6.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Howells dhowells@redhat.com
[ Upstream commit 2b1424cd131cfaba4cf7040473133d26cddac088 ]
Fix further inconsistencies in the use of waitqueues (clear_and_wake_up_bit() vs private waitqueue).
Move some of this stuff from the read and write sides into common code so that it can be done in fewer places.
To make this work, async I/O needs to set NETFS_RREQ_OFFLOAD_COLLECTION to indicate that a workqueue will do the collecting and places that call the wait function need to deal with it returning the amount transferred.
Fixes: e2d46f2ec332 ("netfs: Change the read result collector to only use one work item") Signed-off-by: David Howells dhowells@redhat.com Link: https://lore.kernel.org/20250519090707.2848510-5-dhowells@redhat.com cc: Marc Dionne marc.dionne@auristor.com cc: Steve French stfrench@microsoft.com cc: Ihor Solodrai ihor.solodrai@pm.me cc: Eric Van Hensbergen ericvh@kernel.org cc: Latchesar Ionkov lucho@ionkov.net cc: Dominique Martinet asmadeus@codewreck.org cc: Christian Schoenebeck linux_oss@crudebyte.com cc: Paulo Alcantara pc@manguebit.com cc: Jeff Layton jlayton@kernel.org cc: v9fs@lists.linux.dev cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/netfs/buffered_read.c | 2 +- fs/netfs/buffered_write.c | 2 +- fs/netfs/direct_read.c | 4 +- fs/netfs/direct_write.c | 10 +- fs/netfs/internal.h | 33 ++++-- fs/netfs/misc.c | 218 ++++++++++++++++++++++++++++++++++++++ fs/netfs/read_collect.c | 139 +----------------------- fs/netfs/read_retry.c | 24 +---- fs/netfs/write_collect.c | 36 ++----- fs/netfs/write_issue.c | 28 +++-- fs/netfs/write_retry.c | 12 +-- 11 files changed, 284 insertions(+), 224 deletions(-)
diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index cb6202efc4668..fd4619275801b 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -312,7 +312,7 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq) if (unlikely(size > 0)) { smp_wmb(); /* Write lists before ALL_QUEUED. */ set_bit(NETFS_RREQ_ALL_QUEUED, &rreq->flags); - netfs_wake_read_collector(rreq); + netfs_wake_collector(rreq); }
/* Defer error return as we may need to wait for outstanding I/O. */ diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c index b4826360a4111..dbb544e183d13 100644 --- a/fs/netfs/buffered_write.c +++ b/fs/netfs/buffered_write.c @@ -386,7 +386,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, wbc_detach_inode(&wbc); if (ret2 == -EIOCBQUEUED) return ret2; - if (ret == 0) + if (ret == 0 && ret2 < 0) ret = ret2; }
diff --git a/fs/netfs/direct_read.c b/fs/netfs/direct_read.c index cb3c6dc0b1654..a24e63d2c8186 100644 --- a/fs/netfs/direct_read.c +++ b/fs/netfs/direct_read.c @@ -103,7 +103,7 @@ static int netfs_dispatch_unbuffered_reads(struct netfs_io_request *rreq) rreq->netfs_ops->issue_read(subreq);
if (test_bit(NETFS_RREQ_PAUSE, &rreq->flags)) - netfs_wait_for_pause(rreq); + netfs_wait_for_paused_read(rreq); if (test_bit(NETFS_RREQ_FAILED, &rreq->flags)) break; if (test_bit(NETFS_RREQ_BLOCKED, &rreq->flags) && @@ -115,7 +115,7 @@ static int netfs_dispatch_unbuffered_reads(struct netfs_io_request *rreq) if (unlikely(size > 0)) { smp_wmb(); /* Write lists before ALL_QUEUED. */ set_bit(NETFS_RREQ_ALL_QUEUED, &rreq->flags); - netfs_wake_read_collector(rreq); + netfs_wake_collector(rreq); }
