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Date: Tue, 14 Oct 2008 20:41:03 -0400
From: Jeff Layton <jlayton@...hat.com>
To: smfrench@...il.com
Cc: smfrench@...tin.rr.com, linux-kernel@...r.kernel.org,
niallain@...il.com, linux-cifs-client@...ts.samba.org
Subject: [PATCH 1/5] cifs: disable sharing of server, session and tcon
The code that allows these structs to be shared is extremely racy.
Disable them for now until we can come up with a way to do this that's
race free.
Note that this leaves a substantial amount of dead code in cifs_mount.
I'm leery of removing it at this point until we know for sure that we
aren't going to reuse it later.
Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
fs/cifs/connect.c | 105 -----------------------------------------------------
1 files changed, 0 insertions(+), 105 deletions(-)
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 4c13bcd..492d3a9 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1331,94 +1331,6 @@ cifs_parse_mount_options(char *options, const char *devname,
return 0;
}
-static struct cifsSesInfo *
-cifs_find_tcp_session(struct in_addr *target_ip_addr,
- struct in6_addr *target_ip6_addr,
- char *userName, struct TCP_Server_Info **psrvTcp)
-{
- struct list_head *tmp;
- struct cifsSesInfo *ses;
-
- *psrvTcp = NULL;
-
- read_lock(&GlobalSMBSeslock);
- list_for_each(tmp, &GlobalSMBSessionList) {
- ses = list_entry(tmp, struct cifsSesInfo, cifsSessionList);
- if (!ses->server)
- continue;
-
- if (target_ip_addr &&
- ses->server->addr.sockAddr.sin_addr.s_addr != target_ip_addr->s_addr)
- continue;
- else if (target_ip6_addr &&
- memcmp(&ses->server->addr.sockAddr6.sin6_addr,
- target_ip6_addr, sizeof(*target_ip6_addr)))
- continue;
- /* BB lock server and tcp session; increment use count here?? */
-
- /* found a match on the TCP session */
- *psrvTcp = ses->server;
-
- /* BB check if reconnection needed */
- if (strncmp(ses->userName, userName, MAX_USERNAME_SIZE) == 0) {
- read_unlock(&GlobalSMBSeslock);
- /* Found exact match on both TCP and
- SMB sessions */
- return ses;
- }
- /* else tcp and smb sessions need reconnection */
- }
- read_unlock(&GlobalSMBSeslock);
-
- return NULL;
-}
-
-static struct cifsTconInfo *
-find_unc(__be32 new_target_ip_addr, char *uncName, char *userName)
-{
- struct list_head *tmp;
- struct cifsTconInfo *tcon;
- __be32 old_ip;
-
- read_lock(&GlobalSMBSeslock);
-
- list_for_each(tmp, &GlobalTreeConnectionList) {
- cFYI(1, ("Next tcon"));
- tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
- if (!tcon->ses || !tcon->ses->server)
- continue;
-
- old_ip = tcon->ses->server->addr.sockAddr.sin_addr.s_addr;
- cFYI(1, ("old ip addr: %x == new ip %x ?",
- old_ip, new_target_ip_addr));
-
- if (old_ip != new_target_ip_addr)
- continue;
-
- /* BB lock tcon, server, tcp session and increment use count? */
- /* found a match on the TCP session */
- /* BB check if reconnection needed */
- cFYI(1, ("IP match, old UNC: %s new: %s",
- tcon->treeName, uncName));
-
- if (strncmp(tcon->treeName, uncName, MAX_TREE_SIZE))
- continue;
-
- cFYI(1, ("and old usr: %s new: %s",
- tcon->treeName, uncName));
-
- if (strncmp(tcon->ses->userName, userName, MAX_USERNAME_SIZE))
- continue;
-
- /* matched smb session (user name) */
- read_unlock(&GlobalSMBSeslock);
- return tcon;
- }
-
- read_unlock(&GlobalSMBSeslock);
- return NULL;
-}
-
int
get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
@@ -1936,20 +1848,6 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
}
}
- if (address_type == AF_INET)
- existingCifsSes = cifs_find_tcp_session(&sin_server.sin_addr,
- NULL /* no ipv6 addr */,
- volume_info.username, &srvTcp);
- else if (address_type == AF_INET6) {
- cFYI(1, ("looking for ipv6 address"));
- existingCifsSes = cifs_find_tcp_session(NULL /* no ipv4 addr */,
- &sin_server6.sin6_addr,
- volume_info.username, &srvTcp);
- } else {
- rc = -EINVAL;
- goto out;
- }
-
if (srvTcp) {
cFYI(1, ("Existing tcp session with server found"));
} else { /* create socket */
@@ -2155,9 +2053,6 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
cERROR(1, ("mount option dynperm ignored if cifsacl "
"mount option supported"));
- tcon =
- find_unc(sin_server.sin_addr.s_addr, volume_info.UNC,
- volume_info.username);
if (tcon) {
cFYI(1, ("Found match on UNC path"));
/* we can have only one retry value for a connection
--
1.5.5.1
--
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