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-rw-r--r--fs/smb/client/cifsglob.h3
-rw-r--r--fs/smb/client/cifsproto.h12
-rw-r--r--fs/smb/client/connect.c41
-rw-r--r--fs/smb/client/dfs.c73
-rw-r--r--fs/smb/client/dfs.h42
-rw-r--r--fs/smb/client/dfs_cache.c3
-rw-r--r--fs/smb/client/fs_context.h1
-rw-r--r--fs/smb/client/misc.c3
-rw-r--r--fs/smb/client/namespace.c2
9 files changed, 94 insertions, 86 deletions
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index a71a988a92f9..15571cf0ba63 100644
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -821,6 +821,7 @@ struct TCP_Server_Info {
* format: \\HOST\SHARE[\OPTIONAL PATH]
*/
char *leaf_fullpath;
+ bool dfs_conn:1;
};
static inline bool is_smb1(struct TCP_Server_Info *server)
@@ -1059,6 +1060,7 @@ struct cifs_ses {
struct list_head smb_ses_list;
struct list_head rlist; /* reconnect list */
struct list_head tcon_list;
+ struct list_head dlist; /* dfs list */
struct cifs_tcon *tcon_ipc;
spinlock_t ses_lock; /* protect anything here that is not protected */
struct mutex session_mutex;
@@ -1287,6 +1289,7 @@ struct cifs_tcon {
/* BB add field for back pointer to sb struct(s)? */
#ifdef CONFIG_CIFS_DFS_UPCALL
struct delayed_work dfs_cache_work;
+ struct list_head dfs_ses_list;
#endif
struct delayed_work query_interfaces; /* query interfaces workqueue job */
char *origin_fullpath; /* canonical copy of smb3_fs_context::source */
diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h
index c69e3f48a60c..68c716e6261b 100644
--- a/fs/smb/client/cifsproto.h
+++ b/fs/smb/client/cifsproto.h
@@ -724,15 +724,9 @@ static inline int cifs_create_options(struct cifs_sb_info *cifs_sb, int options)
int cifs_wait_for_server_reconnect(struct TCP_Server_Info *server, bool retry);
-/* Put references of @ses and its children */
static inline void cifs_put_smb_ses(struct cifs_ses *ses)
{
- struct cifs_ses *next;
-
- do {
- next = ses->dfs_root_ses;
- __cifs_put_smb_ses(ses);
- } while ((ses = next));
+ __cifs_put_smb_ses(ses);
}
/* Get an active reference of @ses and its children.
@@ -746,9 +740,7 @@ static inline void cifs_put_smb_ses(struct cifs_ses *ses)
static inline void cifs_smb_ses_inc_refcount(struct cifs_ses *ses)
{
lockdep_assert_held(&cifs_tcp_ses_lock);
-
- for (; ses; ses = ses->dfs_root_ses)
- ses->ses_count++;
+ ses->ses_count++;
}
static inline bool dfs_src_pathname_equal(const char *s1, const char *s2)
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index 08a41c7aaf72..76f02739dda5 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -1530,6 +1530,9 @@ static int match_server(struct TCP_Server_Info *server,
if (server->nosharesock)
return 0;
+ if (!match_super && (ctx->dfs_conn || server->dfs_conn))
+ return 0;
+
/* If multidialect negotiation see if existing sessions match one */
if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
if (server->vals->protocol_id < SMB30_PROT_ID)
@@ -1723,6 +1726,7 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx,
if (ctx->nosharesock)
tcp_ses->nosharesock = true;