return ret; diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c index c98f1676f86df..fa9a5bf3c6d51 100644 --- a/fs/netfs/direct_write.c +++ b/fs/netfs/direct_write.c @@ -87,6 +87,8 @@ ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter * }
__set_bit(NETFS_RREQ_USE_IO_ITER, &wreq->flags); + if (async) + __set_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &wreq->flags);
/* Copy the data into the bounce buffer and encrypt it. */ // TODO @@ -105,13 +107,9 @@ ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *
if (!async) { trace_netfs_rreq(wreq, netfs_rreq_trace_wait_ip); - wait_on_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS, - TASK_UNINTERRUPTIBLE); - ret = wreq->error; - if (ret == 0) { - ret = wreq->transferred; + ret = netfs_wait_for_write(wreq); + if (ret > 0) iocb->ki_pos += ret; - } } else { ret = -EIOCBQUEUED; } diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index b6500a7cda81d..e2ee9183392b9 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -62,6 +62,14 @@ static inline void netfs_proc_del_rreq(struct netfs_io_request *rreq) {} struct folio_queue *netfs_buffer_make_space(struct netfs_io_request *rreq, enum netfs_folioq_trace trace); void netfs_reset_iter(struct netfs_io_subrequest *subreq); +void netfs_wake_collector(struct netfs_io_request *rreq); +void netfs_subreq_clear_in_progress(struct netfs_io_subrequest *subreq); +void netfs_wait_for_in_progress_stream(struct netfs_io_request *rreq, + struct netfs_io_stream *stream); +ssize_t netfs_wait_for_read(struct netfs_io_request *rreq); +ssize_t netfs_wait_for_write(struct netfs_io_request *rreq); +void netfs_wait_for_paused_read(struct netfs_io_request *rreq); +void netfs_wait_for_paused_write(struct netfs_io_request *rreq);
/* * objects.c @@ -91,11 +99,9 @@ static inline void netfs_see_subrequest(struct netfs_io_subrequest *subreq, /* * read_collect.c */ +bool netfs_read_collection(struct netfs_io_request *rreq); void netfs_read_collection_worker(struct work_struct *work); -void netfs_wake_read_collector(struct netfs_io_request *rreq); void netfs_cache_read_terminated(void *priv, ssize_t transferred_or_error); -ssize_t netfs_wait_for_read(struct netfs_io_request *rreq); -void netfs_wait_for_pause(struct netfs_io_request *rreq);
/* * read_pgpriv2.c @@ -175,8 +181,8 @@ static inline void netfs_stat_d(atomic_t *stat) * write_collect.c */ int netfs_folio_written_back(struct folio *folio); +bool netfs_write_collection(struct netfs_io_request *wreq); void netfs_write_collection_worker(struct work_struct *work); -void netfs_wake_write_collector(struct netfs_io_request *wreq);
/* * write_issue.c @@ -197,8 +203,8 @@ 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, struct folio **writethrough_cache); -int netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, - struct folio *writethrough_cache); +ssize_t netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, + struct folio *writethrough_cache); int netfs_unbuffered_write(struct netfs_io_request *wreq, bool may_wait, size_t len);
/* @@ -253,6 +259,21 @@ static inline void netfs_put_group_many(struct netfs_group *netfs_group, int nr) netfs_group->free(netfs_group); }
