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authorSteve French <smfrench@gmail.com>2017-05-04 15:54:04 +0300
committerSteve French <smfrench@gmail.com>2017-05-10 04:37:32 +0300
commitde1892b887eeb85ce458a93979c2108e6f329618 (patch)
tree661369262e31859faf6f507586259627ca159952 /fs
parent560d388950ceda5e7c7cdef7f3d9a8ff297bbf9d (diff)
downloadlinux-de1892b887eeb85ce458a93979c2108e6f329618.tar.xz
Don't delay freeing mids when blocked on slow socket write of request
When processing responses, and in particular freeing mids (DeleteMidQEntry), which is very important since it also frees the associated buffers (cifs_buf_release), we can block a long time if (writes to) socket is slow due to low memory or networking issues. We can block in send (smb request) waiting for memory, and be blocked in processing responess (which could free memory if we let it) - since they both grab the server->srv_mutex. In practice, in the DeleteMidQEntry case - there is no reason we need to grab the srv_mutex so remove these around DeleteMidQEntry, and it allows us to free memory faster. Signed-off-by: Steve French <steve.french@primarydata.com> Acked-by: Pavel Shilovsky <pshilov@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifssmb.c7
-rw-r--r--fs/cifs/smb2pdu.c7
-rw-r--r--fs/cifs/transport.c2
3 files changed, 0 insertions, 16 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 4c01b3f9abf0..4de3186d8a71 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -697,9 +697,7 @@ cifs_echo_callback(struct mid_q_entry *mid)
{
struct TCP_Server_Info *server = mid->callback_data;
- mutex_lock(&server->srv_mutex);
DeleteMidQEntry(mid);
- mutex_unlock(&server->srv_mutex);
add_credits(server, 1, CIFS_ECHO_OP);
}
@@ -1599,9 +1597,7 @@ cifs_readv_callback(struct mid_q_entry *mid)
}
queue_work(cifsiod_wq, &rdata->work);
- mutex_lock(&server->srv_mutex);
DeleteMidQEntry(mid);
- mutex_unlock(&server->srv_mutex);
add_credits(server, 1, 0);
}
@@ -2058,7 +2054,6 @@ cifs_writev_callback(struct mid_q_entry *mid)
{
struct cifs_writedata *wdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
- struct TCP_Server_Info *server = tcon->ses->server;
unsigned int written;
WRITE_RSP *smb = (WRITE_RSP *)mid->resp_buf;
@@ -2095,9 +2090,7 @@ cifs_writev_callback(struct mid_q_entry *mid)
}
queue_work(cifsiod_wq, &wdata->work);
- mutex_lock(&server->srv_mutex);
DeleteMidQEntry(mid);
- mutex_unlock(&server->srv_mutex);
add_credits(tcon->ses->server, 1, 0);
}
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 48ff7703b919..e0517f499c38 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -2173,9 +2173,7 @@ smb2_echo_callback(struct mid_q_entry *mid)
if (mid->mid_state == MID_RESPONSE_RECEIVED)
credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
- mutex_lock(&server->srv_mutex);
DeleteMidQEntry(mid);
- mutex_unlock(&server->srv_mutex);
add_credits(server, credits_received, CIFS_ECHO_OP);
}
@@ -2433,9 +2431,7 @@ smb2_readv_callback(struct mid_q_entry *mid)
cifs_stats_fail_inc(tcon, SMB2_READ_HE);
queue_work(cifsiod_wq, &rdata->work);
- mutex_lock(&server->srv_mutex);
DeleteMidQEntry(mid);
- mutex_unlock(&server->srv_mutex);
add_credits(server, credits_received, 0);
}
@@ -2594,7 +2590,6 @@ smb2_writev_callback(struct mid_q_entry *mid)
{
struct cifs_writedata *wdata = mid->callback_data;
struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
- struct TCP_Server_Info *server = tcon->ses->server;
unsigned int written;
struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
unsigned int credits_received = 1;
@@ -2634,9 +2629,7 @@ smb2_writev_callback(struct mid_q_entry *mid)
cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
queue_work(cifsiod_wq, &wdata->work);
- mutex_lock(&server->srv_mutex);
DeleteMidQEntry(mid);
- mutex_unlock(&server->srv_mutex);
add_credits(tcon->ses->server, credits_received, 0);
}
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 4d64b5b8fc9c..de589d0d3739 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -613,9 +613,7 @@ cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
}
spin_unlock(&GlobalMid_Lock);
- mutex_lock(&server->srv_mutex);
DeleteMidQEntry(mid);
- mutex_unlock(&server->srv_mutex);
return rc;
}