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smb: client: handle DFS tcons in cifs_construct_tcon()

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The tcons created by cifs_construct_tcon() on multiuser mounts must
also be able to failover and refresh DFS referrals, so set the
appropriate fields in order to get a full DFS tcon.  They could be
shared among different superblocks later, too.

Cc: stable@vger.kernel.org # 6.4+
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202404021518.3Xu2VU4s-lkp@intel.com/
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Paulo Alcantara 2024-04-01 22:44:08 -03:00 committed by Steve French
parent 0a05ad21d7
commit 4a5ba0e0bf
1 changed files with 30 additions and 0 deletions
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30
fs/smb/client/connect.c
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@ -3995,6 +3995,7 @@ cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
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 +4019,7 @@ 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 +4039,39 @@ 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);
@ -4051,6 +4080,7 @@ 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;