+ tcp_ses->dfs_conn = ctx->dfs_conn;
tcp_ses->ops = ctx->ops;
tcp_ses->vals = ctx->vals;
@@ -1873,13 +1877,15 @@ out_err:
}
/* this function must be called with ses_lock and chan_lock held */
-static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
+static int match_session(struct cifs_ses *ses,
+ struct smb3_fs_context *ctx,
+ bool match_super)
{
if (ctx->sectype != Unspecified &&
ctx->sectype != ses->sectype)
return 0;
- if (ctx->dfs_root_ses != ses->dfs_root_ses)
+ if (!match_super && ctx->dfs_root_ses != ses->dfs_root_ses)
return 0;
/*
@@ -1998,7 +2004,7 @@ cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx)
continue;
}
spin_lock(&ses->chan_lock);
- if (match_session(ses, ctx)) {
+ if (match_session(ses, ctx, false)) {
spin_unlock(&ses->chan_lock);
spin_unlock(&ses->ses_lock);
ret = ses;
@@ -2382,8 +2388,6 @@ 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;
list_add(&ses->smb_ses_list, &server->smb_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
@@ -2458,6 +2462,7 @@ cifs_put_tcon(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace)
{
unsigned int xid;
struct cifs_ses *ses;
+ LIST_HEAD(ses_list);
/*
* IPC tcon share the lifetime of their session and are
@@ -2482,6 +2487,9 @@ cifs_put_tcon(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace)
list_del_init(&tcon->tcon_list);
tcon->status = TID_EXITING;
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ list_replace_init(&tcon->dfs_ses_list, &ses_list);
+#endif
spin_unlock(&tcon->tc_lock);
spin_unlock(&cifs_tcp_ses_lock);
@@ -2509,6 +2517,9 @@ cifs_put_tcon(struct cifs_tcon *tcon, enum smb3_tcon_ref_trace trace)
cifs_fscache_release_super_cookie(tcon);
tconInfoFree(tcon, netfs_trace_tcon_ref_free);
cifs_put_smb_ses(ses);
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ dfs_put_root_smb_sessions(&ses_list);
+#endif
}
/**
@@ -2892,7 +2903,7 @@ cifs_match_super(struct super_block *sb, void *data)
spin_lock(&ses->chan_lock);
spin_lock(&tcon->tc_lock);
if (!match_server(tcp_srv, ctx, true) ||
- !match_session(ses, ctx) ||
+ !match_session(ses, ctx, true) ||
!match_tcon(tcon, ctx) ||
!match_prepath(sb, tcon, mnt_data)) {
rc = 0;
@@ -3623,13 +3634,12 @@ out:
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
{
struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
- bool isdfs;
int rc;
- rc = dfs_mount_share(&mnt_ctx, &isdfs);
+ rc = dfs_mount_share(&mnt_ctx);
if (rc)
goto error;
- if (!isdfs)
+ if (!ctx->dfs_conn)
goto out;
/*
@@ -4034,7 +4044,7 @@ 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);
@@ -4132,17 +4142,6 @@ out:
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)
{
diff --git a/fs/smb/client/dfs.c b/fs/smb/client/dfs.c
index 3ec965547e3d..3f6077c68d68 100644
--- a/fs/smb/client/dfs.c
+++ b/fs/smb/client/dfs.c
@@ -69,7 +69,7 @@ static int get_session(struct cifs_mount_ctx *mnt_ctx, const char *full_path)
* Get an active reference of @ses so that next call to cifs_put_tcon() won't
* release it as any new DFS referrals must go through its IPC tcon.