+/* + * Clear and wake up a NETFS_RREQ_* flag bit on a request. + */ +static inline void netfs_wake_rreq_flag(struct netfs_io_request *rreq, + unsigned int rreq_flag, + enum netfs_rreq_trace trace) +{ + if (test_bit(rreq_flag, &rreq->flags)) { + trace_netfs_rreq(rreq, trace); + clear_bit_unlock(rreq_flag, &rreq->flags); + smp_mb__after_atomic(); /* Set flag before task state */ + wake_up(&rreq->waitq); + } +} + /* * fscache-cache.c */ diff --git a/fs/netfs/misc.c b/fs/netfs/misc.c index 7099aa07737ac..77e7f7c79d27c 100644 --- a/fs/netfs/misc.c +++ b/fs/netfs/misc.c @@ -313,3 +313,221 @@ bool netfs_release_folio(struct folio *folio, gfp_t gfp) return true; } EXPORT_SYMBOL(netfs_release_folio); + +/* + * Wake the collection work item. + */ +void netfs_wake_collector(struct netfs_io_request *rreq) +{ + if (test_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &rreq->flags) && + !test_bit(NETFS_RREQ_RETRYING, &rreq->flags)) { + queue_work(system_unbound_wq, &rreq->work); + } else { + trace_netfs_rreq(rreq, netfs_rreq_trace_wake_queue); + wake_up(&rreq->waitq); + } +} + +/* + * Mark a subrequest as no longer being in progress and, if need be, wake the + * collector. + */ +void netfs_subreq_clear_in_progress(struct netfs_io_subrequest *subreq) +{ + struct netfs_io_request *rreq = subreq->rreq; + struct netfs_io_stream *stream = &rreq->io_streams[subreq->stream_nr]; + + clear_bit_unlock(NETFS_SREQ_IN_PROGRESS, &subreq->flags); + smp_mb__after_atomic(); /* Clear IN_PROGRESS before task state */ + + /* If we are at the head of the queue, wake up the collector. */ + if (list_is_first(&subreq->rreq_link, &stream->subrequests) || + test_bit(NETFS_RREQ_RETRYING, &rreq->flags)) + netfs_wake_collector(rreq); +} + +/* + * Wait for all outstanding I/O in a stream to quiesce. + */ +void netfs_wait_for_in_progress_stream(struct netfs_io_request *rreq, + struct netfs_io_stream *stream) +{ + struct netfs_io_subrequest *subreq; + DEFINE_WAIT(myself); + + list_for_each_entry(subreq, &stream->subrequests, rreq_link) { + if (!test_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags)) + continue; + + trace_netfs_rreq(rreq, netfs_rreq_trace_wait_queue); + for (;;) { + prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE); + + if (!test_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags)) + break; + + trace_netfs_sreq(subreq, netfs_sreq_trace_wait_for); + schedule(); + trace_netfs_rreq(rreq, netfs_rreq_trace_woke_queue); + } + } + + finish_wait(&rreq->waitq, &myself); +} + +/* + * Perform collection in app thread if not offloaded to workqueue. + */ +static int netfs_collect_in_app(struct netfs_io_request *rreq, + bool (*collector)(struct netfs_io_request *rreq)) +{ + bool need_collect = false, inactive = true; + + for (int i = 0; i < NR_IO_STREAMS; i++) { + struct netfs_io_subrequest *subreq; + struct netfs_io_stream *stream = &rreq->io_streams[i]; + + if (!stream->active) + continue; + inactive = false; + trace_netfs_collect_stream(rreq, stream); + subreq = list_first_entry_or_null(&stream->subrequests, + struct netfs_io_subrequest, + rreq_link); + if (subreq && + (!test_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags) || + test_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags))) { + need_collect = true; + break; + } + } + + if (!need_collect && !inactive) + return 0; /* Sleep */ + + __set_current_state(TASK_RUNNING); + if (collector(rreq)) { + /* Drop the ref from the NETFS_RREQ_IN_PROGRESS flag. */ + netfs_put_request(rreq, netfs_rreq_trace_put_work_ip); + return 1; /* Done */ + } + + if (inactive) { + WARN(true, "Failed to collect inactive req R=%08x\n", + rreq->debug_id); + cond_resched(); + } + return 2; /* Again */ +} + +/* + * Wait