This is a note to let you know that I've just added the patch titled
CIFS: Fix missing lease break
to the 3.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cifs-fix-missing-lease-break.patch
and it can be found in the queue-3.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 933d4b36576c951d0371bbfed05ec0135d516a6e Mon Sep 17 00:00:00 2001
From: Pavel Shilovsky <pshilovsky@xxxxxxxxx>
Date: Thu, 5 Sep 2013 15:00:07 +0400
Subject: CIFS: Fix missing lease break
From: Pavel Shilovsky <pshilovsky@xxxxxxxxx>
commit 933d4b36576c951d0371bbfed05ec0135d516a6e upstream.
If a server sends a lease break to a connection that doesn't have
opens with a lease key specified in the server response, we can't
find an open file to send an ack. Fix this by walking through
all connections we have.
Signed-off-by: Pavel Shilovsky <pshilovsky@xxxxxxxxx>
Signed-off-by: Steve French <smfrench@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/cifs/smb2misc.c | 149 ++++++++++++++++++++++++++++-------------------------
1 file changed, 80 insertions(+), 69 deletions(-)
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -417,19 +417,76 @@ cifs_ses_oplock_break(struct work_struct
}
static bool
-smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
+smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
+ struct smb2_lease_break_work *lw)
+{
+ bool found;
+ __u8 lease_state;
+ struct list_head *tmp;
+ struct cifsFileInfo *cfile;
+ struct cifs_pending_open *open;
+ struct cifsInodeInfo *cinode;
+ int ack_req = le32_to_cpu(rsp->Flags &
+ SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
+
+ lease_state = smb2_map_lease_to_oplock(rsp->NewLeaseState);
+
+ list_for_each(tmp, &tcon->openFileList) {
+ cfile = list_entry(tmp, struct cifsFileInfo, tlist);
+ cinode = CIFS_I(cfile->dentry->d_inode);
+
+ if (memcmp(cinode->lease_key, rsp->LeaseKey,
+ SMB2_LEASE_KEY_SIZE))
+ continue;
+
+ cifs_dbg(FYI, "found in the open list\n");
+ cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
+ le32_to_cpu(rsp->NewLeaseState));
+
+ smb2_set_oplock_level(cinode, lease_state);
+
+ if (ack_req)
+ cfile->oplock_break_cancelled = false;
+ else
+ cfile->oplock_break_cancelled = true;
+
+ queue_work(cifsiod_wq, &cfile->oplock_break);
+ kfree(lw);
+ return true;
+ }
+
+ found = false;
+ list_for_each_entry(open, &tcon->pending_opens, olist) {
+ if (memcmp(open->lease_key, rsp->LeaseKey,
+ SMB2_LEASE_KEY_SIZE))
+ continue;
+
+ if (!found && ack_req) {
+ found = true;
+ memcpy(lw->lease_key, open->lease_key,
+ SMB2_LEASE_KEY_SIZE);
+ lw->tlink = cifs_get_tlink(open->tlink);
+ queue_work(cifsiod_wq, &lw->lease_break);
+ }
+
+ cifs_dbg(FYI, "found in the pending open list\n");
+ cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
+ le32_to_cpu(rsp->NewLeaseState));
+
+ open->oplock = lease_state;
+ }
+ return found;
+}
+
+static bool
+smb2_is_valid_lease_break(char *buffer)
{
struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
struct list_head *tmp, *tmp1, *tmp2;
+ struct TCP_Server_Info *server;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
- struct cifsInodeInfo *cinode;
- struct cifsFileInfo *cfile;
- struct cifs_pending_open *open;
struct smb2_lease_break_work *lw;
- bool found;
- int ack_req = le32_to_cpu(rsp->Flags &
- SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
if (!lw)
@@ -442,72 +499,26 @@ smb2_is_valid_lease_break(char *buffer,
/* look up tcon based on tid & uid */
spin_lock(&cifs_tcp_ses_lock);
- list_for_each(tmp, &server->smb_ses_list) {
- ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
+ list_for_each(tmp, &cifs_tcp_ses_list) {
+ server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
- spin_lock(&cifs_file_list_lock);
- list_for_each(tmp1, &ses->tcon_list) {
- tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
-
- cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
- list_for_each(tmp2, &tcon->openFileList) {
- cfile = list_entry(tmp2, struct cifsFileInfo,
- tlist);
- cinode = CIFS_I(cfile->dentry->d_inode);
-
- if (memcmp(cinode->lease_key, rsp->LeaseKey,
- SMB2_LEASE_KEY_SIZE))
- continue;
-
- cifs_dbg(FYI, "found in the open list\n");
- cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
- le32_to_cpu(rsp->NewLeaseState));
-
- smb2_set_oplock_level(cinode,
- smb2_map_lease_to_oplock(rsp->NewLeaseState));
-
- if (ack_req)
- cfile->oplock_break_cancelled = false;
- else
- cfile->oplock_break_cancelled = true;
-
- queue_work(cifsiod_wq, &cfile->oplock_break);
-
- kfree(lw);
- spin_unlock(&cifs_file_list_lock);
- spin_unlock(&cifs_tcp_ses_lock);
- return true;
- }
+ list_for_each(tmp1, &server->smb_ses_list) {
+ ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
- found = false;
- list_for_each_entry(open, &tcon->pending_opens, olist) {
- if (memcmp(open->lease_key, rsp->LeaseKey,
- SMB2_LEASE_KEY_SIZE))
- continue;
-
- if (!found && ack_req) {
- found = true;
- memcpy(lw->lease_key, open->lease_key,
- SMB2_LEASE_KEY_SIZE);
- lw->tlink = cifs_get_tlink(open->tlink);
- queue_work(cifsiod_wq,
- &lw->lease_break);
+ spin_lock(&cifs_file_list_lock);
+ list_for_each(tmp2, &ses->tcon_list) {
+ tcon = list_entry(tmp2, struct cifs_tcon,
+ tcon_list);
+ cifs_stats_inc(
+ &tcon->stats.cifs_stats.num_oplock_brks);
+ if (smb2_tcon_has_lease(tcon, rsp, lw)) {
+ spin_unlock(&cifs_file_list_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
+ return true;
}
-
- cifs_dbg(FYI, "found in the pending open list\n");
- cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
- le32_to_cpu(rsp->NewLeaseState));
-
- open->oplock =
- smb2_map_lease_to_oplock(rsp->NewLeaseState);
- }
- if (found) {
- spin_unlock(&cifs_file_list_lock);
- spin_unlock(&cifs_tcp_ses_lock);
- return true;
}
+ spin_unlock(&cifs_file_list_lock);
}
- spin_unlock(&cifs_file_list_lock);
}
spin_unlock(&cifs_tcp_ses_lock);
kfree(lw);
@@ -533,7 +544,7 @@ smb2_is_valid_oplock_break(char *buffer,
if (rsp->StructureSize !=
smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
if (le16_to_cpu(rsp->StructureSize) == 44)
- return smb2_is_valid_lease_break(buffer, server);
+ return smb2_is_valid_lease_break(buffer);
else
return false;
}
Patches currently in stable-queue which might be from pshilovsky@xxxxxxxxx are
queue-3.11/cifs-fix-a-memory-leak-when-a-lease-break-comes.patch
queue-3.11/cifs-fix-missing-lease-break.patch
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