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CIFS: Fix an issue with re-sending wdata when transport returning -EAGAIN 

When sending a wdata, transport may return -EAGAIN. In this case
we should re-obtain credits because the session may have been
reconnected.

Change in v2: adjust_credits before re-sending

Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
This commit is contained in:
Long Li 2019-03-15 07:54:59 +00:00 committed by Steve French
parent a5ed1e96ca
commit d53e292f0f
1 changed files with 47 additions and 34 deletions
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81
fs/cifs/file.c
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@ -2632,43 +2632,56 @@ cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
struct TCP_Server_Info *server =
tlink_tcon(wdata->cfile->tlink)->ses->server;
/*
* Wait for credits to resend this wdata.
* Note: we are attempting to resend the whole wdata not in segments
*/
do {
rc = server->ops->wait_mtu_credits(server, wdata->bytes, &wsize,
&credits);
if (rc)
goto out;
if (wsize < wdata->bytes) {
add_credits_and_wake_if(server, &credits, 0);
msleep(1000);
}
} while (wsize < wdata->bytes);
wdata->credits = credits;
rc = -EAGAIN;
while (rc == -EAGAIN) {
rc = 0;
if (wdata->cfile->invalidHandle)
if (wdata->cfile->invalidHandle) {
rc = cifs_reopen_file(wdata->cfile, false);
if (!rc)
rc = server->ops->async_writev(wdata,
if (rc == -EAGAIN)
continue;
else if (rc)
break;
}
/*
* Wait for credits to resend this wdata.
* Note: we are attempting to resend the whole wdata not in
* segments
*/
do {
rc = server->ops->wait_mtu_credits(server, wdata->bytes,
&wsize, &credits);
if (rc)
goto fail;
if (wsize < wdata->bytes) {
add_credits_and_wake_if(server, &credits, 0);
msleep(1000);
}
} while (wsize < wdata->bytes);
wdata->credits = credits;
rc = adjust_credits(server, &wdata->credits, wdata->bytes);
if (!rc) {
if (wdata->cfile->invalidHandle)
rc = -EAGAIN;
else
rc = server->ops->async_writev(wdata,
cifs_uncached_writedata_release);
}
}
if (!rc) {
list_add_tail(&wdata->list, wdata_list);
return 0;
}
/* If the write was successfully sent, we are done */
if (!rc) {
list_add_tail(&wdata->list, wdata_list);
return 0;
}
add_credits_and_wake_if(server, &wdata->credits, 0);
out:
/* Roll back credits and retry if needed */
add_credits_and_wake_if(server, &wdata->credits, 0);
} while (rc == -EAGAIN);
fail:
kref_put(&wdata->refcount, cifs_uncached_writedata_release);
return rc;
}
@ -2896,12 +2909,12 @@ restart_loop:
wdata->bytes, &tmp_from,
ctx->cfile, cifs_sb, &tmp_list,
ctx);
kref_put(&wdata->refcount,
cifs_uncached_writedata_release);
}
list_splice(&tmp_list, &ctx->list);
kref_put(&wdata->refcount,
cifs_uncached_writedata_release);
goto restart_loop;
}
}