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Diffstat (limited to 'fs/smb/client/connect.c')
-rw-r--r--fs/smb/client/connect.c153
1 files changed, 98 insertions, 55 deletions
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index 9b85b5341822e7..85679ae106fd50 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -175,6 +175,8 @@ cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
+ if (cifs_ses_exiting(ses))
+ continue;
spin_lock(&ses->chan_lock);
for (i = 0; i < ses->chan_count; i++) {
if (!ses->chans[i].server)
@@ -232,7 +234,13 @@ cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
- /* check if iface is still active */
+ spin_lock(&ses->ses_lock);
+ if (ses->ses_status == SES_EXITING) {
+ spin_unlock(&ses->ses_lock);
+ continue;
+ }
+ spin_unlock(&ses->ses_lock);
+
spin_lock(&ses->chan_lock);
if (cifs_ses_get_chan_index(ses, server) ==
CIFS_INVAL_CHAN_INDEX) {
@@ -1860,6 +1868,9 @@ static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
ctx->sectype != ses->sectype)
return 0;
+ if (ctx->dfs_root_ses != ses->dfs_root_ses)
+ return 0;
+
/*
* If an existing session is limited to less channels than
* requested, it should not be reused
@@ -1963,31 +1974,6 @@ out:
return rc;
}
-/**
- * cifs_free_ipc - helper to release the session IPC tcon
- * @ses: smb session to unmount the IPC from
- *
- * Needs to be called everytime a session is destroyed.
- *
- * On session close, the IPC is closed and the server must release all tcons of the session.
- * No need to send a tree disconnect here.
- *
- * Besides, it will make the server to not close durable and resilient files on session close, as
- * specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
- */
-static int
-cifs_free_ipc(struct cifs_ses *ses)
-{
- struct cifs_tcon *tcon = ses->tcon_ipc;
-
- if (tcon == NULL)
- return 0;
-
- tconInfoFree(tcon);
- ses->tcon_ipc = NULL;
- return 0;
-}
-
static struct cifs_ses *
cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
{
@@ -2019,48 +2005,52 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
void __cifs_put_smb_ses(struct cifs_ses *ses)
{
struct TCP_Server_Info *server = ses->server;
+ struct cifs_tcon *tcon;
unsigned int xid;
size_t i;
+ bool do_logoff;
int rc;
+ spin_lock(&cifs_tcp_ses_lock);
spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_EXITING) {
+ cifs_dbg(FYI, "%s: id=0x%llx ses_count=%d ses_status=%u ipc=%s\n",
+ __func__, ses->Suid, ses->ses_count, ses->ses_status,
+ ses->tcon_ipc ? ses->tcon_ipc->tree_name : "none");
+ if (ses->ses_status == SES_EXITING || --ses->ses_count > 0) {
spin_unlock(&ses->ses_lock);
+ spin_unlock(&cifs_tcp_ses_lock);
return;
}
- spin_unlock(&ses->ses_lock);
+ /* ses_count can never go negative */
+ WARN_ON(ses->ses_count < 0);
- cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
- cifs_dbg(FYI,
- "%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->tree_name : "NONE");
+ spin_lock(&ses->chan_lock);
+ cifs_chan_clear_need_reconnect(ses, server);
+ spin_unlock(&ses->chan_lock);
- spin_lock(&cifs_tcp_ses_lock);
- if (--ses->ses_count > 0) {
- spin_unlock(&cifs_tcp_ses_lock);
- return;
- }
- spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_GOOD)
- ses->ses_status = SES_EXITING;
+ do_logoff = ses->ses_status == SES_GOOD && server->ops->logoff;
+ ses->ses_status = SES_EXITING;
+ tcon = ses->tcon_ipc;
+ ses->tcon_ipc = NULL;
spin_unlock(&ses->ses_lock);
spin_unlock(&cifs_tcp_ses_lock);
- /* ses_count can never go negative */
- WARN_ON(ses->ses_count < 0);
-
- spin_lock(&ses->ses_lock);
- if (ses->ses_status == SES_EXITING && server->ops->logoff) {
- spin_unlock(&ses->ses_lock);
- cifs_free_ipc(ses);
+ /*
+ * On session close, the IPC is closed and the server must release all
+ * tcons of the session. No need to send a tree disconnect here.
+ *
+ * Besides, it will make the server to not close durable and resilient
+ * files on session close, as specified in MS-SMB2 3.3.5.6 Receiving an
+ * SMB2 LOGOFF Request.