*/
-static void add_root_smb_session(struct cifs_mount_ctx *mnt_ctx)
+static void set_root_smb_session(struct cifs_mount_ctx *mnt_ctx)
{
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
struct cifs_ses *ses = mnt_ctx->ses;
@@ -95,7 +95,7 @@ static inline int parse_dfs_target(struct smb3_fs_context *ctx,
return rc;
}
-static int set_ref_paths(struct cifs_mount_ctx *mnt_ctx,
+static int setup_dfs_ref(struct cifs_mount_ctx *mnt_ctx,
struct dfs_info3_param *tgt,
struct dfs_ref_walk *rw)
{
@@ -120,6 +120,7 @@ static int set_ref_paths(struct cifs_mount_ctx *mnt_ctx,
}
ref_walk_path(rw) = ref_path;
ref_walk_fpath(rw) = full_path;
+ ref_walk_ses(rw) = ctx->dfs_root_ses;
return 0;
}
@@ -128,11 +129,11 @@ static int __dfs_referral_walk(struct cifs_mount_ctx *mnt_ctx,
{
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
struct dfs_info3_param tgt = {};
- bool is_refsrv;
int rc = -ENOENT;
again:
do {
+ ctx->dfs_root_ses = ref_walk_ses(rw);
if (ref_walk_empty(rw)) {
rc = dfs_get_referral(mnt_ctx, ref_walk_path(rw) + 1,
NULL, ref_walk_tl(rw));
@@ -158,10 +159,7 @@ again:
if (rc)
continue;
- is_refsrv = tgt.server_type == DFS_TYPE_ROOT ||
- DFS_INTERLINK(tgt.flags);
ref_walk_set_tgt_hint(rw);
-
if (tgt.flags & DFSREF_STORAGE_SERVER) {
rc = cifs_mount_get_tcon(mnt_ctx);
if (!rc)
@@ -172,12 +170,10 @@ again:
continue;
}
- if (is_refsrv)
- add_root_smb_session(mnt_ctx);
-
+ set_root_smb_session(mnt_ctx);
rc = ref_walk_advance(rw);
if (!rc) {
- rc = set_ref_paths(mnt_ctx, &tgt, rw);
+ rc = setup_dfs_ref(mnt_ctx, &tgt, rw);
if (!rc) {
rc = -EREMOTE;
goto again;
@@ -193,20 +189,22 @@ out:
return rc;
}
-static int dfs_referral_walk(struct cifs_mount_ctx *mnt_ctx)
+static int dfs_referral_walk(struct cifs_mount_ctx *mnt_ctx,
+ struct dfs_ref_walk **rw)
{
- struct dfs_ref_walk *rw;
int rc;
- rw = ref_walk_alloc();
- if (IS_ERR(rw))
- return PTR_ERR(rw);
+ *rw = ref_walk_alloc();
+ if (IS_ERR(*rw)) {
+ rc = PTR_ERR(*rw);
+ *rw = NULL;
+ return rc;
+ }
- ref_walk_init(rw);
- rc = set_ref_paths(mnt_ctx, NULL, rw);
+ ref_walk_init(*rw);
+ rc = setup_dfs_ref(mnt_ctx, NULL, *rw);
if (!rc)
- rc = __dfs_referral_walk(mnt_ctx, rw);
- ref_walk_free(rw);
+ rc = __dfs_referral_walk(mnt_ctx, *rw);
return rc;
}
@@ -214,16 +212,16 @@ static int __dfs_mount_share(struct cifs_mount_ctx *mnt_ctx)
{
struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
+ struct dfs_ref_walk *rw = NULL;
struct cifs_tcon *tcon;
char *origin_fullpath;
- bool new_tcon = true;
int rc;
origin_fullpath = dfs_get_path(cifs_sb, ctx->source);
if (IS_ERR(origin_fullpath))
return PTR_ERR(origin_fullpath);
- rc = dfs_referral_walk(mnt_ctx);
+ rc = dfs_referral_walk(mnt_ctx, &rw);
if (!rc) {
/*
* Prevent superblock from being created with any missing
@@ -241,21 +239,16 @@ static int __dfs_mount_share(struct cifs_mount_ctx *mnt_ctx)
tcon = mnt_ctx->tcon;
spin_lock(&tcon->tc_lock);
- if (!tcon->origin_fullpath) {
- tcon->origin_fullpath = origin_fullpath;
- origin_fullpath = NULL;
- } else {
- new_tcon = false;
- }
+ tcon->origin_fullpath = origin_fullpath;
+ origin_fullpath = NULL;
+ ref_walk_set_tcon(rw, tcon);
spin_unlock(&tcon->tc_lock);
-
- if (new_tcon) {
- queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
- dfs_cache_get_ttl() * HZ);
- }
+ queue_delayed_work(dfscache_wq, &tcon->dfs_cache_work,
+ dfs_cache_get_ttl() * HZ);
out:
kfree(origin_fullpath);
+ ref_walk_free(rw);
return rc;
}
@@ -279,7 +272,7 @@ static int update_fs_context_dstaddr(struct smb3_fs_context *ctx)
return rc;
}
-int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
+int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx)
{
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
bool nodfs = ctx->nodfs;
@@ -289,7 +282,6 @@ int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
if (rc)
return rc;
- *isdfs = false;
rc = get_session(mnt_ctx, NULL);
if (rc)
return rc;
@@ -317,10 +309,15 @@ int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs)
return rc;
}
- *isdfs = true;
- add_root_smb_session(mnt_ctx);
- rc = __dfs_mount_share(mnt_ctx);
- dfs_put_root_smb_sessions(mnt_ctx);
+ if (!ctx->dfs_conn) {
+ ctx->dfs_conn = true;
+ cifs_mount_put_conns(mnt_ctx);
+ rc = get_session(mnt_ctx, NULL);
+ }
+ if (!rc) {
+ set_root_smb_session(mnt_ctx);
+ rc = __dfs_mount_share(mnt_ctx);
+ }
return rc;
}
diff --git a/fs/smb/client/dfs.h b/fs/smb/client/dfs.h
index e5c4dcf83750..1aa2bc65b3bc 100644
--- a/fs/smb/client/dfs.h
+++ b/fs/smb/client/dfs.h
@@ -19,6 +19,7 @@
struct dfs_ref {
char *path;
char *full_path;
+ struct cifs_ses *ses;
struct dfs_cache_tgt_list tl;
struct dfs_cache_tgt_iterator *tit;
};
@@ -38,6 +39,7 @@ struct dfs_ref_walk {
#define ref_walk_path(w) (ref_walk_cur(w)->path)
#define ref_walk_fpath(w) (ref_walk_cur(w)->full_path)
#define ref_walk_tl(w) (&ref_walk_cur(w)->tl)
+#define ref_walk_ses(w) (ref_walk_cur(w)->ses)
static inline struct dfs_ref_walk *ref_walk_alloc(void)
{
@@ -60,14 +62,19 @@ static inline void __ref_walk_free(struct dfs_ref *ref)
kfree(ref->path);
kfree(ref->full_path);
dfs_cache_free_tgts(&ref->tl);
+ if (ref->ses)
+ cifs_put_smb_ses(ref->ses);
memset(ref, 0, sizeof(*ref));
}
static inline void ref_walk_free(struct dfs_ref_walk *rw)
{
- struct dfs_ref *ref = ref_walk_start(rw);
+ struct dfs_ref *ref;
- for (; ref <= ref_walk_end(rw); ref++)
+ if (!rw)
+ return;
+
+ for (ref = ref_walk_start(rw); ref <= ref_walk_end(rw); ref++)
__ref_walk_free(ref);
kfree(rw);
}
@@ -116,9 +123,22 @@ static inline void ref_walk_set_tgt_hint(struct dfs_ref_walk *rw)
ref_walk_tit(rw));
}
+static inline void ref_walk_set_tcon(struct dfs_ref_walk *rw,
+ struct cifs_tcon *tcon)
+{
+ struct dfs_ref *ref = ref_walk_start(rw);
+
+ for (; ref <= ref_walk_cur(rw); ref++) {
+ if (WARN_ON_ONCE(!ref->ses))
+ continue;
+ list_add(&ref->ses->dlist, &tcon->dfs_ses_list);
+ ref->ses = NULL;
+ }
+}
+
int dfs_parse_target_referral(const char *full_path, const struct dfs_info3_param *ref,
struct smb3_fs_context *ctx);
-int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx, bool *isdfs);
+int dfs_mount_share(struct cifs_mount_ctx *mnt_ctx);
static inline char *dfs_get_path(struct cifs_sb_info *cifs_sb, const char *path)
{
@@ -142,20 +162,14 @@ static inline int dfs_get_referral(struct cifs_mount_ctx *mnt_ctx, const char *p
* references of all DFS root sessions that were used across the mount process
* in dfs_mount_share().
