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Thu, 24 Oct 2024 14:07:06 +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, Linus Torvalds Subject: [PATCH 10/27] netfs: Drop the was_async arg from netfs_read_subreq_terminated() Date: Thu, 24 Oct 2024 15:05:08 +0100 Message-ID: <20241024140539.3828093-11-dhowells@redhat.com> In-Reply-To: <20241024140539.3828093-1-dhowells@redhat.com> References: <20241024140539.3828093-1-dhowells@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 X-Stat-Signature: xi9k8fhnjg8cncgktgknu8bxdik1ed7c X-Rspamd-Queue-Id: 4686640023 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1729778827-862133 X-HE-Meta: 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 rbmXdVDC a8ptZbiE44JWV3U2c+yH1+NwDItRQFhpDwHVcj0c4aD9EYGyE+ApK8sprrMFsxEj7HsZDP7HM6Ya5EPFSChGcB9yGjlDvqVMPbR0KYJhdO1Ffvff9aUa3M0MdC1ujGd8GAk7alf71oLU+hR/tvjC3sC0+Ezntdpp9rzxXQNC1lg1H245hvYqjte7D/9hQ22eFSOSA/gpnyMdxLRYU8gB1E+1afNjYPqEskVhFSuZ3O7vV/1mAhc9SZpIRy8OJY2Dmq1UXi8RfcZAzC+VKgVEDQ5Xv0tur1HBp48Lmoq6V3XJL6L5smycd58DQHGAY0EIDPT82ZfAEXvz7uZVV7vcCXFSZuN+5dtVAe8KynMHgRVclusLc0NQItAvR9bREyUBp2KbWBlM+/pcVEXMDTYcYvnz+gdnBtMhWL6YfZjSc4S0YEw+qVVd1LfuXos4ipiWmMs4YrJuBzLppRrt1PsOP7zSNhrNomSjXk5Gx 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: Drop the was_async argument from netfs_read_subreq_terminated(). Almost every caller is either in process context and passes false. Some filesystems delegate the call to a workqueue to avoid doing the work in their network message queue parsing thread. The only exception is netfs_cache_read_terminated() which handles completion in the cache - which is usually a callback from the backing filesystem in softirq context, though it can be from process context if an error occurred. In this case, delegate to a workqueue. Suggested-by: Linus Torvalds Link: https://lore.kernel.org/r/CAHk-=wiVC5Cgyz6QKXFu6fTaA6h4CjexDR-OV9kL6Vo5x9v8=A@mail.gmail.com/ Signed-off-by: David Howells cc: Jeff Layton cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/9p/vfs_addr.c | 2 +- fs/afs/file.c | 6 ++--- fs/afs/fsclient.c | 2 +- fs/afs/yfsclient.c | 2 +- fs/ceph/addr.c | 6 ++--- fs/netfs/buffered_read.c | 6 ++--- fs/netfs/direct_read.c | 2 +- fs/netfs/internal.h | 2 +- fs/netfs/objects.c | 2 +- fs/netfs/read_collect.c | 53 +++++++++------------------------------- fs/netfs/read_retry.c | 2 +- fs/nfs/fscache.c | 2 +- fs/nfs/fscache.h | 2 +- fs/smb/client/file.c | 2 +- include/linux/netfs.h | 4 +-- 15 files changed, 33 insertions(+), 62 deletions(-) diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c index 58a6bd284d88..e4144e1a10a9 100644 --- a/fs/9p/vfs_addr.c +++ b/fs/9p/vfs_addr.c @@ -84,7 +84,7 @@ static void v9fs_issue_read(struct netfs_io_subrequest *subreq) subreq->transferred += total; subreq->error = err; - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); } /** diff --git a/fs/afs/file.c b/fs/afs/file.c index 56248a078bca..f717168da4ab 100644 --- a/fs/afs/file.c +++ b/fs/afs/file.c @@ -247,7 +247,7 @@ static void afs_fetch_data_notify(struct afs_operation *op) if (req->pos + req->actual_len >= req->file_size) __set_bit(NETFS_SREQ_HIT_EOF, &subreq->flags); subreq->error = error; - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); req->subreq = NULL; } else if (req->done) { req->done(req); @@ -304,7 +304,7 @@ int afs_fetch_data(struct afs_vnode *vnode, struct afs_read *req) if (IS_ERR(op)) { if (req->subreq) { req->subreq->error = PTR_ERR(op); - netfs_read_subreq_terminated(req->subreq, false); + netfs_read_subreq_terminated(req->subreq); } return PTR_ERR(op); } @@ -325,7 +325,7 @@ static void afs_read_worker(struct work_struct *work) fsreq = afs_alloc_read(GFP_NOFS); if (!fsreq) { subreq->error = -ENOMEM; - return netfs_read_subreq_terminated(subreq, false); + return netfs_read_subreq_terminated(subreq); } fsreq->subreq = subreq; diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c index 098fa034a1cc..784f7daab112 100644 --- a/fs/afs/fsclient.c +++ b/fs/afs/fsclient.c @@ -352,7 +352,7 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call) ret = afs_extract_data(call, true); if (req->subreq) { req->subreq->transferred += count_before - call->iov_len; - netfs_read_subreq_progress(req->subreq, false); + netfs_read_subreq_progress(req->subreq); } if (ret < 0) return ret; diff --git a/fs/afs/yfsclient.c b/fs/afs/yfsclient.c index 024227aba4cd..368cf277d801 100644 --- a/fs/afs/yfsclient.c +++ b/fs/afs/yfsclient.c @@ -398,7 +398,7 @@ static int yfs_deliver_fs_fetch_data64(struct afs_call *call) ret = afs_extract_data(call, true); if (req->subreq) { req->subreq->transferred += count_before - call->iov_len; - netfs_read_subreq_progress(req->subreq, false); + netfs_read_subreq_progress(req->subreq); } if (ret < 0) return ret; diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c index 459249ba6319..d008e7334db7 100644 --- a/fs/ceph/addr.c +++ b/fs/ceph/addr.c @@ -255,7 +255,7 @@ static void finish_netfs_read(struct ceph_osd_request *req) } subreq->error = err; trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress); - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); iput(req->r_inode); ceph_dec_osd_stopping_blocker(fsc->mdsc); } @@ -317,7 +317,7 @@ static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq) out: subreq->error = err; trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress); - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); return true; } @@ -431,7 +431,7 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq) ceph_osdc_put_request(req); if (err) { subreq->error = err; - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); } doutc(cl, "%llx.%llx result %d\n", ceph_vinop(inode), err); } diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index 82c3b9957958..6fd4f3bef3b4 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -154,7 +154,7 @@ static void netfs_cache_read_terminated(void *priv, ssize_t transferred_or_error } else { subreq->error = transferred_or_error; } - netfs_read_subreq_terminated(subreq, was_async); + schedule_work(&subreq->work); } /* @@ -261,7 +261,7 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq) slice = netfs_prepare_read_iterator(subreq); __set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags); subreq->error = 0; - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); goto done; } @@ -283,7 +283,7 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq) } while (size > 0); if (atomic_dec_and_test(&rreq->nr_outstanding)) - netfs_rreq_terminated(rreq, false); + netfs_rreq_terminated(rreq); /* Defer error return as we may need to wait for outstanding I/O. */ cmpxchg(&rreq->error, 0, ret); diff --git a/fs/netfs/direct_read.c b/fs/netfs/direct_read.c index a3f23adbae0f..54027fd14904 100644 --- a/fs/netfs/direct_read.c +++ b/fs/netfs/direct_read.c @@ -100,7 +100,7 @@ static int netfs_dispatch_unbuffered_reads(struct netfs_io_request *rreq) } while (size > 0); if (atomic_dec_and_test(&rreq->nr_outstanding)) - netfs_rreq_terminated(rreq, false); + netfs_rreq_terminated(rreq); return ret; } diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index 73887525e939..ba32ca61063c 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -85,7 +85,7 @@ 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); +void netfs_rreq_terminated(struct netfs_io_request *rreq); /* * read_pgpriv2.c diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c index f10fd56efa17..8c98b70eb3a4 100644 --- a/fs/netfs/objects.c +++ b/fs/netfs/objects.c @@ -56,7 +56,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, origin == NETFS_READ_GAPS || origin == NETFS_READ_FOR_WRITE || origin == NETFS_DIO_READ) - INIT_WORK(&rreq->work, netfs_read_termination_worker); + INIT_WORK(&rreq->work, NULL); else INIT_WORK(&rreq->work, netfs_write_collection_worker); diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c index 00358894fac4..146abb2e399a 100644 --- a/fs/netfs/read_collect.c +++ b/fs/netfs/read_collect.c @@ -85,7 +85,7 @@ static void netfs_unlock_read_folio(struct netfs_io_subrequest *subreq, * 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) +static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq) { struct netfs_io_subrequest *prev, *next; struct netfs_io_request *rreq = subreq->rreq; @@ -228,8 +228,7 @@ static bool netfs_consume_read_data(struct netfs_io_subrequest *subreq, bool was subreq->curr_folioq_slot = slot; if (folioq && folioq_folio(folioq, slot)) subreq->curr_folio_order = folioq->orders[slot]; - if (!was_async) - cond_resched(); + cond_resched(); goto next_folio; } @@ -365,7 +364,7 @@ static void netfs_rreq_assess_dio(struct netfs_io_request *rreq) * 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) +void netfs_rreq_terminated(struct netfs_io_request *rreq) { trace_netfs_rreq(rreq, netfs_rreq_trace_assess); @@ -392,56 +391,29 @@ static void netfs_rreq_assess(struct netfs_io_request *rreq) 