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CIFS: Avoid returning EBUSY to upper layer VFS

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EBUSY is not handled by VFS, and will be passed to user-mode. This is not
correct as we need to wait for more credits.

This patch also fixes a bug where rsize or wsize is used uninitialized when
the call to server->ops->wait_mtu_credits() fails.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
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 2018-12-06 04:51:06 +00:00 committed by Steve French
parent c988de29ca
commit 6ac79291fb
1 changed files with 6 additions and 25 deletions
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31
fs/cifs/file.c
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@ -2541,14 +2541,13 @@ static int
cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
struct cifs_aio_ctx *ctx)
{
int wait_retry = 0;
unsigned int wsize, credits;
int rc;
struct TCP_Server_Info *server =
tlink_tcon(wdata->cfile->tlink)->ses->server;
/*
* Try to resend this wdata, waiting for credits up to 3 seconds.
* Wait for credits to resend this wdata.
* Note: we are attempting to resend the whole wdata not in segments
*/
do {
@ -2556,19 +2555,13 @@ cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list,
server, wdata->bytes, &wsize, &credits);
if (rc)
break;
goto out;
if (wsize < wdata->bytes) {
add_credits_and_wake_if(server, credits, 0);
msleep(1000);
wait_retry++;
}
} while (wsize < wdata->bytes && wait_retry < 3);
if (wsize < wdata->bytes) {
rc = -EBUSY;
goto out;
}
} while (wsize < wdata->bytes);
rc = -EAGAIN;
while (rc == -EAGAIN) {
@ -3234,14 +3227,13 @@ static int cifs_resend_rdata(struct cifs_readdata *rdata,
struct list_head *rdata_list,
struct cifs_aio_ctx *ctx)
{
int wait_retry = 0;
unsigned int rsize, credits;
int rc;
struct TCP_Server_Info *server =
tlink_tcon(rdata->cfile->tlink)->ses->server;
/*
* Try to resend this rdata, waiting for credits up to 3 seconds.
* Wait for credits to resend this rdata.
* Note: we are attempting to resend the whole rdata not in segments
*/
do {
@ -3249,24 +3241,13 @@ static int cifs_resend_rdata(struct cifs_readdata *rdata,
&rsize, &credits);
if (rc)
break;
goto out;
if (rsize < rdata->bytes) {
add_credits_and_wake_if(server, credits, 0);
msleep(1000);
wait_retry++;
}
} while (rsize < rdata->bytes && wait_retry < 3);
/*
* If we can't find enough credits to send this rdata
* release the rdata and return failure, this will pass
* whatever I/O amount we have finished to VFS.
*/
if (rsize < rdata->bytes) {
rc = -EBUSY;
goto out;
}
} while (rsize < rdata->bytes);
rc = -EAGAIN;
while (rc == -EAGAIN) {