*/
-static inline void dfs_put_root_smb_sessions(struct cifs_mount_ctx *mnt_ctx)
+static inline void dfs_put_root_smb_sessions(struct list_head *head)
{
- const struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
- struct cifs_ses *ses = ctx->dfs_root_ses;
- struct cifs_ses *cur;
-
- if (!ses)
- return;
+ struct cifs_ses *ses, *n;
- for (cur = ses; cur; cur = cur->dfs_root_ses) {
- if (cur->dfs_root_ses)
- cifs_put_smb_ses(cur->dfs_root_ses);
+ list_for_each_entry_safe(ses, n, head, dlist) {
+ list_del_init(&ses->dlist);
+ cifs_put_smb_ses(ses);
}
- cifs_put_smb_ses(ses);
}
#endif /* _CIFS_DFS_H */
diff --git a/fs/smb/client/dfs_cache.c b/fs/smb/client/dfs_cache.c
index e496dbf8c622..110f03df012a 100644
--- a/fs/smb/client/dfs_cache.c
+++ b/fs/smb/client/dfs_cache.c
@@ -1334,9 +1334,8 @@ void dfs_cache_refresh(struct work_struct *work)
struct cifs_ses *ses;
tcon = container_of(work, struct cifs_tcon, dfs_cache_work.work);
- ses = tcon->ses->dfs_root_ses;
- for (; ses; ses = ses->dfs_root_ses)
+ list_for_each_entry(ses, &tcon->dfs_ses_list, dlist)
refresh_ses_referral(ses);
refresh_tcon_referral(tcon, false);
diff --git a/fs/smb/client/fs_context.h b/fs/smb/client/fs_context.h
index cf577ec0dd0a..69f9d938b336 100644
--- a/fs/smb/client/fs_context.h
+++ b/fs/smb/client/fs_context.h
@@ -284,6 +284,7 @@ struct smb3_fs_context {
struct cifs_ses *dfs_root_ses;
bool dfs_automount:1; /* set for dfs automount only */
enum cifs_reparse_type reparse_type;
+ bool dfs_conn:1; /* set for dfs mounts */
};
extern const struct fs_parameter_spec smb3_fs_parameters[];
diff --git a/fs/smb/client/misc.c b/fs/smb/client/misc.c
index dab526191b07..47b861517bed 100644
--- a/fs/smb/client/misc.c
+++ b/fs/smb/client/misc.c
@@ -145,6 +145,9 @@ tcon_info_alloc(bool dir_leases_enabled, enum smb3_tcon_ref_trace trace)
mutex_init(&ret_buf->fscache_lock);
#endif
trace_smb3_tcon_ref(ret_buf->debug_id, ret_buf->tc_count, trace);
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ INIT_LIST_HEAD(&ret_buf->dfs_ses_list);
+#endif
return ret_buf;
}
diff --git a/fs/smb/client/namespace.c b/fs/smb/client/namespace.c
index 4a517b280f2b..0f788031b740 100644
--- a/fs/smb/client/namespace.c
+++ b/fs/smb/client/namespace.c
@@ -240,7 +240,7 @@ static struct vfsmount *cifs_do_automount(struct path *path)
ctx->source = NULL;
goto out;
}
- ctx->dfs_automount = is_dfs_mount(mntpt);
+ ctx->dfs_automount = ctx->dfs_conn = is_dfs_mount(mntpt);
cifs_dbg(FYI, "%s: ctx: source=%s UNC=%s prepath=%s dfs_automount=%d\n",
__func__, ctx->source, ctx->UNC, ctx->prepath, ctx->dfs_automount);
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-25 00:13:23 +0000