+ */
+ tconInfoFree(tcon);
+ if (do_logoff) {
xid = get_xid();
rc = server->ops->logoff(xid, ses);
if (rc)
cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
__func__, rc);
_free_xid(xid);
- } else {
- spin_unlock(&ses->ses_lock);
- cifs_free_ipc(ses);
}
spin_lock(&cifs_tcp_ses_lock);
@@ -2373,9 +2363,9 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
* need to lock before changing something in the session.
*/
spin_lock(&cifs_tcp_ses_lock);
+ if (ctx->dfs_root_ses)
+ cifs_smb_ses_inc_refcount(ctx->dfs_root_ses);
ses->dfs_root_ses = ctx->dfs_root_ses;
- if (ses->dfs_root_ses)
- ses->dfs_root_ses->ses_count++;
list_add(&ses->smb_ses_list, &server->smb_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
@@ -3326,6 +3316,9 @@ void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx)
cifs_put_smb_ses(mnt_ctx->ses);
else if (mnt_ctx->server)
cifs_put_tcp_session(mnt_ctx->server, 0);
+ mnt_ctx->ses = NULL;
+ mnt_ctx->tcon = NULL;
+ mnt_ctx->server = NULL;
mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
free_xid(mnt_ctx->xid);
}
@@ -3604,8 +3597,6 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
bool isdfs;
int rc;
- INIT_LIST_HEAD(&mnt_ctx.dfs_ses_list);
-
rc = dfs_mount_share(&mnt_ctx, &isdfs);
if (rc)
goto error;
@@ -3636,7 +3627,6 @@ out:
return rc;
error:
- dfs_put_root_smb_sessions(&mnt_ctx.dfs_ses_list);
cifs_mount_put_conns(&mnt_ctx);
return rc;
}
@@ -3651,6 +3641,18 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
goto error;
rc = cifs_mount_get_tcon(&mnt_ctx);
+ if (!rc) {
+ /*
+ * Prevent superblock from being created with any missing
+ * connections.
+ */
+ if (WARN_ON(!mnt_ctx.server))
+ rc = -EHOSTDOWN;
+ else if (WARN_ON(!mnt_ctx.ses))
+ rc = -EACCES;
+ else if (WARN_ON(!mnt_ctx.tcon))
+ rc = -ENOENT;
+ }
if (rc)
goto error;
@@ -3988,13 +3990,14 @@ cifs_set_vol_auth(struct smb3_fs_context *ctx, struct cifs_ses *ses)
}
static struct cifs_tcon *
-cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
+__cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
{
int rc;
struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
struct cifs_ses *ses;
struct cifs_tcon *tcon = NULL;
struct smb3_fs_context *ctx;
+ char *origin_fullpath = NULL;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (ctx == NULL)
@@ -4018,6 +4021,7 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
ctx->sign = master_tcon->ses->sign;
ctx->seal = master_tcon->seal;
ctx->witness = master_tcon->use_witness;
+ ctx->dfs_root_ses = master_tcon->ses->dfs_root_ses;
rc = cifs_set_vol_auth(ctx, master_tcon->ses);
if (rc) {
@@ -4037,12 +4041,39 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
goto out;
}
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ spin_lock(&master_tcon->tc_lock);
+ if (master_tcon->origin_fullpath) {
+ spin_unlock(&master_tcon->tc_lock);
+ origin_fullpath = dfs_get_path(cifs_sb, cifs_sb->ctx->source);
+ if (IS_ERR(origin_fullpath)) {
+ tcon = ERR_CAST(origin_fullpath);
+ origin_fullpath = NULL;
+ cifs_put_smb_ses(ses);
+ goto out;
+ }
+ } else {
+ spin_unlock(&master_tcon->tc_lock);
+ }
+#endif
+
tcon = cifs_get_tcon(ses, ctx);
if (IS_ERR(tcon)) {
cifs_put_smb_ses(ses);
goto out;
}
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ if (origin_fullpath) {
+ spin_lock(&tcon->tc_lock);
+ tcon->origin_fullpath = origin_fullpath;
+ spin_unlock(&tcon->tc_lock);
+ origin_fullpath = NULL;
+ queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
+ dfs_cache_get_ttl() * HZ);
+ }
+#endif
+
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
if (cap_unix(ses))
reset_cifs_unix_caps(0, tcon, NULL, ctx);
@@ -4051,11 +4082,23 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
out:
kfree(ctx->username);
kfree_sensitive(ctx->password);
+ kfree(origin_fullpath);
kfree(ctx);
return tcon;
}
+static struct cifs_tcon *
+cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
+{
+ struct cifs_tcon *ret;
+
+ cifs_mount_lock();
+ ret = __cifs_construct_tcon(cifs_sb, fsuid);
+ cifs_mount_unlock();
+ return ret;
+}
+
struct cifs_tcon *
cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
{
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-29 14:20:56 +0000