smb: client: use actual path when queryfs

commit a421e3fe0e6abe27395078f4f0cec5daf466caea upstream.

Due to server permission control, the client does not have access to
the shared root directory, but can access subdirectories normally, so
users usually mount the shared subdirectories directly. In this case,
queryfs should use the actual path instead of the root directory to
avoid the call returning an error (EACCES).

Signed-off-by: wangrong <wangrong@uniontech.com>
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/smb/client/cifsfs.c b/fs/smb/client/cifsfs.c
index 2a2523c93944de68e82528f485de5ae19d7d23d8..33e2860010158c9c0ad8a3e4f3b92bf7a1acaa11 100644 (file)
--- a/fs/smb/client/cifsfs.c
+++ b/fs/smb/client/cifsfs.c
@@ -313,8 +313,17 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
        struct TCP_Server_Info *server = tcon->ses->server;
        unsigned int xid;
        int rc = 0;
+       const char *full_path;
+       void *page;
 
        xid = get_xid();
+       page = alloc_dentry_path();
+
+       full_path = build_path_from_dentry(dentry, page);
+       if (IS_ERR(full_path)) {
+               rc = PTR_ERR(full_path);
+               goto statfs_out;
+       }
 
        if (le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength) > 0)
                buf->f_namelen =
@@ -330,8 +339,10 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
        buf->f_ffree = 0;       /* unlimited */
 
        if (server->ops->queryfs)
-               rc = server->ops->queryfs(xid, tcon, cifs_sb, buf);
+               rc = server->ops->queryfs(xid, tcon, full_path, cifs_sb, buf);
 
+statfs_out:
+       free_dentry_path(page);
        free_xid(xid);
        return rc;
 }

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h
index 9eae8649f90c382394b0bdd3bb1678d5ede2ca0b..59f649da5fdde7f3456cdd0439f7d1b2f2fe1ca8 100644 (file)
--- a/fs/smb/client/cifsglob.h
+++ b/fs/smb/client/cifsglob.h
@@ -482,7 +482,7 @@ struct smb_version_operations {
                        __u16 net_fid, struct cifsInodeInfo *cifs_inode);
        /* query remote filesystem */
        int (*queryfs)(const unsigned int, struct cifs_tcon *,
-                      struct cifs_sb_info *, struct kstatfs *);
+                      const char *, struct cifs_sb_info *, struct kstatfs *);
        /* send mandatory brlock to the server */
        int (*mand_lock)(const unsigned int, struct cifsFileInfo *, __u64,
                         __u64, __u32, int, int, bool);

diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c
index e1f2feb56f45f6ac10ab50875689638da6b7712e..8c03250d85ae0c4d5bc1738143fb88989e213381 100644 (file)
--- a/fs/smb/client/smb1ops.c
+++ b/fs/smb/client/smb1ops.c
@@ -909,7 +909,7 @@ cifs_oplock_response(struct cifs_tcon *tcon, __u64 persistent_fid,
 
 static int
 cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
-            struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
+            const char *path, struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
 {
        int rc = -EOPNOTSUPP;
 

diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
index e6540072ffb0e1ec63d1fc36122fc1e29f6064c9..2ba43327d3f4c84800488642999019dde4bf513a 100644 (file)
--- a/fs/smb/client/smb2ops.c
+++ b/fs/smb/client/smb2ops.c
@@ -2836,7 +2836,7 @@ out_free_path:
 
 static int
 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
-            struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
+            const char *path, struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
 {
        struct smb2_query_info_rsp *rsp;
        struct smb2_fs_full_size_info *info = NULL;
@@ -2845,7 +2845,7 @@ smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
        int rc;
 
 
-       rc = smb2_query_info_compound(xid, tcon, "",
+       rc = smb2_query_info_compound(xid, tcon, path,
                                      FILE_READ_ATTRIBUTES,
                                      FS_FULL_SIZE_INFORMATION,
                                      SMB2_O_INFO_FILESYSTEM,
@@ -2873,28 +2873,33 @@ qfs_exit:
 
 static int
 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
-              struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
+              const char *path, struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
 {
        int rc;
-       __le16 srch_path = 0; /* Null - open root of share */
+       __le16 *utf16_path = NULL;
        u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
        struct cifs_open_parms oparms;
        struct cifs_fid fid;
 
        if (!tcon->posix_extensions)
-               return smb2_queryfs(xid, tcon, cifs_sb, buf);
+               return smb2_queryfs(xid, tcon, path, cifs_sb, buf);
 
        oparms = (struct cifs_open_parms) {
                .tcon = tcon,
-               .path = "",
+               .path = path,
                .desired_access = FILE_READ_ATTRIBUTES,
                .disposition = FILE_OPEN,
                .create_options = cifs_create_options(cifs_sb, 0),
                .fid = &fid,
        };
 
-       rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
+       utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
+       if (utf16_path == NULL)
+               return -ENOMEM;
+
+       rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
                       NULL, NULL);
+       kfree(utf16_path);
        if (rc)
                return rc;