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cifs: Fix SMB1 readv/writev callback in the same way as SMB2/3

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Port a number of SMB2/3 async readv/writev fixes to the SMB1 transport:

    commit a88d609036
    cifs: Don't advance the I/O iterator before terminating subrequest

    commit ce5291e560
    cifs: Defer read completion

    commit 1da29f2c39
    netfs, cifs: Fix handling of short DIO read

Fixes: 3ee1a1fc39 ("cifs: Cut over to using netfslib")
Signed-off-by: David Howells <dhowells@redhat.com>
Reported-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Paulo Alcantara <pc@manguebit.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
David Howells 2024-09-03 11:15:41 +01:00 committed by Steve French
parent 517b58c1f9
commit a68c74865f
1 changed files with 46 additions and 8 deletions
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54
fs/smb/client/cifssmb.c
View file

@ -1261,16 +1261,32 @@ openRetry:
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_subreq_terminated(&rdata->subreq,
(rdata->result == 0 || rdata->result == -EAGAIN) ?
rdata->got_bytes : rdata->result, true);
}
static void
cifs_readv_callback(struct mid_q_entry *mid)
{
struct cifs_io_subrequest *rdata = mid->callback_data;
struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
struct TCP_Server_Info *server = tcon->ses->server;
struct smb_rqst rqst = { .rq_iov = rdata->iov,
.rq_nvec = 2,
.rq_iter = rdata->subreq.io_iter };
struct cifs_credits credits = { .value = 1, .instance = 0 };
struct cifs_credits credits = {
.value = 1,
.instance = 0,
.rreq_debug_id = rdata->rreq->debug_id,
.rreq_debug_index = rdata->subreq.debug_index,
};
cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu\n",
__func__, mid->mid, mid->mid_state, rdata->result,
@ -1282,6 +1298,7 @@ cifs_readv_callback(struct mid_q_entry *mid)
if (server->sign) {
int rc = 0;
iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
rc = cifs_verify_signature(&rqst, server,
mid->sequence_number);
if (rc)
@ -1306,13 +1323,21 @@ cifs_readv_callback(struct mid_q_entry *mid)
rdata->result = -EIO;
}
if (rdata->result == 0 || rdata->result == -EAGAIN)
iov_iter_advance(&rdata->subreq.io_iter, rdata->got_bytes);
if (rdata->result == -ENODATA) {
__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
rdata->result = 0;
} else {
if (rdata->got_bytes < rdata->actual_len &&
rdata->subreq.start + rdata->subreq.transferred + rdata->got_bytes ==
ictx->remote_i_size) {
__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
rdata->result = 0;
}
}
rdata->credits.value = 0;
netfs_subreq_terminated(&rdata->subreq,
(rdata->result == 0 || rdata->result == -EAGAIN) ?
rdata->got_bytes : rdata->result,
false);
INIT_WORK(&rdata->subreq.work, cifs_readv_worker);
queue_work(cifsiod_wq, &rdata->subreq.work);
release_mid(mid);
add_credits(server, &credits, 0);
}
@ -1619,9 +1644,15 @@ static void
cifs_writev_callback(struct mid_q_entry *mid)
{
struct cifs_io_subrequest *wdata = mid->callback_data;
struct TCP_Server_Info *server = wdata->server;
struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
WRITE_RSP *smb = (WRITE_RSP *)mid->resp_buf;
struct cifs_credits credits = { .value = 1, .instance = 0 };
struct cifs_credits credits = {
.value = 1,
.instance = 0,
.rreq_debug_id = wdata->rreq->debug_id,
.rreq_debug_index = wdata->subreq.debug_index,
};
ssize_t result;
size_t written;
@ -1657,9 +1688,16 @@ cifs_writev_callback(struct mid_q_entry *mid)
break;
}
trace_smb3_rw_credits(credits.rreq_debug_id, credits.rreq_debug_index,
wdata->credits.value,
server->credits, server->in_flight,
0, cifs_trace_rw_credits_write_response_clear);
wdata->credits.value = 0;
cifs_write_subrequest_terminated(wdata, result, true);
release_mid(mid);
trace_smb3_rw_credits(credits.rreq_debug_id, credits.rreq_debug_index, 0,
server->credits, server->in_flight,
credits.value, cifs_trace_rw_credits_write_response_add);
add_credits(tcon->ses->server, &credits, 0);
}