlock(&rreq->lock); netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_consumed); return true; diff --git a/fs/netfs/read_retry.c b/fs/netfs/read_retry.c index d1986cec3db7..264f3cb6a7dc 100644 --- a/fs/netfs/read_retry.c +++ b/fs/netfs/read_retry.c @@ -139,12 +139,12 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq) __clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); __set_bit(NETFS_SREQ_RETRYING, &subreq->flags); - spin_lock_bh(&rreq->lock); + spin_lock(&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); + spin_unlock(&rreq->lock); BUG_ON(!len); @@ -215,9 +215,9 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq) __clear_bit(NETFS_SREQ_NEED_RETRY, &subreq->flags); __clear_bit(NETFS_SREQ_RETRYING, &subreq->flags); } - spin_lock_bh(&rreq->lock); + spin_lock(&rreq->lock); list_splice_tail_init(&queue, &rreq->subrequests); - spin_unlock_bh(&rreq->lock); + spin_unlock(&rreq->lock); } /* diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c index 85e8e94da90a..d291b31dd074 100644 --- a/fs/netfs/write_collect.c +++ b/fs/netfs/write_collect.c @@ -238,14 +238,14 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq) cancel: /* Remove if completely consumed. */ - spin_lock_bh(&wreq->lock); + spin_lock(&wreq->lock); remove = front; list_del_init(&front->rreq_link); front = list_first_entry_or_null(&stream->subrequests, struct netfs_io_subrequest, rreq_link); stream->front = front; - spin_unlock_bh(&wreq->lock); + spin_unlock(&wreq->lock); netfs_put_subrequest(remove, false, notes & SAW_FAILURE ? netfs_sreq_trace_put_cancel : diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c index c186221b45c0..10b5300b9448 100644 --- a/fs/netfs/write_issue.c +++ b/fs/netfs/write_issue.c @@ -203,7 +203,7 @@ static void netfs_prepare_write(struct netfs_io_request *wreq, * the list. The collector only goes nextwards and uses the lock to * remove entries off of the front. */ - spin_lock_bh(&wreq->lock); + spin_lock(&wreq->lock); list_add_tail(&subreq->rreq_link, &stream->subrequests); if (list_is_first(&subreq->rreq_link, &stream->subrequests)) { stream->front = subreq; @@ -214,7 +214,7 @@ static void netfs_prepare_write(struct netfs_io_request *wreq, } } - spin_unlock_bh(&wreq->lock); + spin_unlock(&wreq->lock); stream->construct = subreq; }