for a request to complete, successfully or otherwise. + */ +static ssize_t netfs_wait_for_request(struct netfs_io_request *rreq, + bool (*collector)(struct netfs_io_request *rreq)) +{ + DEFINE_WAIT(myself); + ssize_t ret; + + for (;;) { + trace_netfs_rreq(rreq, netfs_rreq_trace_wait_queue); + prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE); + + if (!test_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &rreq->flags)) { + switch (netfs_collect_in_app(rreq, collector)) { + case 0: + break; + case 1: + goto all_collected; + case 2: + continue; + } + } + + if (!test_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags)) + break; + + schedule(); + trace_netfs_rreq(rreq, netfs_rreq_trace_woke_queue); + } + +all_collected: + finish_wait(&rreq->waitq, &myself); + + ret = rreq->error; + if (ret == 0) { + ret = rreq->transferred; + switch (rreq->origin) { + case NETFS_DIO_READ: + case NETFS_DIO_WRITE: + case NETFS_READ_SINGLE: + case NETFS_UNBUFFERED_WRITE: + break; + default: + if (rreq->submitted < rreq->len) { + trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_read); + ret = -EIO; + } + break; + } + } + + return ret; +} + +ssize_t netfs_wait_for_read(struct netfs_io_request *rreq) +{ + return netfs_wait_for_request(rreq, netfs_read_collection); +} + +ssize_t netfs_wait_for_write(struct netfs_io_request *rreq) +{ + return netfs_wait_for_request(rreq, netfs_write_collection); +} + +/* + * Wait for a paused operation to unpause or complete in some manner. + */ +static void netfs_wait_for_pause(struct netfs_io_request *rreq, + bool (*collector)(struct netfs_io_request *rreq)) +{ + DEFINE_WAIT(myself); + + trace_netfs_rreq(rreq, netfs_rreq_trace_wait_pause); + + for (;;) { + trace_netfs_rreq(rreq, netfs_rreq_trace_wait_queue); + prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE); + + if (!test_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &rreq->flags)) { + switch (netfs_collect_in_app(rreq, collector)) { + case 0: + break; + case 1: + goto all_collected; + case 2: + continue; + } + } + + if (!test_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags) || + !test_bit(NETFS_RREQ_PAUSE, &rreq->flags)) + break; + + schedule(); + trace_netfs_rreq(rreq, netfs_rreq_trace_woke_queue); + } + +all_collected: + finish_wait(&rreq->waitq, &myself); +} + +void netfs_wait_for_paused_read(struct netfs_io_request *rreq) +{ + return netfs_wait_for_pause(rreq, netfs_read_collection); +} + +void netfs_wait_for_paused_write(struct netfs_io_request *rreq) +{ + return netfs_wait_for_pause(rreq, netfs_write_collection); +} diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c index 1197ebce56757..900dd51c3b941 100644 --- a/fs/netfs/read_collect.c +++ b/fs/netfs/read_collect.c @@ -315,14 +315,8 @@ static void netfs_collect_read_results(struct netfs_io_request *rreq)
if (notes & NEED_RETRY) goto need_retry; - if ((notes & MADE_PROGRESS) && test_bit(NETFS_RREQ_PAUSE, &rreq->flags)) { - trace_netfs_rreq(rreq, netfs_rreq_trace_unpause); - clear_bit_unlock(NETFS_RREQ_PAUSE, &rreq->flags); - smp_mb__after_atomic(); /* Set PAUSE before task state */ - wake_up(&rreq->waitq); - } - if (notes & MADE_PROGRESS) { + netfs_wake_rreq_flag(rreq, NETFS_RREQ_PAUSE, netfs_rreq_trace_unpause); //cond_resched(); goto reassess; } @@ -399,7 +393,7 @@ static void netfs_rreq_assess_single(struct netfs_io_request *rreq) * Note that we're in normal kernel thread context at this point, possibly * running on a workqueue. */ -static bool netfs_read_collection(struct netfs_io_request *rreq) +bool netfs_read_collection(struct netfs_io_request *rreq) { struct netfs_io_stream *stream = &rreq->io_streams[0];