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) +void netfs_read_subreq_progress(struct netfs_io_subrequest *subreq) { struct netfs_io_request *rreq = subreq->rreq; + might_sleep(); + 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); + netfs_consume_read_data(subreq); __clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags); } } @@ -450,7 +422,6 @@ 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. - * @was_async: True if we're in an asynchronous context. * * This tells the read helper that a contributory I/O operation has terminated, * one way or another, and that it should integrate the results. @@ -464,7 +435,7 @@ EXPORT_SYMBOL(netfs_read_subreq_progress); * Before calling, the filesystem should update subreq->transferred to track * the amount of data copied into the output buffer. */ -void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq, bool was_async) +void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq) { struct netfs_io_request *rreq = subreq->rreq; @@ -498,7 +469,7 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq, bool was_a (rreq->origin == NETFS_READAHEAD || rreq->origin == NETFS_READPAGE || rreq->origin == NETFS_READ_FOR_WRITE)) { - netfs_consume_read_data(subreq, was_async); + netfs_consume_read_data(subreq); __clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags); } rreq->transferred += subreq->transferred; @@ -540,9 +511,9 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq, bool was_a } if (atomic_dec_and_test(&rreq->nr_outstanding)) - netfs_rreq_terminated(rreq, was_async); + netfs_rreq_terminated(rreq); - netfs_put_subrequest(subreq, was_async, netfs_sreq_trace_put_terminated); + netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_terminated); } EXPORT_SYMBOL(netfs_read_subreq_terminated); @@ -558,6 +529,6 @@ void netfs_read_subreq_termination_worker(struct work_struct *work) struct netfs_io_subrequest *subreq = container_of(work, struct netfs_io_subrequest, work); - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); } EXPORT_SYMBOL(netfs_read_subreq_termination_worker); diff --git a/fs/netfs/read_retry.c b/fs/netfs/read_retry.c index 0fe7677b4022..d1986cec3db7 100644 --- a/fs/netfs/read_retry.c +++ b/fs/netfs/read_retry.c @@ -232,7 +232,7 @@ void netfs_retry_reads(struct netfs_io_request *rreq) netfs_retry_read_subrequests(rreq); if (atomic_dec_and_test(&rreq->nr_outstanding)) - netfs_rreq_terminated(rreq, false); + netfs_rreq_terminated(rreq); } /* diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c index e585a7bcfe4d..2f3c4f773d73 100644 --- a/fs/nfs/fscache.c +++ b/fs/nfs/fscache.c @@ -309,7 +309,7 @@ static void nfs_netfs_issue_read(struct netfs_io_subrequest *sreq) netfs = nfs_netfs_alloc(sreq); if (!netfs) { sreq->error = -ENOMEM; - return netfs_read_subreq_terminated(sreq, false); + return netfs_read_subreq_terminated(sreq); } pgio.pg_netfs = netfs; /* used in completion */ diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h index 1d86f7cc7195..9d86868f4998 100644 --- a/fs/nfs/fscache.h +++ b/fs/nfs/fscache.h @@ -75,7 +75,7 @@ static inline void nfs_netfs_put(struct nfs_netfs_io_data *netfs) netfs->sreq->transferred = min_t(s64, netfs->sreq->len, atomic64_read(&netfs->transferred)); netfs->sreq->error = netfs->error; - netfs_read_subreq_terminated(netfs->sreq, false); + netfs_read_subreq_terminated(netfs->sreq); kfree(netfs); } static inline void nfs_netfs_inode_init(struct nfs_inode *nfsi) diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index 10dd440f8178..27a1757a278e 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -228,7 +228,7 @@ static void cifs_issue_read(struct netfs_io_subrequest *subreq) failed: subreq->error = rc; - netfs_read_subreq_terminated(subreq, false); + netfs_read_subreq_terminated(subreq); } /* diff --git a/include/linux/netfs.h b/include/linux/netfs.h index a3aa36c1869f..738c9c8763f0 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -428,8 +428,8 @@ 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_read_subreq_progress(struct netfs_io_subrequest *subreq, bool was_async); -void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq, bool was_async); +void netfs_read_subreq_progress(struct netfs_io_subrequest *subreq); +void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq); void netfs_read_subreq_termination_worker(struct work_struct *work); void netfs_get_subrequest(struct netfs_io_subrequest *subreq, enum netfs_sreq_ref_trace what);