[PATCH v5 08/32] netfs: Drop the error arg from netfs_read_subreq_terminated()

David Howells
2024-12-16T20:42:41Z

Drop the error argument from netfs_read_subreq_terminated() in favour of
passing the value in subreq->error.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
---
fs/9p/vfs_addr.c | 3 ++-
fs/afs/file.c | 15 ++++++++-----
fs/ceph/addr.c | 13 +++++++----
fs/netfs/buffered_read.c | 16 +++++++-------
fs/netfs/objects.c | 15 ++++++++++++-
fs/netfs/read_collect.c | 47 +++++++++++++++++++++++++---------------
fs/nfs/fscache.c | 6 +++--
fs/nfs/fscache.h | 3 ++-
fs/smb/client/cifssmb.c | 10 +--------
fs/smb/client/file.c | 3 ++-
fs/smb/client/smb2pdu.c | 10 +--------
include/linux/netfs.h | 7 +++---
12 files changed, 86 insertions(+), 62 deletions(-)

diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 3bc9ce6c575e..40f5acd7b452 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -87,7 +87,8 @@ static void v9fs_issue_read(struct netfs_io_subrequest *subreq)
__set_bit(NETFS_SREQ_MADE_PROGRESS, &subreq->flags);
}

- netfs_read_subreq_terminated(subreq, err, false);
+ subreq->error = err;
+ netfs_read_subreq_terminated(subreq, false);
}

/**
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 6762eff97517..56248a078bca 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -246,7 +246,8 @@ static void afs_fetch_data_notify(struct afs_operation *op)
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);
+ subreq->error = error;
+ netfs_read_subreq_terminated(subreq, false);
req->subreq = NULL;
} else if (req->done) {
req->done(req);
@@ -301,8 +302,10 @@ 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_read_subreq_terminated(req->subreq, PTR_ERR(op), false);
+ if (req->subreq) {
+ req->subreq->error = PTR_ERR(op);
+ netfs_read_subreq_terminated(req->subreq, false);
+ }
return PTR_ERR(op);
}

@@ -320,8 +323,10 @@ static void afs_read_worker(struct work_struct *work)
struct afs_read *fsreq;

fsreq = afs_alloc_read(GFP_NOFS);
- if (!fsreq)
- return netfs_read_subreq_terminated(subreq, -ENOMEM, false);
+ if (!fsreq) {
+ subreq->error = -ENOMEM;
+ return netfs_read_subreq_terminated(subreq, false);
+ }

fsreq->subreq = subreq;
fsreq->pos = subreq->start + subreq->transferred;
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 85936f6d2bf7..b1b47af94deb 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -253,8 +253,9 @@ static void finish_netfs_read(struct ceph_osd_request *req)
subreq->transferred = err;
err = 0;
}
+ subreq->error = err;
trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress);
- netfs_read_subreq_terminated(subreq, err, false);
+ netfs_read_subreq_terminated(subreq, false);
iput(req->r_inode);
ceph_dec_osd_stopping_blocker(fsc->mdsc);
}
@@ -314,7 +315,9 @@ static bool ceph_netfs_issue_op_inline(struct netfs_io_subrequest *subreq)

ceph_mdsc_put_request(req);
out:
- netfs_read_subreq_terminated(subreq, err, false);
+ subreq->error = err;
+ trace_netfs_sreq(subreq, netfs_sreq_trace_io_progress);
+ netfs_read_subreq_terminated(subreq, false);
return true;
}

@@ -426,8 +429,10 @@ static void ceph_netfs_issue_read(struct netfs_io_subrequest *subreq)
ceph_osdc_start_request(req->r_osdc, req);
out:
ceph_osdc_put_request(req);
- if (err)
- netfs_read_subreq_terminated(subreq, err, false);
+ if (err) {
+ subreq->error = err;
+ netfs_read_subreq_terminated(subreq, false);
+ }
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 db874fea8794..d420d623711c 100644
--- a/fs/netfs/buffered_read.c
+++ b/fs/netfs/buffered_read.c
@@ -148,14 +148,13 @@ static void netfs_cache_read_terminated(void *priv, ssize_t transferred_or_error
{
struct netfs_io_subrequest *subreq = priv;