@@ -434,8 +428,7 @@ static bool netfs_read_collection(struct netfs_io_request *rreq) } task_io_account_read(rreq->transferred);
- trace_netfs_rreq(rreq, netfs_rreq_trace_wake_ip); - clear_and_wake_up_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags); + netfs_wake_rreq_flag(rreq, NETFS_RREQ_IN_PROGRESS, netfs_rreq_trace_wake_ip); /* As we cleared NETFS_RREQ_IN_PROGRESS, we acquired its ref. */
trace_netfs_rreq(rreq, netfs_rreq_trace_done); @@ -460,20 +453,6 @@ void netfs_read_collection_worker(struct work_struct *work) } }
-/* - * Wake the collection work item. - */ -void netfs_wake_read_collector(struct netfs_io_request *rreq) -{ - if (test_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &rreq->flags) && - !test_bit(NETFS_RREQ_RETRYING, &rreq->flags)) { - queue_work(system_unbound_wq, &rreq->work); - } else { - trace_netfs_rreq(rreq, netfs_rreq_trace_wake_queue); - wake_up(&rreq->waitq); - } -} - /** * netfs_read_subreq_progress - Note progress of a read operation. * @subreq: The read request that has terminated. @@ -502,7 +481,7 @@ void netfs_read_subreq_progress(struct netfs_io_subrequest *subreq) list_is_first(&subreq->rreq_link, &stream->subrequests) ) { __set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags); - netfs_wake_read_collector(rreq); + netfs_wake_collector(rreq); } } EXPORT_SYMBOL(netfs_read_subreq_progress); @@ -526,7 +505,6 @@ EXPORT_SYMBOL(netfs_read_subreq_progress); void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq) { struct netfs_io_request *rreq = subreq->rreq; - struct netfs_io_stream *stream = &rreq->io_streams[0];
switch (subreq->source) { case NETFS_READ_FROM_CACHE: @@ -573,15 +551,7 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq) }
trace_netfs_sreq(subreq, netfs_sreq_trace_terminated); - - clear_bit_unlock(NETFS_SREQ_IN_PROGRESS, &subreq->flags); - smp_mb__after_atomic(); /* Clear IN_PROGRESS before task state */ - - /* If we are at the head of the queue, wake up the collector. */ - if (list_is_first(&subreq->rreq_link, &stream->subrequests) || - test_bit(NETFS_RREQ_RETRYING, &rreq->flags)) - netfs_wake_read_collector(rreq); - + netfs_subreq_clear_in_progress(subreq); netfs_put_subrequest(subreq, netfs_sreq_trace_put_terminated); } EXPORT_SYMBOL(netfs_read_subreq_terminated); @@ -604,102 +574,3 @@ void netfs_cache_read_terminated(void *priv, ssize_t transferred_or_error) } netfs_read_subreq_terminated(subreq); } - -/* - * Wait for the read operation to complete, successfully or otherwise. - */ -ssize_t netfs_wait_for_read(struct netfs_io_request *rreq) -{ - struct netfs_io_subrequest *subreq; - struct netfs_io_stream *stream = &rreq->io_streams[0]; - DEFINE_WAIT(myself); - ssize_t ret; - - for (;;) { - trace_netfs_rreq(rreq, netfs_rreq_trace_wait_queue); - prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE); - - subreq = list_first_entry_or_null(&stream->subrequests, - struct netfs_io_subrequest, rreq_link); - if (subreq && - (!test_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags) || - test_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags))) { - __set_current_state(TASK_RUNNING); - if (netfs_read_collection(rreq)) { - /* Drop the ref from the NETFS_RREQ_IN_PROGRESS flag. */ - netfs_put_request(rreq, netfs_rreq_trace_put_work_ip); - break; - } - continue; - } - - if (!test_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags)) - break; - - schedule(); - trace_netfs_rreq(rreq, netfs_rreq_trace_woke_queue); - } - - finish_wait(&rreq->waitq, &myself); - - ret = rreq->error; - if (ret == 0) { - ret = rreq->transferred; - switch (rreq->origin) { - case NETFS_DIO_READ: - case NETFS_READ_SINGLE: - ret = rreq->transferred; - break; - default: - if (rreq->submitted < rreq->len) { - trace_netfs_failure(rreq, NULL, ret, netfs_fail_short_read); - ret = -EIO; - } - break; - } - } - - return ret; -} - -/* - * Wait for a paused read operation to unpause or complete in some manner. - */ -void netfs_wait_for_pause(struct netfs_io_request *rreq) -{ - struct netfs_io_subrequest *subreq; - struct netfs_io_stream *stream = &rreq->io_streams[0]; - DEFINE_WAIT(myself); - - trace_netfs_rreq(rreq, netfs_rreq_trace_wait_pause); - - for (;;) { - trace_netfs_rreq(rreq, netfs_rreq_trace_wait_queue); - prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE); - - if (!test_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &rreq->flags)) { - subreq = list_first_entry_or_null(&stream->subrequests, - struct netfs_io_subrequest, rreq_link); - if (subreq && - (!test_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags) || - test_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags))) { - __set_current_state(TASK_RUNNING); - if (netfs_read_collection(rreq)) { - /* Drop the ref from the NETFS_RREQ_IN_PROGRESS flag. */ - netfs_put_request(rreq, netfs_rreq_trace_put_work_ip); - break; - } - continue; - } - } - - if (!test_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags) || - !test_bit(NETFS_RREQ_PAUSE, &rreq->flags)) - break; - - schedule(); - trace_netfs_rreq(rreq, netfs_rreq_trace_woke_queue); - } - - finish_wait(&rreq->waitq, &myself); -} diff --git a/fs/netfs/read_retry.c b/fs/netfs/read_retry.c index 1378dc7fa2ccd..b99e84a8170af 100644 --- a/fs/netfs/read_retry.c +++ b/fs/netfs/read_retry.c @@ -257,35 +257,15 @@ static void netfs_retry_read_subrequests(struct netfs_io_request *rreq) */ void netfs_retry_reads(struct netfs_io_request *rreq) { - struct netfs_io_subrequest *subreq; struct netfs_io_stream *stream = &rreq->io_streams[0]; - DEFINE_WAIT(myself);
netfs_stat(&netfs_n_rh_retry_read_req);
- set_bit(NETFS_RREQ_RETRYING, &rreq->flags); - /* Wait for all outstanding I/O to quiesce before performing retries as * we may need to renegotiate the I/O sizes. */ - list_for_each_entry(subreq, &stream->subrequests, rreq_link) { - if (!test_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags)) - continue; - - trace_netfs_rreq(rreq, netfs_rreq_trace_wait_queue); - for (;;) { - prepare_to_wait(&rreq->waitq, &myself, TASK_UNINTERRUPTIBLE); - - if (!test_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags)) - break; - - trace_netfs_sreq(subreq, netfs_sreq_trace_wait_for); - schedule(); - trace_netfs_rreq(rreq, netfs_rreq_trace_woke_queue); - } - - finish_wait(&rreq->waitq, &myself); - } + set_bit(NETFS_RREQ_RETRYING, &rreq->flags); + netfs_wait_for_in_progress_stream(rreq, stream); clear_bit(NETFS_RREQ_RETRYING, &rreq->flags);
