CIFS: Fix mounts if the client is low on credits
If the server doesn't grant us at least 3 credits during the mount we won't be able to complete it because query path info operation requires 3 credits. Use the cached file handle if possible to allow the mount to succeed. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
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@ -293,6 +293,8 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
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int rc;
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struct smb2_file_all_info *smb2_data;
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__u32 create_options = 0;
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struct cifs_fid fid;
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bool no_cached_open = tcon->nohandlecache;
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*adjust_tz = false;
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*symlink = false;
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@ -301,6 +303,21 @@ smb2_query_path_info(const unsigned int xid, struct cifs_tcon *tcon,
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GFP_KERNEL);
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if (smb2_data == NULL)
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return -ENOMEM;
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/* If it is a root and its handle is cached then use it */
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if (!strlen(full_path) && !no_cached_open) {
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rc = open_shroot(xid, tcon, &fid);
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if (rc)
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goto out;
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rc = SMB2_query_info(xid, tcon, fid.persistent_fid,
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fid.volatile_fid, smb2_data);
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close_shroot(&tcon->crfid);
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if (rc)
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goto out;
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move_smb2_info_to_cifs(data, smb2_data);
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goto out;
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}
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if (backup_cred(cifs_sb))
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create_options |= CREATE_OPEN_BACKUP_INTENT;
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