- if (transferred_or_error < 0) {
- netfs_read_subreq_terminated(subreq, transferred_or_error, was_async);
- return;
- }
-
- if (transferred_or_error > 0)
+ if (transferred_or_error > 0) {
subreq->transferred += transferred_or_error;
- netfs_read_subreq_terminated(subreq, 0, was_async);
+ subreq->error = 0;
+ } else {
+ subreq->error = transferred_or_error;
+ }
+ netfs_read_subreq_terminated(subreq, was_async);
}

/*
@@ -255,7 +254,8 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq)
if (slice < 0)
goto prep_iter_failed;
__set_bit(NETFS_SREQ_CLEAR_TAIL, &subreq->flags);
- netfs_read_subreq_terminated(subreq, 0, false);
+ subreq->error = 0;
+ netfs_read_subreq_terminated(subreq, false);
goto done;
}

diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c
index 5cdddaf1f978..f10fd56efa17 100644
--- a/fs/netfs/objects.c
+++ b/fs/netfs/objects.c
@@ -191,7 +191,20 @@ struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq
}

memset(subreq, 0, kmem_cache_size(cache));
- INIT_WORK(&subreq->work, NULL);
+
+ switch (rreq->origin) {
+ case NETFS_READAHEAD:
+ case NETFS_READPAGE:
+ case NETFS_READ_GAPS:
+ case NETFS_READ_FOR_WRITE:
+ case NETFS_DIO_READ:
+ INIT_WORK(&subreq->work, netfs_read_subreq_termination_worker);
+ break;
+ default:
+ INIT_WORK(&subreq->work, NULL);
+ break;
+ }
+
INIT_LIST_HEAD(&subreq->rreq_link);
refcount_set(&subreq->ref, 2);
subreq->rreq = rreq;
diff --git a/fs/netfs/read_collect.c b/fs/netfs/read_collect.c
index f7a5cb29dd12..16770a317b22 100644
--- a/fs/netfs/read_collect.c
+++ b/fs/netfs/read_collect.c
@@ -452,28 +452,26 @@ 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
+ * @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.
*
- * 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.
+ * The caller indicates the outcome of the operation through @subreq->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)
+void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq, bool was_async)
{
struct netfs_io_request *rreq = subreq->rreq;

+ might_sleep();
+
switch (subreq->source) {
case NETFS_READ_FROM_CACHE:
netfs_stat(&netfs_n_rh_read_done);
@@ -491,7 +489,7 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq,
* 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 &&
+ if (subreq->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);
@@ -511,7 +509,7 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq,
/* 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 (!subreq->error && subreq->transferred < subreq->len) {
if (test_bit(NETFS_SREQ_HIT_EOF, &subreq->flags)) {
trace_netfs_sreq(subreq, netfs_sreq_trace_hit_eof);
} else {
@@ -528,16 +526,15 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq,
set_bit(NETFS_RREQ_NEED_RETRY, &rreq->flags);
} else {
__set_bit(NETFS_SREQ_FAILED, &subreq->flags);
- error = -ENODATA;
+ subreq->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 (unlikely(subreq->error < 0)) {
+ trace_netfs_failure(rreq, subreq, subreq->error, netfs_fail_read);
if (subreq->source == NETFS_READ_FROM_CACHE) {
netfs_stat(&netfs_n_rh_read_failed);
} else {
@@ -553,3 +550,19 @@ void netfs_read_subreq_terminated(struct netfs_io_subrequest *subreq,
netfs_put_subrequest(subreq, was_async, netfs_sreq_trace_put_terminated);
}
EXPORT_SYMBOL(netfs_read_subreq_terminated);
+
+/**
+ * netfs_read_subreq_termination_worker - Workqueue helper for read termination
+ * @work: The subreq->work in the I/O request that has been terminated.
+ *
+ * Helper function to jump to netfs_read_subreq_terminated() from the
+ * subrequest work item.
+ */
+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);
+}
+EXPORT_SYMBOL(netfs_read_subreq_termination_worker);
diff --git a/fs/nfs/fscache.c b/fs/nfs/fscache.c
index d49e4ce27999..be14d30608f6 100644
--- a/fs/nfs/fscache.c
+++ b/fs/nfs/fscache.c
@@ -314,8 +314,10 @@ static void nfs_netfs_issue_read(struct netfs_io_subrequest *sreq)
&nfs_async_read_completion_ops);