trace_netfs_rreq(rreq, netfs_rreq_trace_resubmit); diff --git a/fs/netfs/write_collect.c b/fs/netfs/write_collect.c index 7241d1fd2c14a..0ce7b53e7fe83 100644 --- a/fs/netfs/write_collect.c +++ b/fs/netfs/write_collect.c @@ -321,18 +321,14 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq)
if (notes & NEED_RETRY) goto need_retry; - if ((notes & MADE_PROGRESS) && test_bit(NETFS_RREQ_PAUSE, &wreq->flags)) { - trace_netfs_rreq(wreq, netfs_rreq_trace_unpause); - clear_bit_unlock(NETFS_RREQ_PAUSE, &wreq->flags); - smp_mb__after_atomic(); /* Set PAUSE before task state */ - wake_up(&wreq->waitq); - }
- if (notes & NEED_REASSESS) { + if (notes & MADE_PROGRESS) { + netfs_wake_rreq_flag(wreq, NETFS_RREQ_PAUSE, netfs_rreq_trace_unpause); //cond_resched(); goto reassess_streams; } - if (notes & MADE_PROGRESS) { + + if (notes & NEED_REASSESS) { //cond_resched(); goto reassess_streams; } @@ -356,7 +352,7 @@ static void netfs_collect_write_results(struct netfs_io_request *wreq) /* * Perform the collection of subrequests, folios and encryption buffers. */ -static bool netfs_write_collection(struct netfs_io_request *wreq) +bool netfs_write_collection(struct netfs_io_request *wreq) { struct netfs_inode *ictx = netfs_inode(wreq->inode); size_t transferred; @@ -417,8 +413,7 @@ static bool netfs_write_collection(struct netfs_io_request *wreq) inode_dio_end(wreq->inode);
_debug("finished"); - trace_netfs_rreq(wreq, netfs_rreq_trace_wake_ip); - clear_and_wake_up_bit(NETFS_RREQ_IN_PROGRESS, &wreq->flags); + netfs_wake_rreq_flag(wreq, NETFS_RREQ_IN_PROGRESS, netfs_rreq_trace_wake_ip); /* As we cleared NETFS_RREQ_IN_PROGRESS, we acquired its ref. */
if (wreq->iocb) { @@ -448,14 +443,6 @@ void netfs_write_collection_worker(struct work_struct *work) } }
-/* - * Wake the collection work item. - */ -void netfs_wake_write_collector(struct netfs_io_request *wreq) -{ - queue_work(system_unbound_wq, &wreq->work); -} - /** * netfs_write_subrequest_terminated - Note the termination of a write operation. * @_op: The I/O request that has terminated. @@ -479,7 +466,6 @@ void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error) { struct netfs_io_subrequest *subreq = _op; struct netfs_io_request *wreq = subreq->rreq; - struct netfs_io_stream *stream = &wreq->io_streams[subreq->stream_nr];
_enter("%x[%x] %zd", wreq->debug_id, subreq->debug_index, transferred_or_error);
@@ -531,15 +517,7 @@ void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error) }
trace_netfs_sreq(subreq, netfs_sreq_trace_terminated); - - clear_and_wake_up_bit(NETFS_SREQ_IN_PROGRESS, &subreq->flags); - - /* If we are at the head of the queue, wake up the collector, - * transferring a ref to it if we were the ones to do so. - */ - if (list_is_first(&subreq->rreq_link, &stream->subrequests)) - netfs_wake_write_collector(wreq); - + netfs_subreq_clear_in_progress(subreq); netfs_put_subrequest(subreq, netfs_sreq_trace_put_terminated); } EXPORT_SYMBOL(netfs_write_subrequest_terminated); diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c index 8744ed3faf29b..50bee2c4130d1 100644 --- a/fs/netfs/write_issue.c +++ b/fs/netfs/write_issue.c @@ -542,7 +542,7 @@ static void netfs_end_issue_write(struct netfs_io_request *wreq) }
if (needs_poke) - netfs_wake_write_collector(wreq); + netfs_wake_collector(wreq); }
/* @@ -576,6 +576,7 @@ int netfs_writepages(struct address_space *mapping, goto couldnt_start; }
+ __set_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &wreq->flags); trace_netfs_write(wreq, netfs_write_trace_writeback); netfs_stat(&netfs_n_wh_writepages);