netfs = nfs_netfs_alloc(sreq);
- if (!netfs)
- return netfs_read_subreq_terminated(sreq, -ENOMEM, false);
+ if (!netfs) {
+ sreq->error = -ENOMEM;
+ return netfs_read_subreq_terminated(sreq, false);
+ }

pgio.pg_netfs = netfs; /* used in completion */

diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index 772d485e96d3..1d86f7cc7195 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h
@@ -74,7 +74,8 @@ 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_read_subreq_terminated(netfs->sreq, netfs->error, false);
+ netfs->sreq->error = netfs->error;
+ netfs_read_subreq_terminated(netfs->sreq, false);
kfree(netfs);
}
static inline void nfs_netfs_inode_init(struct nfs_inode *nfsi)
diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c
index 6cb1e81993f8..7c9cc6945d18 100644
--- a/fs/smb/client/cifssmb.c
+++ b/fs/smb/client/cifssmb.c
@@ -1258,14 +1258,6 @@ CIFS_open(const unsigned int xid, struct cifs_open_parms *oparms, int *oplock,
return rc;
}

-static void cifs_readv_worker(struct work_struct *work)
-{
- struct cifs_io_subrequest *rdata =
- container_of(work, struct cifs_io_subrequest, subreq.work);
-
- netfs_read_subreq_terminated(&rdata->subreq, rdata->result, false);
-}
-
static void
cifs_readv_callback(struct mid_q_entry *mid)
{
@@ -1333,8 +1325,8 @@ cifs_readv_callback(struct mid_q_entry *mid)
}

rdata->credits.value = 0;
+ rdata->subreq.error = rdata->result;
rdata->subreq.transferred += rdata->got_bytes;
- INIT_WORK(&rdata->subreq.work, cifs_readv_worker);
queue_work(cifsiod_wq, &rdata->subreq.work);
release_mid(mid);
add_credits(server, &credits, 0);
diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c
index a58a3333ecc3..10dd440f8178 100644
--- a/fs/smb/client/file.c
+++ b/fs/smb/client/file.c
@@ -227,7 +227,8 @@ static void cifs_issue_read(struct netfs_io_subrequest *subreq)
return;

failed:
- netfs_read_subreq_terminated(subreq, rc, false);
+ subreq->error = rc;
+ netfs_read_subreq_terminated(subreq, false);
}

/*
diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c
index 458b53d1f9cb..ce57d8697c7c 100644
--- a/fs/smb/client/smb2pdu.c
+++ b/fs/smb/client/smb2pdu.c
@@ -4500,14 +4500,6 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
return rc;
}

-static void smb2_readv_worker(struct work_struct *work)
-{
- struct cifs_io_subrequest *rdata =
- container_of(work, struct cifs_io_subrequest, subreq.work);
-
- netfs_read_subreq_terminated(&rdata->subreq, rdata->result, false);
-}
-
static void
smb2_readv_callback(struct mid_q_entry *mid)
{
@@ -4621,9 +4613,9 @@ 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.error = rdata->result;
rdata->subreq.transferred += rdata->got_bytes;
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);
trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index bd922f0936e3..a882921460a9 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h
@@ -427,10 +427,9 @@ 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,
- int error, bool was_async);
+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_termination_worker(struct work_struct *work);
void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
enum netfs_sreq_ref_trace what);
void netfs_put_subrequest(struct netfs_io_subrequest *subreq,