@@ -599,7 +600,7 @@ int netfs_writepages(struct address_space *mapping, netfs_end_issue_write(wreq);
mutex_unlock(&ictx->wb_lock); - netfs_wake_write_collector(wreq); + netfs_wake_collector(wreq);
netfs_put_request(wreq, netfs_rreq_trace_put_return); _leave(" = %d", error); @@ -674,11 +675,11 @@ int netfs_advance_writethrough(struct netfs_io_request *wreq, struct writeback_c /* * End a write operation used when writing through the pagecache. */ -int netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, - struct folio *writethrough_cache) +ssize_t netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_control *wbc, + struct folio *writethrough_cache) { struct netfs_inode *ictx = netfs_inode(wreq->inode); - int ret; + ssize_t ret;
_enter("R=%x", wreq->debug_id);
@@ -689,12 +690,10 @@ int netfs_end_writethrough(struct netfs_io_request *wreq, struct writeback_contr
mutex_unlock(&ictx->wb_lock);
- if (wreq->iocb) { + if (wreq->iocb) ret = -EIOCBQUEUED; - } else { - wait_on_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS, TASK_UNINTERRUPTIBLE); - ret = wreq->error; - } + else + ret = netfs_wait_for_write(wreq); netfs_put_request(wreq, netfs_rreq_trace_put_return); return ret; } @@ -723,10 +722,8 @@ int netfs_unbuffered_write(struct netfs_io_request *wreq, bool may_wait, size_t start += part; len -= part; rolling_buffer_advance(&wreq->buffer, part); - if (test_bit(NETFS_RREQ_PAUSE, &wreq->flags)) { - trace_netfs_rreq(wreq, netfs_rreq_trace_wait_pause); - wait_event(wreq->waitq, !test_bit(NETFS_RREQ_PAUSE, &wreq->flags)); - } + if (test_bit(NETFS_RREQ_PAUSE, &wreq->flags)) + netfs_wait_for_paused_write(wreq); if (test_bit(NETFS_RREQ_FAILED, &wreq->flags)) break; } @@ -886,6 +883,7 @@ int netfs_writeback_single(struct address_space *mapping, goto couldnt_start; }
+ __set_bit(NETFS_RREQ_OFFLOAD_COLLECTION, &wreq->flags); trace_netfs_write(wreq, netfs_write_trace_writeback_single); netfs_stat(&netfs_n_wh_writepages);
@@ -915,7 +913,7 @@ int netfs_writeback_single(struct address_space *mapping, set_bit(NETFS_RREQ_ALL_QUEUED, &wreq->flags);
mutex_unlock(&ictx->wb_lock); - netfs_wake_write_collector(wreq); + netfs_wake_collector(wreq);
netfs_put_request(wreq, netfs_rreq_trace_put_return); _leave(" = %d", ret); diff --git a/fs/netfs/write_retry.c b/fs/netfs/write_retry.c index 7408f6bb8e42e..9d1d8a8bab726 100644 --- a/fs/netfs/write_retry.c +++ b/fs/netfs/write_retry.c @@ -200,7 +200,6 @@ static void netfs_retry_write_stream(struct netfs_io_request *wreq, */ void netfs_retry_writes(struct netfs_io_request *wreq) { - struct netfs_io_subrequest *subreq; struct netfs_io_stream *stream; int s;
@@ -209,16 +208,13 @@ void netfs_retry_writes(struct netfs_io_request *wreq) /* Wait for all outstanding I/O to quiesce before performing retries as * we may need to renegotiate the I/O sizes. */ + set_bit(NETFS_RREQ_RETRYING, &wreq->flags); for (s = 0; s < NR_IO_STREAMS; s++) { stream = &wreq->io_streams[s]; - if (!stream->active) - continue; - - list_for_each_entry(subreq, &stream->subrequests, rreq_link) { - wait_on_bit(&subreq->flags, NETFS_SREQ_IN_PROGRESS, - TASK_UNINTERRUPTIBLE); - } + if (stream->active) + netfs_wait_for_in_progress_stream(wreq, stream); } + clear_bit(NETFS_RREQ_RETRYING, &wreq->flags);
// TODO: Enc: Fetch changed partial pages // TODO: Enc: Reencrypt content if needed.